This file contains bothe bursts: GRB 061101A and GRB 061110B. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5794 SUBJECT: GRB061110A - Optical Non-detection DATE: 06/11/10 12:17:30 GMT FROM: Brian Schmidt at RSAA, ANU (MSSSO) Brian Schmidt and Gordon Garradd (ANU) report on behalf of a larger collaboration "We have observed the field of GRB061110A with the Uppsala Schmidt Telescope at Siding Spring Observatory. An Image taken at 11:59 UT shows no object at the XRT position brighter than R=19th magnitude." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5795 SUBJECT: GRB 061110: Swift detection of a burst DATE: 06/11/10 12:22:08 GMT FROM: Scott Barthelmy at NASA/GSFC A. D. Falcone (PSU), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), S. Campana (INAF-OAB), M. M. Chester (PSU), J. R. Cummings (NASA/UMBC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), V. Mangano (INAF-IASFPA), F. E. Marshall (NASA/GSFC), T. Mineo (INAF-IASFPA), C. Pagani (PSU), D. M. Palmer (LANL), M. Perri (ASDC), P. Romano (Univ. Bicocca & INAF-OAB), G. Sato (GSFC/ISAS) and L. Vetere (PSU) report on behalf of the Swift Team: At 11:47:21 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 061110 (trigger=238108). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 336.304, -2.267 {22h 25m 13s, -02d 16' 00"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows multiple peaks with a duration of about 30 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~5 sec after the trigger. The XRT began observing the field at 11:48:30 UT, 69 seconds after the BAT trigger. XRT found a bright, fading, uncatalogued X-ray source on-board. The ground-calculated position, based on quick-look data products, is RA(J2000) = 22h 25m 10.0s, Dec(J2000) = -02d 15' 29.1", with an estimated uncertainty of 4.3 arcseconds (90% confidence radius). This location is 55.8 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 5.2e-09 erg/cm2/s (0.2-10 keV). UVOT took a finding chart exposure of 400 seconds with the V filter starting 71 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The 3-sigma upper limit is 19.0 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18.0 mag. No correction has been made for the expected extinction of about 0.3 magnitudes. We note that there are at least 35 galaxies within 10 arcmin of the burst position. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5796 SUBJECT: GRB 061110: ROTSE-III Optical Limits DATE: 06/11/10 12:37:16 GMT FROM: Brad Schaefer at LSU B. E. Schaefer (Louisiana State), E.S. Rykoff (U Mich), F. Yuan (U Mich), W. Rujopakarn (U Arizona), report on behalf of the ROTSE collaboration: ROTSE-IIIa, located at Siding Spring Observatory, Australia, responded to GRB 061110A (Swift trigger 238108), producing images beginning 8.8 s after the GCN notice time. An automated response took the first image at 11:48:04.9 UT, 43.6 s after the burst, under fair conditions. We took 10 5-sec, 10 20-sec and 10 60-sec eposures. 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 BAT error circle and also within the XRT error circle, for both single images and coadding into sets of 10; the field is not crowded. Individual images have limiting magnitudes ranging from 14.3-17.1; we set the following specific limits. start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd? -------------------------------------------------------------------- 11:48:04.9 11:48:09.9 5 16.2 43.6 N 12:07:54.0 12:17:13.9 559 17.5 1232.7 Y //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5797 SUBJECT: GRB 061110 : Optical afterglow candidate DATE: 06/11/10 17:01:14 GMT FROM: Yuji Urata at Saitama U Y.C. Chen, Y.H. Lee, K.Y. Huang, W.H. Ip (NCU), Y. Urata (Saitama-U) on behalf of EAFON team report: "We have performed optical observations using Lulin 1-m telescope for GRB 061110 from 51 min after the burst. We found a optical afterglow candidate of GRB 061110 located at RA = 22:25:09.8 Dec = -02:15:30 in our R and I band images. The source does not appear in DSS-II images. Our quick analysis indicates that the brightness of this source shows about 0.2 mag fading between 51 min