GCN Circular 19143

A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), C.C. Thoene (IAA-CSIC),
V. Casanova (IAA-CSIC) report on behalf of a larger collaboration:

We observed the field of the possibly short GRB 160303A (Beardmore et al., 
GCN 19126
Not found
 
 
) with the 1.5 m OSN telescope (Sierra Nevada Observatory, 
Granada, Spain). Observation consisted of 15x300s exposures in R-band, 
ranging from 01:37-3:00 UT (mean epoch at 15.41 hr after the burst).

In the combined image the GRB afterglow (Butler et al., GCN 19131
Not found
 
 
; Emery 
et al. GCN 19134
Not found
 
 
; de Ugarte Postigo, GCN 19136
Not found
 
 
; Jeong et al. GCN19140
Not found
 
 
; 
Im et al. GCN 19141
Not found
 
 
; Klose et al. GCN 19142
Not found
 
 
) is seen at a magnitude of 
r(AB) = 23.67 +/- 0.27 as compared to SDSS stars.

This seems to indicate confirm the decay as compared with the data of 
RATIR (Butler et al., GCN 19131
Not found
 
 
), NOT (de Ugarte Postigo, GCN 19136
Not found
 
 
) and
CQUEAN (Jeong et al. GCN19140
Not found
 
 
), BOAO (Im et al. GCN 19141
Not found
 
 
) and FORS
(Klose et al. GCN 19142
Not found
 
 
). In any case the possible decay would be shallower
than the typical GRB, with a decay slope of alpha ~ 0.5 (F_nu ~ t^-alpha).