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GCN Circular 14592

Subject
GRB 130427A: Tautenburg afterglow observations
Date
2013-05-06T22:41:33Z (11 years ago)
From
Alexander Kann at TLS Tautenburg <kann@tls-tautenburg.de>
D. A. Kann, B. Stecklum, and F. Ludwig (TLS Tautenburg) report:

We observed the optical afterglow (Elenin et al., GCN 14450) of the nearby
(Levan et al., GCN 14455), extremely bright GRB 130427A (Maselli et al.,
GCN 14448; Zhu et al., GCN 14471; von Kienlin, GCN 14473; Golenetskii et
al., GCN 14487) with the 1.34m Schmidt telescope of the Thueringer
Landessternwarte Tautenburg equipped with a 4k CCD camera under good
weather conditions. We obtained 3 x 600 sec frames in the Rc band. The
afterglow is detected in each frame.

Using the nearby star given in Rumyantsev et al. (GCN 14582), we derive a
preliminary magnitude of Rc = 20.27 +/- 0.07 at 8.55173 days after the
GRB.

This value is in good agreement with detections from the last few days
(Kuroda et al., GCN 14534; Rumyantsev et al., GCN 14582). The afterglow
does not yet show clear signs of flattening associated with either a
rising supernova component or a significant contribution from the
underlying host galaxy.

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