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GCN Circular 16469

GRB 140626A: TAROT La Silla observatory optical observations
2014-06-28T16:54:48Z (10 years ago)
Alain Klotz at IRAP-CNRS-OMP <>
Klotz A., Turpin D. (IRAP-CNRS-OMP),
Boer M., Gendre B., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA),
Atteia J.L. (IRAP-CNRS-OMP) report:

We imaged the field of GRB 140626A detected by SWIFT
(trigger 602604) with the TAROT robotic telescope (D=25cm)
located at the European Southern Observatory,
La Silla observatory, Chile.

The observations started 72.1s after the GRB trigger
(15.9s after the notice). The elevation of the field decreased from
23 degrees above horizon and weather conditions
were good. Images were not accessible during two days
due to a disk access problem.

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+72.1s to t0+132.1s : R > 16.6

The second image is 30.0s exposure in tracking mode:
t0+145.4s to t0+175.4s : R > 17.6

We co-added a series of exposures:
t0+145.4s to t0+437.3s : R > 19.2

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