[vsnet-grb-info 15176] GRB 140622A: TAROT La Silla observatory optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16468
SUBJECT: GRB 140622A: TAROT La Silla observatory optical observations
DATE:    14/06/28 16:14:27 GMT
FROM:    Alain Klotz at IRAP-CNRS-OMP  <Alain.Klotz at free.fr>

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 140622 detected by SWIFT
(trigger 602278) with the TAROT robotic telescope (D=25cm)
located at the European Southern Observatory,
La Silla observatory, Chile.

The observations started 23.2s after the GRB trigger
(12.7s after the notice). The elevation of the field decreased from
61 degrees above horizon and weather conditions
were excellents. Images were not accessible during one week
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+23.2s to t0+83.2s : R > 17.5

The second image is 30.0s exposure in tracking mode:
t0+96.6s to t0+126.6s : R > 18.0

We co-added a series of exposures:
t0+96.6s to t0+389.1s : R > 18.4

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