GCN Circular 21381
Subject
GRB 170728B: I-band detection from 1.5m OSN
Event
Date
2017-07-29T14:31:54Z (9 years ago)
From
Luca Izzo at IAA-CSIC <Luca.Izzo@ICRA.it>
L. Izzo, D.A. Kann (HETH/IAA-CSIC), A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), C. C. Thoene (HETH/IAA-CSIC) and A. Sota (IAA-CSIC) report on behalf of a larger collaboration:
We observed the field of GRB 170728B (Cenko et al., GCN 21371) with the 1.5m OSN telescope of the Sierra Nevada Observatory (Granada, Spain). Observation consisted of a series of 300 s Ic-band exposures, starting at 00:06:02.7 UT (1.05 hr after the burst). The afterglow is detected at a position consistent with the one reported by D���Avanzo et
al., (GCN 21373).
In the combination of the first 7x300s exposures we measure a magnitude of Ic(Vega) = 19.8+/- 0.2 as compared to USNO-B1 stars.