{
  "bibcode": "2021GCN.30207....1K",
  "body": "H. A. Krimm (NSF), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), S. Laha (GSFC/UMBC),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nK. L. Page (U Leicester), D. M. Palmer (LANL),\nT. Sakamoto (AGU), M. Stamatikos (OSU),\nT. N. Ukwatta (LANL) (i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+962 sec from the recent telemetry\ndownlink, we report further analysis of BAT GRB 210610B (trigger #1054681)\n(Page et al., GCN Circ. 30170).  The BAT ground-calculated position is\nRA, Dec = 243.929, 14.398 deg which is\n   RA(J2000)  =  16h 15m 42.8s\n   Dec(J2000) = +14d 23' 54.5\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 24%.\n\nThe mask-weighted light curve shows several overlapping pulses that\nstart at ~T-12 and end at ~T+140 s. The main peak occurs at ~T+8 s.\nT90 (15-350 keV) is 69.38 +- 2.53 sec (estimated error including\nsystematics).\n\nThe time-averaged spectrum from T-12.04 to T+142.47 sec is best fit by\na power law with an exponential cutoff.  This fit gives a photon\nindex 0.98 +- 0.11, and Epeak of 339.3 +- 218.6 keV (chi squared 27.43\nfor 56 d.o.f.).  For this model the total fluence in the 15-150 keV band\nis 3.6 +- 0.1 x 10^-5 erg/cm2 and the 1-sec peak flux measured from\nT+7.95 sec in the 15-150 keV band is 13.5 +- 0.7 ph/cm2/sec.  A fit to\na simple power law gives a photon index of 1.17 +- 0.03 (chi squared 36.54\nfor 57 d.o.f.).  All the quoted errors are at the 90% confidence level.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1054681/BA/",
  "circularId": 30207,
  "createdOn": 1623438526000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 210610B: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 210610B"
}