{
  "bibcode": "2022GCN.31707....1B",
  "body": "S. D. Barthelmy (GSFC), R. Caputo (GSFC)\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nA. Y. Lien (U Tampa), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), T. Parsotan (GSFC/UMBC),\nT. Sakamoto (AGU), M. Stamatikos (OSU)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+963 sec from the recent telemetry\ndownlink,\nwe report further analysis of BAT GRB 220306B (trigger #1095288)\n(Caputo et al., GCN Circ. 31697).  The BAT ground-calculated position is\nRA, Dec = 5.380, 71.384 deg which is\n   RA(J2000)  =  00h 21m 31.3s\n   Dec(J2000) = +71d 23' 04.1\"\nwith an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 78%.\n\nThe mask-weighted light curve shows a single-peaked structure that starts\nat ~T-2 s, peaks at ~T0, and ends at ~T+12 s. T90 (15-350 keV) is\n12.34 +- 3.24 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-1.82 to T+11.66 sec is best fit by a\nsimple\npower-law model.  The power law index of the time-averaged spectrum is\n1.30 +- 0.20.  The fluence in the 15-150 keV band is 6.0 +- 0.7 x 10^-7\nerg/cm2.\nThe 1-sec peak photon flux measured from T-0.05 sec in the 15-150 keV band\nis 2.3 +- 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/1095288/BA/",
  "circularId": 31707,
  "createdOn": 1646684524000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 220306B: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 220306B"
}