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GCN Circular 19928

GRB 160917A: OSN I-band upper limits
2016-09-17T20:49:18Z (8 years ago)
Zach Cano at U of Iceland <>
A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), Z. Cano (IAA-CSIC) & F. Aceituno
(IAA-CSIC) report on behalf of a larger collaboration:

We observed the field of GRB 160917A (Racusin et al.; GCN Circ. 19926) with
the 1.5-m OSN telescope in Granada, Spain.  We began observing at 19:08:34
UT (7.64 hours after the GRB onset), and obtained 14x300s images in
I-band.  In our coadded image, we find no new source in the refined XRT
error circle (Evans et al; GCN Circ. 19927) down to a a 3-sigma limit of
I(Vega) = 22.6.  The calibration was performed using a nearby star in the
USNO B1 catalog, and the upper limit corresponds to an isolated point
source in our co-added image.
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