{
  "bibcode": "2005GCN..3027....1P",
  "body": "K. Page (U. Leicester), G. Tagliaferri, S. Campana, A. Moretti, C. \nPagani,  P. Romano, G.\nChincarini (OAB), G. Cusumano, V. Mangano, V. La Parola (IASF/Palermo), D. \nN. Burrows, J. Kennea, J. E. Hill, J. A. Nousek (PSU), J. P. Osborne, M. \nGoad, A. Beardmore, A. F. Abbey, A. A. Wells (U. Leicester), P. Giommi, M. \nCapalbi, M. Perri, F. Tamburelli (ASDC), T. Sakamoto, L. Angelini, N. \nGehrels (GSFC), W. Voges (MPE), L. Cominsky (Sonoma State U.), M. Tripicco \n(GSFC-SSAI), report on behalf of the Swift XRT team:\n\nThe Swift BAT instrument detected GRB 050215b at 02:35:00 UT on 15 Feb 2005.\nThe observatory executed an automated slew to the BAT position, but the XRT \nwas in Manual State collecting calibration data and did not perform its \nnormal automated GRB observing sequence.  Furthermore, the satellite \nentered the SAA shortly after detecting this burst, and the XRT had data \ncollection disabled until it exited the SAA at 03:03 to 03:10 UT, at which \ntime the XRT was in Manual state and made observations in Windowed Timing \n(WT) mode.  On the second orbit XRT collected data from 04:11 to 04:15 in \nPhoton Counting (PC) mode, and from 04:44 to 04:47 in WT mode.  (In between \nSwift was again located in the SAA).  Observations continued in both WT and \nPC modes on subsequent orbits.  With three orbits of PC mode data processed \nthrough the ground software, we find a faint, uncataloged X-ray source \nlocated 35 arcseconds from the BAT position at\n\nRA(J2000) = 11 37 46.1, Dec(J2000) = +40 47 54.3.\n\nThe XRT alignment calibration is still in progress.  We estimate a systematic\nuncertainty in this position of 6 arc seconds radius.\n\nHowever, the lightcurve of this source, in both WT and PC mode, does NOT \nappear to be fading, although the source is extremely weak and the \nstatistics are not good enough yet for an accurate \ndetermination.  GRB050215b remains the Swift Automated Target, and we \nexpect to continue monitoring operations for the next 12 hours.",
  "circularId": 3027,
  "createdOn": 1108481302000,
  "email": "dxb15@psu.edu",
  "subject": "GRB 050215b: Swift XRT Observations",
  "submitter": "David Burrows at PSU/Swift  <dxb15@psu.edu>",
  "eventId": "GRB 050215B"
}