{
  "bibcode": "2009GCN..9159....1C",
  "body": "A. Copete, J. Grindlay (Harvard)\nS. Barthelmy, C. Markwardt, N. Gehrels (NASA/GSFC)\n\nWe report the detection of a bright GRB by the BAT Slew Survey (BATSS)  \nin the slew that started at 08:59:02 and lasted 151 sec. The ground- \ncalculated position is RA, Dec = 225.910, +17.224 deg, which is\nRA (J2000) = 15h 03m 38s\nDec(J2000) = +17d 13' 26\"\nwith an uncertainty of 1.91 arcmin (90% confidence, including  \nsystematics). The detection was triggered by simultaneous independent  \ndetections of 86.0 sigma and 41.8 sigma from imaging in the 15-50 keV  \nand 50-150 keV energy bands, respectively. The burst mask-tagged  \nlightcurve lightcurve in the 15-150 keV band shows a strong and broad  \nmulti-peaked emission structure starting at T+25sec as the burst  \nenters the BAT field-of-view, lasting 48 sec, and peaking 6 times at T \n+29, T+35, T+38, T+47, T+58 and T+62sec. This is followed by a weaker  \nbroad peak starting at T+87sec, lasting 28sec and peaking at T+100sec.  \nT90 = 65.0sec and T50 = 17.0sec.\n\nThe time-averaged spectrum over the 120 sec exposure time of the  \nsource is best fit by a power law with an exponential cutoff, with  \nphoton index 1.42 and high-energy cut at 319 keV. The fluence in the  \n15-150 keV band is 1.6 x 10^-5 erg/cm^2, and the peak 1-sec flux is  \n6.5 x 10^-7 erg/cm^2/sec at T+38sec. A follow-up Swift ToO observation  \nfor this burst has been scheduled.",
  "circularId": 9159,
  "createdOn": 1240093173000,
  "email": "acopete@head.cfa.harvard.edu",
  "subject": "GRB 090418B: Detection of a bright burst from Swift-BAT slew data",
  "submitter": "Antonio Copete at Harvard U  <acopete@head.cfa.harvard.edu>",
  "eventId": "GRB 090418B"
}