TITLE: GCN CIRCULAR NUMBER: 36566 SUBJECT: GRB 240529A: Swift-BAT refined analysis DATE: 24/05/29 17:19:11 GMT FROM: Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov> C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), R. Gupta (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), 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 240529A (trigger #1231488) (Eyles-Ferris et al., GCN 36556). The BAT ground-calculated position is RA, Dec = 335.341, 51.557 deg which is RA(J2000) = 22h 21m 22.0s Dec(J2000) = +51d 33' 25.2" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 26%. The mask weighted lightcurve shows a complex lightcurve structure with a relatively gradual rise to the peak at trigger time and multiple pulses present at late times, at t ~30 and ~50 sec after the trigger time. T90 (15-350 keV) is 160.67 +- 14.52 sec (estimated error including systematics). The time-averaged spectrum from -74.8 to 226.4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.68 +- 0.04. The fluence in the 15-150 keV band is 2.1 +- 0.0 x 10^-05 erg/cm2. The 1-sec peak photon flux measured from T+0.17 sec in the 15-150 keV band is 7.7 +- 0.6 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/1231488 View this GCN Circular online at https://gcn.nasa.gov/circulars/36566. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...