{
  "bibcode": "2019GCN.26162....1U",
  "body": "T. N. Ukwatta (LANL) E. Ambrosi (INAF-IASFPA), S. D. Barthelmy (GSFC), \nJ. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Sakamoto (AGU), M. Stamatikos (OSU), (i.e. the Swift-BAT team):\n\nUsing the data set from T-119 to T+183 sec from recent telemetry downlinks,\nwe report further analysis of the BAT detection of a burst from SGR 1935+2154\n(trigger #933083)  (Ambrosi, et al., GCN Circ. 26153).  The BAT\nground-calculated position is RA, Dec = 293.741, 21.901 deg which is \n  RA(J2000)  =  19h 34m 57.8s \n  Dec(J2000) = +21d 54' 02.7\" \nwith an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 85%.\n\nThe lightcurve consists of a single peak with a total duration of ~0.04 sec.\nT90 (15-350 keV) is 0.03 +- 0.01 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.00 to T+0.04 sec fit by a simple\npower-law model shows the power law index of 2.67 +- 0.31 (chi squared 38.4 for 57 d.o.f.).\nThe fluence in the 15-150 keV band is 2.4 +- 0.4 x 10^-8 erg/cm2.\nThe 1-sec peak photon flux measured from T-0.48 sec in the 15-150 keV band\nis 0.8 +- 0.2 ph/cm2/sec.\n\nA single blackbody fit to the time-averaged spectrum shows the blackbody\ntemperature of 6.16 +- 0.86 keV (chi squared 36.86 for 57 d.o.f.).\nA thermal bremsstrahlung model fit shows the temperature of 24.16 +- 7.80 keV\n(chi squared 36.5 for 57 d.o.f.).  A double blackbody fit shows the lower temperature\nof 5.78 +0.95 keV and the higher temperature of 52.64 -7.00 keV\n(chi squared 30.61 for 55 d.o.f.).  All 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/933083/BA/",
  "circularId": 26162,
  "createdOn": 1572880018000,
  "email": "scott@milkyway.gsfc.nasa.gov",
  "subject": "SGR 1935+2154: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@milkyway.gsfc.nasa.gov>",
  "eventId": "SGR 1935+2154"
}