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Abstract: We selected a sample of a dozen blazars which are the prime candidates forsimultaneous multi-wavelength observing campaigns in their outburst phase. Wesearched for optical outbursts, intra-day variability and short termvariability in these blazars. We carried out optical photometric monitoring ofnine of these blazars in 13 observing nights during our observing run October27, 2006 - March 20, 2007 by using the 1.02 meter optical telescope. From ourobservations, our data favor the hypothesis that three blazars were in theoutburst state; one blazar was in the post outburst state; three blazars werein the pre-post outburst state; one blazar was in the low-state; and the stateof one blazar was not known because there is not much optical data availablefor the blazar to compare with our observations. Out of three nights ofobservations of AO 0235+164, intra-day variability was detected in two nights.Out of five nights of observations of S5 0716+714, intra-day variability wasdetected in two nights. In one night of observations of PKS 0735+178, intra-dayvariability was detected. Out of six nights of observations of 3C 454.3,intra-day variability was detected in three nights. No intra-day variabilitywas detected in S2 0109+224, OJ 287, ON 231, 3C 279 and 1ES 2344+514 in their1, 4, 1, 2 and 1 nights of observations respectively. AO 0235+164, S5 0716+714,OJ 287, 3C 279 and 3C 454.3 were observed in more than one night and short termvariations in all these blazars were also noticed. From our observations andthe available data, we found that the predicted optical outburst with the timeinterval of ~ 8 years in AO 0235+164 and ~ 3 years in S5 0716+714 have possiblyoccurred.

Autor: A. C. Gupta 1, J. H. Fan 2, J. M. Bai 1, S. J. Wagner 3 1 National Astronomical Observatories - Yunnan Observatory, CAS, Kunming,

Fuente: https://arxiv.org/

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