TITLE:   GCN CIRCULAR
NUMBER:  34077
SUBJECT: ATLAS23msn/ZTF23aaoohpy/AT2023lcr: Zeiss-1000 of Koshka observatory optical observations
DATE:    23/06/24 19:39:55 GMT
FROM:    Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>

S. Belkin (IKI, HSE), I. Sokolov (KIAM), I. Nikolenko (INASAN), 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 Zeiss-1000 telescope of Koshka observatory in R-filter on 2023-06-20 and 2023-06-23. 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; Belkin et al., GCN 34047; Breeveld, GCN 34049; Leonini et al., GCN 34052; Moskvitin et al., GCN 34060) on 2023-06-20 and obtained an upper limit on 2023-06-23. Preliminary photometry of a stacked images is following

Date        UT start  MJD             Exp.   Filter OT     Err.   UL(3sigma)
                      (mid exposure)   (s)                                  
2023-06-20  19:14:22  60115.83567130  49*120 R      21.31  0.18   22.2
2023-06-23  18:43:28  60118.80657407  38*120 R      n/d    n/d    21.7

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