TITLE: GCN CIRCULAR NUMBER: 38890 SUBJECT: GRB 250101A: CMO RC-500 optical observations DATE: 25/01/10 12:36:46 GMT FROM: Nicolai Pankov at HSE, IKI RAS colinsergesen@gmail.com
N. Pankov (HSE, IKI RAS), A. Pozanenko (IKI RAS), A. Tarasenkov (INASAN), A. Moskvitin (SAO RAS) report on behalf of a larger collaboration:
We performed optical observations of the field of GRB 250101A (Page et. al, GCN 38752; Li et. al, GCN 38753; Mohan et. al, GCN 38754; Zhu et. al, GCN 38755; Budnev et. al, GCN 38756; Wu et. al, GCN 38758; Zhu et. al, GCN 38759; Goad et. al, GCN 38761; Moskvitin et. al, GCN 38762; Odeh et. al, GCN 38763; Hu et. al, GCN 38764; Moskvitin et. al, GCN 38765; D'Avino et. al, GCN 38768; Escudero-Coca et. al, GCN 38769; Leonini et. al, GCN 38771; Dichiara et. al, GCN 38773; Zhang et. al, GCN 38774; Siegel, GCN 38775; Li et. al, GCN 38776; Komesh et. al, GCN 38777; Ghosh et. al, GCN 38779; Moskvitin et al., GCN 38780; Krimm et. al, GCN 38782; Komesh et. al, GCN 38790; Méndez-Lapido et. al, GCN 38810; Gupta et. al, GCN 38818; Ferro et. al, GCN 38831; Lin et. al, GCN 38837; Pankov et. al., GCN 38869) in the R filter with the 0.5-meter RC-500 telescope located at the Caucasus Mountain Observatory (CMO). The observations began on 2025-01-01 14:40:56 UT, i.e. ~1.28 hours since trigger. The preliminary light curve of the optical afterglow is available at http://grb.rssi.ru/GRB250101A/GRB250101A_RC50_KGO.png. After a typical power-law decay, the afterglow light curve demonstrates a re-brightening occurring at ~5 hr since burst, initially reported by Moskvitin et. al, GCN 38765.
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