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GCN Circular 36897

Subject

GRB 240712A: Swift-BAT refined analysis

Date

2024-07-17T20:40:58Z (4 months ago)

From

Sibasish Laha at GSFC <sibasish.laha@nasa.gov>

Via

T. Parsotan (GSFC), S. D. Barthelmy (GSFC),
R. Gupta (GSFC), H. A. Krimm (NSF),
S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),
C. B. Markwardt (GSFC), M. J. Moss (GSFC),
D. M. Palmer (LANL), D. Sadaula (GSFC/UMBC),
T. Sakamoto (AGU)(i.e. the Swift-BAT team):

Using the data set from T-240 to T+962 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 240712A (trigger #1242223)
(Salvaggio et al., GCN Circ. 36851Not found
 
 
). The BAT ground-calculated position is
    RA, Dec = 122.385, -37.093 deg which is
       RA(J2000)  =  08h 09m 32.3s
       Dec(J2000) = -37d 05' 36.3"
with an uncertainty of 2.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 93%.

The BAT light curve shows a complex structure with a duration of ~ 20 sec.
T90 (15-350 keV) is 16.45 +- 4.89 sec (estimated error including systematics).

The time-averaged spectrum from T-4.68 to T+12.59 sec is best fit by a simple power-law model.
The power law index of the time-averaged spectrum is 1.29 +- 0.30.
The fluence in the 15-150 keV band is 2.7 +- 0.5 x 10^-07 erg/cm2.
The 1-sec peak photon flux measured from T+1.24 sec in the 15-150 keV band is 0.5 +- 0.1 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/1242223