AN EPISODE OF ULTRAHIGH-ENERGY RADIATION FROM THE GAMMA-RAY SOURCE GEMINGA - GRAPES-I OBSERVATIONS AT OOTY DURING 1984-1987

Authors
GUPTA SK SREEKANTAN BV SRIVATSAN R TONWAR SC
Citation
Sk. Gupta et al., AN EPISODE OF ULTRAHIGH-ENERGY RADIATION FROM THE GAMMA-RAY SOURCE GEMINGA - GRAPES-I OBSERVATIONS AT OOTY DURING 1984-1987, Physical review. D. Particles and fields, 48(8), 1993, pp. 3463-3466
Citations number
18
Categorie Soggetti
Physics, Particles & Fields
Journal title
Physical review. D. Particles and fields → ACNP
ISSN journal
05562821
Volume
48
Issue
8
Year of publication
1993
Pages
3463 - 3466
Database
ISI
SICI code
0556-2821(1993)48:8<3463:AEOURF>2.0.ZU;2-A
Abstract
A study of showers arriving from the direction of the gamma-ray source Geminga (1E0630+178) has shown evidence for emission of ultrahigh ene rgy radiation during the one week interval October 10-16, 1986. 83 sho wers were observed in the source bin as against an expected background of 44.1. The probability of observing this excess based on Monte Carl o simulations is less than 10(-4). The flux observed during this perio d (1.00+/-0.24) X 10(-11) cm-2 s-1 at energies greater-than-or-equal-t o 10(14) eV corresponds to a time-averaged luminosity of 6 X 10(32) er g s-1.