This file contains both the INTEGRAL GRB 080613A burst and the Swift GRB 080613B burst. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7871 SUBJECT: GRB 080613 : a long GRB detected with INTEGRAL DATE: 08/06/13 10:31:23 GMT FROM: Diego Gotz at CEA D. Gotz (CEA-Saclay), A.Paizis, S.Mereghetti (IASF-Milano), V.Beckmann, M. Beck, R. Galis (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: A GRB lasting about 30 s has been detected by IBAS in IBIS/ISGRI data at 09:35:21 UT of June 13 2008. The coordinates (J2000) are: RA: 213.2742 [degrees] DEC: +5.1687 [degrees] with an uncertainty of 1.5 arcmin (90% c.l.). A preliminary analysis yields a peak flux integrated over 1 s of about 1.3 ph/cmsq/s (20-200 keV) and a fluence over the same energy range of about 1.3e-6 erg/cmsq. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7872 SUBJECT: GRB 080613: Faulkes Telescope North optical candidate DATE: 08/06/13 11:00:20 GMT FROM: Cristiano Guidorzi at INAF-OAB C. Guidorzi (INAF-OAB), E. Rol (U. Leicester), I. Steele, A. Melandri, C.G. Mundell, D.F. Bersier, M.F. Bode, M.J. Burgdorf, S.N. Fraser, S. Kobayashi, C.J. Mottram, R.J. Smith (Liverpool JMU), A. Gomboc (U. Ljubljana), P. O'Brien, N. Bannister, N. Tanvir (U. Leicester) report on behalf of larger GRB collaboration: The 2-m Faulkes Telescope North observed the field of the INTEGRAL GRB 080613 (Gotz et al. GCN Circ. 7871) starting 3.9 min after the trigger time. We detect an uncatalogued, likely fading source in R (~19 mag) also visible in B and i' bands and not visible in the DSS, within the offline INTEGRAL error circle at the following position (J2000): RA = 14:13:05.02 Dec= +5:10:23.5 Further observations are being taken. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7873 SUBJECT: GRB 080613B: Swift detection of a burst DATE: 08/06/13 11:27:48 GMT FROM: Scott Barthelmy at NASA/GSFC C. B. Markwardt (CRESST/GSFC/UMD), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), G. Cusumano (INAF-IASFPA), C. Gronwall (PSU), C. Guidorzi (INAF-OAB), S. T. Holland (CRESST/USRA/GSFC), J. Mao (INAF-OAB), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), J. P. Osborne (U Leicester), K. L. Page (U Leicester), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester), G. Tagliaferri (INAF-OAB) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team: At 11:12:37 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080613B (trigger=313954). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 173.797, -7.098 which is RA(J2000) = 11h 35m 11s Dec(J2000) = -07d 05' 53" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows multiple overlapping peaks with a duration of about 50 sec. The peak count rate was ~10000 counts/sec (15-350 keV), at ~T+0 sec after the trigger. The XRT began observing the field at 11:13:47.4 UT, 69.5 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 173.79896, -7.10590 which is equivalent to: RA(J2000) = 11h 35m 11.75s Dec(J2000) = -07d 06' 21.2" with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 29 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy. The initial flux in the 2.5 s image was 3.83e-09 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 79 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 19.7 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 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.04. Burst Advocate for this burst is C. B. Markwardt (Craig.Markwardt AT nasa.gov). 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: 7875 SUBJECT: GRB 080613B: Swift-XRT refined analysis DATE: 08/06/13 18:11:13 GMT FROM: Cristiano Guidorzi at INAF-OAB J. Mao, C. Guidorzi, F. Pasotti (INAF-OAB) and C. B. Markwardt (CRESST/GSFC/UMD), report on behalf of the Swift-XRT team: The Swift-XRT began observing GRB 080613B (trigger=313954, Markwardt et al., GCN Circ. 7873) in Windowed Timing (WT) mode, 76 s after the BAT trigger. The data of the first orbit consist of 149 s in Windowed Timing mode and 794 s in Photon Counting mode. Using 757 s of overlapping XRT Photon Counting mode and UVOT 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 = 173.79773, -7.10501 which is equivalent to: RA (J2000): 11 35 