{
  "bibcode": "2003GCN..1924....1P",
  "body": "Kristian Pedersen (U. of Copenhagen), Johan Fynbo (U. of Aarhus),\nJens Hjorth (U. of Copenhagen), Darach Watson (U. of Copenhagen)\nreport on behalf of the GRACE collaboration:\n\n\"Chandra X-ray Observatory observed the field of the GRB 030226 \n(Suzuki et al., GCN 1888) with the ACIS-S3 detector for a total of \n11.9 hours, starting Feb 27, 16:49 UT, 37.1 hours after the GRB trigger. \nBased on a preliminary analysis we identify a previously unknown, fading \nX-ray source at the position\n\nRA (J2000.0) = 11 33 04.93, Dec (J2000.0) =  +25 53 55.3\n\nconsistent with the position of the optical transient (Price et al.,\nGCN 1880). The positional accuracy is better than one arcsec. Hence \nwe identify the source as the X-ray afterglow of GRB 030226.\n\nThe 0.3-10 keV count rate averaged over the observation is 9.7e-03 counts/s, \nand the average 2-10 keV flux is 3.2e-14 erg/cm^2/s. The spectrum is well \nfitted by an absorbed power law with spectral index 1.0 +/-0.2, absorption \nfixed at the Galactic value (1.6e20 cm^2), and an absorbing column density \nof 1e22 +/- 0.5e22 cm^-2 at a redshift of 1.98. A power law with Galactic\nabsorption only is not an acceptable fit to the soft part of the Chandra \nspectrum. No other obvious spectral features are detected.\n\nWe thank Harvey Tananbaum for rapidly approving Director's Discretionary\nTime for this observation, and the staff at the Chandra Science Center\nfor smoothly implementing and processing the observation.\"",
  "circularId": 1924,
  "createdOn": 1046864999000,
  "email": "jens@astro.ku.dk",
  "subject": "Chandra detection of the X-ray afterglow of GRB 030226",
  "submitter": "Jens Hjorth at U.Copenhagen  <jens@astro.ku.dk>",
  "eventId": "GRB 030226"
}