{
  "subject": "GRB 060218SN 2006aj: optical observations at Rozhen Observatory",
  "version": 3,
  "editedOn": 1776177727507,
  "submitter": "Evgeni Semkov at Inst.of Astronomy,Bulgaria  <evgeni@skyarchive.org>",
  "circularId": 4932,
  "email": "evgeni@skyarchive.org",
  "body": "E. Semkov (IA, BAS) on behalf of the BAS/CNRS collaboration report:\n\nWe observed the afterglow of GRB 060218 (Cusumano et al., GCN 4775;\nMarshall et al., GCN 4800) with the 2m RCC telescope at the National\nAstronomical Observatory Rozhen (Bulgaria) on Mar. 21 and 26. The\ncalibration was made using comparison stars from Hicken et al. (GCN 4898)\nand Modjaz et al. (astro-ph/0603377). Observations were made under good\natmospheric conditions through a standard Johnson-Cousins set of filters.\n\nThe optical counterpart was detected at the following magnitudes:\n\nDate,   UT(R),  I,               R,               V\nMar 21  18:45   17.921 (0.062)   18.340 (0.027)   18.589 (0.026)\nMar 26  18:00   18.106 (0.057)   18.429 (0.022)   18.916 (0.024)\n\nThis message may be cited.",
  "eventId": "GRB 060218",
  "bibcode": "2006GCN..4932....1S",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>",
  "format": "text/plain",
  "createdOn": 1143550868000
}