{
  "bibcode": "2018GCN.22533....1K",
  "body": "H. A. Krimm (NSF/USRA), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), A. Y. Lien (GSFC/UMBC),\nC. B. Markwardt (GSFC), J. P. Norris (BSU),\nD. M. Palmer (LANL), T. Sakamoto (AGU),\nE. Sonbas (Adiyaman Univ.), M. Stamatikos (OSU),\nT. N. Ukwatta (LANL) (i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 180324A (trigger #817345)\n(Sonbas et al., GCN Circ. 22524).  The BAT ground-calculated position is\nRA, Dec = 76.581, 56.744 deg which is\n  RA(J2000)  =  05h 06m 19.4s\n  Dec(J2000) = +56d 44' 36.8\"\nwith an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 78%.\n\nThe mask-weighted light curve shows a small precursor at ~T-5 s, followed\nby the main pulse that starts at ~T-0.2, peaks at ~T+0.3 s, and ends at ~T+1 s.\nThere is also some weak emission that lasts till ~T+4 s. T90 (15-350 keV)\nis 7.2 +- 1.3 sec (estimated error including systematics).\n\nThe lag analysis for the main pulse finds a lag of 48 +- 18 ms for the\n100-350 keV to 25-100 keV band. This value is consistent with that of a\nlong GRB. In addition, no extended emission is found after ~T+4 s.\n\nThe time-averaged spectrum from T-5.4 to T+3.7 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.45 +- 0.14.  The fluence in the 15-150 keV band is 5.6 +- 0.5 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T-0.13 sec in the 15-150 keV band\nis 4.4 +- 0.3 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/817345/BA/",
  "circularId": 22533,
  "createdOn": 1521943578000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 180324A, Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 180324A"
}