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SAO RAS Observations of current brightening of [HB89] 0716+714 blazar

ATel #11725; O. I. Spiridonova, V. V. Vlasyuk, A. S. Moskvitin (SAO RAS)
on 16 Jun 2018; 21:56 UT
Credential Certification: Alexander Moskvitin (mosk@sao.ru)

Subjects: Optical, Blazar

Referred to by ATel #: 12298, 16980

As it was noted by some observers, the blazar [HB89] 0716+714 is undergoing new brightening phase since end of 2017 (see ATel #11107,#11339,#11676) after report of MAGIC collaboration about its strong activity in VHE (E>100 GeV) gamma rays. We performed a multicolor broad-band photometry of the selected blazars, using by the 1-meter reflector Zeiss-1000 of the Special Astrophysical Observatory of RAS (Northern Caucasus, Russia), equipped with UBVRI filters and CCD camera based on 2k x 2k EEV 42-40 chip. Our last measurements showed that blazar brightness became in some last days even higher than it was reported (ATel #11676). The results of our observations in R-band are summarized in the following table:

Civil Date MJD Rmag +/- dRmag
2018.05.15 58254.30 12.42 +/- 0.01
2018.06.13 58283.34 12.01 +/- 0.02
2018.06.14 58284.31 12.00 +/- 0.02
2018.06.15 58285.41 12.07 +/- 0.04
2018.06.16 58286.39 11.98 +/- 0.02

So current brightness of the blazar [HB89] 0716+714 within last 4 days is near it's absolute maximum value in this century as it was detected by us in January of 2015 (ATel #6953). We shall continue studies the source in the following nights. Also multi-wavelength follow-up is warmly encouraged.