TITLE: GCN CIRCULAR NUMBER: 37344 SUBJECT: GRB 240828A: SAO RAS optical observations DATE: 24/08/29 21:25:40 GMT FROM: Moskvitin Alexander at SAO RAS mosk@sao.ru
A. S. Moskvitin and O. I. Spiridonova (SAO RAS) report on behalf of the GRB follow-up team.
We observed the field of GRB 240828A (Fermi GBM team, GCN 37317; Srijan et al., GCN 37328; Gupta and Di Lalla, GCN 37331; Beardmore et al., GCN 37337; Dalessi and Meegan GCN 37341) with the SAO RAS 1-meter telescope Zeiss-1000 equipped with the CCD-photometer. We obtained 3 x 300 sec frames in each of BVRcIc filters on August 29.
The OT (Zheng and Filippenko; GCN 37339) is clearly detected in our images. The results are as follows.
Start -- Stop, UT t_mid - T0, d filter mag +/- err 18:14:38 -- 18:33:37 1.14515 B 20.54 +/- 0.05 18:34:12 -- 18:50:59 1.15798 V 20.16 +/- 0.05 17:38:50 -- 17:56:05 1.11969 Rc 19.73 +/- 0.03 17:56:52 -- 18:13:53 1.13213 Ic 19.36 +/- 0.07
Magnitudes were calibrated against nearby SDSS stars (converted with Lupton 2005 equations) and not corrected for the MW extinction.
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