[AAVSO-HEN] GRB 080805: GROND detection of possible afterglow

[grb at aavso.org]

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TITLE:   GCN CIRCULAR
NUMBER:  8060
SUBJECT: GRB 080805: GROND detection of possible afterglow
DATE:    08/08/05 08:42:10 GMT
FROM:    Jochen Greiner at MPI  <jcg at mpe.mpg.de>

T. Kruehler, F. Schrey, J. Greiner, C. Clemens, A. Yoldas (all MPE 
Garching),
A. Kupcu Yoldas (ESO) and G. Szokoly (Eoetvoes Univ., Budapest) report on
behalf of the GROND team:

GROND (Greiner et al. 2008, PASP 120, 405), mounted at the 2.2m ESO/MPI 
telescope at La Silla Observatory (Chile), started observations of the 
field of GRB 080805 (Pagani et al. 2008, GCN #8059) in g'r'i'z'JHK at 
07:45 UT, 3.5 min after the burst. We detect an optical/NIR afterglow 
candidate in the XRT error circle (Pagani et al. 2008, GCN #8059) in 
griz at:

RA(J2000): 20h 56m 53.44
DEC(J2000): -62d 26' 39.8"

with uncertainties of 0.5".

We measure the following magnitudes, calibrated against USNO-B1 field stars:

g = 21.7 +- 0.2
r = 20.5 +- 0.1
i = 20.1 +- 0.1
z = 19.9 +- 0.1

No statement about fading can be made at the moment. If this is the
afterglow of GRB 080805, then its redshift is smaller than 3.5.