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GCN Circular 4932

Subject
GRB 060218SN 2006aj: optical observations at Rozhen Observatory
Date
2006-03-28T13:01:08Z (18 years ago)
From
Evgeni Semkov at Inst.of Astronomy,Bulgaria <evgeni@skyarchive.org>
E. Semkov (IA, BAS) on behalf of the BAS/CNRS collaboration report:

We observed the afterglow of GRB 060218 (Cusumano et al., GCN 4775;
Marshall et al., GCN 4800) with the 2m RCC telescope at the National
Astronomical Observatory Rozhen (Bulgaria) on Mar. 21 and 26. The
calibration was made using comparison stars from Hicken et al. (GCN 4898)
and Modjaz et al. (astro-ph/0603377). Observations were made under good
atmospheric conditions through a standard Johnson-Cousins set of filters.

The optical counterpart was detected at the following magnitudes:

Date,   UT(R),  I,               R,               V
Mar 21  18:45   17.921 (0.062)   18.340 (0.027)   18.589 (0.026)
Mar 26  18:00   18.106 (0.057)   18.429 (0.022)   18.916 (0.024)

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