@conference {28439,
	title = {Continuous optical monitoring of the highly active blazar Mrk421},
	year = {2013},
	month = {2013/09/1},
	pages = {30 - 30},
	abstract = {We present the recent photometric monitoring of blazar Mrk421, obtained from the Gerostathopouleio Observatoty at University of Athens. Follow-up observations have been performed on this source after a highly energetic flare which occurred on 13 April, 2013. The flare was observed in X- rays by Nustar \& Swift and in GeV - TeV gamma-rays by the Fermi satellite and MAGIC/VERITAS telescopes respectively. Continuous photometric monitoring in the optical BVRI bands during 3 months after the flaring activity reveals a quasi-periodic light variation. This is one of the few times that Mrk 421 was observed for such a long period without large observational gaps. We perform Fourier analysis of the almost uninterrupted 3-months-long dataset in order to get insight on the characteristic timescales of the system. We discuss also possible origins of the optical variability by performing cross-correlation analysis of the optical and of the simultaneous X-ray emission detected with XRT onboard the SWIFT orbital satellite.},
	url = {https://ui.adsabs.harvard.edu/abs/2013hell.conf...30G},
	author = {Gazeas, K. and Petropoulou, M. and Mastichiadis, A.}
}