11.46 Dec (J2000): -07 06 18.0 with an uncertainty of 2.3 arcsec (radius, 90% confidence). The light curve from 76 to 219 s can be modelled as a power law with a photon index of 2.15 +/- 0.11 (90%), followed by a sudden drop of about 2 orders of magnitudes up to ~400 s, after which the decay resumes a value around 1.5. The WT mode spectrum spanning from 76 to 219 s can be fit by a power-law model, with a spectral photon index of 1.17 +/- 0.07 and an absorbing column density of 3.7 (-2.0, +2.3)e20 cm^-2 , consistent with the average Galactic one, 3.2e20 cm^-2. The corresponding observed (unabsorbed) 0.3-10 keV flux is 1.05e-9 (1.09e-9) erg cm^-2 s^-1. If the burst continues to decay at the same rate, we predict an XRT count rate of 6e-5 count/s at T+24 hours, which corresponds to an observed 0.3-10 keV flux of approximately 3.5e-15 erg cm^-2 s^-1. However, we caution about this prediction due to the presently large uncertainty on the decay rate. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7876 SUBJECT: GRB 080613B, Swift-BAT refined analysis DATE: 08/06/13 18:41:44 GMT FROM: Scott Barthelmy at NASA/GSFC T. Ukwatta (GWU), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080613B (trigger #313954) (Markwardt, et al., GCN Circ. 7873). The BAT ground-calculated position is RA, Dec = 173.806, -7.102 deg, which is RA(J2000) = 11h 35m 13.3s Dec(J2000) = -07d 06' 06.5" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 89%. The mask-weighted light curve shows several overlapping peaks in a FRED-like envelope lasting out to ~T+180 sec. T90 (15-350 keV) is 105 +- 35 sec (estimated error including systematics). The time-averaged spectrum from T-5.3 to T+236.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.39 +- 0.06. The fluence in the 15-150 keV band is 5.8 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+2.23 sec in the 15-150 keV band is 2.7 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/313954/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7877 SUBJECT: GRB080613B: Swift/UVOT Upper Limits DATE: 08/06/13 22:13:41 GMT FROM: Wayne Landsman at GSFC/SSAI W.Landsman (GSFC/Adnet) and C. Markwardt (CRESST/GSFC/UMD) , on behalf of the Swift/UVOT team. The Swift Ultra-Violet/Optical Telescope (UVOT) began settled observations of GRB 080613B (trigger 313954) 79 seconds after the BAT trigger (Markwardt et al.,GCN Circ. 7873). No afterglow is detected at the enhanced XRT position (Mao et al., GCN Circ.7875) in the initial white finding chart or subsequent summed images. The limiting magnitudes (3-sigma in 5" radius apertures) in each of the UVOT filters are as follows: Filter T_start(s) T_stop(s) Exp(s) Mag UL (3sig) white 79 180 98 >20.4 white 79 7227 627 >21.4 v 185 7566 1167 >20.1 b 665 7023 451 >20.5 u 640 13348 312 >20.1 uvw1 616 13323 1179 >20.8 uvm2 591 12415 1102 >21.2 uvw2 695 18103 936 >21.0 The values quoted above are in the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627). They are not corrected for the expected Galactic extinction corresponding to a reddening of E(B-V)=0.04 mag in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7878 SUBJECT: GRB 080613B - NOT optical and IR nondetections DATE: 08/06/14 01:17:22 GMT FROM: Christina Thoene at Niels Bohr Institute,DARK Cosmo Ctr Christina C. Thoene, Daniele Malesani, Johan P. U. Fynbo (DARK), Lison Malo (Universite de Montreal), Richardo J. Cardenes and Anlaug Amanda Djupvik (NOT) report: We observed the field of GRB 080613B (Markwardt et al., GCN 7873) on June 13 with the NOT on La Palma using StanCam and NOTCAM. Observations of 4x300s in R band were obtained with StanCam starting at UT 21:57 and 5x270s with NOTCAM in the Ks band starting UT 23:17. In the stacked images of both filters we do not detect any optical counterpart within the XRT error circle (Mao et al. GCN 7875). The limiting magnitudes are about R=22 mag and Ks=17.6 based on USNO and 2MASS stars in the field respectively. [GCN OPS NOTE(14jun08): Per author's request, the two references were added and the author list order was chanegd.] //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7879 SUBJECT: GRB 080613B: GROND Upper Limits DATE: 08/06/14 