//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9633 SUBJECT: GRB 090709B: Swift detection of a burst DATE: 09/07/09 15:19:58 GMT FROM: Scott Barthelmy at NASA/GSFC F. E. Marshall (NASA/GSFC), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), V. D'Elia (ASDC), P. A. Evans (U Leicester), O. Godet (U Leicester), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), E. A. Hoversten (PSU), H. A. Krimm (CRESST/GSFC/USRA), K. L. Page (U Leicester), D. M. Palmer (LANL), A. Rowlinson (U Leicester), B. Sbarufatti (INAF-IASFPA), M. H. Siegel (PSU), M. A. Stark (PSU), R. L. C. Starling (U Leicester) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: At 15:07:42 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090709B (trigger=356912). Swift did not slew because of Sun constraint. The BAT on-board calculated location is RA, Dec 93.593, +64.085, which is RA(J2000) = 06h 14m 22s Dec(J2000) = +64d 05' 07" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of at least 10 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to a Sun constraint, Swift cannot slew to the BAT position until 18th July 2009. There will thus be no immediate XRT or UVOT data for this trigger. Burst Advocate for this burst is F. E. Marshall (marshall 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: 9641 SUBJECT: GRB 090709B, Swift-BAT refined analysis DATE: 09/07/09 23:02:32 GMT FROM: Hans Krimm at NASA-GSFC T. N. Ukwatta (GWU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), A. M. 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-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 090709B (trigger #356912) (Marshall et al., GCN Circ. 9633). The BAT ground-calculated position is RA, Dec = 93.522, 64.081 deg which is RA(J2000) = 06h 14m 05.4s Dec(J2000) = +64d 04' 51.9" with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 15%. The mask-weighted light curve shows a main peak beginning at T-5 seconds and continuing until T+10 sec. There are then two much weaker peaks at approximately T+25 and T+35 sec. At T+240 sec, a pre-planned spacecraft slew took the source out of the BAT FOV. T90 (15-350 keV) is 27.2 +- 6.6 sec (estimated error including systematics). The time-averaged spectrum from T-5.4 to T+35.9 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.51 +- 0.18. The fluence in the 15-150 keV band is 1.5 +- 0.2 x 10-6 erg/cm2. The 1-sec peak photon flux measured from T+1.47 sec in the 15-150 keV band is 2.1 +- 0.4 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/356912/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 9650 SUBJECT: GRB 090709B: Fermi GBM detection DATE: 09/07/10 15:53:17 GMT FROM: Charles Meegan at NASA/MSFC C. Meegan (USRA) and A. J. van der Horst (NASA/MSFC/ORAU) report on behalf of the Fermi GBM Team: "At 15:07:41.14 UT on 09 July 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090709B (trigger 268844863 / 090709630), which was also detected by the SWIFT-BAT (GCN 9633). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 35 degrees. The GBM light curve consists of two pulses with a duration (T90) of about 32 s (8-1000 keV). The time-averaged spectrum from T0-2.0 s to T0+27.6 s is best fit by a power law function with an exponential high energy cutoff. The power law index is -1.01 +/- 0.16 and the cutoff energy, parameterized as Epeak, is 130 +/- 24 keV (chi squared 354 for 365 d.o.f.). The event fluence (8-1000 keV) in this time interval is (1.3 +/- 0.2)E-6 erg/cm^2. The 1-sec peak photon flux measured starting from T0+2.0 s in the 8-1000 keV band is 2.0 +/- 0.3 ph/s/cm^2. The temporal and spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."