{
  "bibcode": "2023GCN.33214....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),\nT. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),\nM. Stamatikos (OSU), M. A. Williams (PSU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+963 sec from the recent telemetry\ndownlink,\nwe report further analysis of BAT GRB 230123A (trigger #1150429)\n(Williams et al., GCN Circ. 33206).  The BAT ground-calculated position is\nRA, Dec = 40.905, -65.661 deg which is\n   RA(J2000)  =  02h 43m 37.3s\n   Dec(J2000) = -65d 39' 39.9\"\nwith an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 88%.\n\nThe mask-weighted light curve shows a single-peaked structure\nthat starts at ~T-2 s, peaks at ~T+1, and ends at ~T+6 s.\nT90 (15-350 keV) is 5.37 +- 1.03 sec (estimated error including\nsystematics).\n\nThe time-averaged spectrum from T-1.25 to T+4.75 sec is best fit\nby a simple power-law model.  The power law index of the time-averaged\nspectrum is 2.06 +- 0.24.  The fluence in the 15-150 keV band\nis 2.7 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from\nT+0.12 sec in the 15-150 keV band is 1.1 +- 0.2 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/1150429/BA/",
  "circularId": 33214,
  "createdOn": 1674536924000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 230123A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 230123A"
}