{
  "bibcode": "2020GCN.26780....1L",
  "body": "S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI),\nH. A. Krimm (NSF), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nK. Page (UL), D. M. Palmer (LANL), T. Sakamoto (AGU),\nM. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):\n\nUsing the data set from T-60 to T+243 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 200115A (trigger #949361)\n(Page, et al., GCN Circ. 26771).  The BAT ground-calculated position is\nRA, Dec = 56.453, 5.607 deg, which is\n   RA(J2000)  =  03h 45m 48.7s\n   Dec(J2000) = +05d 36' 26.0\"\nwith an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 82%.\n\nThe mask-weighted light curve starts before T-50 sec, picking up at T-30 sec,\ncontinued increasing until the peak at T+100 sec, a couple weak following peaks,\nand having weak and flat emission out past the end of data at T+240 sec.\nT90 (15-350 keV) is 158.4 +- 32.6 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-40.29 to T+233.12 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index 1.29 +- 0.24,   \nand Epeak of 75.0 +- 17.5 keV (chi squared 40.88 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 1.0 +- 0.0 x 10^-5 erg/cm2\nand the 1-sec peak flux measured from T+99.75 sec in the 15-150 keV band is\n3.6 +- 0.3 ph/cm2/sec.  A fit to a simple power law gives a photon index  \nof 1.77 +- 0.06 (chi squared 53.76 for 57 d.o.f.).  All the quoted errors \nare at the 90% confidence level.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/949361/BA/",
  "circularId": 26780,
  "createdOn": 1579135311000,
  "email": "scott@milkyway.gsfc.nasa.gov",
  "subject": "GRB 200115A: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 200115A"
}