and 85 min after the burst. Further deeply observations are encouraged." This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5798 SUBJECT: GRB 061110: Candidate confirmed DATE: 06/11/10 17:29:44 GMT FROM: W.K. Zheng at NAOC M.Zhai, L.P. Xing, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng and W.K. Zheng, on behalf of EAFON report: We have imaged the field of GRB 061110 with the TNT 0.8m telescope at Xinglong Observatory.The first image was taken at 11:48:37 UT, 76s after the burst. There is afaint uncatalogued source within XRT circle at position: Ra 22:25:09.8 Dec -02:15:30.7 J2000 This source has a mag ~19.5 in our combined White image at ~300s after the burst. This coordinate is consistent with the result given by Y.C. Chen et al.(GCN5797) and shows fading behavior, so the candidate is confirmed. Further analysis is under progress. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5799 SUBJECT: GRB 061110: NOT observations DATE: 06/11/10 22:01:29 GMT FROM: Daniele Malesani at Niels Bohr Inst,Dark Cosmology Center Christina C. Thoene, Daniele Malesani, Johan P. U. Fynbo (DARK Cosmology Centre), Christina Henriksen (DARK, NOT) and Dimitri Sharapov (NOT) report on behalf of a larger collaboration: We observed the optical afterglow of GRB061110 (GCNs 5797, 5798) on Nov. 10 UT 19:35 (7.9h after the burst) with ALFOSC at the Nordic Optical Telescope on La Palma in the R and i bands. We determined magnitudes of R=22.5 and i=21.6 using preliminary photometric zeropoints from the NOT webpages. Compared to the R-band magnitudes reported in GCNs 5797 and 5798, the afterglow has faded with a temporal decay index of beta~0.6. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5800 SUBJECT: GRB 061110B: Swift detection of a burst DATE: 06/11/10 22:24:01 GMT FROM: Scott Barthelmy at NASA/GSFC D. B. Fox (PSU), S. D. Barthelmy (GSFC), M. M. Chester (PSU), N. Gehrels (NASA/GSFC), D. Grupe (PSU), J. A. Kennea (PSU), K. M. McLean (LANL/UTD), C. Pagani (PSU), D. M. Palmer (LANL), P. Roming (PSU), T. Sakamoto (NASA/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester) and L. Vetere (PSU) report on behalf of the Swift Team: At 21:58:45 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 061110B (trigger=238174). The BAT on-board calculated location is RA,Dec 323.901, +6.877 {21h 35m 36s, +06d 52' 37"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows several peaks starting at ~T-18 sec and ending at ~T+30 sec with a duration of about 45 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~8 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. The XRT and UVOT will begin observing this field at 22:52 UT. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5801 SUBJECT: GRB 061110B: TAROT Calern observatory optical observations DATE: 06/11/10 22:38:03 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 061110B detected by SWIFT (trigger 238174) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 621.9s after the GRB trigger (6.1s after the notice). The elevation of the field decreased from from 22 degrees above horizon and weather conditions were good. The date of trigger : t0 = 2006-11-10T21:58:45.120 The first image is 90.0s exposure in tracking mode. We do not detect any OT with a limiting magnitude of: t0+622s to t0+712s : R > 16.6 We co-added a series of exposures: t0+622s to t0+1098s : R > 16.9 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. Further observations are planed. N.B. Galactic coordinates are lon= 61.2688 lat=-31.7065 and the galactic extinction in R band is 0.2 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5802 SUBJECT: GRB 061110A, Swift-BAT refined analysis DATE: 06/11/10 23:16:30 GMT FROM: Scott Barthelmy at NASA/GSFC J. Cummings (GSFC/UMBC), L. Barbier (GSFC), S. D. Barthelmy (GSFC), A. D. Falcone (PSU), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team: Using the data set from T-240 to T+726 sec from recent telemetry downlinks, we report further analysis of BAT GRB 061110A (trigger #238108) (Falcone, et al., GCN Circ. 5795). The BAT ground-calculated position is RA,Dec = 336.284, -2.252 deg {22h 25m 