{
  "bibcode": "2022GCN.31981....1B",
  "body": "S. D. Barthelmy (GSFC), E. Ambrosi (INAF-IASFPA),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nA. Y. Lien (U Tampa), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), T. Parsotan (GSFC/UMBC),\nT. Sakamoto (AGU), M. Stamatikos (OSU)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-204 to T+843 sec from the recent telemetry\ndownlink, we report further analysis of BAT GRB 220430A (trigger #1104692)\n(Ambrosi et al., GCN Circ. 31972).  The BAT ground-calculated position is\nRA, Dec = 97.616, 9.547 deg which is\n   RA(J2000)  =  06h 30m 27.9s\n   Dec(J2000) = +09d 32' 50.1\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 100%.\n\nThe mask-weighted light curve shows two major pulse emissions. The first\none starts at ~T-7 s, peaks at ~T+20 s, and ends at ~T+30 s. It is\nfollowed by another larger pulse with several peaks. The largest peak\noccurs at ~T+42 s. The burst emission ends at ~T+100 s. T90 (15-350 keV)\nis 43.10 +- 0.57 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-6.53 to T+94.36 sec is best fit by\na simple power-law model.  The power law index of the time-averaged\nspectrum is 1.24 +- 0.02.  The fluence in the 15-150 keV band is\n4.4 +- 0.05 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from\nT+42.00 sec in the 15-150 keV band is 29.6 +- 0.6 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/1104692/BA/",
  "circularId": 31981,
  "createdOn": 1651418188000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 220430A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 220430A"
}