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GCN Circular 22448

Subject
GRB 180224A: AbAO optical observations
Date
2018-02-25T20:06:13Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI),  A. Pozanenko (IKI),  A. Volnova  (IKI), R. Inasaridze 
(AbAO),  V. Ayvazian  (AbAO),  O. Kvaratskhelia (AbAO), G. Inasaridze 
(AbAO),  I. Molotov (KIAM), report on behalf of larger GRB follow-up 
collaboration:

We observed the field of GRB 180224A  (Lien  et al., GCN 22442) with AS-32 
(0.7m) telescope of Abastumani Observatory starting on Feb. 25  (UT) 
01:07:37.   The afterglow of GRB 180224A (Lien  et al., GCN 22442; 
Vladimirov et al., GCN 22444) is  clearly detected in a stacked image. 
Preliminary photometry is following.

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

2018-02-25  01:07:37   0.15162   CR     60*60  21.88   0.15  22.6

The photometry is based on nearby SDSS DR9 stars

SDSS_id                            R_Lupton
J133038.17+380528.6    17.45
J133040.16+380535.7    17.10
J133051.85+380146.4    17.91

We confirm the fast decay of the afterglow and possible host galaxy 
association  SDSS DR9 J133044.06+380443.0 with the afterglow source (Watson 
et al., GCN 22446).
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