{
  "bibcode": "2017GCN.21981....1B",
  "body": "S. D. Barthelmy (GSFC), J. K. Cannizzo (NASA/UMBC),\nJ. R. Cummings (CPI), H. A. Krimm (NSF/USRA),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),\nJ. P. Norris (BSU), D. M. Palmer (LANL),\nT. Sakamoto (AGU), M. Stamatikos (OSU),\nT. N. Ukwatta (LANL) (i.e. the Swift-BAT team):\n\nUsing the data set from T-239 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 171007A (trigger #777215)\n(Cannizzo et al., GCN Circ. 21976).  The BAT ground-calculated position is\nRA, Dec = 135.635, 42.930 deg which is\n  RA(J2000)  =  09h 02m 32.5s\n  Dec(J2000) = +42d 55' 47.4\"\nwith an uncertainty of 3.6 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 100%.\n\nThe mask-weighted light curve shows a short spike that start at ~ T-0.1 s and\nends at ~ T+2.9 s. There is some weak emission lasting till ~T+80 s.\nT90 (15-350 keV) is 105 +- 45 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.08 to T+107.92 sec is best fit by a simple\npower-law model. The power law index of the time-averaged spectrum is\n1.38 +- 0.52.  The fluence in the 15-150 keV band is 2.9 +- 1.1 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.92 sec in the 15-150 keV band\nis 0.4 +- 0.1 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel.\n\nAlthough the burst is weak and the short spike is ~ 3 s, the structure of the burst\nshows similarity to those of short GRBs with extended emission. We thus perform\nfurther analysis on the short spike and the tail emission. The spectrum of the short\nspike from T-0.08 to T+2.92 sec is best fit by a simple power-law model, with\npower-law index of 0.83 +- 0.35 and fluence (15-150 keV) of 1.0 +- 0.2 x 10^-7 erg/cm2.\nThe spectrum of the tail emission from T+2.92 to T+107.92 sec is best fit by a simple\npower-law model, with power-law index of 1.67 +- 0.73 and fluence (15-150 keV) of\n1.8 +- 1.0 x 10^-7 erg/cm2. These values are consistent with those of short GRBs with\nextended emission (Lien & Sakamoto et al. 2016).\n\nThe lag analysis is unconstrained due to the weakness of this burst.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/777215/BA/",
  "circularId": 21981,
  "createdOn": 1507481852000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 171007A: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 171007A"
}