Observations of a Correlated Gamma-Ray and Optical Flare for BL Lacertae

Preprint

26 September 1997

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.astro-ph/9709264

Abstract

The latest observations of BL Lacertae with the EGRET instrument on CGRO show that the gamma-ray flux was four times higher than the previous detection. Within the 1997 July 15-22 observation there was a dramatic factor of 2.5 increase in the gamma-ray flux, with a sharp peak of about 8 hours, and apparently preceding a brief optical flare by several hours. The gamma-ray photon spectral index was significantly harder than that for the previous detection.

Keywords

PREVIOUS DETECTION
CORRELATED GAMMA
OPTICAL FLARE
BL LACERTAE
GAMMA RAY
LACERTAE
RAY FLUX

All Related Versions

Version 1, 1997-09-26, ArXiv
Published version: The Astrophysical Journal, 490 (2), L145.

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