{
  "bibcode": "2012GCN.12954....1H",
  "body": "E. A. Hoversten (PSU), W. H. Baumgartner (GSFC/UMBC),\nD. N. Burrows (PSU), N. Gehrels (NASA/GSFC),\nA. Y. Lien (NASA/GSFC/ORAU), V. Mangano (INAF-IASFPA),\nC. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC),\nD. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/PSU), T. N. Ukwatta (MSU)\nand B.-B. Zhang (PSU) report on behalf of the Swift Team:\n\nAt 00:41:15 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 120215A (trigger=515015).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is RA, Dec 30.032, +8.792 which is \n   RA(J2000) = 02h 00m 08s\n   Dec(J2000) = +08d 47' 30\"\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 15 sec.  The peak count rate\nwas ~1000 counts/sec (15-350 keV), at ~3 sec after the trigger. \n\nThe XRT began observing the field at 00:43:01.8 UT, 106.5 seconds after\nthe BAT trigger. Using promptly downlinked data we find a fading,\nuncatalogued X-ray source located at RA, Dec 30.04753, 8.80220 which is\nequivalent to:\n   RA(J2000)  = 02h 00m 11.41s\n   Dec(J2000) = +08d 48' 07.9\"\nwith an uncertainty of 3.9 arcseconds (radius, 90% containment). This\nlocation is 66 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 http://www.swift.ac.uk/sper. \n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density consistent with the Galactic value of 5.40\nx 10^20 cm^-2 (Kalberla et al. 2005). \n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 110 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\n0.08. \n\nBurst Advocate for this burst is E. A. Hoversten (hoversten AT astro.psu.edu). \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": 12954,
  "createdOn": 1329267093000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 120215A: Swift detection of a burst",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 120215A"
}