This file contains GRB 071112 "A", "B", and "C". //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7057 SUBJECT: GRB 071112: Swift detection of a possible burst DATE: 07/11/12 15:21:07 GMT FROM: Scott Barthelmy at NASA/GSFC G. Stratta (ASDC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), G. Cusumano (INAF-IASFPA), C. Gronwall (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), C. B. Markwardt (CRESST/GSFC/UMD), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), A. M. Parsons (GSFC), P. Romano (Univ. Bicocca & INAF-OAB), B. Sbarufatti (INAF-IASFPA), T. N. Ukwatta (GSFC/GWU), D. E. Vanden Berk (PSU) and S. D. Vergani (DIAS-DCU) report on behalf of the Swift Team: At 14:51:39 UT, the Swift Burst Alert Telescope (BAT) triggered and located possible GRB 071112 (trigger=296491). Swift slewed immediately. The BAT on-board calculated location is RA, Dec 297.442, -50.338 which is RA(J2000) = 19h 49m 46s Dec(J2000) = -50d 20' 15" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a very weak peak at T+0 (this was a 1-sec rate trigger) and then a 10-sec peak at ~T+40 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~T+40 sec after the trigger. The XRT began observing the field at 14:53:22 UT, 103 seconds after the BAT trigger. XRT centroided on-board on a CCD hot column, so the position sent out in our first, automated XRT Position Notice is incorrect. From preliminary ground analysis of an exposure of 1153 s of Photon Counting mode data, XRT did not find any X-ray source within the BAT error circle. UVOT took a finding chart exposure of nominal 100 seconds with the White (160-650 nm) filter starting 112 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. Image catalog data are not available at this time. The 8'x8' region for the list of sources generated on-board covers 100% of the BAT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for extinction. Burst Advocate for this burst is G. Stratta (giulia.stratta AT asdc.asi.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7058 SUBJECT: GRB 071112B: Swift detection of a short hard burst DATE: 07/11/12 18:34:08 GMT FROM: Scott Barthelmy at NASA/GSFC M. Perri (ASDC), S. D. Barthelmy (GSFC), J. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), C. B. Markwardt (CRESST/GSFC/UMD), S. Mateos (U Leicester), D. M. Palmer (LANL), A. M. Parsons (GSFC), P. Romano (Univ. Bicocca & INAF-OAB), R. L. C. Starling (U Leicester), G. Stratta (ASDC), T. N. Ukwatta (GSFC/GWU), D. E. Vanden Berk (PSU) and S. D. Vergani (DIAS-DCU) report on behalf of the Swift Team: At 18:23:31 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 071112B (trigger=296503). Swift did not slew because of the Earth observing constraint. Swift will slew at T+33 min. The BAT on-board calculated location is RA, Dec 260.305, -80.884 which is RA(J2000) = 17h 21m 13s Dec(J2000) = -80d 53' 02" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a double spike structure with a duration of about 1 sec. The peak count rate was ~4500 counts/sec (15-350 keV), at ~0 sec after the trigger. Because of an Earth limb constraint, the spacecraft did not slew promptly to the BAT position, and so there are no immediate XRT or UVOT data products to analyze. Burst Advocate for this burst is M. Perri (perri AT asdc.asi.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7059 SUBJECT: GRB 071112C: Swift detection of a burst with an optical counterpart DATE: 07/11/12 18:50:05 GMT FROM: Scott Barthelmy at NASA/GSFC M. Perri (ASDC), G. Stratta (ASDC), S. D. Barthelmy (GSFC), P. J. Brown (PSU), J. R. Cummings (NASA/UMBC), G. Cusumano (INAF-IASFPA), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), C. B. Markwardt (CRESST/GSFC/UMD), P. T. O'Brien (U Leicester), J. P. Osborne (U Leicester), C. Pagani (PSU), D. M. Palmer (LANL), A. M. Parsons (GSFC), J. L. Racusin (PSU), P. Romano (Univ. Bicocca & INAF-OAB), R. L. C. Starling (U Leicester), T. N. Ukwatta (GSFC/GWU) and D. E. Vanden Berk (PSU) report on behalf of the Swift Team: At 18:32:57 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 071112C (trigger=296504). Swift slewed immediately to this burst. The BAT on-board calculated location is RA, Dec 39.220, +28.381 which is RA(J2000) = 02h 36m 53s Dec(J2000) = +28d 22' 50" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). We do not know anything about the lightcurve from this "C" burst, because it came so closely after the previous ("B") burst that the on-board script was still running. The XRT began observing the field at 18:34:21 UT, 84 seconds after the BAT trigger. XRT found a fading uncatalogued X-ray source located at RA, Dec 39.2122, +28.3708 which is RA(J2000) = 02h 36m 50.9s Dec(J2000) = +28d 22' 14.9" with an uncertainty of 4.1 arcseconds (radius, 90% containment). This location is 44 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 1.3e-09 erg/cm2/s (0.2-10 keV). UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 92 seconds after the BAT trigger. There is a fading candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 02:36:50.93 = 39.2122 DEC(J2000) = +28:22:16.7 = 28.3713 with a 1-sigma error radius of about 0.5 arc sec. This position is 1.8 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.3 with a 1-sigma error of about 0.5 mag. No correction has been made for extinction. Burst Advocate for this burst is G. Stratta (giulia.stratta AT asdc.asi.