8.1s, -2d 15' 6.0"} (J2000) +- 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted lightcurve shows a FRED-like peak starting at ~T-15 sec, peaking at ~T+5 sec, and extending out to ~T+80 sec. T90 (15-350 keV) is 41 +- 2 sec (estimated error including systematics). The spectral lag is 2.75 sec +0.55-0.48 sec (between the 15-25 to 50-100 keV bands). The time-averaged spectrum from T-8.8 to T+38.5 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.67 +- 0.12. The fluence in the 15-150 keV band is 1.1 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+9.74 sec in the 15-150 keV band is 0.5 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5803 SUBJECT: GRB 061110B: Swift-UVOT Initial Observation DATE: 06/11/10 23:26:57 GMT FROM: Pete Roming at PSU P. Roming (PSU), F. Marshall (GSFC), M. Chester (PSU) report on behalf of the Swift UVOT team: UVOT took a finding chart exposure of 131 seconds with the White (160-650 nm) filter starting 3046 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of the BAT error circle. The typical 3-sigma upper limit has been about 18.5 mag. 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 the expected extinction corresponding to E(B-V) of 0.04. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5804 SUBJECT: GRB 061110B : Liverpool Telescope Optical Afterglow Detection DATE: 06/11/10 23:40:41 GMT FROM: Andrea Melandri at Liverpool John Moores U A.Melandri, C.G. Mundell, S. Kobayashi, C.J. Mottram, I.A. Steele, R.J. Smith, D. Carter, D. Bersier, M.F. Bode (Liverpool JMU) report: The 2-m Liverpool Telescope robotically followed up GRB 061110B (Fox et al. GCN 5800, trigger=238174) beginning 20.0 min after the GRB trigger time (UT:22:18:45.51). We find a fading source with R=19.5 +/- 0.3 mag (T+25 min) located at RA = 21:35:40.4 Dec = +06:52:34.1 (0.5" uncertainty) that we identify as the possible optical afterglow of GRB061110B. Magnitude was estimated with respect to USNO B1 catalog. Further observations are on going. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5805 SUBJECT: GRB 061110B: Swift/XRT position DATE: 06/11/10 23:55:34 GMT FROM: Jamie A. Kennea at PSU/Swift-XRT J. A. Kennea, J. L. Racusin, D. N. Burrows and D. Grupe (PSU) report on behalf of the Swift/XRT team: At 22:52UT the Swift/XRT began observing GRB 061110B (GCN 5800). In analysis of quicklook data we detect a faint uncatalogue point source at the following location: RA(J2000): 21h 35m 40.4s Dec(J2000): +6d 52m 36.0s with an estimated uncertainty of 9.6 arcseconds radius (90% containment). This position lies 1.9 arcseconds from the Liverpool Telescope afterglow candidate (GCN 5804) and 62 arcseconds from the BAT position. It is not possible to determine at this time if this source is fading. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5806 SUBJECT: GRB 061110A: Swift XRT refined analysis DATE: 06/11/11 00:05:23 GMT FROM: Loredana Vetere at PSU L. Vetere, D. Morris, C. Pagani, J. Racusin, A. Falcone, D. N. Burrows (PSU) report on behalf of the Swift XRT team: We have analysed the first 3 orbits of XRT data for GRB 061110A. A 560s photon counting mode image provides a refined XRT position: RA(J2000) = 22 25 09.9 Dec(J2000) = -02 15 30.7 with an uncertainty of 3.7 arcsec (90% containment). This position is 2.2 arcsec away from the previous XRT position (Falcone et al. GCN 5795), 1.66 arcsec away from the optical afterglow detection by Chen et al. (GCN 5797) and 1.5 arcsec away from its later confirmation by Zhai et al. (GCN 5798). The X-ray light curve in PC mode shows a rapid decay with a slope of -2.36 +/-0.22 in all the 1st orbit. While the 2nd and 3rd orbits show flattening. A power-law fit to the WT spectrum gives a photon index of 3.1 +/- 0.2 and a column density of (1.6 +/- 0.2)e21 cm^-2. We note that the galactic hydrogen column density in the direction of the burst is 4.94e20 cm^-2. The 0.2-10.0 keV observed mean flux during WT observation is 1.1-09 ergs cm^-2 s^-1, which corresponds to an unabsorbed flux of ergs 3.4e-09cm^-2 s^-1. We are waiting for new data to make a prediction of the count rate. Note that the new event, GRB 