{
  "bibcode": "2015GCN.17368....1C",
  "body": "J. K. Cannizzo (NASA/UMBC), A. P. Beardmore (U Leicester),\nN. Gehrels (NASA/GSFC), H. A. Krimm (CRESST/GSFC/USRA),\nD. Malesani (DARK/NBI), F. E. Marshall (NASA/GSFC),\nK. L. Page (U Leicester) and T. N. Ukwatta (LANL) report on behalf of\nthe Swift Team:\n\nAt 13:46:59 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 150201A (trigger=629302).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 11.832, -37.625 which is \n   RA(J2000) = 00h 47m 20s\n   Dec(J2000) = -37d 37' 29\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a double-peaked\nstructure with a duration of about 20 sec.  The peak count rate\nwas ~21500 counts/sec (15-350 keV), at ~2 sec before the trigger. \n\nThe XRT began observing the field at 13:48:26.8 UT, 87.2 seconds after\nthe BAT trigger. XRT found a bright, uncatalogued X-ray source located\nat RA, Dec 11.8325, -37.6193 which is equivalent to:\n   RA(J2000)  = +00h 47m 19.80s\n   Dec(J2000) = -37d 37' 09.5\"\nwith an uncertainty of 5.0 arcseconds (radius, 90% containment). This\nlocation is 20 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 3.03e-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 92 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\n0.01. \n\nBurst Advocate for this burst is J. K. Cannizzo (cannizzo AT milkyway.gsfc.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": 17368,
  "createdOn": 1422799216000,
  "email": "hans.krimm@nasa.gov",
  "subject": "GRB 150201A: Swift detection of a burst",
  "submitter": "Hans Krimm at NASA-GSFC  <hans.krimm@nasa.gov>",
  "eventId": "GRB 150201A"
}