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7060 SUBJECT: GRB 071112B: ROTSE-III Rapid Optical Limits DATE: 07/11/12 19:18:52 GMT FROM: Eli Rykoff at UCSB E.S. Rykoff (UCSB), F. Yuan (U Mich), W. Rujopakarn (Steward), report on behalf of the ROTSE collaboration: ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia, responded to the short/hard GRB 071112B (Swift trigger 296503; Perri et al., GCN 7058), producing images beginning 6.8 s after the GCN notice time. An automated response took the first image at 18:23:55.8 UT, 24.3 s after the burst, under fair conditions. We took 10 5-sec, and 10 20-sec exposures before ROTSE-IIIc repointed at Swift trigger 296504 (GRB071111C). These unfiltered images are calibrated relative to USNO A2.0 (R). Comparison to the DSS (second epoch) reveals no new sources within the 3-sigma Swift/BAT error circle, for both single images and coadding into sets of 10. Individual images have limiting magnitudes ranging from 15.3-16.3; we set the following specific limits. start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd? -------------------------------------------------------------------- 18:23:55.8 18:24:00.8 5 15.5 24.3 N 18:23:55.8 18:25:45.1 109 16.6 24.3 Y 18:25:53.0 18:31:02.2 309 17.3 141.5 Y //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7061 SUBJECT: GRB 071112C: ROTSE-III Confirmation of Optical Counterpart DATE: 07/11/12 19:43:56 GMT FROM: Fang Yuan at ROTSE F. Yuan (U Mich), E.S. Rykoff (UCSB), W. Rujopakarn (Steward), H. Swan (U Mich), report on behalf of the ROTSE collaboration: ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia, responded to GRB 071112C (Swift trigger 296504; Perri, M. et. al., GCN 7059). The first image was at 18:34:01.8 UT, 64.3 s after the burst (10.8 s after the GCN notice time). We detect the OT reported in GCN 7059. The magnitude of the OT was roughly constant for the first few hundred seconds and then faded rapidly afterward. Further analysis is ongoing. The unfiltered images are calibrated relative to USNO B1.0. Midtime UT mag magerror mlim(of image) -------------------------------------------------------------------- 18:34:56.4 17.3 0.2 17.1 18:38:52.2 17.1 0.1 18.0 18:47:46.5 18.9 0.3 18.4 A jpeg image of the OT (object 82) is available at http://www.rotse.net/images/gsb296504_3c011-020_key.jpg Continuing observations are in progress. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7062 SUBJECT: GRB 071112C: Optical and NIR afterglows observed with KANATA DATE: 07/11/12 20:07:47 GMT FROM: Makoto Uemura at Hiroshima U M. Uemura, M. Sasada, A. Arai, and T. Uehara (Hiroshima Univ.), report on behalf of the KANATA GRB team: We performed optical-NIR observations of the field of GRB 071112C (GCN Circ. 7059) with TRISPEC attached to the "KANATA" 1.5-m telescope. We found a fading object at the position of the optical afterglow detected with UVOT. Our preliminary results are below: time(UT) mag. exposure_time Nov. 2007 (sec) 12.77880 17.76 +/- 0.14 V 30sec * 10 12.77911 16.39 +/- 0.22 J 25sec * 9 12.78674 18.66 +/- 0.20 V 123sec * 5 12.78672 17.16 +/- 0.17 J 120sec * 5 Comparison star: V-band: GSC2.3 02:36:55.72 +28:21:03.7 V=14.15 J-band: 2MASS 02:36:55.72 +28:21:03.7 J=12.674 The large errors of magnitudes are due to the rapidly fading trend of the afterglow. Further observation and analysis are ongoing. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7063 SUBJECT: GRB071112C Xinglong_TNT_and_EST_afterglow observations DATE: 07/11/12 20:12:17 GMT FROM: L.P. Xin at NAOC X.F.Wang, L.P. Xin, M. Zhai, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng, J. Wang, Y. Urata and W.K. Zheng on behalf of EAFON report: We have imaged the field of GRB071112C (M. Perri et al GCN7059 ) using the TNT 0.8 telescope and EST 1.0 telescope at Xinglong observatory.A series of white-band ,R-band and V-band images were obtained from 18:34:51, 113s after the burst. In our 20*20s white-band combined image,   we detected afterglow  as reported (M. Perri et al GCN 7059, F. Yuan GDN7061). The estimated brightness derived from USNO-B1.0 R2mag was R2=17.62+/-0.06 at 38.8s after the burst(mean time of the stacked image). Further observations are going. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7065 SUBJECT: GRB 071112C: TAROT Calern observatory optical observations DATE: 07/11/12 21:35:14 GMT FROM: Alain Klotz at CESR-CNRS Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report: We imaged the field of GRB 071112 detected by SWIFT (trigger 296504) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 65.0s after the GRB trigger (10.7s after the notice). The elevation of the field increased from from 38 degrees above horizon and weather conditions were fully cloudy until 90 minutes after the GRB. We co-added a series of exposures taken between 98 and 155 min. We detect the OT reported by Perri et al. (GCNC 7059) near the limiting magnitude: t_grb+98 min. to t_grb+155 min. : R = 20.1 +/- 0.3 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7066 SUBJECT: GRB 071112C: RTT150 optical observations DATE: 07/11/12 22:09:44 GMT FROM: Rodion Burenin at IKI, Moscow R. Burenin, (IKI), I. Khamitov (TUG), M. Pavlinsky, R. Sunyaev (IKI), Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.), I. Bikmaev, N. Sakhibullin (KSU/AST) report: The optical counterpart of GRB 071112C (GCN 7059) was observed with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey), under poor observational conditions. First image was taken 16.7 min after the burst. Assuming R=16.0 and B=16.76 magnitudes for nearby star USNO-B1.0 1183-0043866 we estimated the following magnitudes for the OT: 18:49:39 UT, B=18.8 18:54:08 UT, R=18.7 During the first hour after the burst the power law slope of the fading OT flux is -0.83 +- 0.09 in R band and is approximatly similar in BVI. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7067 SUBJECT: GRB 071112C : Lulin R-band observation DATE: 07/11/12 23:29:39 GMT FROM: Yuji Urata at Saitama U I.C. Chen (NCU), K.Y. Huang (ASIAA), Y. Urata (Saitama-U/ASIAA) on behalf of the EAFON team "We have observed the GRB 071112C field (Perri et al., GCN 7059) using Lulin 1-m telescope. The R-band image with 150 sec exposure marginally detected the optical afterglow (Perri et al., GCN7059, Yuan et al GCN7061 Wang et al GCN7063) with 20.3 +/- 0.3 at 1.77 hrs after the burst. This result is consistent with extrapolation from the RTT150 observations with power-law index -0.83 reported by Burenin et al. (GCN7066)." This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7068 SUBJECT: Swift-BAT trigger 296491 is not a GRB DATE: 07/11/12 23:37:57 GMT FROM: Scott Barthelmy at NASA/GSFC J. Cummings (GSFC/ORAU), C.B. Markwardt (CRESST/GSFC/UMD), S.D. Barthelmy (GSFC) on behalf of the Swift-BAT team: The Swift-BAT trigger (trigger=296491) at 14:51:39 UT on 12 Nov 07, tentatively labelled GRB 071112A (GCN 7057, Stratta et al.), is not due to a GRB or any other astrophysical source. This trigger is due to a noisy detector. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7069 SUBJECT: GRB 071112C: Palomar Pre-Imaging DATE: 07/11/12 23:40:19 GMT FROM: Josh Bloom at UC Berkeley P. Nugent (LBL) and J. S. Bloom (UC Berkeley) report: "We have created a stacked image through the co-addition of 17 unfiltered images taken by the NEAT collaboration and 42 images in the RG610 filter taken by the Palomar-Quest Consortium at the Palomar Oschin Schmidt telescope (obtained from 2001-2007), of GRB 071112C (Perri et al.; GCN 7059). The stacked image is significantly deeper than the DSS (3 sigma limit of R~24 mag). There is no source at the position of the UVOT counterpart (Perri et al.; GCN 7059), however we do find a faint source 2.24" to the southwest inside the XRT error circle at position: 02:36:50.79 +28:22:15.3 J2000 A preliminary reduction yield a magnitude of R=24.1 +/- 0.4 for that source." The image is available at http://www.lbl.gov/~nugent/deepsky.html This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7070 SUBJECT: GRB071112C: NOT observations DATE: 07/11/12 23:55:27 GMT FROM: Johan U. Fynbo at U.Copenhagen J. Sollerman (DARK and Stockholm), G. Leloudas (DARK), Pall Jakobsson (Hertfordshire), J. P. U. Fynbo, D. Malesani, P. Vreeswijk (DARK) report on behalf of a larger collaboration : We obtained R-band imaging and a spectrum of the optical afterglow of GRB 071112C (Perri et al. GCN #7059) with the Nordic Optical Telescope on November UT 12.9. Unfortunately our observations were hampered by clouds so the signal-to-noise ratio of the spectrum is low. The optical afterglow is clearly detected in our images. The continuum of the optical afterglow is detected to 3800 AA so the redshift of GRB071112C is most likely less than about 2.3. No significant lines are detected. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7071 SUBJECT: GRB 071112B, Swift-BAT partial refined analysis of the SHB DATE: 07/11/13 00:06:15 GMT FROM: Scott Barthelmy at NASA/GSFC E. Fenimore (LANL), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), M. Perri (ASDC), T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-120 to T+182 sec from the recent telemetry downlink, we report further analysis of BAT GRB 071112 (trigger #296503) (Perri, et al., GCN Circ. 7058). The BAT ground-calculated position is RA, Dec = 260.213, -80.884 deg, which is RA(J2000) = 17h 20m 51.0s Dec(J2000) = -80d 53' 02" with an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 78%. The mask-weighted light curve shows two separated narrow peaks. The first starts at T-0.7 sec and has a total width of ~64 msec. The second starts at T+0.0 sec, peaks at T+0.1 sec, and ends at 0.3 sec. T90 (15-350 keV) is 0.30 +- 0.05 sec (estimated error including systematics). The time-averaged spectrum from T-0.0 to T+0.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.69 +- 0.34. The fluence in the 15-150 keV band is 4.8 +- 0.9 x 10^-8 erg/cm2. The 1-sec peak photon flux measured from T-0.38 sec in the 15-150 keV band is 1.3 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The automated script processing has generated fluence and spectral numbers for the second peak only. Since there seems to be urgent need in the community, we are pushing this circular out the door quickly so that at least these partial (second peak only) values are available to the follow-up community. By eye, the first peak appears to have a fluence one third that of the second peak. Also by eye, there appears to be no extended emission for this SHB out to at least T+180 sec and to a flux level ~0.007 counts/cm2/sec. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7072 SUBJECT: GRB 071112B: Swift-XRT preliminary analysis DATE: 07/11/13 00:45:21 GMT FROM: Matteo Perri at ISAC/ASDC M. Perri, G. Stratta (ASDC), D.N. Burrows (PSU) report on behalf of the Swift-XRT team: The Swift-XRT began observing the field of the short hard GRB 071112B (trigger=296503, Perri et al., GCN Circ. 7058) at 19:25:35 UT, about 62 minutes after the BAT trigger. In the first 2.1 ks of Photon Counting mode data, no X-ray source is detected within the refined BAT error circle (Fenimore et al., GCN Circ. 7071) We estimate a 3-sigma upper limit on the count rate of ~5e-3 cts/s. Assuming a power-law spectrum with photon index Gamma=2 and a Galactic column density of 7.9e20 cm-2, this corresponds to an upper limit on the observed flux of ~2e-13 ergs/cm2/s (0.3-10 keV) This is an official product of the Swift XRT Team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7073 SUBJECT: GRB 071112B: Gemini Optical Imaging DATE: 07/11/13 02:17:03 GMT FROM: Josh Bloom at UC Berkeley J. S. Bloom, D. Kocevski (UC Berkeley), and H.-W. Chen report: "We obtained target of opportunity imaging of the field of SHB 071112B (Perri et al. GCN 7058; Fenimore et al. 7071) on Gemini South after twilight. Several images of 15 sec and 180 sec were obtained as the sky darkened. Inspection of a single 180 sec image in r band (start = 2007-11-13 00:51:17.5 UTC) did not reveal a bright new source when compared to DSS2 (Red) inside the reported XRT error circle, although we do note a very weak candidate near the DSS limit at (J2000): RA: 17:21:15.62 DEC: -80:53:50 We make no claims to variability nor newness at this time, but further Gemini observations are planned." We thank Ruben Diaz and the entire Gemini staff for assistance in taking this data. