Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 14033

GRB 121202A: TAROT Calern observatory optical observations
2012-12-02T05:09:10Z (11 years ago)
Alain Klotz at CESR-CNRS <>
Klotz A. (IRAP-CNRS-OMP), Gendre B. (ASDC/INAF-OAR),
Boer M. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report:

We imaged the field of GRB 121202 detected by SWIFT
(trigger 540255) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 34.0s after the GRB trigger
(15.8s after the notice). However, the elevation of the field
increased from 1 degrees above horizon so it was possible
to detect stars on images only 275s after the trigger.

The first image does not show any optical counterpart:
t0+275s to t0+305s : R > 14.9

We co-added series of exposures:
t0+275s to t0+1419s : R > 16.2
t0+1633s to t0+2578s : R > 16.9

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

N.B. Galactic coordinates are lon= 45.1864 lat=+32.8357
and the galactic extinction in R band is about 0.1 magnitude
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.
Looking for U.S. government information and services? Visit