Issue |
Astron. Astrophys. Suppl. Ser.
Volume 138, Number 3, September 1999
Gamma-Ray Bursts in the Afterglow Era Contents Rome, November 3-6, 1998
|
|
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Page(s) | 599 - 600 | |
DOI | https://doi.org/10.1051/aas:1999368 | |
Published online | 15 September 1999 |
Search for GeV GRBs with the INCA experiment
1
Instituto de Investigaciones Fisicas, Universidad Mayor de San Andres, La Paz, Bolivia
2
Istituto di Cosmo-Geofisica del CNR, Torino, Italy
3
Istituto Nazionale di Fisica Nucleare, Torino, Italy
4
Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152, Japan
5
Department of Physics, Okayama University, Okayama 700, Japan
6
Dipartimento di Fisica Generale dell' Università, Torino, Italy
7
The Institute of Physical and Chemical Research, Wako, Saitama 351-01, Japan
8
Department of Physics, Ehime University, Ehime 790, Japan
Send offprint request to: S. Vernetto
Received:
18
December
1998
Accepted:
10
March
1999
INCA is an air shower array located at Mount Chacaltaya in Bolivia,
at 5200 m a.s.l., searching for Gamma Ray Bursts of energy GeV.
The results presented here concern a GRB search made in correlation
with 70 events recorded by BATSE since December 1996 to August 1998.
For every burst, the INCA counting rate has been studied both during
the BATSE detection time and in 2 hours around.
No significant excess has been found in any of the trials.
Assuming for the burst a power low energy spectrum extending up to 1 TeV
with a slope
and a time duration of 10 s,
the obtained
energy fluence upper limits range from
to
depending on the event zenith angle.
Key words: gamma-ray bursts
© European Southern Observatory (ESO), 1999