{
  "bibcode": "2019GCN.24918....1C",
  "body": "J. R. Cummings (CPI), S. D. Barthelmy (GSFC),  H. A. Krimm (NSF),\nA. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), F. Marshall (GSFC),\nD. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU),\nT. N. Ukwatta (LANL) (i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+50 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 190630B (trigger #912102)\n(Krimm, et al., GCN Circ. 24913).  The BAT ground-calculated position is\nRA, Dec = 223.729, 41.528 deg which is \n  RA(J2000)  =  14h 54m 55.0s \n  Dec(J2000) = +41d 31' 42.4\" \nwith an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 100%.\n\nThe mask-weighted light curve shows a single, weak pulse with a FRED-like\nshape, starting from T-3 sec, peaking at T+1 sec and fading to background by\nT+6 sec.  We note that data is available until approximately T+250 sec.  However,\nafter T+50 sec, the background cannot be properly subtracted due to high \nbackground levels arising from Swift���s entry into the SAA.  Therefore we only\nuse data prior to T+50 sec for analysis.  The raw light curve shows no sign of any\nburst activity after the initial pulse.  T90 (15-350 keV) is 5.6 +- 0.9 sec \n(estimated error including systematics).\n\nThe time-averaged spectrum from T-1.7 to T+4.7 sec is best fit by a simple\npower-law model.  The power law index of the time-averaged spectrum is\n1.36 +- 0.24.  The fluence in the 15-150 keV band is 2.8 +- 0.4 x 10^-7 erg/cm2.\nThe 1-sec peak photon flux measured from T-0.19 sec in the 15-150 keV band\nis 1.1 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence\nlevel. \n\nIn the initial circular for GRB 190630B (Krimm, et al., GCN Circ. 24913), this event\nwas reported as a possible burst.   After the more complete analysis carried out here,\nwe conclude that Swift trigger 912102 is indeed a GRB.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/912102/BA/",
  "circularId": 24918,
  "createdOn": 1561910470000,
  "email": "hkrimm@nsf.gov",
  "subject": "GRB 190630B, Swift-BAT refined analysis",
  "submitter": "Hans Krimm at NSF/NASA-GSFC  <hkrimm@nsf.gov>",
  "eventId": "GRB 190630B"
}