061110B (GCN 5800), is 1hr away in RA and it is currently taking all the time from this observation. This circular is an official product of the Swift XRT Team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5807 SUBJECT: GRB 061110B: NOT optical observations DATE: 06/11/11 01:02:28 GMT FROM: Christina Thoene at Niels Bohr Institute,DARK Cosmo Ctr Christina C. Thoene, Daniele Malesani, Johan P. U. Fynbo (DARK Cosmology Centre), Christina Henriksen (DARK, NOT) and Dimitri Sharapov (NOT) report: We observed the OT of GRB061110B (GCN 5804) starting Nov. 10, UT 23:20 (1h after the burst), with ALFOSC at the NOT on La Palma in R and i. From two sets of 3x300s stacked images, we determined magnitudes of R=22.0 and i=21.5 using preliminary photometric zeropoints from the NOT webpages. Compared to the R-band magnitude reported in GCN 5804, the OT has faded with a temporal decay index of alpha~2.3. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5808 SUBJECT: GRB061110B: Optical observations at Crni Vrh DATE: 06/11/11 02:15:09 GMT FROM: Herman Mikuz at OCV H. Mikuz on behalf of PIKA observing program at Crni Vrh Observatory reports: We imaged the field of GRB 061110B (SWIFT trigger 238174) with the 60 cm robotic telescope at Crni Vrh Observatory, Slovenia. Due to the object low altitude (16 degrees) and presence of some cirrus clouds, only three 90 second exposures in R filter were secured, starting 44 s after the trigger was received. Exposure start times (in UT) are 22:09:46, 22:15:19 and 22:20:52. No variable object was detected down to a limiting R magnitude 17.2 on single 90 s exposures, nor on three 90 s co-added exposures with R limiting magnitude 17.8. Magnitudes were estimated with the nearby USNO A2 stars. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5809 SUBJECT: GRB 061110B: VLT redshift DATE: 06/11/11 02:32:19 GMT FROM: Daniele Malesani at Niels Bohr Inst,Dark Cosmology Center J.P.U. Fynbo, D. Malesani, C.C. Thoene (NBI-DARK), P.M. Vreeswijk (ESO), J. Hjorth (NBI-DARK), C. Henriksen (NOT and DARK), report on behalf of a larger collaboration: We observed the afterglow of GRB 061110B (Fox et al., GCN 5800, Melandri et al., GCN 5804) with the ESO-VLT UT2 equipped with FORS1. Observations started on 2006 Nov 11.018 UT (2.45 hr after the GRB), and two spectra lasting 30 minutes each were acquired with the grism 300V. From the analysis of the first spectrum, we clearly see a strong DLA through at lambda ~ 5390 AA. From this feature, as well from OI+SiII, CII and SiIV, we measure a redshift of z = 3.44. We acknowledge kind assistance from the ESO staff, in particular Stan Stefl and Chris Lidman. [GCN OPS NOTE(11nov06): Per author's request, the typo in the Subject-line was changed from "061011B" to "061110B".] //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5810 SUBJECT: GRB 061110B, Swift-BAT refined analysis DATE: 06/11/11 03:23:20 GMT FROM: Scott Barthelmy at NASA/GSFC M. Stamatikos (GSFC/ORAU), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), D. Fox (PSU), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), J. Tueller (GSFC) on behalf of the Swift-BAT team: Using the data set from T-119 to T+183 sec from the recent telemetry downlink, we report further analysis of BAT GRB 061110B (trigger #238174) (Fox, et al., GCN Circ. 5800). The BAT ground-calculated position is RA,Dec = 323.916, 6.870 deg {21h 35m 39.8s, 6d 52' 12.2"} (J2000) +- 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted lightcurve has several peaks starting at ~T-18 sec out to ~T+38 sec. There is ongoing low-level emission out to at least T+172 sec at which time the spacecraft slewed to a planned target and the burst location slewed out of the BAT FOV. T90 (15-350 keV) is is at least 128 +- 5 sec (estimated error including systematics). The time-averaged spectrum from T-16.5 to T+127.9 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.03 +- 0.16. The lower limit to the fluence in the 15-150 keV band is 1.3 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+3.26 sec in the 15-150 keV band is 0.4 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The GCN Notices for this burst were delayed (~10 min) because this trigger occurred during a Malindi downlink pass, during which the TDRSS data stream is buffered on-board the spacecraft. