{
  "bibcode": "2022GCN.31369....1M",
  "body": "C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),  H. A. Krimm (NSF), S. Laha\n(GSFC/UMBC), A. Y. Lien (U Tampa), D. M. Palmer (LANL), T. Parsotan\n(GSFC/UMBC), T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT\nteam):\n\n\n\nUsing the data set from T-240 to T+962 sec from the recent telemetry\ndownlink, we report further analysis of BAT GRB 220101A (trigger #1091527)\n(Tohuvavohu et al. GCN 31347).  The BAT ground-calculated position is RA,\nDec = 1.360, 31.758 deg which is\n\n   RA(J2000)  =  00h 05m 26.4s\n\n   Dec(J2000) = +31d 45' 28.3\"\n\nwith an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment). The\npartial coding was 64%.\n\n\n\nThe BAT lightcurve shows a complex lightcurve extending to at least T+170\nwith a peak of 7000 counts/s (15-350 keV), at ~89 sec after the trigger.\nT90 (15-350 keV) is 173.36 +- 12.76 sec (estimated error including\nsystematics).\n\n\n\nThe time-averaged spectrum from T-58.08 to T+259.11 sec is best fit by a\npower law with an exponential cutoff.  This fit gives a photon index 1.13\n+- 0.13,  and Epeak of 249.1 +- 161.8 keV (chi squared 42.49 for 56\nd.o.f.).  For this model the total fluence in the 15-150 keV band is 2.5 +-\n0.0 x 10^-05 erg/cm2 and the 1-sec peak flux measured from T+89.07 sec in\nthe 15-150 keV band is 7.3 +- 0.3 ph/cm2/sec.  A fit to a simple power law\ngives a photon index of 1.34 +- 0.03 (chi squared 50.91 for 57 d.o.f.).  All\nthe quoted errors are at the 90% confidence level.\n\n\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1091527/BA/",
  "circularId": 31369,
  "createdOn": 1641133230000,
  "email": "parsotat@umbc.edu",
  "subject": "GRB 220101A: Swift-BAT refined analysis",
  "submitter": "Tyler Parsotan at UMBC/GSFC/CRESST II  <parsotat@umbc.edu>",
  "eventId": "GRB 220101A"
}