[vsnet-grb-info 5982] GRB 080413B: Faulkes Telescope South optical afterglow observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7626
SUBJECT: GRB 080413B: Faulkes Telescope South optical afterglow observations
DATE:    08/04/16 17:48:34 GMT
FROM:    Andreja Gomboc at LT,ARI,Liverpool JMU  <ag at astro.livjm.ac.uk>

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

The 2-m Faulkes Telescope South observed the field of GRB 080413B
(trigger=309111, Stamatikos et al. GCN 7598) starting 8.7-hr after the 
trigger time.
We detect the optical afterglow (Stamatikos et al. GCN 7598, Kruehler et al.
GCN 7599, Antonelli et al. GCN 7600) and measure the following magnitudes:

Filter   T_mid(hr)    Exposure(s)       Mag
----------------------------------------------------------------------
R          8.74          30          19.00 +/- 0.15
I          8.90         640          18.91 +/- 0.05
I          9.20        1080          19.15 +/- 0.05
I          9.54        1080          19.22 +/- 0.06
----------------------------------------------------------------------

Magnitudes were calibrated with respect to USNOB1 R2 and I.