{
  "bibcode": "2009GCN..9161....1S",
  "body": "G. Stratta (ASDC), S. D. Barthelmy (GSFC), D. N. Burrows (PSU),\nJ. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC),\nC. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC),\nE. A. Hoversten (PSU), N. P. M. Kuin (MSSL),\nV. Mangano (INAF-IASFPA), J. Mao (INAF-OAB),\nR. Margutti (Univ Bicocca&OAB), F. E. Marshall (NASA/GSFC),\nD. M. Palmer (LANL), A. M. Parsons (GSFC), M. Perri (ASDC),\nP. Romano (INAF-IASFPA) and B. Sbarufatti (INAF-IASFPA) report on\nbehalf of the Swift Team:\n\nAt 13:43:31 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 090419 (trigger=349592).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 196.976, -75.609 which is \n   RA(J2000) = 13h 07m 54s\n   Dec(J2000) = -75d 36' 30\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a slow single\npeak taking 30 seconds to rise to a maximum with a duration of\nat least 90 seconds, and an additional peak at T+320.  The peak\ncount rate was ~800 counts/sec  (15-350 keV), at ~30 sec after \nthe trigger. \n\nThe XRT began observing the field at 13:45:31.0 UT, 119.7 seconds after\nthe BAT trigger. Using promptly downlinked data we find a bright,\nfading, uncatalogued X-ray source located at RA, Dec 196.92907,\n-75.60534 which is equivalent to:\n   RA(J2000)  = 13h 07m 42.98s\n   Dec(J2000) = -75d 36' 19.2\"\nwith an uncertainty of 3.7 arcseconds (radius, 90% containment). This\nlocation is 44 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 in excess of the Galactic value (1.2e+21\ncm^-2, Kalberla et al. 2005), with an excess column of 1.1\n(+0.85/-0.64) x 10^22 cm^-2 (90% confidence). \n\nThe initial flux in the 2.5 s image was 5.55e-10 erg cm^-2 s^-1 (0.2-10\nkeV). \n\n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 126 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 coverage of the XRT error circle by the 8'x8' region for the list of\nsources generated on-board is uncertain because the large number of sources\nfilled the available telemetry. No correction has been made for the expected\nextinction corresponding to E(B-V) of 0.30. \n\n\n\n\nBurst Advocate for this burst is G. Stratta (giulia.stratta AT asdc.asi.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": 9161,
  "createdOn": 1240149593000,
  "email": "dxb15@psu.edu",
  "subject": "GRB 090419: Swift detection of a burst",
  "submitter": "David Burrows at PSU/Swift  <dxb15@psu.edu>",
  "eventId": "GRB 090419"
}