{
  "bibcode": "2011GCN.12106....1S",
  "body": "B. Sbarufatti (INAF-OAB/IASFPA), S. D. Barthelmy (GSFC),\nD. N. Burrows (PSU), M. M. Chester (PSU), J. R. Cummings (NASA/UMBC),\nS. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU),\nN. P. M. Kuin (UCL-MSSL), C. J. Saxton (UCL-MSSL), M. H. Siegel (PSU)\nand E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift Team:\n\nAt 23:47:50 UT, the Swift Burst Alert Telescope (BAT) triggered\n(trigger=456532).  Swift slewed immediately to the calculated location:\nRA, Dec 318.634, -46.745, which is \n   RA(J2000)  =  21h 14m 32s\n   Dec(J2000) = -46d 44' 42\"\nThe lightcurve does not show anything significant and the peak\nin the image plane is of marginal significance (less than 7 sigma). \n\nThe XRT began observing the field at 23:49:22.2 UT, 92.0 seconds after\nthe BAT trigger. No source was detected in 230 s of promptly downlinked\ndata. \n\nUVOT took a finding chart exposure of 124 seconds with the U filter starting\n254 seconds after the BAT trigger. No credible afterglow candidate has been\nfound in the initial data products. The 2.7'x2.7' sub-image covers 25% of the\nBAT error circle. The typical 3-sigma upper limit has been about 19.2 mag. Data\nfrom the list of sources generated on-board are not available at this time. No\ncorrection has been made for the expected extinction corresponding to E(B-V) of\n0.04. \n\nGiven the above low significances and non-detections, we conclude that\nthis trigger is not due to anything astrophysical, and is just a chance\ncoincidence of noise in the rate and image domains. \n\nBurst Advocate for this burst is B. Sbarufatti (boris.sbarufatti AT brera.inaf.it). \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": 12106,
  "createdOn": 1309651673000,
  "email": "scott@milkyway.gsfc.nasa.gov",
  "subject": "Swift-BAT trigger 456532 is not astrophysical",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@milkyway.gsfc.nasa.gov>"
}