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7074 SUBJECT: GRB 071112B: Gemini Optical Imaging (Correction) DATE: 07/11/13 04:26:08 GMT FROM: Josh Bloom at UC Berkeley J. S. Bloom notes: "The position of the source noted in GCN #7073 should read: 17:21:27.1, -80:53:48 We thank E. Berger for correspondence on this source (who also pointed out that that source appears in the DSS II N-plate)." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7075 SUBJECT: GRB 071112B: Magellan i-band imaging DATE: 07/11/13 04:26:52 GMT FROM: Edo Berger at Princton U E. Berger (Princeton/OCIW) and P. Challis (CfA) report: "We observed the BAT error circle of the short GRB 071112B (GCN 7071) with LDSS3 on the Magellan/Clay telescope. A total of 1200 sec were obtained in the i-band in 0.9" seeing starting 6.25 hours after the burst. A comparison to DSS reveals no new bright sources within the BAT error circle. A comparison of the first and final images (with a separation of 20 min) reveals no clear fading sources, although we note that the time baseline is very short. Further observations are in progress." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7076 SUBJECT: GRB 071112C: VLT redshift DATE: 07/11/13 05:40:58 GMT FROM: Pall Jakobsson at U Hertfordshire Pall Jakobsson (U. Hertfordshire), Johan P. U. Fynbo, Paul M. Vreeswijk, Daniele Malesani (DARK, NBI) and Jesper Sollerman (DARK, NBI; U. Stockholm) report on behalf of a larger collaboration: Using FORS2 on the Very Large Telescope, we have obtained 2*30 min spectra (grism 300V) of the optical afterglow of GRB 071112C (Perri et al., GCN 7059). The spectrum displays numerous Fe II lines and the Mg II doublet (2796,2803) in absorption corresponding to a redshift of z = 0.823 (based on a preliminary wavelength calibration). At this redshift we also find emission lines corresponding to [O II] 3728 and [O III] 5008. We thank the Paranal staff for excellent support, especially Stephane Brillant and Linda Schmidtobreick. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7077 SUBJECT: Swift UVOT upper limits of GRB071112B DATE: 07/11/13 11:59:51 GMT FROM: Patricia Schady at MSSL/Swift P. Schady (MSSL-UCL) and M. Perri (ASDC) report on behalf of the Swift UVOT team: The Swift UVOT observed the field of GRB 071112B (Perri et al., GCN 7058) 62 minutes after the BAT trigger, once the Earth had come out of observing constraint. No new source is found in any of the UVOT observations in either single or co-added exposures within the refined BAT error circle (Fenimore et al., GCN 7071) or anywhere within the UVOT field of view down to the following 5-sigma upper limits: Filter Tmid Exp Magnitude (s) (s) (5-sigma UL) White 8864 885 > 20.7 v 3826 197 > 18.2 b 8306 197 > 19.5 u 6905 290 > 19.1 uvw1 4236 197 > 18.8 uvm2 4031 197 > 18.7 uvw2 9419 187 > 18.9 where Tmid is the weighted mean of the co-added exposures. The values quoted above are not corrected for the expected Galactic extinction corresponding to a reddening of E(B-V) = 0.12 mag in the direction of the GRB (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7078 SUBJECT: GRB 071112C: Optical observations at Crni Vrh DATE: 07/11/13 12:39:32 GMT FROM: Herman Mikuz at OCV B. Dintinjana, S. Maticic, H. Mikuz and J. Skvarc on behalf of PIKA observing program at Crni Vrh Observatory: We observed the afterglow of GRB 071112C (Perri et al., GCN 7059) with 60-cm Cichocki robotic telescope at Crni Vrh Observatory, Slovenia in rather poor seeing conditions. The series of nineteen 90 second connsecutive exposures with Rc filter started at 18:35:51UT, 118 seconds after the GCN notice time. We confirm optical afterglow found by UVOT. The object measured coordinates are RA=02:36:50.95, DEC=+28:22:16.8 (J2000). The object was clearly detected on first nine frames after which it dropped below the detection limit. Photometry results are given in table below. The magnitudes are derived using comparison stars from the USNO-B1 catalogue. The 3-sigma limiting magnitude in R filter is around magnitude 18.2. Time refers to exposure start. Time (UT) Exposure(s) Mag. Err. Filter 2007 Nov 12.77490 90 17.25 0.13 R 2007 Nov 12.77659 90 17.49 0.15 R 2007 Nov 12.77826 90 17.84 0.18 R 2007 Nov 12.77994 90 17.82 0.21 R 2007 Nov 12.78162 90 18.53 0.29 R 2007 Nov 12.78330 90 18.81 0.63 R 2007 Nov 12.78498 90 18.51 0.31 R 2007 Nov 12.78665 90 18.68 0.49 R 2007 Nov 12.78834 90 18.88 0.62 R //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7079 SUBJECT: GRB 071112C: Swift XRT refined analysis DATE: 07/11/13 14:46:22 GMT FROM: Giulia Stratta at ASDC G. Stratta (ASDC) , M. Perri (ASDC) and D. N. Burrows (PSU) report on behalf of the Swift Team: We have analysed the first 7 orbits of Swift-XRT data obtained for GRB 071112C (Perri et al. GCN Circ.7059), totaling 281 s of Windowed Timing (WT) data and 29.1 ks of Photon Counting (PC) data. Using 625 s of overlapping XRT Photon Counting mode and UVOT V-band data, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA,Dec =39.21220, 28.37102 which is equivalent to: RA (J2000): 02 36 50.93 Dec (J2000): +28 22 15.7 with an uncertainty of 1.7 arcsec (radius, 90% confidence). This is 1.0 arcsec from the previous XRT position, 0.7 arcmin from the BAT position and 1.0 arcsec from the UVOT position (Perri et al, GCN Circ. 7059). The bright X-ray light-curve can be fit by a simple power-law, with a decay index of 1.35 +/- 0.1. Between about 400s and 1100s from the trigger, the data deviate from the model, possibly pointing out a smooth re-brightening. The WT data (91-372 seconds from trigger) can be modeled as an absorbed power-law, with photon index of 1.7 +/- 0.1 and a total absorbing column density consistent with the Galactic value of NH=7.4e20 cm^-2 (Dickey & Lockmann 1990). The 0.3-10 keV observed (unabsorbed) flux during this time is 4.4e-10(4.9e-10) erg cm^-2 s^-1. Assuming the source continues to decay with the same decay index of 1.35,we predict an XRT count rate of 3.0e-3 counts/s at T+24 hours, which corresponds to an 0.3-10.0 keV observed flux of 1.2e-13 ergs cm^-2 s^-1. