[AAVSO-HEN] GRB 090516: Observations from Stardome Observatory

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The following is a GCN Circular circulated via the AAVSO network.
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TITLE:   GCN CIRCULAR
NUMBER:  9396
SUBJECT: GRB 090516: Observations from Stardome Observatory
DATE:    09/05/19 06:10:37 GMT
FROM:    Antonio Deugarte at IAA-CSIC  <deugarte at iaa.es>

G. W. Christie (Stardome, New Zealand), A. de Ugarte Postigo
(ESO, Chile) and  T. Natusch (Stardome, New Zealand) on
behalf of a larger collaboration report:

We observed the field of GRB 090516 (Rowlinson et al. GCN
9374) with the Stardome 0.4m telescope located in Auckland
(New Zealand) starting at 09:25UT. We used a SG530 filter
that transmits wavelengths above 5300 Angstroms and a SBIG
ST-L-6303E CCD (KAF-6303E detector). A 9x300s combined
exposure with mean epoch 16.4080 May (80 minutes after the
burst) shows an object at the position of the afterglow
(Guidorzi et al. GCN 9375) measured at R = 20.8 +/- 0.2 as
compared to USNO-B1.0 stars.  We note that with the GRB at
a redshift of 4.1 (de Ugarte Postigo et al. GCN 9383),
Ly-alpha falls within the R-band, so that comparison of
clear and very broad band filters such as ours with R-band
has to be handled with care.