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CRTS detection of optical outburst of PKS 2023-07

ATEL # 2179; A.A. Mahabal, S.G. Djorgovski, A.J. Drake, M.J. Graham, R. Williams (Caltech); M. Catelan (PUC); E.C. Beshore, S.M. Larson (LPL/UA); E. Christensen (Gemini Observatory);
on 30 Aug 2009; 0:02 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: Ashish Mahabal (

Subjects: Optical, >GeV, Request for Observations, Transients

We report on the discovery of an optical outburst associated with PKS 2023-07 by the Catalina Real-Time Transient Survey (CRTS). Recently, Gasparrini et al. ATel#2175 noted the Fermi LAT detection of a GeV flare from blazar PKS 2023-07. On Aug 29.17 UT CRTS automatically detected and alerted that this object was undergoing a significant optical outburst with V~15.2.

ID Detection DateRADecMagVOEvent ID
CSS090829:202541-073553 2009-08-29 UT 04:15:36 20:25:40.63-07:35:52.7 15.2 908290071094126135

Past photometry dating back to April 2005 suggests that this blazar is highly variable often showing wild variations in brightness over relatively short periods, and is in that sense unlike most blazars. In particular the luminosity ranges from V~18.7 on July 11th 2009 to its current level. The lightcurve and further details can be found at . Further observations are requested.

Current candidate and confirmed Blazars detected by CRTS can be found here.
More details of the CRTS project are available at

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