{
  "bibcode": "2021GCN.29810....1M",
  "body": "C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), H. A. Krimm (NSF),\nS. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC),\nD. M. Palmer (LANL), T. Sakamoto (AGU),\nT. Sbarrato (INAF-OAB), M. Stamatikos (OSU),\nT. N. Ukwatta (LANL) (i.e. the Swift-BAT team):\n\nUsing the data set from T-60 to T+243 sec from the recent telemetry\ndownlink, we report further analysis of BAT GRB 210411C (trigger #1042398)\n(Sbarrato et al., GCN Circ. 29794).  The BAT ground-calculated position is\nRA, Dec = 296.601, -39.399 deg which is\n   RA(J2000)  =  19h 46m 24.2s\n   Dec(J2000) = -39d 23' 57.8\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 79%.\n\nThe mask-weighted light curve shows a multi-peaked structure that\nstarts at ~T0 and ends at ~T+17 s. The two major peaks occur at ~T+4 s\nand ~T+11 s, respectively. T90 (15-350 keV) is 12.80 +- 0.60 sec\n(estimated error including systematics).\n\nThe time-averaged spectrum from T-0.45 to T+14.44 sec is best fit by a\npower law\nwith an exponential cutoff.  This fit gives a photon index 1.60 +- 0.40,\nand Epeak of 14.8 +- 10.8 keV (chi squared 51.24 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 1.2 +- 0.1 x 10^-6 erg/cm2\nand the 1-sec peak flux measured from T+3.87 sec in the 15-150 keV band is\n4.8 +- 0.3 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 2.62 +- 0.09 (chi squared 68.87 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/1042398/BA/",
  "circularId": 29810,
  "createdOn": 1618264190000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 210411C: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 210411C"
}