TITLE: GCN CIRCULAR NUMBER: 37336 SUBJECT: GRB 240825A: further SAO RAS optical observations DATE: 24/08/29 09:58:26 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 the GRB 240825A (The Fermi GBM team, GCN 37273; Gupta et al., GCN 37274; Lalla et al., GCN 37288; Evans et al., 37290; Gropp et al., GCN 37294; Joshi et al., GCN 37298; Sharma et al., GCN 37301; Frederiks et al., GCN 37302; Wang and Xiong, GCN 37315) with the SAO RAS 1-meter telescope Zeiss-1000 equipped with the CCD-photometer and UBVRcIc filters. We obtained 18 x 300 sec. images with Rc filter on August 28, 19:17:07 -- 21:04:35 UT (t_mid - T0 = 3.1791 days).
The OT (Gupta et al., GCN 37274; Jiang et al., GCN 37275; Dutton et al., GCN 37276; Odeh and Guessoum, GCNs 37277, 37299; Zhang et al., GCN 37278; Li et al., GCN 37280; Izzo and Malesani, GCN 37287; Lipunov et al., GCN 37289; Leonini et al., GCN 37291; Wu et al., GCN 37292; Martin-Carrillo et al., GCN 37293; Brivio et al., GCN 37295; Kuin et al., GCN 37296; Le Floc’h et al., GCN 37300; Zheng and Filippenko, GCN 37304; Wang et al., GCN 37306; Maksut et al., GCN 37307; Melandri et al., GCN 37310; Romanov, GCN 37335) is clearly detected in the stacked frame with the brightness of R = 22.15 +/- 0.07 calibrated against nearby Pan-STARRS stars (magnitudes converted to R band) and not corrected for the MW extinction.
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