//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7920 SUBJECT: GRB 080702: Swift detection of a short burst DATE: 08/07/02 12:10:31 GMT FROM: David Palmer at LANL M. De Pasquale (UCL-MSSL), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Guidorzi (INAF-OAB), J. A. Kennea (PSU), V. Mangano (INAF-IASFPA), F. E. Marshall (NASA/GSFC), C. Pagani (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL), P. Romano (INAF-IASFPA), T. Sakamoto (NASA/UMBC), B. Sbarufatti (INAF-IASFPA), P. Schady (MSSL-UCL), M. Stamatikos (NASA/ORAU), E. Troja (INAF-IASFPA), T. N. Ukwatta (GSFC/GWU) and P. A. Ward (MSSL-UCL) report on behalf of the Swift Team: At 11:50:43 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080702 (trigger=315710). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 312.853, +72.308 which is RA(J2000) = 20h 51m 25s Dec(J2000) = +72d 18' 28" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with the second peak larger and a total duration of about 1.5 sec. The peak count rate was ~3000 counts/sec (15-350 keV), at ~0.5 sec after the trigger, during the second peak. The XRT began observing the field at 11:51:50.0 UT, 66.3 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 313.05101, 72.31271 which is equivalent to: RA(J2000) = 20h 52m 12.24s Dec(J2000) = +72d 18' 45.8" with an uncertainty of 3.0 arcseconds (radius, 90% containment). This location is 217 arcseconds from the BAT onboard position, slightly outside the BAT error circle. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.53e+21 cm^-2 (Kalberla et al. 2005). UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 72 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The XRT position is outside the 2.7'x2.7' sub-image. 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 0.67. Burst Advocate for this burst is M. De Pasquale (mdp AT mssl.ucl.ac.uk). 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: 7923 SUBJECT: GRB 080702A: Enhanced Swift-XRT position DATE: 08/07/02 19:59:51 GMT FROM: Phil Evans at U of Leicester M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team. Using 95 s of overlapping XRT Photon Counting mode and UVOT data for GRB 080702A, 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 = 313.05081, +72.31271 which is equivalent to: RA (J2000): 20h 52m 12.20s Dec (J2000): +72d 18' 45.8" with an uncertainty of 1.9 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401 http://www.swift.ac.uk/xrt_positions/Goad.pdf), the current algorithm is an extension of this method. This circular was automatically generated, and is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7924 SUBJECT: GRB 080702B : Burst detected in BAT during Swift slew DATE: 08/07/02 20:18:23 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift Jay R. Cummings (NASA/UMBC), A. Copete (Harvard), J. Grindlay (Harvard), D. Palmer (LANL), for the Swift-BAT and BATSS teams At 01:10:41, Swift-BAT observed GRB 080702B. The burst occurred during a preplanned Swift slew maneuver. The rate increase was noted during a routine check of the counting rates for missed out- of-field and slew bursts. A GRB candidate was automatically detected by the BAT Slew Survey (BATSS) with 5.9 sigma in the S band (15-50 keV) and 6.5 sigma in the B band (15-150keV). The burst profile is FRED-like with ~3sec rise and ~30sec decay. The peak count rate is 0.05cts/sec (S band) and 0.04cts/sec (B band). BATSS automated analysis measured T90 = 10.5sec and T50 = 5.5sec, and a position RA = 23h 42m 24s, DEC = -05d 29' 23" with a 90% confidence radius of 6.4arcmin. Further ground analysis of this GRB yielded a location RA, Dec 355.616, -5.424 (J2000) or RA = 23h 42m 27.8s Dec = -05d 25' 26.4" with an estimated error radius of 3 arcmin. A Swift TOO request was submitted, and Swift/XRT and UVOT began observing at about 18:30, approximately 17.3 hours after the burst. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7925 SUBJECT: GRB 080702A: Swift-XRT Team refined analysis DATE: 08/07/02 21:03:07 GMT FROM: Kim Page at U.of Leicester K.L. Page (U. Leicester) & M. De Pasquale (UCL-MSSL) report on behalf of the Swift-XRT team: We have analysed the first 3 orbits of Swift-XRT data obtained for GRB 080702A (De Pasquale et al., GCN Circ. 7920), covering 5.2 ks of Photon Counting mode data, between ~75 and 12.6 ks after the trigger. The UVOT-enhanced XRT position was given by Goad et al. in GCN Circ. 7923. The light-curve can be modelled by a broken power-law, with a flat decay of alpha = 0.5 +/- 0.3 until around the end of the first orbit of data. At this point, the decay steepens to 1.6 +0.9/-0.3. The afterglow is already faint by the end of the third orbit. A spectrum extracted from the first orbit of data can be modelled with an absorbed power-law, with Gamma = 2.05 +0.71/-0.64 and NH = (6.2 +5.4/-3.6)x10^21 cm^-2, in excess of the Galactic column in this direction of 1.53x10^21 cm^-2. The observed (unabsorbed) flux over this time interval (75-800 s post-trigger) is 5.7x10^-12 (1.0x10^-11) erg cm^-2 s^-1. If the light-curve continues to decay with alpha ~ 1.6, the count rate 24 hours after the burst is estimated to be 3.3x10^-5 count s^-1, which corresponds to an observed flux of 2x10^-15 erg cm^-2 s^-1. This is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7926 SUBJECT: GRB 080702A, Swift-BAT refined analysis DATE: 08/07/02 21:52:54 GMT FROM: Scott Barthelmy at NASA/GSFC H. