[AAVSO-HEN] GRB 070808 : Faulkes Telescope South Observations

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
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TITLE:   GCN CIRCULAR
NUMBER:  6727
SUBJECT: GRB 070808 : Faulkes Telescope South Observations
DATE:    07/08/09 16:43:13 GMT
FROM:    Andrea Melandri at Liverpool John Moores U  <axm at astro.livjm.ac.uk>

A. Melandri, (Liverpool JMU), C. Guidorzi (Uni-Bicocca/INAF-OAB),
R.J. Smith, I.A. Steele, C.G. Mundell, M.J. Burgdorf, C.J. Mottram,
M.F. Bode, S.N. Fraser, S. Kobayashi, D.F. Bersier (Liverpool JMU),
A. Gomboc (Ljubljana), P. O'Brien, E. Rol, N. Bannister, N. Tanvir
(U. Leicester) report on behalf of larger GRB collaboration :


On 2007 Aug 08 at 18:30:21 UT the Faulkes Telescope South automatically
observed the field of GRB 070808 (trigger=287260, Cummings et al.,
GCN 6718).

On our coadded frames we do not detect any source inside the refined
XRT error circle (Starling et al., GCN 6725) down to a limiting
magnitude of


Filter  Tstart(min)  Tstop(min)    Exposure(s)   M_lim
---------------------------------------------------------
   R       2.35          62.9          960         20.6
   i'      5.55          53.4          700         20.5
---------------------------------------------------------

Magnitudes are calibrated with respect to USNOB1 R2 in the R filter.
For the SDSS-i' filter we used the magnitude derived from the
pre-burst calibration field of Cool et al. (GCN 6720).