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7080 SUBJECT: GRB 071112C: Swift/UVOT observations DATE: 07/11/13 15:29:24 GMT FROM: Samantha Oates at MSSL S.R. Oates (MSSL/UCL) and G. Stratta (ASDC) report on behalf of the Swift-UVOT team: The Swift/UVOT observed the burst GRB 071112C (Perri et al., GCN Circ. 7059) starting with the finding chart exposure in white, 92 seconds after the BAT trigger. The afterglow is detected at the UVOT position given in Perri et al. (GCN Circ. 7059) in white, v, b, u and uvw1. The afterglow decreases with an estimated temporal slope in the v filter of alpha =1.28. The UVOT magnitudes and upper limits from single exposures or co-added exposures are given below: Filter Tstart(s) Tstop(s) Exp(s) Mag ---------------------------------------------- white 92 192 98 17.39 +/- 0.03 859 958 98 19.0 +/- 0.1 v 198 597 393 17.8 +/- 0.08 965 1364 393 19.3 +/- 0.3 b 679 689 10 18.3 +/- 0.4 1444 1626 39 19.7 +/- 0.5 (2.0-sigma) u 654 674 19 17.8 +/- 0.3 1419 1601 39 19.3 +/- 0.5 (2.0-sigma) uvw1 630 649 19 17.7 +/- 0.3 1394 1576 39 19.0 +/- 0.5 (2.3-sigma) uvm2 605 1552 78 >20.5 uvw2 708 1663 55 >20.6 ---------------------------------------------- The values quoted above are not corrected for the expected Galactic extinction corresponding to a reddening of E_{B-V} = 0.119 mag in the direction of the burst (Schlegel et al. 1998). [GCN OPS NOTE(13nov07): Per author's request, in the first line "071121C" was changed to "071112C"; and the first 'v' magnitude was changed from "17.9 +/- 0.4" to "17.8 +/- 0.08".] //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7081 SUBJECT: GRB 071112C: Swift-BAT refined analysis DATE: 07/11/13 19:49:40 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), M. Koss (GSFC/UMD), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), G. Stratta (ASDC), J. Tueller (GSFC), on behalf of the Swift-BAT team: Using a partial data set from T-122 to T+10 sec from the recent telemetry downlink, we report further analysis of BAT GRB 071112C (trigger #296504) (Stratta, et al., GCN Circ. 7059). Because of the unusually short time between detection of GRB 071112B (Perri, et al., GCN Circ. 7058) and this burst, we have only a partial data set. This analysis is based on BAT survey data rather than "event" data. No event data were created for this burst. In particular, the fluence quoted below does not include the tail of the peak, though it appears to include about 80% of the total fluence. The T90 period and our estimate of the 1-second peak photon flux are a little more uncertain than usual as well, and the quoted errors have been increased to reflect this. The BAT ground-calculated position is (RA,Dec) = 39.218 +28.368 {02h 36m 52.3s,+28d 22' 04"} [deg; J2000] +- 1.0 arcmin, (radius, sys+stat, 90% containment). The burst was in the fully-coded field of view. The burst consisted of a single FRED peak. T90 (15-350 keV) is (15 +- 2) sec (estimated error including systematics). The power law index of the time-averaged spectrum is 1.09 +- 0.07. The fluence for the period T-122 to T+10 seconds (including about 80% of the total fluence) in the 15-150 keV band is (3.0 +- 0.4) x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0 sec in the 15-150 keV band is 8 +- 1 ph/cm2/sec. All the quoted errors are at the 90% confidence level. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7082 SUBJECT: GRB071112C MITSuME Okayama Optical Observation DATE: 07/11/13 23:06:45 GMT FROM: Michitoshi Yoshida at Okayama Astrophysical Obs M. Yoshida, K. Yanagisawa, Y. Shimizu, S. Nagayama, H. Toda (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We performed optical imaging observations (G, Rc and Ic) of the field of GRB 071112C (Perri et al., GCN 7059) with 50cm MITSuME telescope at Okayama Astrophysical Observatory from UT 18:35 to UT 19:52 on November 12 2007. We found a fading source at the position of the optical afterglow reported by several authors (Yuan et al., GCN 7061; Wang et al., GCN 7063; Burenin et al., GCN 7066; Chen et al., GCN 7067; Sollerman et al., GCN 7070) in all bands. We made flux calibration using USNO B1.0 catalog. The photometric results are following. start-T end-T mid-T exp-T G Rc Ic --------------------------------------------------------------------- 18:35:34 18:36:34 18:36:04 1min 17.1+-0.1 17.0+-0.1 17.9+-0.1 18:35:34 18:39:00 18:37:17 3min 17.2+-0.1 17.2+-0.1 18.0+-0.1 18:39:12 18:45:09 18:42:10 5min 17.9+-0.1 18.0+-0.1 18.6+-0.1 18:45:19 18:56:20 18:50:49 7min 18.8+-0.2 18.5+-0.2 19.6+-0.2 18:56:30 19:08:46 18:32:38 10min 19.3+-0.4 19.0+-0.2 >19.8 19:08:56 19:57:01 19:32:58 40min >19.5 19.6+-0.2 >20.0 --------------------------------------------------------------------- //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7083 SUBJECT: GRB 071112C : Second Epoch Lulin R-band observations DATE: 07/11/14 00:51:37 GMT FROM: Yuji Urata at Saitama U I.C. Chen (NCU), K.Y. Huang (ASIAA), Y. Urata (Saitama-U/ASIAA) on behalf of the EAFON team : "A series of R-band images for GRB 071112C field (Perri et al., GCN 7059) were taken with 300 sec exposure using Lulin 1-m telescope. The afterglow was detected clearly in our R-band combined image. Comparison with nearby USNOB stars, the brightness of afterglow is 