{
  "bibcode": "2015GCN.17774....1B",
  "body": "W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), \nN. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), \nC. B. Markwardt (GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), \nT. Sakamoto (AGU), M. Stamatikos (OSU), T. 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 150428A (trigger #639275) \n(Page, et al., GCN Circ. 17765).  The BAT ground-calculated position is \nRA, Dec = 188.539, 6.967 deg which is \n  RA(J2000) =   12h 34m 09.3s \n  Dec(J2000) = +06d 58' 00.8��� \nwith an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). \nThe partial coding was 16%. \n\nThe mask-weighted light curve shows a multi-peaked structure that starts at \n~ T-40 sec and ends at ~ T+60 sec.  T90 (15-350 keV) is 53.2 +- 15.1 sec \n(estimated error including systematics). \n\nThe time-averaged spectrum from T-39.0 to T+38.6 sec is best fit by a simple \npower-law model. The power law index of the time-averaged spectrum is 1.28 +- 0.09. \nThe fluence in the 15-150 keV band is 6.3 +- 0.3 x 10^-6 erg/cm2.  The 1-sec peak \nphoton flux measured from T+17.4 sec in the 15-150 keV band is 3.0 +- 0.5 ph/cm2/sec.  \nAll the quoted errors are at the 90% confidence level.  \n\nThe results of the batgrbproduct analysis are available at \nhttp://gcn.gsfc.nasa.gov/notices_s/639275/BA/",
  "circularId": 17774,
  "createdOn": 1430225381000,
  "email": "tsakamoto@phys.aoyama.ac.jp",
  "subject": "GRB 150428A: Swift-BAT refined analysis",
  "submitter": "Takanori Sakamoto at AGU  <tsakamoto@phys.aoyama.ac.jp>",
  "eventId": "GRB 150428A"
}