{
  "bibcode": "2021GCN.29467....1L",
  "body": "A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC),  H. A. Krimm (NSF),\nS. Laha (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Sakamoto (AGU), M. 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 210210A (trigger #1031728)\n(Laha, et al., GCN Circ. 29444).  The BAT ground-calculated position is\nRA, Dec = 262.764, 14.657 deg which is \n  RA(J2000)  =  17h 31m 03.4s \n  Dec(J2000) = +14d 39' 26.8\" \nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 43%.\n\nThe mask-weighted light curve shows a double-peaked structure running\napproximately from T-1 sec to T+7 sec.  The first pulse peaks close to T+0 sec\nand the second pulse peaks at T+4.5 sec.  T90 (15-350 keV) is 6.60 +- 0.59 sec \n(estimated error including systematics).\n\nThe time-averaged spectrum from T-0.75 to T+6.93 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index 1.53 +- 0.58, \nand Epeak of 19.9 +- 13.9 keV (chi squared 44.33 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 9.8 +- 0.8 x 10^-7 erg/cm2\nand the 1-sec peak flux measured from T+4.21 sec in the 15-150 keV band is\n7.0 +- 0.5 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 2.46 +- 0.12 (chi squared 53.94 for 57 d.o.f.).  All the quoted errors\nare at the 90% confidence level. \n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1031728/BA/",
  "circularId": 29467,
  "createdOn": 1612996350000,
  "email": "hkrimm@nsf.gov",
  "subject": "GRB 210210A: Swift-BAT refined analysis",
  "submitter": "Hans Krimm at NSF/NASA-GSFC  <hkrimm@nsf.gov>",
  "eventId": "GRB 210210A"
}