{
  "bibcode": "2016GCN.19298....1G",
  "body": "S. L. Gibson (U Leicester), A. Y. Lien (GSFC/UMBC),\nK. L. Page (U Leicester), D. M. Palmer (LANL) and M. H. Siegel (PSU)\nreport on behalf of the Swift Team:\n\nAt 04:23:54 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 160412A (trigger=682522).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 33.107, -67.645 which is \n   RA(J2000) = 02h 12m 26s\n   Dec(J2000) = -67d 38' 42\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a complex\npeak structure with a duration of about 80 sec.  The peak count rate\nwas ~1800 counts/sec (15-350 keV), at ~13 sec after the trigger. \n\nThe XRT began observing the field at 04:25:13.5 UT, 78.8 seconds after\nthe BAT trigger. XRT found a bright, uncatalogued X-ray source located\nat RA, Dec 33.0482, -67.6266 which is equivalent to:\n   RA(J2000)  = +02h 12m 11.57s\n   Dec(J2000) = -67d 37' 35.8\"\nwith an uncertainty of 4.7 arcseconds (radius, 90% containment). This\nlocation is 104 arcseconds from the BAT onboard position, within the\nBAT error circle. No event data are yet available to determine the\ncolumn density using X-ray spectroscopy. \n\nThe initial flux in the 2.5 s image was 9.17e-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 90 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. 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\n0.04. \n\nBurst Advocate for this burst is S. L. Gibson (slg44 AT le.ac.uk). \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": 19298,
  "createdOn": 1460435845000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 160412A: Swift detection of a burst",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 160412A"
}