{
  "bibcode": "2013GCN.15289....1C",
  "body": "J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),\nE. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),\nA. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Sakamoto (AGU), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC),\nT. N. Ukwatta (MSU)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T0 to T+1699 sec from the recent telemetry downlink,\nwe report further analysis of Swift J1242.9-3530 (formerly cited as GRB 130930A,\nBAT trigger #572489) (Ukwatta, et al., GCN Circ. 15276).  The BAT ground-\ncalculated position is RA, Dec = 190.725, -35.511, which is\nRA (J2000)      12h 42m 53.9s\nDec (J2000)     -35d 30' 40\"\nwith an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 86%.\n\nThe mask-weighted light curve varies slowly over the duration of the observation.\nThe emission appears to extend before and after the observation so we cannot\ndetermine a T90 interval.\n\nThe time-averaged spectrum from T0 to T0+1699 sec is best fit by a simple power-\nlaw model.  The power-law index of the time-averaged spectrum is 1.90 +- 0.18.\nThe fluence in the 15-150 keV band is (3.9 +/- 0.4) x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.00 sec in the 15-150 keV band\nis 0.036 +- 0.004 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel.\n\nThe source is also detected at a similar intensity in ground analysis of an\nearlier observation, from T0-46108 to T0-44561 seconds, but is not detected\nin an observation with a similar pointing from T0-51899 to T0-50201 seconds.\nThe 90% confidence upper limit is 0.2 times the intensity observed later.\nWe note that the location of the source is 27 degrees from the Galactic plane\nand not in the direction of the Galactic center.\n\nThe narrow-field instruments of Swift cannot observe this location until late\nNovember at the earliest due to the proximity of the Sun.\n\nThe data included in the automated analysis covers only T-239 to T+963 seconds.\nThe results of the batgrbproduct automated analysis will be available if the US\ngovernment ever returns to normal operations at\nhttp://gcn.gsfc.nasa.gov/notices_s/572489/BA/",
  "circularId": 15289,
  "createdOn": 1380739397000,
  "email": "james.r.cummings@nasa.gov",
  "subject": "Swift J1242.9-3530, Swift-BAT refined analysis",
  "submitter": "Jay R. Cummings at NASA/GSFC/Swift  <james.r.cummings@nasa.gov>"
}