22.7 +/- 0.2 at 0.806 days after the burst. This measurement is consistent with the extrapolation from the RTT150 observations (Burenin et al., GCN 7066) and implies no temporal break during our two epochs of R-band observations (Chen et al.; GCN7067)." This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7084 SUBJECT: GRB 071112C: SARA upper limit DATE: 07/11/14 03:26:40 GMT FROM: Adria C. Updike at Clemson U Adria C. Updike, Dieter H. Hartmann (Clemson University) and Kenneth S. Rumstay (Valdosta University) report on behalf of the Clemson GRB Follow-Up Team: We imaged the field of GRB 071112C (GCN 7059, Perri et al.) with the 0.9m SARA telescope on Kitt Peak under decent weather conditions. We obtained 75 min of stacked exposures beginning 8 hours and 47 min after the trigger. We do not detect the afterglow (GCN 7059, Perri et al.) down to a limiting magnitude of R ~ 21 in the stacked images (based on calibration of 10 field stars to the USNO B1.0 catalog). The SARA observatory website may be found at http://astro.fit.edu/sara/sara.html . This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7085 SUBJECT: GRB 071112B: 2nd epoch of Magellan i-band imaging DATE: 07/11/14 04:29:02 GMT FROM: Edo Berger at Princton U E. Berger (Princeton/OCIW) and P. Challis (CfA) report: "We re-observed the BAT error circle of the short GRB 071112B (GCN 7071) with LDSS3 on the Magellan/Clay telescope. A total of 1200 sec were obtained in the i-band in 0.8" seeing starting about 30 hours after the burst. A comparison to our first epoch of imaging taken about 6 hours after the burst (GCN 7075) reveals no variable sources to a conservative limit of about 23.5 mag. Further analysis is in progress." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7086 SUBJECT: GRB 071112C: Gemini Absorption Redshift DATE: 07/11/14 04:51:49 GMT FROM: Antonino Cucchiara at PSU A. Cucchiara and D. B. Fox (Penn State), with E. Berger (Princeton and Carnegie Observatories), report on behalf of a larger collaboration: "Starting on 2007 November 13.33 UT we observed GRB 071112C (Perri et al., GCN 7059) with the GMOS spectrograph on the Gemini North telescope. We obtained 4x900 sec spectra in the wavelength range 3900-6800A. We clearly observe several metal absorption features corresponding to MgII, MgI, FeII, and MnII at a redshift z = 0.823, confirming the preliminary redshift reported from VLT observations by Jacobsson et al.(GCN 7076)." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7087 SUBJECT: GRB 071112C MITSuME Akeno early optical observation DATE: 07/11/14 06:44:18 GMT FROM: Nobuyuki Kawai at Tokyo Tech T. Ishimura, T. Shimokawabe, Y. Mori, Y. Kudou, N. Vasquez, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 071112C (Perri et al., GCN 7059) with the 3-color 50cm MITSuME Telescope at Akeno, Japan starting at 18:34:39 UT, 102s after the trigger. In the images of g' and Rc bands, we detected the optical counterpart reported by several authors (GCNs 7059, 7061, 7062 etc.). Photometric calibration was done using the USNO-B1.0 (Ic-band) and NOMAD (g'-bands) catalogs. The results are following: start time end time Exposure g' [mag] Rc[mag] --------------------------------------------------------------- 18:34:39 18:35:39 1 x 60s 17.6 +/- 0.5 17.3 +/- 0.3 --------------------------------------------------------------- //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7088 SUBJECT: GRB 071112C: emission lines and refined VLT redshift DATE: 07/11/14 14:18:30 GMT FROM: Pall Jakobsson at U Hertfordshire Pall Jakobsson (U. Hertfordshire), Johan P. U. Fynbo, Daniele Malesani, Paul M. Vreeswijk, Jens Hjorth, Dong Xu (DARK, NBI) and Jesper Sollerman (DARK, NBI; U. Stockholm) report on behalf of a larger collaboration: We have flux calibrated the VLT spectrum of the GRB 071112C optical afterglow (Jakobsson et al., GCN 7076). We clearly detect four emission lines: [O II] 3727, [Ne III] 3869 and [O III] 4960,5008. Using the relations by Kennicutt (1998, ARA&A, 36, 189), the flux of the [O II] line corresponds to a star formation rate (SFR) of approximately 0.5 M_Sun/year. This value has not been corrected for host extinction or slit loss, and is therefore a strict lower limit to the actual SFR. The flux ratio of [Ne III] and [O II] is typical of GRB host galaxies, with log([Ne III]/[O II]) ~ -0.5 (see Fig 4 in Wiersema et al., arXiv:0706.1345v1). The presence of such strong emission lines in the OA spectrum indicates a fairly bright host, approximately 24 < R < 25 (see also Nugent & Bloom, GCN 7069). Finally, using new wavelength calibration files we report a more accurate absorption redshift (based on 8 lines): z = 0.8230 +/- 0.0003. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7089 SUBJECT: GRB 071112C: optical observation DATE: 07/11/14 15:59:03 GMT FROM: Giuseppe Greco at U Bologna G. Greco (Bologna University), F. Terra (Second University of Roma "Tor Vergata"), C. Bartolini, A. Guarnieri, A. Piccioni (Bologna University), G. Pizzichini (INAF/IASF Bologna), D. Nanni (INAF/OAR and Second University of Rome "Tor Vergata"), R. Gualandi (Bologna Observatory) report: We observed the afterglow of GRB 071112C (Perri et al., GCN 7059) with the 152 cm Cassini Telescope located in Loiano under clear sky conditions (seeing approximately 1.8 arcsec). We obtained three 20 min Rc-band images starting on 2007 November 12.929 UT (mean time). In our co-added images we estimated the following magnitude by comparison with the NOMAD1 catalog: Rc= 21 +/- 0.2 This result is consistent with a power-law index = -0.8 as reported by Burenin et al. (GCN7066) and Chen et al. (GCN 7083). The co-added Rc image, in which the comparison stars are marked, has been posted in our public directory from where it can be retrieved by sftp using hostname: ermione.bo.astro.it