TITLE: GCN CIRCULAR NUMBER: 22440 SUBJECT: MAXI J1813-095 source: AbAO optical observations DATE: 18/02/24 12:35:09 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), R. Inasaridze (AbAO), A. Pozanenko (IKI), A. Volnova (IKI), V. Ayvazian (AbAO), O. Kvaratskhelia (AbAO), G. Inasaridze (AbAO), I. Molotov (KIAM), report on behalf of larger GRB follow-up collaboration: We observed the field of the MAXI J1813-095 source (trigger=811167; ATel #11323 Kawase et al.) with AS-32 (0.7m). We obtained several unfiltered images starting on Feb. 22 (UT) 01:40:27. We do not detect any evident object within XRT error circle (Beardmore et al., GCN 22431). The only one object which is visible in POSS2 in coordinates (J2000) 18:13:33.84 -09:31:54.5 +/-0.8 is also visible in our combined image. The magnitude of the source is 18.92 +/- 0.12 and calibrated against nearby USNO-B1.0 stars. The field photometry is following Date UT start t-T0 Filter Exp. OT Err. UL (mid, days) (s) 2018-02-22 01:40:27 0.08079 CR 25*60 n/d n/d 20.2 The photometry is based on several USNO-B1.0 stars USNO-B.1_id R2 0804-0407386 15.99 0804-0407400 16.34 0804-0407451 15.77