TITLE:   GCN CIRCULAR
NUMBER:  21811
SUBJECT: LIGO/Virgo G299232: Maidanak observations of optical transient SwiftJ014008.5+343403.6
DATE:    17/09/04 16:37:50 GMT
FROM:    Alexei Pozanenko at IKI,Moscow  <grbgw.iki@gmail.com>

A. Pozanenko (IKI), A. Volnova (IKI), E. Mazaeva (IKI), B. Hafizov 
(UBAI), O. Burhonov (UBAI)  report on behalf of IKI-GW follow-up 
collaboration:

We observed the field of the Optical Transient discovered by Swift/UVOT 
(Emery et al., GCN 21733)  with  AZT-22 telescope of Maidanak 
observatory starting on 2017-08-28 (UT) 21:25:37. We obtained several 
images in R-filter.  The optical transient (Emery et al., GCN 21733) is 
not detected in a combined image.  Preliminary  photometry of the field 
is following.

Date       UT start  t-T0     Filter      Exp.   OT   Err.  UL
                    (Since LVC,mid, days) (s)         (3 sigma)

2017-08-28 21:25:37  3.34167  R           3600   n/d  n/d   23.0

Photometry is based on nearby USNO-B1.0 stars (R2 magnitudes).