{
  "bibcode": "2022GCN.32603....1C",
  "body": "S. B. Cenko (GSFC), A. P. Beardmore (U Leicester), C. Gronwall (PSU),\nJ. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), K. L. Page (U Leicester)\nand T. M. Parsotan (GSFC/UMBC/CRESSTII) report on behalf of the Neil\nGehrels Swift Observatory Team:\n\nAt 11:11:52 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 220930A (trigger=1125809).  Swift slewed immediately to the\nburst.\nThe BAT on-board calculated location is\nRA, Dec 64.737, +13.352 which is\n   RA(J2000) = 04h 18m 57s\n   Dec(J2000) = +13d 21' 06\"\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 and a secondary peak at about\n70 seconds after the trigger time.  The peak count rate\nwas ~3000 counts/sec (15-350 keV), at ~0 sec after the trigger.\n\nThe XRT began observing the field at 11:14:42.1 UT, 170.0 seconds after\nthe BAT trigger. XRT found a bright, uncatalogued X-ray source located\nat RA, Dec 64.7149, 13.3500 which is equivalent to:\n   RA(J2000)  = 04h 18m 51.58s\n   Dec(J2000) = +13d 21' 00.0\"\nwith an uncertainty of 5.0 arcseconds (radius, 90% containment). This\nlocation is 77 arcseconds from the BAT onboard position, within the BAT\nerror circle. No event data are yet available to determine the column\ndensity using X-ray spectroscopy.\n\nThe initial flux in the 2.5 s image was 3.09e-09 erg cm^-2 s^-1 (0.2-10\nkeV).\n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 179 seconds after the BAT trigger. No credible afterglow\ncandidate has been found in the initial data products. The 2.7'x2.7'\nsub-image covers 100% of the XRT error circle. The typical 3-sigma upper\nlimit has been about 19.6 mag. The 8'x8' region for the list of sources\ngenerated on-board covers 100% of the XRT error circle. The list of\nsources is typically complete to about 18 mag. No correction has been made\nfor the expected extinction corresponding to E(B-V) of 0.639.\n\nBurst Advocate for this burst is S. B. Cenko (brad.cenko AT nasa.gov).\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": 32603,
  "createdOn": 1664537763000,
  "email": "klp5@leicester.ac.uk",
  "subject": "GRB 220930A: Swift detection of a burst",
  "submitter": "Kim Page at U.of Leicester  <klp5@leicester.ac.uk>",
  "eventId": "GRB 220930A"
}