{
  "bibcode": "2012GCN.13049....1S",
  "body": "M. Stamatikos (OSU/NASA/GSFC), S. Campana (INAF-OAB),\nM. M. Chester (PSU), V. D'Elia (ASDC), N. Gehrels (NASA/GSFC),\nS. T. Holland (STScI), J. A. Kennea (PSU), V. Mangano (INAF-IASFPA),\nF. E. Marshall (NASA/GSFC), A. Maselli (INAF-IASFPA),\nA. Melandri (INAF-OAB), J. P. Osborne (U Leicester),\nK. L. Page (U Leicester), D. M. Palmer (LANL),\nP. Romano (INAF-IASFPA), B. Sbarufatti (INAF-OAB/PSU),\nM. H. Siegel (PSU), M. C. Stroh (PSU), C. A. Swenson (PSU),\nG. Tagliaferri (INAF-OAB) and B.-B. Zhang (PSU) report on behalf of\nthe Swift Team:\n\nAt 16:06:28 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 120312A (trigger=517566).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 251.764, +23.857 which is \n   RA(J2000) = 16h 47m 03s\n   Dec(J2000) = +23d 51' 24\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a single-peaked FRED\nstructure with a duration of 12 about sec.  The peak count rate\nwas ~1300 counts/sec (15-350 keV), at ~0 sec after the trigger. \n\nUsing promptly downlinked data we find an uncatalogued X-ray source\nwith an enhanced position: RA, Dec 251.7885, 23.8586 which is\nequivalent to:\n   RA(J2000)  = 16h 47m 09.23s\n   Dec(J2000) = +23d 51' 30.8\"\nwith an uncertainty of 2.1 arcseconds (radius, 90% containment). This\nposition may be improved as more data are received; the latest position\nis available at http://www.swift.ac.uk/sper. \n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density in excess of the Galactic value (4.08 x\n10^20 cm^-2, Kalberla et al. 2005), with an excess column of 1.7\n(+1.51/-1.34) x 10^21 cm^-2 (90% confidence). \n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 112 s 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\n0.07. \n\nBurst Advocate for this burst is M. Stamatikos (Michael.Stamatikos-1 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/too.html.)",
  "circularId": 13049,
  "createdOn": 1331570033000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 120312A: Swift detection of a burst",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 120312A"
}