TITLE: GCN CIRCULAR NUMBER: 39012 SUBJECT: GRB 250114A: Swift-BAT refined analysis DATE: 25/01/22 13:51:00 GMT FROM: Mike Moss at NASA GSFC <mikejmoss3@gmail.com> A. Y. Lien (U Tampa), S. D. Barthelmy (GSFC), R. Gupta (GSFC), N. J. Klingler (GSFC/UMBC/CRESSTII), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), C. B. Markwardt (GSFC), M. J. Moss (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 250114A (trigger #1281241) (N. J. Klingler, et al., GCN Circ. 38927). The BAT ground-calculated position is RA, Dec = 166.572, -15.129 deg which is RA(J2000) = 11h 06m 17.3s Dec(J2000) = -15d 07' 44.5" with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 21%. The mask-weighted light curves display several pulses between T0 and T0+60 sec. There are also two additional pulses of emission starting around T0+130 and T0+260. T90 (15-350 keV) is 293.89 +- 13.45 sec (estimated error including systematics). The time-averaged spectrum from T-8.528 to T+305.988 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.39 +- 0.62, and Epeak of 50.9 +- 6.3 keV (chi squared 44.16 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 3.6 +- 0.3 x 10^-06 erg/cm2 and the 1-sec peak flux measured from T+1.72 sec in the 15-150 keV band is 1.5 +- 0.4 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.84 +- 0.11 (chi squared 66.05 for 57 d.o.f.). 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/1281241 View this GCN Circular online at https://gcn.nasa.gov/circulars/39012. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...