[AAVSO-HEN] GRB 090709A: NOT optical observations

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TITLE:   GCN CIRCULAR
NUMBER:  9644
SUBJECT: GRB 090709A: NOT optical observations
DATE:    09/07/10 00:10:54 GMT
FROM:    Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst  <malesani at astro.ku.dk>

D. Malesani (DARK/NBI), J. Telting (NOT), P. Wilson (NOT and Univ. 
Oslo), P. Jakobsson (Univ. Iceland), J.P.U. Fynbo, G. Leloudas 
(DARK/NBI), A.J. Levan (Univ. Warwick), and K. Wiersema (Univ. 
Leicester), report on behalf of a larger collaboration:

We observed the field of GRB 090709A (Morris et al., GCN 9625) with the 
NOT equipped with ALFOSC. Observations were carried out in the R band, 
starting on 2009 Jul 9.943 (14.97 hr after the trigger), for a total 
exposure time of 30 min.

At the position of the NIR transient (Aoki et al., GCN 9634; Morgan et 
al., GCN 9635) we do not detect any source, down to a limiting magnitude 
R >~ 24. The calibration is based on a number of closeby USNO-B1 stars 
(R2 magnitudes).