{
  "bibcode": "2017GCN.20654....1P",
  "body": "D. M. Palmer (LANL), S. D. Barthelmy (GSFC),\nJ. R. Cummings (CPI), N. Gehrels (GSFC),\nH. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC),\nC. B. Markwardt (GSFC), T. Sakamoto (AGU),\nM. H. Siegel (PSU), M. Stamatikos (OSU),\nT. N. Ukwatta (LANL) (i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 170208B (trigger #737463)\n(Siegel et al., GCN Circ. 20632).  The BAT ground-calculated position is\nRA, Dec = 127.145, -9.027 deg which is\n   RA(J2000)  =  08h 28m 34.7s\n   Dec(J2000) = -09d 01' 36.1\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 100%.\n\nThe mask-weighted light curve shows a bright pulse structure with\nseveral overlapping peaks that starts at ~T-5 s and ends at ~T+15 s,\nfollowed by a weaker pulse from ~T+100 s to ~T+160 s. There are also some\nweak emissions that start at ~T-20 s, prior to the first bright pulse. The short\nspike with duration of ~ 4 ms seen in 15-25 keV at ~T+191.3 s is due to\ninstrumental noise. T90 (15-350 keV) is 128.07 +- 5.75 sec (estimated error\nincluding systematics).\n\nThe time-averaged spectrum from T-18.20 to T+159.30 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index 1.18 +- 0.21,\nand Epeak of 97.8 +- 27.4 keV (chi squared 57.4 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 6.1 +- 0.2 x 10^-6 erg/cm2\nand the 1-sec peak flux measured from T+0.42 sec in the 15-150 keV band is\n8.4 +- 0.2 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 1.62 +- 0.05 (chi squared 71.7 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/737463/BA/",
  "circularId": 20654,
  "createdOn": 1486680928000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "GRB 170208B: Swift-BAT refined analysis",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "GRB 170208B"
}