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GCN Circular 15039

GRB130725B: REM-ROS2 optical observations
2013-07-26T13:48:28Z (11 years ago)
Dino Fugazza at INAF-OAB <>
D. Fugazza, S. Covino, G. Tagliaferri (INAF-OAB), V. D'Elia (INAF-OAR) 
report on behalf of the CIBO team:

We observed the field of GRB 130725B (Swenson et al., GCN 15029) 
simultaneously in the optical and near-infrared with the the 60-cm 
robotic telescope REM at La Silla Observatory (Chile). The observations 
started at 23:41:40 UT on July 25 2013, about 6.03 hours after the GRB 
and lasted for about 45 min.
We detect the afterglow reported by Siegel et al. (GCN 15032) and Tanga 
et al. (GCN 15034) with the upgraded ROS2 optical camera. In the NIR 
with REMIR camera the afterglow was not detected.
ROS2 is able to observe simultaneously in the g', r', i', and z' filters 
and preliminary magnitudes (AB) are:

g' = 20.65 � 0.07
r' = 20.32 � 0.07
i' = 20.08 � 0.09

The magnitudes are calibrated against the APASS catalogue.
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