[vsnet-grb-info 4184] GRB 070103: TAROT Calern observatory optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  5989
SUBJECT: GRB 070103: TAROT Calern observatory optical observations
DATE:    07/01/03 21:16:26 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 070103 detected by SWIFT
(trigger 254532) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 23.3s after the GRB trigger
(8.4s after the notice). The elevation of the field decreased from
from 32 degrees above horizon and weather conditions
were good.

The date of trigger : t0 = 2007-01-03T20:46:39.072

The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+23.3s to t0+83.3s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+89.7s to t0+119.7s : R > 15.9

We co-added a series of exposures:
t0+89.7s to t0+229.0s : R > 16.4

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

N.B. Galactic coordinates are lon=101.3840 lat=-32.5757
and the galactic extinction in R band is 0.1 magnitude
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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