{
  "bibcode": "2020GCN.28985....1D",
  "body": "S. Dichiara (NASA/GSFC/UMCP), C. Gronwall (PSU),\nS. Laha (GSFC/UMBC/CRESST), A. Y. Lien (GSFC/UMBC),\nF. E. Marshall (NASA/GSFC), K. L. Page (U Leicester) and\nM. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 06:52:27 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 201203A (trigger=1010946).  \nSwift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 38.080, -26.538 which is \n   RA(J2000) = 02h 32m 19s\n   Dec(J2000) = -26d 32' 14\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a complex\nstructure with a duration of about 20 sec.  The peak count rate\nwas ~600 counts/sec (15-350 keV), at ~0 sec after the trigger. \n\nThe XRT began observing the field at 06:54:27.2 UT, 120.0 seconds after\nthe BAT trigger. No source was detected in the 2.5-s promptly available\nimage. We are waiting for the full dataset to detect and localise the\nXRT counterpart. \n\nUVOT took a finding chart exposure of  68 seconds with the White filter\nstarting 123 seconds after the BAT trigger. No credible afterglow candidate has\nbeen found in the initial data products. The 2.7'x2.7' sub-image covers 25% of\nthe BAT error circle. The typical 3-sigma upper limit has been about 19.6 mag. \nThe 8'x8' region for the list of sources generated on-board covers 100% of the\nBAT error circle. The list of sources is typically complete to about 18 mag. No\ncorrection has been made for the expected extinction corresponding to E(B-V) of\n0.02. \n\nBurst Advocate for this burst is S. Dichiara (dichiara AT umd.edu). \nPlease contact the BA by email if you require additional information\nregarding Swift followup of this burst. In extremely urgent cases, after\ntrying the Burst Advocate, you can contact the Swift PI by phone (see\nSwift TOO web site for information: http://www.swift.psu.edu/)",
  "circularId": 28985,
  "createdOn": 1606979400000,
  "email": "klp5@leicester.ac.uk",
  "subject": "GRB 201203A: Swift detection of a burst",
  "submitter": "Kim Page at U.of Leicester  <klp5@leicester.ac.uk>",
  "eventId": "GRB 201203A"
}