{
  "bibcode": "2013GCN.15246....1L",
  "body": "A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (NASA/GSFC),\nK. L. Page (U Leicester), D. M. Palmer (LANL),\nJ. L. Racusin (NASA/GSFC), M. H. Siegel (PSU) and T. N. Ukwatta (MSU)\nreport on behalf of the Swift Team:\n\nAt 04:11:24 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 130925A (trigger=571830).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 41.183, -26.134 which is \n   RA(J2000) = 02h 44m 44s\n   Dec(J2000) = -26d 08' 03\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed that the burst\nwas active during the pre-planned slew before the nominal trigger\nwith an additional peak extending at least to T+170. The peak count\nrate was ~2700 counts/sec (15-350 keV), at ~110 sec after the trigger. \n\nThe XRT began observing the field at 04:13:52.3 UT, 147.4 seconds after\nthe BAT trigger. XRT found a bright, uncatalogued X-ray source located\nat RA, Dec 41.1766, -26.1544 which is equivalent to:\n   RA(J2000)  = +02h 44m 42.38s\n   Dec(J2000) = -26d 09' 15.8\"\nwith an uncertainty of 5.1 arcseconds (radius, 90% containment). This\nlocation is 76 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\nUVOT took a finding chart exposure of 150 seconds with the White \nfilter starting 156 seconds after the BAT trigger. No credible \nafterglow candidate has been found in the initial data products. The \n2.7'x2.7' covers 100% of the XRT error circle. The typical 3-sigma\nupper limit has been about 19.6 mag. Results from the list  of sources\ngenerated on-board are not available at this time. No correction has\nbeen made for the expected extinction corresponding to E(B-V) of\n0.02. \n\nBurst Advocate for this burst is A. Y. Lien (yarleen 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/too.html.)",
  "circularId": 15246,
  "createdOn": 1380083201000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 130925A: Swift detection of a burst",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 130925A"
}