[vsnet-grb-info 5951] GRB 080413: TAROT Calern observatory optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7595
SUBJECT: GRB 080413: TAROT Calern observatory optical observations
DATE:    08/04/13 03:54:16 GMT
FROM:    Alain Klotz at CESR-CNRS  <Alain.Klotz at free.fr>

Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:

We imaged the field of GRB 080413 detected by SWIFT
(trigger 309096) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 21.8s after the GRB trigger
(8.3s after the notice). The elevation of the field increased from
from 11 degrees above horizon and weather conditions
were poor at the beginning of observations. The first
image showing stars started 480s after the trigger.

We detected the candidate couterpart mentioned by Rykoff
et al. (GCNC 7593) at the following position (+/- 2 arcsec):

RA(J2000.0) = 19h 09m 11.85s
DEC(J2000.0) -27d 40' 43.0"

Unfiltered magnitudes are:
t0+480s to t0+570s : R > 12.5
t0+1174s to t0+1263s : R = 15.0 +/- 0.2
t0+1470s to t0+1650s : R = 15.3 +/- 0.2
t0+2035s to t0+2215s : R = 15.5 +/- 0.2


Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.

N.B. Galactic coordinates are lon=  9.5236 lat=-15.8249
and the galactic extinction in R band is 2.4 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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