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5811 SUBJECT: GRB 061110B: Swift XRT refined analysis DATE: 06/11/11 06:17:00 GMT FROM: Dirk Grupe at PSU/Swift-XRT D. Grupe, D.B. Fox, J. Racusin, J. Kennea, report on behalf of the Swift XRT team: We have analyzed the first three orbits of Swift XRT data of GRB 061110B. The X-ray position was determined from the XRT image using the new teldef file: Ra(2000) = 21 35 40.42 Dec(2000) = +06 52 34.0 with an 4.2" error (90% confidence). This position is 2" away from the initial position given by Kennea et al. (GCN 5805) and 0.1" away from the optical position reported by Melandri et al. (GCN 5804). The X-ray light curve can be fitted by a single power law decay slope alpha=1.35+/0.10. The flux a 4ks after the burst was 2.4e-12 ergs/s/cm2. Our prediction for the flux at 24h after the burst is 4.5e-14 ergs/s/cm2, or 9e-4 XRT counts/s. The spectral analysis shows a typical GRB afterglow spectrum with a power law photon index Gamma=1.9+/-0.4. The absorption column density in consistent with the Galactic value (4.83e20 cm-2). [GCN OPS NOTE(11nov06): Per author's request, the Galactic NH was changed from 4.83e21 to 4.83e20. We thank A.Kann for pointing this out.] //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5812 SUBJECT: GRB 061110A - VLT tentative redshift DATE: 06/11/11 13:54:33 GMT FROM: Christina Thoene at Niels Bohr Institute,DARK Cosmo Ctr Christina C. Thoene, Johan P.U. Fynbo (DARK-NBI), Pall Jakobsson (Univ. of Hertfordshire), Paul M. Vreeswijk (ESO) and Jens Hjorth (DARK-NBI) report on behalf of a larger collaboration: We obtained a series of 3x1800s spectra of the OT of GRB 061110A (GCNs 5797, 5798, 5799) on November 11, 02:50UT (15h after the burst), using FORS1/VLT and grism 300V. At the time of the observations, the OT had a magnitude of about R=22 using photometric zeropoints from the ESO webpages. Based on the detection of weak emission lines at 6551 AA and 8803 AA which we interpret as [OII] 3727 and [OIII] 5007 from the host galaxy, we determine a tentative redshift of z=0.757 for GRB 061110A. The continuum extends down to the blue end of the spectrum at 3600 AA which places an additional limit of z<2 on the redshift of this burst. We thank the staff at VLT for performing the observations. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5813 SUBJECT: Swift/UVOT Upper Limits for GRB061110a DATE: 06/11/11 20:07:07 GMT FROM: Patricia Schady at MSSL/Swift P. Schady (UCL-MSSL), A.D. Falcone (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began observing the field of GRB 061110a at 11:48:32 on 2006-11-10 UT, 71s after the BAT trigger (Falcone et al., GCN 5795). No new source was detected within the XRT error circle (Vetere et al., GCN 5806) or at the afterglow position reported by Zhai et al. (GCN 5798) in coadded images in any filter down to the following 3-sigma magnitude upper limits: Filter T_mid (s) Exp. (s) 3-sigma UL ------------------------------------------------ V 3952 2579 20.42 B 4016 442 20.55 U 3888 452 20.28 UVW1 3792 452 19.72 UVM2 6192 1273 20.55 UVW2 4128 452 20.31 ------------------------------------------------ T_mid is the mid time of the coadded exposure with respect to the BAT trigger. These upper limits are not corrected for Galactic extinction E(B-V) = 0.09. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5814 SUBJECT: Swift/UVOT Upper Limits for GRB061110b DATE: 06/11/11 20:08:47 GMT FROM: Patricia Schady at MSSL/Swift P. Schady (UCL-MSSL), D.B. Fox (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began observing the field of GRB 061110b at 22:49:14 on 2006-11-10 UT, ~50 minutes after the BAT trigger (Fox et al., GCN 5800). No new source was detected within the XRT error circle (Grupe et al., GCN 5811) or at the afterglow position reported by Melandri et al. (GCN 5804) in coadded images in any filter down to the following 3-sigma magnitude upper limits: Filter T_mid (s) Exp. (s) 3-sigma UL ------------------------------------------------ V 12256 1438 20.14 B 19296 2815 21.57 U 18864 2164 21.08 UVW1 18288 1928 20.58 UVM2 18192 1279 20.61 UVW2 13376 1737 20.99 White 15952 2494 21.03 ------------------------------------------------ T_mid is the mid time of the coadded exposure with respect to the BAT trigger. These upper limits are not corrected for Galactic extinction E(B-V) = 0.04. