Chen, SZ (reprint author), Chinese Acad Sci, Key Lab Particle Astrophys, Inst High Energy Phys, POB 918, Beijing 100049, Peoples R China.
The ARGO-YBJ (Astrophysical Radiation Ground-based Observatory at YangBajing) experiment is designed for very high energy gamma-astronomy and cosmic ray researches. Due to the full coverage of a large area (5600 m(2)) with resistive plate chambers at a very high altitude (4300 m a.s.l.), the ARGO-YBJ detector is used to search for transient phenomena, such as Gamma-ray bursts (GRBs). Because the ARGO-YBJ detector has a large field of view (similar to 2 sr) and is operated with a high duty cycle (>90%), it is well suited for GRB surveying and can be operated in searches for high energy GRBs following alarms set by satellite-borne observations at lower energies. In this paper, the sensitivity of the ARGO-YBJ detector for GRB detection is estimated. Upper limits to fluence with 99% confidence level for 26 GRBs inside the field of view from June 2006 to January 2009 are set in the two energy ranges 10-100 GeV and 10 GeV-1 TeV. (C) 2009 Elsevier B.V. All rights reserved.