{
  "bibcode": "2021GCN.30554....1S",
  "body": "T. Sakamoto (AGU), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), E. Sonbas (Adiyaman Univ.),\nM. Stamatikos (OSU), T. N. Ukwatta (LANL)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+200 sec from the recent telemetry\ndownlink, we report further analysis of BAT GRB 210730A (trigger #1062150)\n(Sonbas et al., GCN Circ. 30548).  The BAT ground-calculated position is\nRA, Dec = 149.570, 69.703 deg which is\n   RA(J2000)  =  09h 58m 16.8s\n   Dec(J2000) = +69d 42' 12.4\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 55%.\n\nThe mask-weighted light curve shows a single-peaked structure that\nstarts at ~T-0.5, peaks at ~T+0.5, and ends at ~T+5. T90 (15-350 keV)\nis 3.86 +- 0.66 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.32 to T+5.01 sec is best fit by\na simple power-law model.  The power law index of the time-averaged\nspectrum is 1.41 +- 0.11.  The fluence in the 15-150 keV band\nis 1.3 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured\nfrom T+0.17 sec in the 15-150 keV band is 7.1 +- 0.5 ph/cm2/sec.\nAll 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/1062150/BA/",
  "circularId": 30554,
  "createdOn": 1627664735000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 210730A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 210730A"
}