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

S. D. Bloom | Zendy; D. L. Bertsch | Zendy; R. C. Hartman | Zendy; P. Sreekumar | Zendy; D. J. Thompson | Zendy; T. J. Balonek | Zendy; Eli Beckerman | Zendy; Scott Davis | Zendy; Kathryn Whitman | Zendy; H. R. Miller | Zendy; A. D. Nair | Zendy; Lewis C. Roberts | Zendy; G. Tosti | Zendy; E. Massaro | Zendy; R. Nesci | Zendy; M. Maesano | Zendy; F. Montagni | Zendy; Miran Jang | Zendy; H. Bock | Zendy; M. Dietrich | Zendy; M. Herter | Zendy; K. Otterbein | Zendy; Masahiro Yoshita | Zendy; T. Seitz | Zendy; S. Wagner | Zendy

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

Author(s) -

S. D. Bloom,

D. L. Bertsch,

R. C. Hartman,

P. Sreekumar,

D. J. Thompson,

T. J. Balonek,

Eli Beckerman,

Scott Davis,

Kathryn Whitman,

H. R. Miller,

A. D. Nair,

Lewis C. Roberts,

G. Tosti,

E. Massaro,

R. Nesci,

M. Maesano,

F. Montagni,

Miran Jang,

H. Bock,

M. Dietrich,

M. Herter,

K. Otterbein,

Masahiro Yoshita,

T. Seitz,

S. Wagner

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/311035

Subject(s) - physics , flare , astrophysics , egret , flux (metallurgy) , gamma ray , observatory , blazar , photon , spectral index , astronomy , spectral line , optics , chemistry , organic chemistry

The latest observations of BL Lacertae with the EGRET instrument on CGRO showthat 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 2.5increase in the gamma-ray flux, with a sharp peak of about 8 hours, andapparently preceding a brief optical flare by several hours. The gamma-rayphoton spectral index was significantly harder than that for the previousdetection.Comment: 11 pages, 3 figures. To be published in the Astrophysical Journal Letter

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