{
  "bibcode": "2003GCN..1887....1C",
  "body": "A. J. Castro-Tirado (IAA-CSIC and LAEFF-INTA),\nA. de Ugarte Postigo (IAA-CSIC), T. J. Mateo\nSanguino, M. T. Fern�ndez Palomo (CEDEA-INTA),\n M. J�linek, P. Kub�nek, R. Hudec (ASU), S. Vitek,\nP. P�ta (CVUT) and J. �. Bern�  (Univ. de Alicante)\non behalf of the BOOTES team,\n \nreport:\n \n\"We have obtained several unfiltred exposures (180-s each)\nunder thin thirrus covering the GRB 030226 error box. The\nimages covered the period  03:45:16 - 03:56:26 UT 26 Feb 2003\n(i.e. between 1.5-minutes before the trigger and 9.9-minutes\nafter the trigger) with the wide-field  camera of BOOTES-1.\n \nAfter a visual inspection of the HETE-2 error box in all\nframes, we do not find evidence of optical emission at the\nposition of the bright optical counterpart (GCNC 1879, 1881,\n1882), in particular simultaneously to the burst itself, for\nwhich we have an image covering  the time interval 03:45:16 -\n03:48:16 UT. Therefore we derive an upper limit of R = 11.5\nfor the reverse shock emission (if any) arising from this GRB,\nin contrast to the 9-th magnitude prompt flash emission\nrecorded for GRB 990123 (Akerloff et al. 1999, Nat 398, 400)\".\n \n \n \nThis message can be cited.",
  "circularId": 1887,
  "createdOn": 1046290217000,
  "email": "ajct@laeff.esa.es",
  "subject": "GRB 030226 simultaneous optical observations",
  "submitter": "Alberto Castro-Tirado at LAEFF-INTA  <ajct@laeff.esa.es>",
  "eventId": "GRB 030226"
}