TITLE: GCN CIRCULAR NUMBER: 39245 SUBJECT: GRB 250207A: Swift-BAT refined analysis DATE: 25/02/09 00:53:00 GMT FROM: Rahul Gupta at NASA GSFC rahul.gupta@nasa.gov
M. J. Moss (GSFC), S. D. Barthelmy (GSFC), M. Ferro (INAF-OAB), R. Gupta (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), T. Sakamoto (AGU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 250207A (trigger #1287821) (Ferro, et al., GCN Circ. 39182). The BAT ground-calculated position is RA, Dec = 16.097, -12.165 deg which is RA(J2000) = 01h 04m 23.4s Dec(J2000) = -12d 09' 55.0" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 72%.
The masked weighted BAT light curve shows a prominent multi-peaked structure, with the most significant activity occurring within the first 50 seconds after the trigger. T90 (15-350 keV) is 52.54 +- 19.87 sec (estimated error including systematics).
The time-averaged spectrum from T-6.60 to T+100.22 sec is the best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.27 +- 0.08. The fluence in the 15-150 keV band is 3.7 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+7.01 sec in the 15-150 keV band is 2.6 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1287821
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