TITLE: GCN CIRCULAR NUMBER: 36510 SUBJECT: GRB 240516A: Swift-BAT refined analysis DATE: 24/05/17 21:45:50 GMT FROM: Amy <yarleen@gmail.com> S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC), R. Gupta (GSFC), H. A. Krimm (NSF), A. Y. Lien (U Tampa), 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-200 to T+200 sec from the recent telemetry downlink, we report further analysis of BAT GRB 240516A (trigger #1228797) (Parsotan et al., GCN Circ. 36493). The BAT ground-calculated position is RA, Dec = 212.784, -63.495 deg which is RA(J2000) = 14h 11m 08.3s Dec(J2000) = -63d 29' 41.7" with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 45%. The mask-weighted light curve shows a single-peaked, FRED-like structure that starts at ~T-5 s, peaks at ~T-2 s, and ends at ~T+15 s. In addition, there are some weak tail emissions that last till ~T+110 s. T90 (15-350 keV) is 94.69 +- 34.00 sec (estimated error including systematics). The time-averaged spectrum from T-4.75 to T+112.50 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.09 +- 0.19. The fluence in the 15-150 keV band is 2.0 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-2.20 sec in the 15-150 keV band is 1.1 +- 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/1228797 View this GCN Circular online at https://gcn.nasa.gov/circulars/36510. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...