[vsnet-grb-info 16197] GRB 150213B: AAO photometry

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17478
SUBJECT: GRB 150213B: AAO photometry
DATE:    15/02/19 16:49:54 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

A. Volnova (IKI), A. Pozanenko (IKI), E. Mazaeva (IKI), R. Inasaridze 
(AAO), Sh. Makandarashvili (AAO),  Molotov (KIAM), report on behalf of 
larger GRB follow-up collaboration:

We report photometry of our observation (GCN 17468) of the field of the 
Swift GRB 150213B (Pagani et al., GCN 17464) with AS-32 (0.7m) telescope 
of Abastumani Observatory.  The optical afterglow (Pagani et al., GCN 
17464; Kann et al., GCN 17465; Malesani et al., GCN 17467) is visible on 
single images. The photometry of the afterglow  is following

Date       UT start   t-T0     Filter   Exp.    OT   Err.
                       (mid, days)       (s)
2015-02-13  23:22:23 0.03696   none     2*120  18.98 0.14
2015-02-13  23:27:43 0.04345   none     5*120  19.15 0.10
2015-02-13  23:41:05 0.05273   none     5*120  19.56 0.13
2015-02-13  23:54:27 0.06201   none     5*120  19.12 0.13
2015-02-13  24:07:49 0.07593   none     10*120 19.12 0.06
2015-02-13  24:34:32 0.09634   none     12*120 19.20 0.08

The photometry might be affected by the presence of the nearby bright 
star (e.g., Kann et al., GCN 17465). The photometry is based on nearby 
SDSS DR9 stars:

SDSS9_id            R(Lupton)
J165343,83+341043,0 16,49
J165348,15+341040,4 15,99
J165354,27+341137,8 17,87
J165339,38+341103,1 17,14
J165341,19+341135,8 14,53