{
  "bibcode": "2003GCN..1925....1F",
  "body": "T. Fatkhullin, V. Komarova, V. Sokolov, A. Cherepashchuk,\nk. Postnov report for the larger GOSH collaboration:\n\nThe field of the GRB 030226 optical transient (Fox et al., GCN #1879)\nwas observed with CCD-photometer at the 1-m (Zeiss-1000) and \nSCORPIO at the 6-m telescopes of SAO RAS during three nights. \nData from the 6-m telescope were obtained during time of the \nscheduled program \"Search for optical emission of nearby pulsars\" \n(P.I. V.G. Kurt). The weather conditions were slightly variable with \ncirruses and seeing of 2.5-3.0 arcsec in the first night, 2.5 arcsec \nseeing in the second one and 1.4 arcsec seeing in the third one. The B, \nV, Rc filters were used. Photometric calibration was performed using \nsecondary standard stars of Henden et al., GCN #1916. The results of \nour photometry are presented below:\n\n  Telescope |  Mean Date, UT | Tot. exp. | Filter | Mag.            \n--------------------------------------------------------------\n Zeiss-1000 |    27.96 Feb.  |  2400s    |  V     | 22.07 +/- 0.19  \n Zeiss-1000 |    27.92 Feb.  |  2000s    |  Rc    | 21.75 +/- 0.18  \n\n  6-m       |    28.99 Feb.  |  1200s    |  B     | 24.64 +/- 0.21  \n  6-m       |    01.00 Mar.  |  1350s    |  V     | 23.66 +/- 0.16  \n  6-m       |    28.99 Feb.  |  720s     |  Rc    | 22.96 +/- 0.12  \n\n  6-m       |    01.94 Mar.  |  1200s    |  V     | 23.89 +/- 0.12\n  6-m       |    01.92 Mar.  |  1200s    |  Rc    | 23.39 +/- 0.09\n\n  \nIn the images obtained at the last night we clearly detect an \nextended object (R=22.9) 2.5 arsec South-East from optical \ntransient (OT) position. Thus, the results of our aperture photometry \nof the OT may be affected by this object. We are planning to recalibrate \nthe data provided additional realiable secondary standards are available.\n\nWe thank V.G. Kurt for sharing observational time and O. Spiridonova\nfor kind assistance in the Zeiss-1000 observations.\n\nThis message is citeable.",
  "circularId": 1925,
  "createdOn": 1046877548000,
  "email": "sokolov@sao.ru",
  "subject": "GRB030226, BVRc observations",
  "submitter": "Vladimir Sokolov at SAO RAS  <sokolov@sao.ru>",
  "eventId": "GRB 030226"
}