{
  "bibcode": "2011GCN.12130....1B",
  "body": "S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC),\nE. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),\nC. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC),\nG. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)\n(i.e. the Swift-BAT team):\n \nWe report further analysis of BAT GRB 110709B (triggers #456967 and #456969;\nCummings, et al., GCN Circ. 12122 and Barthelmy, et al., GCN Circ. 12124).\n\nBecause of the interesting nature of this event, we are posting preliminary\nversions of the \"refined\" processing on the two triggers of GRB 110709B.\nThe automated analysis of each trigger is provided separately.  We will likely\npost the final refined analysis later when all of the full data is downlinked,\nand the combined analysis can be performed.\n\nAt present, the first of the two BAT triggers (trigger #456967) consists \nof data from T-61 to T+234 sec.  The second trigger (trigger #456969) consists\nof only a small amount of data from T-11 to T+63 sec.  The two triggers\nare 645 sec apart.\n\nThe BAT ground-calculated position of the first trigger (#456967) is,\nRA, Dec = 164.668, -23.470 deg, which is \n   RA(J2000)  =  10h 58m 40.3s \n   Dec(J2000) = -23d 28' 11.4\" \nwith an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 57%.   The position derived from the second trigger \n(#456969) is RA, Dec = 164.664, -23.500 deg, which is \n   RA(J2000)  =  10h 58m 39.4s \n   Dec(J2000) = -23d 29' 59.6\" \nwith an uncertainty of 3.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 100% (on the BAT bore sight as a result of the\nslew from the first trigger).  The two positions are separated by\n1.8 arcmin.\n\nThe mask-weighted light curve of the first trigger, trigger #456967, \nshows the first peak of the cluster of peaks starting at ~T-30 sec\n(note that the partial downlinked data start only at T-61 sec),\npeaks at ~T+15 sec, and ends at T+130 or T+170 sec.\nT90 (15-350 keV) is 55.6 +- 3.2 sec (estimated error including systematics).\n \nThe time-averaged spectrum of the data for the first trigger, trigger\n#456967, from T-27.4 to T+46.7 sec is best fit by a simple power-law model.\nThe power law index of the time-averaged spectrum is 1.29 +- 0.04.\nThe fluence in the 15-150 keV band is 9.4 +- 0.2 x 10-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+13.59 sec in the 15-150 keV band\nis 3.4 +- 0.3 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel. \n\nThe mask-weighted light curve of the second trigger, #456969, \nshows emission starting some time before the current data set\nstarting at T=21:43:25.4 - 11 sec  and extending beyond the\nT=21:43:25.4 + 63 sec of the partially downlinked data.\n \nThe time-averaged spectrum of the second trigger, #456969, \nfrom T-8.2 to T+52.8 sec is best fit by a power law with an\nexponential cutoff.  This fit gives a photon index 1.08 +- 0.17, \nand Epeak of 171.5 +- 81.8 keV (chi squared 36.6 for 56 d.o.f.).\nA fit to a simple power law gives a photon index of 1.39 +- 0.04\n(chi squared 47.2 for 57 d.o.f.).  All the quoted errors are\nat the 90% confidence level. \n \nThe results of the batgrbproduct analysis are available at\n  Trigger 456967:  http://gcn.gsfc.nasa.gov/notices_s/456967/BA/\n  Trigger 456969:  http://gcn.gsfc.nasa.gov/notices_s/456969/BA/",
  "circularId": 12130,
  "createdOn": 1310262447000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 110709B: Preliminary Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 110709B"
}