02:16:10 GMT FROM: Christian Clemens at MPE C. Clemens, A. Updike (Clemson University), T. Kruehler, J. Greiner, A. Kupcu Yoldas, A. Yoldas (all MPE Garching) and G. Szokoly (Eoetvoes Univ., Budapest and MPE Garching) report on behalf of the GROND team: We observed the field of GRB 080613B (Swift trigger 313954; Markwardt et al., GCN #7873) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m ESO/MPI telescope at La Silla Observatory (Chile). Observations started at 22:47 UT on June 13th, 2008, 11.6 hrs after the GRB trigger. We do not detect any object within the refined 3.6'' Swift-XRT error circle reported by Mao et al. (GCN #7875) to the following 3-sigma upper limits: g' > 24.4, r' > 24.4, i' > 23.5, z' > 23.5 and J > 22.4. Given upper limits are calibrated against USNO-B1 as well as 2MASS field stars. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7880 SUBJECT: GRB 080613A: GROND Confirmation of the Afterglow Candidate DATE: 08/06/14 02:28:48 GMT FROM: Christian Clemens at MPE C. Clemens, A. Updike (Clemson University), T. Kruehler, J. Greiner, A. Kupcu Yoldas, A. Yoldas (all MPE Garching) and G. Szokoly (Eoetvoes Univ., Budapest and MPE Garching) report on behalf of the GROND team: We observed the field of GRB 080613A (INTEGRAL trigger 5288; Gotz et al., GCN #7871) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m ESO/MPI telescope at La Silla Observatory (Chile). Observations started at 00:25 UT on June 14th, 2008, 14.8 hrs after the GRB trigger with 25 mins of effective exposures in g'r'i'z' and 20 mins in JHK. We do not detect any object at the position reported by Guidorzi et al., GCN #7872) to the following 3-sigma upper limits: g' > 24.2, r' > 23.9, i' > 23.5, z' > 23.4, J > 22.3 and H > 21.3. Given upper limits are calibrated against SDSS as well as 2MASS field stars. This indicates a clear fading of the source. We therefore confirm this to be the afterglow of GRB 080613A. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7881 SUBJECT: GRB080613A: Swift/UVOT Upper Limits DATE: 08/06/14 02:43:26 GMT FROM: Erik Hoversten at Swift/Penn State E. A. Hoversten (PSU) and S. T. Holland (CRESST/USRA/GSFC) on behalf of the Swift/UVOT team. The Swift Ultra-Violet/Optical Telescope (UVOT) began settled observations of the INTEGRAL-detected GRB 080613A (Gotz, et al., GCN Circ. 7871) 6.7 hours after the trigger. No afterglow is detected at the position of the R-band detection by the Faulkes Telescope North (Guidorzi, et al., GCN Circ. 7872). The 22.2 magnitude upper limit in the white band suggests the R~19 object seen by Guidorzi, et al. 3.9 minutes after the trigger has faded and is indeed the afterglow. Filter T_start(s) T_stop(s) Exp(s) Mag UL (3sig) white 24725 25189 456 >22.2 v 25195 25638 436 >20.5 b 24257 24720 456 >21.5 The values quoted above are in the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627). They are not corrected for the expected Galactic extinction corresponding to a reddening of E(B-V)=0.023 mag in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7882 SUBJECT: GRB 080613A: Swift-XRT detection of the afterglow DATE: 08/06/14 09:15:27 GMT FROM: Cristiano Guidorzi at INAF-OAB C. Guidorzi (INAF-OAB) and C. B. Markwardt (CRESST/GSFC/UMD) report on behalf of the Swift-XRT team: The Swift XRT began observing the INTEGRAL GRB 080613A (Gotz et al., GCN Circ 7871) on June 13, 16:19 UT, 24.2 ks after the INTEGRAL trigger. The data consist of 3.6 ks observed in Photon Counting mode. We detect a single X-ray source within the INTEGRAL error circle at the position RA, Dec = 213.27213, +5.17256 which is equivalent to: RA (J2000): 14 13 05.31 Dec (J2000): +05 10 21.2 with an uncertainty of 5.2 arcsec (radius, 90% confidence). This position lies 4.9" from the optical afterglow found with the Faulkes Telescope North (Guidorzi et al., GCN Circ. 7872) and later confirmed by GROND (Clemens et al. GCN Circ. 7880) and Swift-UVOT (Hoversten and Holland, GCN Circ. 7881), and is therefore consistent with being the X-ray afterglow of GRB 080613A. Presently there is marginal evidence for fading: a power-law fit of the light curve gives a decay index of 1.2 ± 1.5, so still compatible with a constant rate of of (2.8 ± 0.3)e-2 counts/s. Forced by the small number of counts, we extracted the 0.3-10 keV spectrum from a 10-pixel radius circular region and adopted the Cash statistics. The spectrum can be fit with a power law with an absorbing column density fixed to the Galactic value (2.0e20 cm-2) and a photon index of 1.3 ± 0.3. The observed (unabsorbed) 0.3-10 keV flux is 1.50 (1.53)e-12 erg cm-2 s-1. