Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe..81r&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
The Low Energy Gamma-ray (LEG) instrument of the proposed GRISP project consists of 3 low background good energy resolution NaI(Tl)/CsI(Na) phoswich detectors with different fields of view. These detectors will have restricted field of view (typically 10 degrees) and lower energy threshold and much lower background rates compared to the BATSE detectors. The sensitivity for GRB detection will be ~10^{-8} erg cm^{-2}. A substantial fraction (about 35%) of GRBs have softer spectrum with E_0 < 100 keV. If one takes the Band model with alpha = 3D -1.25; beta = 3D -2.5; E_0 = 3D 50 keV, the detection thresholds reduces to 5 times 10^{-9} erg cm^{-2}. It is expected that the experiment will detect about 30 GRBs (due to the restricted field of view) which will be very useful in constraining the lower end of the log N/ Log S distribution of GRBs.
Rao Ravi A.
Vahia Mayank N.
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