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Elevated radio fluxes in flaring FSRQ PKS 0502+049

ATel #4868; Philip G. Edwards (CSIRO Astronomy and Space Science), Jamie Stevens (CSIRO Astronomy and Space Science), and Roopesh Ojha (NASA/GSFC)
on 7 Mar 2013; 01:13 UT
Credential Certification: Roopesh Ojha (Roopesh.Ojha@gmail.com)

Subjects: Radio, AGN, Blazar, Quasar

Referred to by ATel #: 4870, 7279

Following the Fermi LAT detection of a gamma-ray flare from the flat spectrum radio quasar PKS 0502+049 (ATel#4858), the Australia Telescope Compact Array (ATCA) was used to make "snapshot" observations at two radio frequencies: 5.5 and 9.0 GHz on 6 March 2013. Data at both frequencies was collected for about 5 minutes at 14:50 UTC, and calibrated against the ATCA primary flux calibrator PKS 1934-638.

The flux densities are: 1.1 Jy at 5.5 GHz and 1.2 Jy at 9 GHz where each flux density has a one-sigma uncertainty of +- 0.1 Jy (this uncertainty is a combination of systematic and statistical error and is dominated by the former). Each frequency is the centre of a 2 GHz wide band. Comparison with regular calibrator monitoring data indicates the flux density of PKS 0502+049 is currently 29% higher at 5.5 GHz than on 29 August 2011 and 58% higher at 9.0 GHz than on 29 August 2011.

Further monitoring will be continued and possible future activity will be reported using this and other platforms.