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GCN Circular 26013

GRB 191016A: Optical limit by Ondrejov D50
2019-10-16T21:55:29Z (5 years ago)
Martin Jelinek at Astro.Inst-AVCR,Ondrejov <>
Martin Jelinek and Jan Strobl (ASU CAS Ondrejov, CZ)

We observed GRB 191016A (Gropp et al. GCNC 26008) with the 50 cm robotic
telescope (D50) of Ondrejov observatory in the Czech Republic, obtaining a
series of 120s images starting at 17:55UT, i.e. 13.6h post trigger.

We do not detect the optical afterglow (Watson, GCNC 26010; Zheng et al.,
GCNC 26011 and others) in a combined 60x120s I-band image with exposure
mean time 14.6h after the GRB. A rough conservative detection limit of the
image is I(Vega) > 19.5; as mentioned before by Zheng et al., the proximity
of Moon makes any photometric measurement difficult.
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