TITLE: GCN CIRCULAR NUMBER: 43507 SUBJECT: GRB 260122B: Swift-BAT refined analysis DATE: 26/01/24 00:54:15 GMT FROM: Amy <yarleen@gmail.com> D. M. Palmer (LANL), S. D. Barthelmy (GSFC), R. Gupta (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), A. Mei (INAF-OAB), M. J. Moss (GSFC), T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), T. Sakamoto (AGU) (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 260122B (trigger #1443066) (Mei et al., GCN Circ. 43502). The ground analysis confirms that this event is indeed a GRB and not due to background fluctuations (Mei et al., GCN Circ. 43502). The BAT ground-calculated position is RA, Dec = 336.096, -59.176 deg which is RA(J2000) = 22h 24m 22.9s Dec(J2000) = -59d 10' 32.1" with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 57%. The mask-weighted light curve shows a single-pulse structure that starts ~T-1 s, peaks at ~T+9 s, and ends at ~T+20 s. T90 (15-350 keV) is 16.59 +- 3.89 sec (estimated error including systematics). The time-averaged spectrum from T+0.23 to T+19.51 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.34 +- 0.17. The fluence in the 15-150 keV band is 1.0 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+8.46 sec in the 15-150 keV band is 1.6 +- 0.3 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/1443066 View this GCN Circular online at https://gcn.nasa.gov/circulars/43507. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...