{
  "bibcode": "2022GCN.31485....1P",
  "body": "D. M. Palmer (LANL), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nA. Y. Lien (U Tampa), C. B. Markwardt (GSFC),\nA. Melandri (INAF-OAB), T. Parsotan (GSFC/UMBC),\nT. Sakamoto (AGU), M. Stamatikos (OSU)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+939 sec from the recent telemetry\ndownlink, we report further analysis of BAT GRB 220117A (trigger #1093592)\n(Melandri et al., GCN Circ. 31466).  The BAT ground-calculated position is\nRA, Dec = 91.590, -28.402 deg which is\n   RA(J2000)  =  06h 06m 21.5s\n   Dec(J2000) = -28d 24' 08.5\"\nwith an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 26%.\n\nThe mask-weighted light curve shows a multi-peaked structure that\nstarts at ~T+15 s and ends at ~T+65 s. The two larger peaks occur\nat ~T+15 s and ~T+44 s, respectively. T90 (15-350 keV) is\n49.81 +- 2.37 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T+14.79 to T+66.14 sec is best fit\nby a simple power-law model.  The power law index of the time-averaged\nspectrum is 1.84 +- 0.18.  The fluence in the 15-150 keV band\nis 1.6 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured\nfrom T+14.81 sec in the 15-150 keV band is 1.9 +- 0.4 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/1093592/BA/",
  "circularId": 31485,
  "createdOn": 1642520131000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 220117A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 220117A"
}