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GCN Circular 21372

GRB 170728B: TNG optical afterglow candidate
2017-07-29T01:16:51Z (7 years ago)
Paolo D'Avanzo at INAF-OAB <>
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 ( 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).
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