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An optically flaring Blazar from the CRTS Survey

ATEL # 2051; A.A. Mahabal, S.G. Djorgovski, A.J. Drake, M. Graham, R. Williams (Caltech), E. Beshore, S.M. Larson, A. Boattini, A. Gibbs, R. Hill, R. Kowalski (UA/LPL), E. Christiansen (Gemini Obs.)
on 20 May 2009; 2:21 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: Ashish Mahabal (

Subjects: Radio, Optical, Request for Observations, Variables

We have detected the optical flaring of a radio source with unknown redshift in the data from the Catalina Real-time Transient Survey (CRTS). The discovery J2000 coordinates are as follows.

ID Detection DateRADecMagVOEvent ID
CSS090517:130303+24356 2009-05-13 UT 06:40:24 13:03:03.2024:33:56.1 16.7 905171230654131642
The mag column above refers to the visual outburst mag from the CSS. It has brightened by over 3 mags in the last 3 months. It would be interesting to see if the outburst is also seen at other wavelengths, especially in gamma-rays

The discovery data, CSS lightcurve and finding chart for the source are posted at the following VOEventNet webpage:

Further observations are requested.

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R. E. Rutledge , Editor
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