TITLE:   GCN CIRCULAR
NUMBER:  14593
SUBJECT: GRB 130505A: Tautenburg afterglow observations
DATE:    13/05/06 22:41:36 GMT
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 (Cannizzo et al., GCN 14563) of the
extremely luminous GRB 130505A (Cannizzo et al., GCN 14563; Golenetskii et
al., GCN 14575) 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 300 sec frames in the Rc band. The
afterglow is detected in each frame.

For a nearby SDSS star (RA = 137.082047, Dec. = 17.486120), using the
transformations of Lupton (2005), we find: B = 18.118, V = 17.080, Rc =
16.501, Ic = 15.967.

Using this star for calibration, we derive a preliminary magnitude of Rc =
19.09 +/- 0.06 at 0.49118 days after the GRB.

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