@article{dcffc15412494c7398682d6996f70c82,
title = "Gamma-ray variability of the BL lacertae object Markarian 421",
abstract = "We report on the γ-ray variability of Mrk 421 at Eγ > 300 GeV during the 1995 season, and concentrate on the results of an intense multiwavelength observing campaign in the period April 20 to May 5, which included >100 MeV γ-ray, X-ray, extreme-ultraviolet, optical, and radio observations, some of which show evidence for correlated behavior. Rapid variations in the TeV γ-ray light curve with doubling and decay times of ≲1 day require a compact emission region and significant Doppler boosting. The TeV data reveal that the γ-ray emission is best characterized by a succession of rapid flares with a relatively low baseline level of steady emission.",
keywords = "BL Lacertae objects: individual (Markarian 421), Gamma rays: observations",
author = "Buckley, {J. H.} and Akerlof, {C. W.} and S. Biller and Carter-Lewis, {D. A.} and M. Catanese and Cawley, {M. F.} and V. Connaughton and Fegan, {D. J.} and Finley, {J. P.} and J. Gaidos and Hillas, {A. M.} and Kartje, {J. F.} and A. K{\"o}nigl and F. Krennrich and Lamb, {R. C.} and R. Lessard and Macomb, {D. J.} and Mattox, {J. R.} and McEnery, {J. E.} and G. Mohanty and J. Quinn and Rodgers, {A. J.} and Rose, {H. J.} and Schubnel, {M. S.} and Sembroski, {G. L.} and Smith, {P. S.} and Weekes, {T. C.} and C. Wilson and J. Zweerink",
note = "Funding Information: We wish to thank M. F. Aller and H. D. Aller for making their radio observations available, and S. Wagner and P. Coppi for useful discussions. This research is supported by grants from the US Department of Energy and by NASA, by PPARC in the UK, and by Forbairt in Ireland.",
year = "1996",
doi = "10.1086/310352",
language = "English (US)",
volume = "472",
pages = "L9--L12",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "American Astronomical Society",
number = "1 PART II",
}