{
  "bibcode": "2023GCN.33571....1P",
  "body": "K. L. Page (U Leicester), C. Gronwall (PSU), J.D. Gropp (PSU),\nJ. A. Kennea (PSU), M. J. Moss (GWU), D. M. Palmer (LANL),\nT. M. Parsotan (GSFC/UMBC/CRESSTII) and M. H. Siegel (PSU) report on\nbehalf of the Neil Gehrels Swift Observatory Team:\n\nAt 19:58:03 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 230405B (trigger=1163119).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 271.467, -47.070 which is \n   RA(J2000) = 18h 05m 52s\n   Dec(J2000) = -47d 04' 12\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a single-peaked\nstructure with a duration of about 10 sec.  The peak count rate\nwas ~16000 counts/sec (15-350 keV), at ~2 sec after the trigger. \n\nThe XRT began observing the field at 19:59:09.2 UT, 65.7 seconds after\nthe BAT trigger. Using promptly downlinked data we find a bright,\nuncatalogued X-ray source located at RA, Dec 271.44108, -47.06898 which\nis equivalent to:\n   RA(J2000)  = 18h 05m 45.86s\n   Dec(J2000) = -47d 04' 08.3\"\nwith an uncertainty of 3.5 arcseconds (radius, 90% containment). This\nlocation is 63 arcseconds from the BAT onboard position, within the BAT\nerror circle. This position may be improved as more data are received;\nthe latest position is available at https://www.swift.ac.uk/sper.  We\ncannot determine whether the source is fading at the present time. No\nspectrum from the promptly downlinked event data is yet available to\ndetermine the column density. \n\nThe initial flux in the 2.5 s image was 9.19e-10 erg cm^-2 s^-1 (0.2-10\nkeV). \n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 74 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 100% of\nthe XRT 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\nXRT error circle. No correction has been made for the expected extinction\ncorresponding to E(B-V) of 0.166. \n\nBurst Advocate for this burst is K. L. Page (kimlpage1978 AT gmail.com). \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": 33571,
  "createdOn": 1680725466000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 230405B: Swift detection of a burst",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 230405B"
}