GCN Circular 21372
Subject
GRB 170728B: TNG optical afterglow candidate
Date
2017-07-29T01:16:51Z (7 years ago)
From
Paolo D'Avanzo at INAF-OAB <paolo.davanzo@brera.inaf.it>
P. D'Avanzo (INAF-OAB), V. D'Elia (INAF/OAR & ASI/ASDC), M. Cecconi, H. Stoev (INAF-TNG)
report on behalf of the CIBO collaboration:
We observed the field of the short GRB 170728B (Cenko et al., GCN Circ. 21371) with the 3.6m
Telescopio Nazionale Galileo (TNG) equipped with DOLoRes. Observations were carried out in
the r-sdss filter. Observations started Jul 28 at 23:55:49 UT (~52.5 minutes after the burst) and
consist in a single image lasting 300 seconds.
Inside the enhanced XRT position (http://www.swift.ac.uk/xrt_positions/) we detect a candidate optical
afterglow. From preliminary photometry we estimate a magnitude r(AB)~20.6 (calibrated against nearby
stars reported in the PAN-STARSS catalogue).