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CRTS-II Detection of Increased Optical Activity from CTA 102

ATel #11081; S. G. Djorgovski, A. J. Drake, A. A. Mahabal, M. J. Graham (Caltech); E. Christensen, S. M. Larson (LPL/UA)
on 21 Dec 2017; 18:53 UT
Credential Certification: Andrew J. Drake (ajd@cacr.caltech.edu)

Subjects: Optical, AGN, Blazar

We report the detection of significant optical brightening of FSRQ CTA 102 by CRTS-II on 2017 Dec. 8.15 UT. At that time CTA 102 was seen to have risen approximately 1.4 mags (to V_CSS = 14.15) compared with previous observations taken on 2017 Nov. 23 UT. Additional survey observations taken on 2017 Dec. 15 UT show CTA 102 at V_CSS = 14.05. However, we caution that this CRTS-II photometry is preliminary.

The timing of the optical outburst correlates well with the recent detection of increased gamma-ray emission noted by Lucarelli et al. (2017, ATel#11045) based on AGILE data. A similar increase has also been observed in the most recent Fermi LAT monitored source lightcurve.

The CRTS-II lightcurve and detection parameters for the brightening of CTA 102 are available here.

All transients detected by CRTS-II are public available through the CRTS project page.