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5815 SUBJECT: Swift TOO observations of GRB061110A DATE: 06/11/11 20:38:25 GMT FROM: Abe Falcone at PSU/Swift A. Falcone (Penn State) and N. Gehrels (GSFC) report on behalf of Swift Team: On 2006 Nov 11 at 19:45:11 UT, Swift began target of opportunity observations of GRB 061110A to resume monitoring the afterglow during the weekend. Follow-up observations with other instruments are encouraged. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5816 SUBJECT: GRB 061110B: NIR Observations DATE: 06/11/12 15:53:17 GMT FROM: Adria C. Updike at Clemson U A. C. Updike, B. C. Donehew, S. D. Brittain, D. H. Hartmann, and A. L. Homewood (Clemson University) report on behalf of the Clemson GRB Follow-up team: We observed GRB 061110B using the Kitt Peak 2.1m telescope and FLAMINGOS. Observations began in the J band 3 hours and 32 minutes after the burst trigger (238174), and consisted of 34 x 120s images. We detect no new sources at the position noted by A. Melandri (GCN 5804) or within the XRT error box. Our limiting J-band magnitude (with respect to the 2MASS catalog) was 18.4 +/- .2 magnitudes. The Clemson University GRB Response Site can be found at: http://people.clemson.edu/~kgarime/burst/index.php This message may be cited. [GCN OPS NOTE(13nov06): Per author's request, "B. Donahue" was changed to "B. C. Donehew".] //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5817 SUBJECT: GRB 061110A: refined R-band analysis DATE: 06/11/12 16:07:43 GMT FROM: Christina Thoene at Niels Bohr Institute,DARK Cosmo Ctr Christina C. Thoene and Johan P. U. Fynbo (DARK Cosmology Centre) report: We further analysed our R-band data of the afterglow of GRB 061110A taken with ALFOSC/NOT (GCN 5799) and FORS1/VLT (GCN 5812). Crosscalibration of the two observation sets with a nearby star (RA=22:25:07.76, Dec=-02:15:00.52) and zeropoints from the ESO webpages gives revised magnitudes of R=23.3 at 8h after the burst (NOT) and R=23.9 at 14h (VLT), where we assume R=22.1 for the magnitude of the star. The offset to the magnitudes reported earlier are due to old ALFOSC zeropoints and refined reduction. Together with the magnitude reported in GCN 5798, we find that a single powerlaw decay with a slope of alpha=0.83 +- 0.08 fits the data well. A plot of the lightcurve can be found at www.astro.ku.dk/~cthoene/GRBs //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 5818 SUBJECT: GRB061110A: Correction to GCN5817 DATE: 06/11/12 19:45:13 GMT FROM: Johan U. Fynbo at U.Copenhagen Johan P. U. Fynbo (DARK) report: Unfortunately I made an error in the gain-correction in the photometry reported in GCN #5817. Here are the correct numbers for the revised photometry. In the NOT images taken about 8 hr after the GRB) we measure R=22.5. In the VLT image taken about 14 hr after the GRB we measure R=23.1. Here we assume R=21.3 for the star at RA(2000) = 22:25:07.760, Dec(2000) = -02:15:00.52. I apologize for the confusion. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6759 SUBJECT: GRB 061110A: redshift confirmed DATE: 07/08/13 17:22:18 GMT FROM: Daniele Malesani at Niels Bohr Inst,Dark Cosmology Center J.P.U. Fynbo, C.C. Thoene, D. Malesani, J. Hjorth, P.M. Vreeswijk (DARK), and P. Jakobsson (Univ. Hertfordshire) report on behalf of a larger collaboration: We inspected in detail our VLT spectra (Thoene et al., GCN 5812) of the afterglow of GRB 061110A (Falcone et al., GCN 5795; Chen et al., GCN 5797). Further to the lines reported in GCN 5812 (6552 and 8803 A), interpreted as [OII] and [OIII] 5007 at z=0.758, we also detect emission at 8547 A, which corresponds to Hbeta at the same redshift. We thus consider the redshift to be secure.