[vsnet-grb-info 12511] GRB 121017A: 1.23m CAHA R-band observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  13878
SUBJECT: GRB 121017A: 1.23m CAHA R-band observations
DATE:    12/10/18 00:31:03 GMT
FROM:    Javier Gorosabel at IAA-CSIC  <jgu at iaa.es>

J. Gorosabel (IAA-CSIC, Granada), S. Mottola (DLR, Berlin), report on
behalf of a larger collaboration:

"We imaged the field of the Swift GRB 121017A (Grupe et al., GCN Circ.
13875) with the 1.23m Calar Alto telescope. The observations were carried
out in the R-band on Oct. 17.85440--17.86153 UT (1.11--1.29 hours post
burst) with a total exposure time of 2x300s. No optical source brighter
than R~20 was found within the XRT error circle."