TITLE:   GCN CIRCULAR
NUMBER:  34047
SUBJECT: ZTF23aaoohpy/AT2023lc: Mondy optical observations
DATE:    23/06/21 09:26:11 GMT
FROM:    Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>

S. Belkin (IKI, HSE), E. Klunko (ISTP), A. Pozanenko (IKI), N. Pankov (HSE) report on behalf of GRB IKI FuN:

We observed the field of ATLAS23msn/ZTF23aaoohpy/AT2023lcr (Swain et al., GCN 34022) with AZT-33IK telescope of Mondy observatory in R-filter on 2023-06-20 starting (UT) 15:34:09 (mid exposure time is ~2.4 days after the ZTF discovery). We detect the optical counterpart (Gompertz et al., GCN34023; Kumar et al., GCN34025; Adami et al., GCN 34030; Perley et al, GCN 34031; Jiang et al., GCN 34040; Perley et al., GCN 34041; Fulton et al., 34042; Chen et al., GCN 34043). Preliminary photometry of a stacked image is following

Date        UT start  MJD            Exp.   Filter OT   Err.  UL(3sigma)
                      (mid exposure) (s)

2023-06-20  15:34:09  60115.66607639  25*120 R     21.42  0.17   22.4

The photometry is based on nearby SDSS-DR12 stars.
SDSS-DR12
RA DEC R(Lupton transformations)
16:31:20.4491016 +26:24:03.644928 18.124
16:31:41.2384008 +26:20:23.267580 17.545
16:31:32.6899656 +26:20:16.058832 18.238
16:31:31.3849992 +26:19:27.712488 18.804