[vsnet-grb-info 23829] LIGO/Virgo S190930t: AT2019rpn, AT2019rpj CrAO optical photometry

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  25928
SUBJECT: LIGO/Virgo S190930t: AT2019rpn, AT2019rpj CrAO optical photometry
DATE:    19/10/02 19:14:59 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI), V. Rumyantsev (CrAO),  A. Pozanenko (IKI),   A. 
Volnova (IKI), S. Belkin (IKI) report on behalf of larger GRB follow-up 
collaboration:

We observed the ZTF19acbpqlh (AT2019rpn) reported by Stein et al. (GCN 
25899) and the ATLAS19wyn (AT2019rpj) optical transients with ZTSh 2.6m 
telescope of CrAO observatory starting on Oct. 01 (UT) 19:30:53. We took 
several images in B,R filters  under good conditions and mean seeing of 
1.5 arcsec. Both optical transients are clearly visible in separate images.

Preliminary photometry of the optical transients   is following

Name,     UT start             T_mid Filter  Exp.     OT    err
                                (MJD)         (s)

AT2019rpj 2019-10-01 20:16:16  58757.84880 R 11*60   19.37   0.04
AT2019rpj 2019-10-01 20:28:33  58757.85886 B 15*60   19.86   0.04
AT2019rpn 2019-10-01 19:30:53  58757.81861 R 12*60   19.26   0.11
AT2019rpn 2019-10-01 19:47:03  58757.83270 B 11*60   20.17   0.07

The photometry for AT2019rpj is based on the stars:
SDSS-DR12_id RA Dec R(Lupton) err B(Lupton) err
J223926.51+313057.4    339.860475    +31.515949    17.94    0.02 
19.23    0.02
J223929.26+313022.7    339.871951    +31.506316    16.89    0.02 
18.52    0.01
J223919.69+312904.5    339.832062    +31.484605    18.69    0.02 
19.83    0.02
J223916.31+313047.2    339.817967    +31.513116    18.71    0.02 
19.97    0.02

The photometry for AT2019rpn is based on the stars:
Pan-STARRS_id RA Dec R(Lupton) err B(Lupton) err
153053199373132992    319,937282460    +37,543645500    15.64    0.01 
16.79    0.01
153013199432441728    319,943228690    +37,509269790    17.25    0.01 
18.50    0.01
153013199414348544    319,941391010    +37,514951160    17.04    0.01 
18.44    0.01
153003199240135584    319,924010430    +37,504130480    16.52    0.01 
17.89    0.01
153043199658230976    319,965800600    +37,533607760    16.10    0.01 
17.57    0.01