{
  "subject": "GRB 241218A: Swift-BAT refined analysis",
  "submitter": "Mike Moss at NASA GSFC <mikejmoss3@gmail.com>",
  "body": "R. Gupta (GSFC), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nA. Y. Lien (U Tampa), C. B. Markwardt (GSFC),\nM. J. Moss (GSFC), D. M. Palmer (LANL),\nT. Parsotan (GSFC), D. Sadaula (GSFC/UMBC),\nT. Sakamoto (AGU), M. A. Williams (PSU)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-520 to T+962 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 241218A (trigger #1275005)\n(M. A. Williams, et al., GCN Circ. 38601). The BAT ground-calculated position is\nRA, Dec = 185.687, 29.984 deg which is\n   RA(J2000)  =  12h 22m 44.8s\n   Dec(J2000) = +29d 59' 04.2\"\nwith an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 52%.\n\nThe mask-weighted light curve shows a single pulse of emission lasting 40 seconds\nwith a possible second pulse at T+70 seconds.\nThe T90 (15-350 keV) is 23.31 +- 4.19 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-1.82 to T+26.16 sec is best fit by a simple\npower-law model. The power law index of the time-averaged spectrum is\n1.31 +- 0.26.  The fluence in the 15-150 keV band is 5.5 +- 1.0 x 10^-07 erg/cm2.\nThe 1-sec peak photon flux measured from T+16.64 sec in the 15-150 keV band\nis 0.6 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel.\n \nThe results of the batgrbproduct analysis are available at\nhttps://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1275005\n ",
  "bibcode": "2024GCN.38629....1G",
  "createdOn": 1734559340189,
  "format": "text/plain",
  "submittedHow": "web",
  "circularId": 38629,
  "eventId": "GRB 241218A"
}