{
  "bibcode": "2009GCN..9141....1V",
  "body": "On 2009 April 17  I observed the field of GRB 090417B (Sbarufatti et al.\nGCN Circ. 9135) with the 0.5m reflector and ST-10XME CCD camera of Stara\nLesna (Slovak Republic) observatory. I have got 11 frames in standard Rc\nsystem, starting at 22:10:05 UT, 23332s after the alert. In my coadded\nframe (total exposition 930s)it was not possible to detect a single source\ninside the refined XRT error box (Sbarufatti et al. GCN Circ. 9135) with\nS/N rate more than 5, which corresponds to limiting magnitude Rc >19.9.\nThe time of the middle of the sequence was 22:18:00 UT. GSC2.3 catalog was\nused for flux calibration.\n\nIgor Volkov, visiting astronomer of Astronomical Institute of the Slovak\nAcademy of Sciences, 059 60 Tatranska Lomnica, Slovak Republic; Sternberg\nAstronomical Institute, 119992  Moscow, Universitetskij pr.13;\ne-mail: volkov@ta3.sk, imv@sai.msu.ru",
  "circularId": 9141,
  "createdOn": 1240017933000,
  "email": "volkov@ta3.sk",
  "subject": "GRB 090417B: optical observations",
  "submitter": "Igor Volkov at Asro.Inst.Slovak Acad.Sciences  <volkov@ta3.sk>",
  "eventId": "GRB 090417B"
}