TITLE: GCN CIRCULAR NUMBER: 13096 SUBJECT: GRB 120324A: Swift-BAT refined analysis DATE: 12/03/24 14:25:10 GMT FROM: Scott Barthelmy at NASA/GSFC J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU), B.-B. Zhang (PSU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 120324A (trigger #518507) (Zhang, et al., GCN Circ. 13090). The BAT ground-calculated position is RA, Dec = 291.081, 24.140 deg, which is RA(J2000) = 19h 24m 19.5s Dec(J2000) = +24d 08' 23.6" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 82%. The mask-weighted light curve shows many overlapping peaks starting at ~T-190 sec with a weak precursor peak, the main peak at ~T+33 sec, and ending at ~T+180 sec (and possible as long as ~T+330 sec at the 2-sigma level). T90 (15-350 keV) is 118 +- 10 sec (estimated error including systematics). The time-averaged spectrum from T-150.5 to T+142.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.34 +- 0.04. The fluence in the 15-150 keV band is 1.01 +- 0.03 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from T+33.68 sec in the 15-150 keV band is 5.9 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/518507/BA/