TITLE:   GCN CIRCULAR
NUMBER:  18961
SUBJECT: GRB 160131A: TNG optical observations
DATE:    16/01/31 20:10:52 GMT
FROM:    Andrea Melandri at INAF-OAB  <andrea.melandri@brera.inaf.it>

A. Melandri, P. D'Avanzo (INAF/OAB), V. D'Elia (INAF/OAR and ASI/ASDC), L. Di Fabrizio, G. Mainella (INAF/TNG) report on behalf of the CIBO collaboration:

We observed the field of GRB 160131A (Page et al., GCN 18951) with the 3.6m TNG telescope equipped with the DOLoRes camera in imaging mode. Observations started on 2016 Jan 31 at 19:52 UT and consisted of two images (120s each) obtained with the R filter.

The optical afterglow (Page et al., GCN 18951; Yurkov et al. GCN 18952; Guidorzi et al. GCN 18953; Xin et al., GCN 18954, GCN 18955; Watson et al. GCN 18956; Xu et al. GCN 18957) is clearly detected. From a preliminary analysis, we estimate a magnitude of R=18.1 +/- 0.1, calibrated against the USNO-B1 catalogue.