{
  "bibcode": "2021GCN.29897....1B",
  "body": "S. D. Barthelmy (GSFC), J. R. Cummings (CPI),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), T. Sakamoto (AGU),\nM. Stamatikos (OSU), T. N. Ukwatta (LANL)\n(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 210422A (trigger #1044678)\n(Troja et al., GCN Circ. 29886).  The BAT ground-calculated position is\nRA, Dec = 21.077, 42.100 deg which is\n   RA(J2000)  =  01h 24m 18.6s\n   Dec(J2000) = +42d 05' 58.2\"\nwith an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 53%.\n\nThe BAT light curve showed a complex structure with a duration of about ~30 sec.\nT90 (15-350 keV) is 39.00 +- 7.28 sec (estimated error including systematics).\n\nThe time-averaged spectrum from -34.40 s to -20.56 s and -19.40s to 7.59 s is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.70 +- 0.22.  The fluence in the 15-150 keV band is 7.2 +- 1.1 x 10^-07 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.59 sec in the 15-150 keV band\nis 1.3 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel.\n\nThe results of the batgrbproduct analysis are available at\nhttps://swift.gsfc.nasa.gov/results/BATbursts/1044678/bascript/top.html",
  "circularId": 29897,
  "createdOn": 1619308801000,
  "email": "sibasish.laha@nasa.gov",
  "eventId": "GRB 210422A",
  "subject": "GRB 210422A: Swift-BAT refined analysis",
  "submitter": "Sibasish Laha at GSFC  <sibasish.laha@nasa.gov>"
}