MAGIC TeV Gamma-Ray Observations of Markarian 421 during Multiwavelength Campaigns in 2006
MAGIC Collaboration: J. Aleksi\'c (1), L. A. Antonelli (2), P., Antoranz (3), M. Backes (4), C. Baixeras (5), S. Balestra (3), J. A. Barrio, (3), D. Bastieri (6), J. Becerra Gonz\'alez (7), W. Bednarek (8), A., Berdyugin (9), K. Berger (9), E. Bernardini (10), A. Biland (11)

TL;DR
This paper reports on MAGIC telescope observations of Mkn 421 during 2006, revealing rapid variability, spectral characteristics, and flux correlations that support leptonic acceleration models in blazar jets.
Contribution
First detailed multi-night gamma-ray variability and spectral analysis of Mkn 421 during 2006 multiwavelength campaigns.
Findings
Detected strong gamma-ray signals on all nights
Observed intra-night variability with a doubling time of ~36 minutes
Found spectral peak energy rising with increasing flux
Abstract
The Major Atmospheric Gamma Imaging Cerenkov (MAGIC) telescope participated in three multiwavelength (MWL) campaigns, observing the blazar Markarian (Mkn) 421 during the nights of 2006 April 28, 29, and 2006 June 14. We analyzed the corresponding MAGIC very-high energy observations during 9 nights from 2006 April 22 to 30 and on 2006 June 14. We inferred light curves with sub-day resolution and night-by-night energy spectra. A strong gamma-ray signal was detected from Mkn 421 on all observation nights. The flux (E > 250 GeV) varied on night-by-night basis between (0.92+-0.11)10^-10 cm^-2 s^-1 (0.57 Crab units) and (3.21+-0.15)10^-10 cm^-2 s^-1 (2.0 Crab units) in 2006 April. There is a clear indication for intra-night variability with a doubling time of 36+-10(stat) minutes on the night of 2006 April 29, establishing once more rapid flux variability for this object. For all individual…
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