Home: The Explosive TransientCamera
Searches for Optical Counterparts
of BATSE Gamma-ray Bursts with the Explosive Transient Camera
Hans A. Krimm, Roland K. Vanderspek
and George R. Ricker
Department of Physics and Astronomy, Hampden-Sydney College
Hampden-Sydney, VA 23943 U.S.A.
Center for Space Research and Department of Physics
Massachusetts Institute of Technology
Cambridge, MA 02139 U.S.A.
The Explosive Transient Camera (ETC) is a wide-field CCD camera
of detecting short (1-10 s) celestial optical flashes as faint as m ~10
over a field-of-view of 0.75 steradians between -15 and +62 degrees
declination. The ETC has been operating automatically under computer control
since January 1991.
Since the launch of the Compton Gamma Ray Observatory,
the ETC has been capable of observing an
optical flash coincident with a gamma-ray burst (GRB) detected by the
Burst and Transient Source Experiment (BATSE).
Between April 1991 and August 1995, there were seven cases of at least
partial spatial overlap between a BATSE 68% confidence positional error box
and the ETC field-of-view during an ETC observation. In each case
upper limits are placed on the optical-to-gamma-ray flux ratio.
Thu Jun 13 14:06:17 EDT 1996