{
  "bibcode": "2000GCN...720....1M",
  "body": "N. Masetti, E. Palazzi, E. Pian (ITESRE, CNR, Bologna), \nA.J. Castro-Tirado (LAEFF, IAA), R. Hudec, J. Soldan (ASU, Ondrejov),\nM. Bernas and P. Pata (CVUT-FEL, Prague), \nJ.M. Castro Ceron (ROA, San Fernando), C. Kouveliotou (USRA),\nJ. Hjorth (Univ. of Copenhagen), P.M. Vreeswijk, \nE.P.J. van den Heuvel (Univ. of Amsterdam), J. Greiner (AIP), \nM. Zoccali (Univ. of Padua) and O. Hainaut (ESO), \non behalf of larger collaborations, report:\n\n\n\"We have obtained several unfiltered images of the IPN error box for the\nshort, hard burst GRB000607 (Hurley et al., GCN 693), with the \nnarrow-field CCD attached to the 0.3-m telescope of BOOTES-1 \nat El Arenosillo (Spain) on Jun 9.24 UT (51 hr after the event, 360 sec\nexposure time).\nThe limiting magnitude of the summed image, covering the whole error box,\nis ~16 due to the very poor observing conditions (the GRB field was\nimaged close to dawn). None of the single images, as well as their sum, \nreveals any new, or strongly variable, source when compared with the\nDigital Sky Survey (DSS-II).\n\nWe also acquired an optical R-band image of northern part of the error box\nof this GRB just before dawn on 2000 June 9.44 UT (i.e. ~56 hr after \nthe GRB trigger) with the 1.54-meter Danish telescope (plus DFOSC) \nat ESO - La Silla (Chile). Seeing was ~2 arcsec, and exposure time was\n450 sec.\nThis image also could not be very deep as it was obtained during twilight\ndue to the unfavourable position of this GRB with respect to the Sun; \nindeed, the southern part of the error box could not be imaged because of\na too high sky level.\nPhotometric calibration was performed using USNO-A1.0 field stars.\nThe comparison with the DSS-II survey does not reveal any new or\nsubstantially variable object brighter than R ~ 19.5.\".\n\n\nThis message can be cited.",
  "circularId": 720,
  "createdOn": 961514040000,
  "email": "masetti@tesre.bo.cnr.it",
  "subject": "GRB000607, optical observations",
  "submitter": "Nicola Masetti at ITeSRE,CNR,Bologna  <masetti@tesre.bo.cnr.it>",
  "eventId": "GRB 000607"
}