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), M. De Pasquale (UCL-MSSL), T. Sakamoto (GSFC/UMBC), G. Sato (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 recent telemetry downlinks, we report further analysis of BAT GRB 080702A (trigger #315710) (De Pasquale, et al., GCN Circ. 7920). The BAT ground-calculated position is RA, Dec = 313.049, 72.278 deg, which is RA(J2000) = 20h 52m 11.8s Dec(J2000) = +72d 16' 39.7" with an uncertainty of 3.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 81%. The mask-weighted light curve shows a weak single spike. T90 (15-350 keV) is 0.5 +- 0.2 sec (estimated error including systematics). The time-averaged spectrum from T-0.0 to T+0.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.34 +- 0.42. The fluence in the 15-150 keV band is 3.6 +- 1.0 x 10^-8 erg/cm2. The 1-sec peak photon flux measured from T-0.22 sec in the 15-150 keV band is 0.7 +- 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/315710/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7929 SUBJECT: GRB 080702A: MITSuME Akeno optical upper limits DATE: 08/07/03 00:07:25 GMT FROM: Nobuyuki Kawai at Tokyo Tech Y.A. Mori, T. Shimokawabe, Y. Kudou, H. Nakajima and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: The 3-color 50cm MITSuME Telescope at Akeno, Japan, responded to GRB 080702A (de Pasquale et al. GCN 7920) at 43 sec after the trigger, though we obtained the first sky image 20 min after the trigger due to the poor sky condition with frequent cloud coverage. In the co-added images of Ic, Rc, and g' bands, we did not detect any afterglow candidate in the XRT error circle. The 3-sigma limiting magnitudes based on USNO-B1.0 (I-band) and NOMAD (R-band,g'-band) stars are following. Filter start UT end UT Exposure LimitMag --------------------------------------------------- g' 12:16:37 13:11:35 23 x 60 s 16.6 Rc 12:16:37 13:11:35 23 x 60 s 17.7 Ic 12:16:37 13:11:35 23 x 60 s 16.5 --------------------------------------------------- //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7931 SUBJECT: GRB 080702B: Swift XRT and UVOT observations DATE: 08/07/03 10:46:22 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester), P. Schady and M. de Pasquale (MSSL-UCL) report on behalf of the Swift team: Swift began observing the field of GRB 080702B (Cummings et al. GCN circ 7924) at 2008 July 02 at 17:38 UT, 17.3 hours after the burst. In 4 ks of XRT data we do not detect any sources within the refined error circle presented in GCN Circ 7924, down to a 3-sigma upper limit of 2.2 x 10-3 counts s-1. There are two sources within the original error circle in GCN Circ 7924. The brightest lies at RA, Dec=355.6326, -5.5318 degrees, with an estimated uncertainty of 4.7" (radius, 90% confidence). This is coincident with a known optical source, and is not fading; this is thus not the GRB afterglow. The second object lies at RA,Dec=355.5665, -5.51410, which is equivalent to: RA (J2000) = 23 42 15.95 Dec (J2000) = -05 30 50.8 with an estimated uncertainty of 6.3" (radius, 90% containment). The source count rate is around 3e-3 counts per second, and we are unable to determine at present whether this source is fading. In 3.7 ks of UVOT data obtained using the White filter, no new sources are detected. The 3-sigma upper limit at the position of the second XRT source is 22.4 mag. This circular is an official product of the Swift team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7932 SUBJECT: Swift/UVOT observation of GRB080702A DATE: 08/07/03 11:42:40 GMT FROM: Massimiliano de Pasquale at MSSL-UCL M. De Pasquale (MSSL/UCL) on the behalf of the Swift/UVOT team: The Swift/UVOT began settled exposures of the field of GRB080702A 73s after the BAT trigger (De Pasquale et al., GCN Circ. 7920). We do not find any newsource in any of the exposures inside the enhanced XRT error circle (Goad et al., GCN Circ. 7923). The 3-sigma upper limits for detecting a source in the first finding chart (FC) exposure and co-added frames are: Filter T_start(s) T_stop(s) Exp(s) Mag (3-sigma UL) white (FC) 73 172 98 >20.8 white 674 5688 314 >21.4 v 179 578 393 >20.0 v 713 6099 305 >19.8 b 659 6840 334 >20.8 u 634 6714 432 >20.6 uvw1 610 6509 432 >20.2 uvm2 585 6303 432 >20.3 uvw2 689 5894 235 >20.3 The values quoted above are not corrected for the expected high Galactic extinction corresponding to a reddening of E(B-V) = 0.67 mag in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7933 SUBJECT: GRB 080702b: LCO optical observations DATE: 08/07/03 14:16:49 GMT FROM: Edo Berger at Princton U E. Berger (Princeton/OCIW) and B. Madore (OCIW) report: "Starting on 2008 July 2.36 UT we observed the BAT error circle of GRB 080702b (GCN #7924) using the du Pont 100-inch telescope at Las Campanas Observatory. A total of 1500 sec were obtained in R-band in good seeing conditions (0.9"). A comparison to DSS reveals no new sources to the limit of the survey. Further observations are planned." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7934 SUBJECT: No radio detection from the short GRB 080702A DATE: 08/07/03 14:34:32 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 080702A (GCN 7920) at a frequency of 8.46 GHz on 2008 July 03.33 UT. The GRB radio afterglow is undetected and the peak radio flux at the XRT afterglow position (GCN 7923) is -22 ± 52 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: 7937 SUBJECT: GRB 080702B Swift-BAT refined analysis DATE: 08/07/03 20:04:06 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift C. Markwardt (GSFC/UMD), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC),A. Copete (Harvard), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), J. Grindlay (Harvard), H. Krimm (GSFC/USRA),K. McLean (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) On behalf of the Swift-BAT and BATSS teams: Using the event data from T-83 to T+37 seconds, we present further analysis of GRB 080702B. The best-determined position in BAT was RA, Dec 355.616, -5.424 (J2000) or RA = 23h 42m 27.8s Dec = -05d 25' 26.4" with an uncertainty of 3.5 arcmin (radius, sys+stat, 90% containment). The partial coding was varying (the entire burst occurred during a preplanned Swift slew manuever), but was approximately 60% during the entire burst. The mask-weighted light curve shows a single peak with a few second rise, and slow decay. T90 was 20 +- 3 seconds (estimated error including systematics). The time-averaged spectrum from T-2 to T+21 seconds is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.44 ± 0.13. The fluence in the 15-150 keV band was (5.0 ± 0.9) x 10^-7 ergs/cm2/s. The 1-sec peak photon flux measured from T+4 sec in the 15-150 keV band was 0.5 +- 0.1 photons/cm2/s. All the quoted errors are at the 90% confidence level. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7943 SUBJECT: GRB 080702B: GROND Upper Limits DATE: 08/07/04 17:10:15 GMT FROM: Christian Clemens at MPE C. Clemens, S. Loew, J. Greiner, A. Yoldas, T. Kruehler (all MPE Garching), A. Kupcu Yoldas (ESO) and G. Szokoly (Eoetvoes Univ., Budapest and MPE Garching) report on behalf of the GROND team: We observed the field of GRB 080702B (Swift; Cummings et al., GCN #7924) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m ESO/MPI telescope at La Silla Observatory (Chile). Observations started at 09:14 UT on July 3rd, 2008, 32.1 hr after the GRB trigger with 53.6 min of effective exposures in g'r'i'z' and 56.0 min in JHK. They were carried out at an average seeing of 0.9". We do not detect any object at the position of the 2nd XRT source within the 6.3'' error circle reported by Evans et al. (GCN #7931) to the following 3 sigma (optical) and 6 sigma (infrared) upper limits: g' > 24.6 mag, r' > 24.5 mag, i' > 23.6 mag, z' > 23.3 mag, J > 22.0 mag, H > 21.0 mag and K > 19.0 mag. Given upper limits are calibrated against USNO-B1 as well as 2MASS field stars. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7971 SUBJECT: GRB 080702B: Swift XRT confirmation of the afterglow DATE: 08/07/11 09:18:26 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester) and M. de Pasquale (MSSL/UCL) report on behalf of the Swift team. Swift has reobserved the field of GRB 080702B (Cummings et al. GCN Circ. 7924) in two pointings on 2008 July 8 and 2008 July 10 (six and eight days after the burst respectively), obtaining 7 ks of data in total. The second X-ray source reported in our previous circular (Evans et al. (GCN Circ 7931) is not detected in these data, with a 3-sigma upper limit of 1.3e-3 counts per second. The count-rate in the initial observation was (5.4 +/- 1.8)e-3 counts per second, thus the source has faded. We therefore conclude that this was the afterglow of GRB 080702B. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7977 SUBJECT: GRB 080702A: optical upper limit DATE: 08/07/14 14:40:04 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), F. Munz, G. Pizzichini (INAF/IASF Bologna), D. Nanni (INAF/OAR and Second University of Rome "Tor Vergata"), I. Bruni (Bologna Observatory) report: We observed the field of GRB 080702A (GCN 7920, de Pasquale et al.) with the 152 cm telescope located in Loiano under clear sky conditions (seeing~2"). By adding three consecutive 10 min exposures in the Rc filter at mean time 2008 July 02.996 UT we do not detect any afterglow candidate in the XRT error circle (GCN 7923, Goad et al.). Our 3-sigma limiting magnitude is R~21 (based on Nomad1 catalogue). The image 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: GRB080702A