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7884 SUBJECT: Konus-Wind observation of GRB 080613B DATE: 08/06/15 15:01:08 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team report: The long GRB 080613B (Swift-BAT trigger #313954: Markwardt et al., GCN 7873, Ukwatta et al., GCN 7876) triggered Konus-Wind at T0=40358.636 s UT (11:12:38.636). The burst light curve shows a multipeaked structure with a duration of ~30s. As observed by Konus-Wind the burst had a fluence of 2.21(-0.38, +0.44)x10^-5 erg/cm2, and a 256-ms peak flux measured from T0-0.144 s of 4.76(-1.24, +1.39)x10^-6 erg/cm2/s (both in the 20 keV - 3 MeV energy range). The time-integrated spectrum of the burst (from T0 to T0+33.024 s) is well fitted (in the 20 keV-3 MeV range) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.05 +/- 0.18 and Ep = 733(-200, +285) keV (chi2 = 56.6/65 dof). Fitting by GRBM (Band) model yields the same alpha and Ep, and only an upper limit on the high energy photon index: beta < -2.05 (chi2 = 56.5/64 dof). All the quoted errors are at the 90% confidence level. The Konus-Wind light curve of this GRB is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB080613_T40358/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7885 SUBJECT: GRB080613A: Optical upper limits with Okayama MITSuME telescope DATE: 08/06/17 23:26:42 GMT FROM: Michitoshi Yoshida at Okayama Astrophysical Obs M. Yoshida, K. Yanagisawa, Kuroda, D., Y. Shimizu, S. Nagayama, Toda, H. (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We performed optical imaging observation (g', Rc, and Ic) of the field of GRB 080613A (Gotz et al. GCN 7871) with 50cm MITSuME telescope at Okayama Astrophysical Observatory from 13:44:35 UT (4h 9m after the trigger) to UT 15:13:05 on June 13 2008. We found no new source within a 10 arcsec radius of the position of the optical afterglow candidate reported by Guidorzi et al. (GCN 7872). Three sigma limiting magnitudes of our observation are listed below. Start-UT mid-UT exp-T g' Rc Ic -------------------------------------------------------------- 2008-06-13 13:44:35 14:28:50 77min >18.4 >17.7 >16.7 -------------------------------------------------------------- //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7886 SUBJECT: GRB080613B: MITSuME upper limits DATE: 08/06/17 23:33:43 GMT FROM: Michitoshi Yoshida at Okayama Astrophysical Obs M. Yoshida, K. Yanagisawa, Kuroda, D., Y. Shimizu, S. Nagayama, Toda, H. (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We performed optical imaging observation (g', Rc, and Ic) of the field of GRB 080613B (Markwardt et al. GCN 7873) with 50cm MITSuME telescope at Okayama Astrophysical Observatory from 11:19:09 UT (6m 31s after the trigger) to UT 12:43:30 on June 13 2008. We could not identify any new source in the XRT error circle (Mao et al. GCN7875). Three sigma limiting magnitudes of our observation are listed below. Observation date: 2008-06-13 UT Start-UT mid-UT exp-T g' Rc Ic ---------------------------------------------------- 11:19:09 11:31:16 10min >18.4 >18.3 >18.0 11:31:26 12:07:28 60min >18.7 >18.4 >18.1 ---------------------------------------------------- //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7888 SUBJECT: VLA upper limit on INTEGRAL burst GRB 080613A DATE: 08/06/20 13:13:45 GMT FROM: Poonam Chandra at U Virginia/NRAO Poonam Chandra (NRAO/UVA) and Dale A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: "We used the Very Large Array to observe the field of view toward GRB 080613A (GCN 7871) at a frequency of 8.46 GHz on 2008 June 16.17 UT. The GRB radio afterglow is undetected and the peak radio flux at the XRT afterglow position (GCN 7882) is 7 ± 45 uJy. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."