[AAVSO-HEN] GRB070518: OSN observation

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
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TITLE:   GCN CIRCULAR
NUMBER:  6418
SUBJECT: GRB070518: OSN observation
DATE:    07/05/19 01:04:27 GMT
FROM:    Martin Jelinek at Inst.Astrophys.Andalucia,Granada  <mates at iaa.es>

Martin Jelinek, Alberto J. Castro-Tirado, Victor Casanova,
Javier Gorosabel, Antonio de Ugarte Postigo, Stanislav Vitek,
Ronan Cunniffe and Petr Kubanek (IAA CSIC Granada, Spain)

report

We observed the optical afterglow of GRB070518 (Guidorzi et
al, GCN6415) with a 1.5m telescope at Observatorio Sierra
Nevada using R and I-band filters. The afterglow is found to
have R~22.2, relatively to the nearby USNO-A2.0 (R_usno=18.7)
on a 60-minute combined image with exposure mean time 23:04UT
(i.e. 8.6h after the GRB). 

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