GCN Circular 15422
V. Terron (IAA-CSIC), J. Gorosabel (IAA-CSIC,UPV/EHU), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), A.J. Castro-Tirado (IAA-CSIC), A. Sota (IAA-CSIC), report on behalf of a larger collaboration: We imaged the field of the GRB131031A (Cummings GCN 15421) with the 1.23m CAHA telescope. The observations were carried out at 21:24--22:04 UT (mean epoch 10.2 hours post burst) in the I-band with a total exposure time of 7x300s. Visual comparison with the SDSS did not reveal new objects brighter than I~20.5 (Vega) within the BAT error circle. A contemporaneous 900s R-band image taken with the 1.5m OSN telescope did not reveal any new object either brighter than R>19.5 (Vega).