TITLE: GCN CIRCULAR NUMBER: 18964 SUBJECT: GRB 160131A: Bassano Bresciano Observatory optical observations DATE: 16/01/31 20:48:03 GMT FROM: Ulisse Quadri at Bassano Bresciano Obs U.Quadri, L.Strabla and R.Girelli report: We imaged the field of GRB 160131A (Page et al., GCN Circular 18951) with the robotic telescope of (IAU station 565) Bassano Bresciano Observatory, Italy (member of ISSP:Italian Supernovae Search Project) The observations started 9.18 hour after the GRB trigger, at the end of twilight, with our Newton telescope D=250 mm F/D=4.8 Initially weather conditions were good, but then the fog has forbidden the observations. We co-added 2 series of 10 exposures of 60 sec each: Start T0 + 9.18 hour. End T0+ 9.87 hour We clearly detect the optical counterpart (Page et al., GCN 18951; Yurkov et al., GCN 18952; Guidorzi et al., GCN 18953;Xin et al., GCN 18954; Xin et al., GCN 18955; Watson et al., GCN 18956). at the following coordinates: 05h 12m 40.37s -07d 02m 58.9s +/-2 arcsec Photometry was performed using comparison stars with UCAC4 catalog. in CV (clear + Jhonson V) and CR (Clear + Jhonson R) magnitudes, and are not corrected for galactic dust extinction: ------------------------------------ JD Mag Filter SNR ------------------------------------ 2457419.24025 17.360 CR 14.34 2457419.26062 17.241 CR 9.74 2457419.24025 17.671 CV 14.40 2457419.26062 17.498 CV 9.74 ------------------------------------- The images are available at: http://www.osservatoriobassano.org/GRB.asp The message may be cited.