//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9659 SUBJECT: GRB 090712: Swift detection of a burst DATE: 09/07/12 04:00:29 GMT FROM: David Palmer at LANL S. T. Holland (CRESST/USRA/GSFC), N. Gehrels (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), A. Rowlinson (U Leicester), M. H. Siegel (PSU) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: At 03:51:05 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090712 (trigger=357072). Swift could not slew due to the Sun constraint. The BAT on-board calculated location is RA, Dec 70.103, +22.557 which is RA(J2000) = 04h 40m 25s Dec(J2000) = +22d 33' 26" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single broad triangular peak structure with a duration of about 100 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~0 sec after the trigger. Because of the constraint, the BAT position is unobservable by Swift until 21st July 2009. There will thus be no prompt XRT or UVOT data for this 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.) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9660 SUBJECT: GRB 090712: Swift-BAT refined analysis DATE: 09/07/12 16:08:32 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), S. T. Holland (CRESST/USRA/GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+355 sec from recent telemetry downlinks, we report further analysis of BAT GRB 090712 (trigger #357072) (Holland, et al., GCN Circ. 9659). The BAT ground-calculated position is RA, Dec = 70.097, 22.525 deg, which is RA(J2000) = 04h 40m 23.2s Dec(J2000) = +22d 31' 29.4" with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 67%. The mask-weighted light curve shows a mostly smooth peak starting at ~T-160 sec, peaking at ~T_zero, and ending at ~T+170 sec. T90 (15-350 keV) is 145 +- 52 sec (estimated error including systematics). The time-averaged spectrum from T-99.1 to T+157.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.33 +- 0.11. The fluence in the 15-150 keV band is 4.0 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-6.10 sec in the 15-150 keV band is 0.9 +- 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/357072/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9662 SUBJECT: GRB 090712: Fermi GBM observation DATE: 09/07/13 15:26:01 GMT FROM: Andreas von Kienlin at MPE A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team: "At 03:51:00.34 UT on 12 July 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090712 (trigger 269063462 / 090712160), which was also detected by the SWIFT-BAT (Holland et al. 2008, GCN 9659, Barthelmy et al., GCN 9660). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 33 degrees. The GBM light curve shows one single pulse with a duration (T90) of about 72 s (8-1000 keV). The time-averaged spectrum from T0-22.528 s to T0+49.153 s is best fit by a power law function with an exponential high energy cutoff. The power law index is -0.68 +/- 0.13 and the cutoff energy, parameterized as Epeak, is 505 +/- 101 keV (chi squared 511 for 486 d.o.f.). The event fluence (8-1000 keV) in this time interval is (4.2 +/- 0.3)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+7.168 s in the 8-1000 keV band is 0.63 +/- 0.04 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."