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Title:
Discovery of a Nonblazar Gamma-Ray Transient Source near the Galactic Plane: GRO J1838-04
Authors:
Tavani, M.; Mukherjee, R.; Mattox, J. R.; Halpern, J.; Thompson, D. J.; Kanbach, G.; Hermsen, W.; Zhang, S. N.; Foster, R. S.
Publication:
Astrophysical Journal Letters v.479, p.L109 (ApJ Homepage)
Publication Date:
04/1997
Origin:
APJ
ApJ Keywords:
GAMMA RAYS: OBSERVATIONS, GALAXIES: ACTIVE, STARS: NEUTRON
DOI:
10.1086/310603
Bibliographic Code:
1997ApJ...479L.109T

Abstract

We report the discovery of a remarkable gamma -ray transient source near the Galactic plane, GRO J1838-04. This source was serendipitously discovered by EGRET in 1995 June with a peak intensity of ~(4 +/- 1) x 10-6 photons cm-2 s-1 (for photon energies larger than 100 MeV) and a 5.9 sigma significance. At that time, GRO J1838-04 was the second brightest gamma -ray source in the sky. A subsequent EGRET pointing in 1995 late September detected the source at a flux smaller than its peak value by a factor of ~7. We determine that no radio-loud spectrally flat blazar is within the error box of GRO J1838-04. We discuss the origin of the gamma -ray transient source and show that interpretations in terms of active galactic nuclei or isolated pulsars are highly problematic. GRO J1838-04 provides strong evidence for the existence of a new class of variable gamma -ray sources.
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