Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 15422

GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
2013-10-31T23:28:53Z (11 years ago)
Javier Gorosabel at IAA-CSIC <>
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).
Looking for U.S. government information and services? Visit