TITLE:   GCN CIRCULAR
NUMBER:  38016
SUBJECT: GRB 241030A: SAO RAS optical observations
DATE:    24/10/31 17:15:46 GMT
FROM:    Moskvitin Alexander at SAO RAS <mosk@sao.ru>

A. S. Moskvitin (SAO RAS) and V. P. Goranskij (SAI MSU)
report on behalf of the GRB follow-up team.

We observed the field of the GRB 241030A (Klingler et al., GCN 37956;
Beardmore et al., GCN 37962; Wang et al., GCN 37972; Pillera et al.,
GCN 37979; Ridnaia et al., GCN 37982; Ambrosi et al., GCN 37988;
Wu et al., GCN 37997) with the 1-m telescope of SAO RAS, Zeiss-1000
equipped with the CCD-photometer on October 30/31 night. We obtained
series of 300 and 600 sec. images in Rc band.

The OT (Klingler et al., GCN 37956; Watson et al., GCN 37957;
Fernández-Rodríguez et al., GCN 37958; Zheng et al., GCN 37959;
An et al., GCN 37960; Higuchi et al., GCN 37963; Qiu et al.,
GCN 37965; Lin et al., GCN 37966; Wu et al., GCN 37970;
Breeveld & Klingler, GCN 37974; Méndez-Lapido et al., GCN 37993)
is clearly detected in our stacked frames. Preliminary photometry
calibrated against nearby Pan-STARRS stars (magnitudes converted
with Lupton 2005 equations) and not corrected by MW extinction:

date       UT_start--UT_end    t_mid-T0, h  exp., s   R_mag
Oct. 30    17:21:38--17:26:38  11.8392       6 x 300  18.72 +/- 0.04
Oct. 30    20:40:51--21:44:59  15.4145       6 x 600  19.09 +/- 0.06
Oct. 30/31 23:18:20--02:14:51  18.9756      15 x 600  19.36 +/- 0.04

list of used Pan-STARRS stars:
R.A. (J2000) Decl. (J2000)  R_mag (Lupton 2005)
343.156212740 80.434129340  14.119
343.189894620 80.452656920  17.502
343.155709870 80.466614280  16.501
343.372455850 80.465046470  14.448