username: publicGRB password: GRB_bo. directory: GRB071112C //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7090 SUBJECT: GRB 071112C: optical observation DATE: 07/11/14 19:45:18 GMT FROM: AAVSO GRB Network at AAVSO Stefano Sposetti (Gnosca, Switzerland) reports to the AAVSO International High Energy Network the following optical observations of GRB071112C (GCN #7059, Perri et al.): Stefano Sposetti reports the detection of the optical afterglow of GRB071112C (Perri et al., GCN 7059, and several subsequent reports). The afterglow was observed unfiltered for 2700 seconds, using a 0.4-meter Newtonian with an SBIG ST8XE CCD and no filter. Observations commenced approximately 4 hours and 10 minutes post BAT detection; the midpoint of the observational sequence was 2007 November 12.9625 UT. The afterglow was detected at an unfiltered magnitude of 21.0 +/- 0.5, calibrated relative to USNO-A2.0. This magnitude is consistent with the reported detection by Greco et al. (GCN #7089) on November 12.929 UT at Rc = 21 +/- 0.2. A detailed report on these observations is available on the AAVSO website at ftp://ftp.aavso.org/grb/StefanoSposetti_GRB071112C_2454419.20588_.txt A fits image is available at ftp://ftp.aavso.org/grb/StefanoSposetti_GRB071112C_2454419.20588_.fits The AAVSO thanks the Curry Foundation for their continued support of the AAVSO International High Energy Network. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7091 SUBJECT: GRB071112C: Errata of MITSuME Ic band photometry DATE: 07/11/15 01:05:31 GMT FROM: Michitoshi Yoshida at Okayama Astrophysical Obs M. Yoshida, K. Yanagisawa, Y. Shimizu, S. Nagayama, H. Toda (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: The Ic band photometry results reported in GCN 7082 are not correct. The correct values are 1.5 magnitude brighter than those in GCN 7082. We made a mistake in calculating the zero point magnitudes of our Ic band frames. We also checked the results of other two bands (g' and Rc) photometry carefully and found they are correct. Please discard the results of GCN 7082. The reviced data are following. Observation date: 2007-11-12 UT start-UT end-UT mid-UT exp-T g' Rc Ic --------------------------------------------------------------------- 18:35:34 18:36:34 18:36:04 1min 17.1+-0.1 17.0+-0.1 16.4+-0.1 18:35:34 18:39:00 18:37:17 3min 17.2+-0.1 17.2+-0.1 16.5+-0.1 18:39:12 18:45:09 18:42:10 5min 17.9+-0.1 18.0+-0.1 17.1+-0.1 18:45:19 18:56:20 18:50:49 7min 18.8+-0.2 18.5+-0.2 18.1+-0.2 18:56:30 19:08:46 18:32:38 10min 19.3+-0.4 19.0+-0.2 >18.3 19:08:56 19:57:01 19:32:58 40min >19.5 19.6+-0.2 >18.5 --------------------------------------------------------------------- //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7092 SUBJECT: GRB 071112C: WSRT Radio Observations DATE: 07/11/15 06:53:30 GMT FROM: Alexander van der Horst at NASA/MSFC A.J. van der Horst (NASA/MSFC) and R.A.M.J. Wijers (University of Amsterdam) report on behalf of a larger collaboration: "We observed the position of the GRB 071112C afterglow at 4.9 GHz with the Westerbork Synthesis Radio Telescope at November 14 16.61 UT to November 15 4.60 UT, i.e. 1.92 - 2.42 days after the burst (GCN 7059). We do not detect a radio source at the position of the optical counterpart (GCN 7059). The three-sigma rms noise in the map around that position is 93 microJy per beam. The formal flux measurement for a point source at the position of the optical counterpart is 44 +/- 31 microJy. We would like to thank the WSRT staff for scheduling and obtaining these observations." [GCN OPS NOTE(18nov07): Per author's request, the afiliation in the From-line was changed from U of Amsterdam to NASA/MSFC.] //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7094 SUBJECT: GRB 071112C: Optical and NIR data observed with KANATA DATE: 07/11/15 15:13:07 GMT FROM: Makoto Uemura at Hiroshima U M. Uemura, M. Sasada, A. Arai, and T. Uehara (Hiroshima Univ.), report on behalf of the KANATA GRB team: We finished a full reduction of our optical-NIR images of the field of GRB061112C taken with TRISPEC/KANATA. A part of preliminary results was reported in GCN Circ. 7062. Obtained magnitudes are below: # Time after burst V-mag err. # (sec) # mid start end 324 309 339 17.69 0.14 377 362 392 17.89 0.19 430 415 445 17.93 0.20 483 468 498 18.02 0.22 538 523 553 18.15 0.27 590 575 605 18.64 0.53 643 628 658 18.41 0.39 699 684 714 18.30 0.33 752 737 767 18.37 0.36 970 835 1105 18.72 0.36 1271 1136 1406 19.53 0.11 1571 1436 1706 19.59 0.39 1873 1738 2008 19.62 0.53 2173 2038 2308 19.61 0.13 3079 2340 3818 20.66 0.53 4583 3844 5322 19.80 0.34 # # Time after burst J-mag err. # (sec) # mid start end 367 309 425 15.93 0.27 527 469 585 16.37 0.52 688 630 746 16.67 0.28 969 835 1103 17.07 0.42 1269 1136 1402 17.34 0.46 1570 1436 1704 17.19 0.18 1871 1738 2004 17.47 0.41 2172 2038 2306 17.50 0.45 3078 2340 3816 17.97 0.35 4581 3844 5318 >17.67 # # Time after burst Ks-mag err. # (sec) # mid start end 541 309 773 15.00 0.37 1201 835 1567 15.91 0.50 1959 1593 2325 16.58 0.45 2728 2353 3103 16.70 1.01 4222 3130 5314 >16.77 Comparison star: V-band: GSC2.3 02:36:41.48 +28:20:53.5 V=14.43 J-band: 2MASS 02:36:41.46 +28:20:53.4 J=13.238 K-band: 2MASS 02:36:41.46 +28:20:53.4 K=12.792 Using our data, we calculated decay indices, alpha : alpha_V = 0.96 +/- 0.09 alpha_J = 0.82 +/- 0.06 alpha_Ks = 1.01 +/- 0.09 No prominent color change was seen during our observations. After correcting the interstellar extinction in our galaxy (Schlegel, et al. 1998), we calculated the spectral energy index, beta = 0.65 +/- 0.03 between V and Ks-band region. This beta is in agreement with the beta in X-rays (GAMMA_X=1.7, beta_X=0.7, in Stratta et al. GCN Report 104.1), while the optical emission is possibly affected by the reddening effect in the host galaxy of the GRB. As reported in Stratta et al. GCN Report 104.1, there is an X-ray flare around 600-700 sec after the burst, whose amplitude is about factor 4 on the decay trend. We found that no correlated flux variation was found in our V-, J-, and Ks-band data. The upper limit of the amplitude is 0.4 mag in V-band. