TITLE:   GCN CIRCULAR
NUMBER:  44065
SUBJECT: GRB 260310A / AT 2026fgk: KAIT optical observations
DATE:    26/03/21 06:49:53 GMT
FROM:    Weikang Zheng at UC Berkeley <weikang@berkeley.edu>

WeiKang Zheng (UCB) and Alexei V. Filippenko (UCB) report on

behalf of the KAIT GRB team:


The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at

Lick Observatory, observed the field of GRB 251022A (Fermi GBM

Team, GCN 43951; Salunke et al., GCN 43958) on March 13, 14, 18

19, 20 UT. A set of B, V, R, I and clear (roughly R) filter images

were obtained. We clearly detected the optical afterglow (O'Neill

et al. 2026, TNS Discovery Report 294132; Konno et al., GCN 43974;

Hinds et al., GCN 43977; Lipunov et al., GCN 43978;Martin-Carrillo

et al., GCN 43979; Méndez et al., GCN 43980;de Ugarte Postigo

et al., GCN 43984; Hsu et al., GCN 43986; Pursiainen et al., GCN

43990; Becerra et al., GCN 43991; Li et al., GCN 43993; Jayaraman

et al., GCN 43994; Stein et al., GCN 43996;Martin-Carrillo et al.,

GCN 44000; Moreno Méndez et al., GCN 43980; Becerra et al., GCN

43991; Li et al., GCN 43993; Stein et al., GCN 43996; Watson et al.,

GCN 44001; Lai et al., GCN 44002; Izzo et al., GCN 44003; Brivio

et al., GCN 44004; Moskvitin et al., GCN 44006; Romanov, GCN 44020;

Brosio et al., GCN 44021; Pawar et al., GCN 44022; Belkin et al.,

GCN 44043; Li et al., GCN 44044; Gupta et al., GCN 44051; Salunke

et al., GCN 43958; Becerra et al., GCN 44059; Volnova et al., GCN

44060; Busmann et al., GCN 44061) in our coadd images and photometry

in R band gives the following result:


t-t0(d) Mag    err

------------------

3.21    17.98  0.03

4.25    18.31  0.02

8.24    18.34  0.02

9.22    18.30  0.02

10.20   18.54  0.03