//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8014 SUBJECT: GRB 080725: Swift detection of a burst DATE: 08/07/25 10:43:53 GMT FROM: David Palmer at LANL H. A. Krimm (CRESST/GSFC/USRA), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), P. A. Evans (U Leicester), S. D. Hunsberger (PSU), S. Immler (CRESST/GSFC/UMD), J. Mao (INAF-OAB), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), D. Perez (U Leicester), B. Preger (ASDC), R. L. C. Starling (U Leicester), G. Stratta (ASDC) and L. Vetere (PSU) report on behalf of the Swift Team: At 10:26:14 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080725 (trigger=317888). The BAT on-board calculated location is RA, Dec 121.715, -13.990 which is RA(J2000) = 08h 06m 52s Dec(J2000) = -13d 59' 23" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 60 sec. The peak count rate was ~2800 counts/sec (15-350 keV), at ~3 sec after the trigger. Due to proximity to the Sun, Swift cannot slew to the BAT position. The source will not be observable until September. There will thus be no XRT or UVOT data for this trigger. Burst Advocate for this burst is H. A. Krimm (krimm 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.) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8016 SUBJECT: GRB 080725: REM prompt observations DATE: 08/07/25 11:40:54 GMT FROM: Paolo D'Avanzo at INAF-OAB P. D'Avanzo, D. Fugazza, L.A. Antonelli, L. Calzoletti, S. Campana, G. Chincarini, S. Covino, M.L. Conciatore, S. Cutini, V. D'Elia, F. D'Alessio, F. Fiore, P. Goldoni, D. Guetta, C. Guidorzi, G.L. Israel, E. Maiorano, N. Masetti, A. Melandri, E. Meurs, L. Nicastro, E. Palazzi, E. Pian, S. Piranomonte, L. Stella, G. Stratta, G. Tagliaferri, G. Tosti, V.Testa, S.D. Vergani, F. Vitali report on behalf of the REM team: The robotic 60-cm REM telescope located at La Silla (Chile) observed automatically the field of the GRB 080725 (Krimm et al. GCN 8014) on July 25 starting at 10:34:23 UT (about 8 minutes after the burst, 23 second after the trigger). Observations were carried out during twilight and at high airmass. We do not identify any obvious afterglow candidate down to R > 16.1 and H > 14.5 (3sigma c.l.) inside the BAT error box. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 8019 SUBJECT: GRB 080725, Swift-BAT refined analysis DATE: 08/07/25 20:29:06 GMT FROM: Hans Krimm 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), A. Parsons (GSFC), 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+130 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080725 (trigger #317888) (Krimm, et al., GCN Circ. 8014). The BAT ground-calculated position is RA, Dec = 121.699, -13.984 deg which is RA(J2000) = 08h 06m 47.7s Dec(J2000) = -13d 59' 03.4" with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 42%. The mask-weighted light curve starts with a short, faint precursor from T-105 to T-100 sec. The main emission peak begins at T-20 sec and rises to a peak at T+2 sec. There is a second peak at T+13 sec, and the emission falls to background levels by T+25 sec. T90 (15-350 keV) is 120 (+5, -75) sec (estimated error including systematics). The spacecraft slewed away from the burst location starting at T+100 sec, so there is no data beyond T+130 sec. The time-averaged spectrum from T-105.5 to T+51.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.50 +- 0.10. The fluence in the 15-150 keV band is 3.7 +- 0.2 x 10-6 erg/cm2. The 1-sec peak photon flux measured from T+3.54 sec in the 15-150 keV band is 2.3 +- 0.3 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/317888/BA/