//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8117 SUBJECT: GRB 080822B: Swift detection of a burst DATE: 08/08/22 21:27:55 GMT FROM: Scott Barthelmy at NASA/GSFC S. T. Holland (CRESST/USRA/GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (NASA/UMBC), V. Mangano (INAF-IASFPA), F. E. Marshall (NASA/GSFC), C. Pagani (PSU), D. M. Palmer (LANL), M. Perri (ASDC), B. Preger (ASDC), R. L. C. Starling (U Leicester) and G. Stratta (ASDC) report on behalf of the Swift Team: At 21:02:52 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080822B (trigger=321376). Swift did not slew to this burst because of the Moon observing constraint. It will come out of Moon constraint early 26 Aug 08 UT. The BAT on-board calculated location is RA, Dec 63.495, +25.743, which is RA(J2000) = 04h 13m 59s Dec(J2000) = +25d 44' 34" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT TDRSS light curve does not show anything significant which is typical for an image trigger. Burst Advocate for this burst is S. T. Holland (sholland AT milkyway.gsfc.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.) [GCN OPS NOTE(22aug08): Per author's request, the missing "B" suffix on the burst name was added.] //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8123 SUBJECT: GRB 080822B: MASTER optical observation DATE: 08/08/23 11:08:44 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs MASTER-Net Team: D.Kuvshinov, V. Lipunov, V.Kornilov, E.Gorbovskoy, A.Belinski, N.Shatskiy, N.Tyurina, Sternberg Astronomical Institute, Moscow Union 'Optic' A. Tlatov, I.Golubov Kislovodsk Solar Station of the Pulkovo observatory V.Krushinski, I.Zalognikh Ural State University, Kourovka S.Yazev, K.Ivanov Irkutsk State University MASTER robotic Net (Moscow region, http://observ.pereplet.ru) responded to GRB080822B (Holland et al., GCN Circ 8117) by hand due to internet problem at the Moscow Region Site. The first image was started at 2008-08-22 21:21:35 UT, 18m 43s after the GRB time. The unfiltered image is calibrated relative to USNO A2.0 (0.8 R + 0.2 B). The robot did not find OT-candidate in error box. T-Tgrb Mean Time Exposition Limit Coadd? 1123 s 1138 s 30 s 17.0 no 1123s 1692 s 25x30 s 18.8 yes The message can be cited. mailto: lipunov@sai.msu.ru //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8128 SUBJECT: GRB 080822B, Swift-BAT refined analysis DATE: 08/08/24 21:02:00 GMT FROM: Scott Barthelmy at NASA/GSFC G. Sato (ISAS), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), S. T. Holland (CRESST/USRA/GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+903 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080822B (trigger #321376) (Holland, et al., GCN Circ. 8117). The BAT ground-calculated position is RA, Dec = 63.560, 25.760 deg, which is RA(J2000) = 04h 14m 14.5s Dec(J2000) = +25d 45' 35.5" with an uncertainty of 3.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 82%. The mask-weighted light curve shows weak emission starting around T-50 sec and ending around T+70 sec. T90 (15-350 keV) is 64 +- 20 sec (estimated error including systematics). The time-averaged spectrum from T+0.0 to T+64.0 sec is fit by a power law. This fit gives a photon index 2.54 +- 0.5. (chi squared 76.5 for 59 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.7 +- 0.6 x 10^-07 erg/cm2 and the 1-sec peak flux measured from T+0.00 sec in the 15-150 keV band is 0.06 +- 0.02 ph/cm2/sec. All the quoted errors are at the 90% confidence level. We note that this is a weak detection for BAT and that we can not rule out a non-burst explanation for this trigger.