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7095 SUBJECT: ATCA radio observations of short hard burst GRB 071112B DATE: 07/11/15 16:56:36 GMT FROM: Poonam Chandra at U Virginia/NRAO Mark H. Wieringa (Australia Telescope National Facility), Poonam Chandra (UVA/NRAO), and Dale A. Frail (NRAO) report on behalf of a larger collaboration: "We observed the region centered on the Swift burst GRB 071112B (GCN 7058) using the Australia Telescope Compact Array starting at UT 7.0 Nov 14, 07 and ending at UT 15.0 Nov 14, 07. No emission was seen at a frequency of 8.7 GHz within the BAT error circle. The 5-sigma detection limits in BAT error circle are 235 uJy. The map noise is 47 uJy." The Australia Telescope Compact Array is part of the Australia Telescope which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7096 SUBJECT: VLA radio upper limit on GRB 071112C DATE: 07/11/16 11:54:58 GMT FROM: Poonam Chandra at U Virginia/NRAO P. Chandra (UVA/NRAO) and D. A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: "We observed optically bright burst GRB 071112C (GCN 7059) using the VLA at a frequency of 8.46 GHz. The observations were taken at 08.01 UT on 2007, November 16th. We do not detect any radio emission at the Swift-UVOT afterglow position (GCN 7059). The flux density limit at the afterglow position is -19 +/- 38 uJy. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7101 SUBJECT: VLT FORS2 observations of short hard GRB071112B DATE: 07/11/17 18:36:03 GMT FROM: Rhaana Starling at U of Leicester K. Wiersema, N. Tanvir (Leicester), A. Levan (Warwick), D. Malesani (DARK, NBI), P. Jakobsson (Hertfordshire), E. Rol and R. Starling (Leicester) report on behalf of a larger collaboration: We observed the BAT position of the short GRB 071112B (GCN 7071) using FORS2 on the VLT. We acquired two epochs of data, the first in VRI, the second in R band only. The first R band epoch, consisting of 5 x 4 minutes exposures, started at 00:25:02 UT on 13 november. The second epoch, again 5 x 4 minutes exposures, started at 00:47:00 UT on 14 november. Both epochs were taken in good seeing conditions (0.7 and 0.9 arcsec respectively) but at high airmass. Limiting magnitudes (3 sigma) are estimated at R = 25.2 and R = 25.5 for the first and second epochs, respectively. Both visual inspection and PSF-matched image subtraction using the ISIS2 code (Alard 2000) did not reveal a significantly fading source in or near the BAT error circle. We note that the limiting magnitudes above may not be fully representative for the upper limit on the afterglow brightness, as the BAT error circle contains some nebulosity, and the dithering pattern employed to avoid the chip-gap between the two FORS2 chips means that a narrow strip through the error circle has received comparatively less illumination. We thank the Paranal staff for their excellent support, particularly Stephane Brillant and Linda Schmidtobreick. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7107 SUBJECT: GRB 071112B: Gemini Image Differencing DATE: 07/11/18 18:40:47 GMT FROM: Josh Bloom at UC Berkeley D. Kocevski and J. S. Bloom (U.C. Berkeley), on behalf of a larger collaboration, report: "We performed image subtraction between multiple r-band observations of the error box of SHB 071112B (Perri et al. GCN 7058; Fenimore et al. 7071) on Gemini South. The first epoch of observations began at 2007-11-13 00h14m UTC (airmass ~2.0) followed by a second epoch ~4 hours later at 2007-11-13 04h08m UTC (airmass ~2.6), with total exposures of 1800 sec and 1043 sec, seconds respectively. Image subtraction using the public IPP package (*) software shows no variable sources to r=23.7 mag (3 sigma) within the >95% of the BAT error circle. No further observations are planned." This message may be cited. * See http://pan-starrs.ifa.hawaii.edu/project/IPP/software/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7135 SUBJECT: GRB 071112C: Optical/NIR observations DATE: 07/11/26 22:26:00 GMT FROM: Paul Price at IfA,UH T. Minezaki (IoA, Tokyo), P.A. Price (IfA, Hawaii), Y. Yoshii (IoA, Tokyo) and L.L. Cowie (IfA, Hawaii) report: We observed the optical afterglow of GRB 071112C (GCN #7059) with the MAGNUM telescope + MIPS dual-beam imager in RIJHK bands, commencing at 2007-11-13T05:26Z. We detect the afterglow in coadded images for each of these bands, though only marginally in H and K. The following afterglow magnitudes were calibrated using the USNO-B1.0 and 2MASS catalogues: Filter midtime(UTC) integ.time(min) magnitude R 2007-11-13 6.5h 39 22.18 +- 0.11 I 2007-11-13 6.8h 39 22.06 +- 0.18 J 2007-11-13 6.2h 19 21.1 +- 0.3 H 2007-11-13 7.1h 18 21.2 +- 0.8 * marginally K 2007-11-13 6.8h 18 19.1 +- 0.3 * marginally This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7334 SUBJECT: Early optical shallow decay in GRB 071112C DATE: 08/02/27 10:46:31 GMT FROM: Kuiyun Huang at ASIAA K. Y. Huang, M. E. Schwamb, J. H. Wang, C. Y. Wen, and TAOS team The TAOS (Taiwan American Occultation Survey) telescopes responded to GRB 071112C (Perri et al.,7059) and started to take images at 93s after the burst (38s after the GCN notice time). The magnitude of afterglow, compared with a nearby USNOB star, showed R~ 16.7 at 95.5s after the burst. It is interesting to note that brightness of this afterglow displayed a shallow decrease in our first few hundred seconds. This behavior was also mentioned by Yuan et al. (GCN 7061) in the ROTSE-IIIc observations. The further data analysis is ongoing. This message may be cited.