TITLE: GCN CIRCULAR NUMBER: 36255 SUBJECT: GRB 240419A: Swift-BAT refined analysis DATE: 24/04/23 13:00:27 GMT FROM: Mike Moss at NASA GSFC mikejmoss3@gmail.com
T. Parsotan (GSFC), S. D. Barthelmy (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), T. Sakamoto (AGU), M. H. Siegel (PSU) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 240419A (trigger #1222955) (Siegel, et al., GCN Circ. 36169). The BAT ground-calculated position is RA, Dec = 94.505, -44.964 deg which is RA(J2000) = 06h 18m 01.3s Dec(J2000) = -44d 57' 50.2" with an uncertainty of 3.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 89%.
The mask-weighted light curve shows two dim pulses at T0-7 s and T0+0 s, respectively. The T90 (15-350 keV) is 3.00 +- 1.41 sec (estimated error including systematics).
The time-averaged spectrum from T-0.43 to T+2.57 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.71 +- 0.38. The fluence in the 15-150 keV band is 8.4 +- 2.1 x 10^-08 erg/cm2. The 1-sec peak photon flux measured from T+0.57 sec in the 15-150 keV band is 0.6 +- 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/1222955
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