Successful observations of the seven predicted bremsstrahlung flares from the unique bright
blazar OJ 287 firmly point to the presence of a nanohertz gravitational wave (GW) emitting …

In its nearly regular cycle of outbursts the quasar OJ 287 is due for another outburst season
in 2006-2010. The prediction for the exact timing depends on the adopted model. In the …

We detected a possible quasi-periodic oscillation (QPO) of∼ 71 d in the 0.1–300 GeV γ-ray
Fermi-Large Area Telescope light curve of the high-redshift flat spectrum radio quasar B2 …

Two multifrequency campaigns were carried out on OJ287 in 2005: in April when it was in its
pre-outburst state, and in November during the main 12 yr cycle outburst. The wavelength …

Here we report our recent discoveries of Quasi-Periodic Oscillations (QPOs) in blazars time
series data in X-ray and optical electromagnetic bands. Any such detection can give …

We report the time series analysis of Transiting Exoplanet Survey Satellite light curves of
three blazars, BL Lacertae (BL Lac), 1RXS J111741. 0+ 254858, and 1RXS J004519. 6+ …

We report the detection of a probable γ-ray quasi-periodic oscillation (QPO) of around 314 d
in the monthly binned 0.1–300 GeV γ-ray Fermi-Large Area Telescope light curve of the well …

Historically, 3C 66A has been considered a relative quiescent blazar. For that reason, 3C
66A was selected as a comparison source for OJ 287 in the OJ-94 project. However, after …

We revisit the precessing black hole binary model, a candidate to explain the bizarre quasi-
periodic optical flares in OJ-287's light curve, from first principles. We deviate from existing …

We have performed a structure function analysis of the Rossi X-Ray Timing Explorer All-Sky
Monitor data to search for variability in 24 blazars using data trains that each exceed 12 yr …