[AAVSO-HEN] GRB 080207: GROND upper limits

[grb at aavso.org]

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TITLE:   GCN CIRCULAR
NUMBER:  7279
SUBJECT: GRB 080207: GROND upper limits
DATE:    08/02/09 22:48:33 GMT
FROM:    Jochen Greiner at MPI  <jcg at mpe.mpg.de>

A. Kuepcue Yoldas, A. Yoldas, J. Greiner, T. Kruehler (all MPE Garching),
S. Klose (Tautenburg Obs), G. Szokoly (Budapest Univ.) report for the
GROND team:

We observed the field of GRB 080207 detected by Swift/BAT (Racusin et al.
2008, GCN 7264)  simultaneously in grizJHK with GROND (Greiner et al. 2008,
astro-ph/0801.4801), mounted at the 2.2m MPI/ESO telescope at La Silla (Chile).
Observations started on Feb. 08, at 06:35 UT, about 9 hrs after the GRB,
under poor conditions (particularly high humidity and airmass of 1.7-1.34).

No source is detected within the 3-sigma XRT error circle (Beardmore et al.
2008, GCN 7265). Comparison of the co-added images (with 3440 sec effective
exposure time in griz and 2400 seconds in JHK) to the Digital Sky Survey 
and 2MASS yields the following 3-sigma upper limits:
g' > 23.9,  r' > 23.8,  i' > 23.5,  z' > 22.8,  J > 21.0,  H > 19.7,  K > 19.0.