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We report results of a multiband monitoring campaign of the flat spectrumradio quasar TXS 0536+145 at redshift 2.69. This source was detected during avery high gamma-ray activity state in 2012 March by the Large Area Telescope onboard Fermi, becoming the gamma-ray flaring blazar at the highest redshiftdetected so far. At the peak of the flare the source reached an apparentisotropic gamma-ray luminosity of 6.6 x 10^49 erg/s which is comparable to thevalues achieved by the most luminous blazars. This activity triggeredradio-to-X-rays monitoring observations by Swift, Very Long Baseline Array,European VLBI Network, and Medicina single-dish telescope. Significantvariability was observed from radio to X-rays supporting the identification ofthe gamma-ray source with TXS 0536+145. Both the radio and gamma-ray lightcurves show a similar behaviour, with the gamma-rays leading the radiovariability with a time lag of about 4-6 months. The luminosity increase isassociated with a flattening of the radio spectrum. No new superluminalcomponent associated with the flare was detected in high resolutionparsec-scale radio images. During the flare the gamma-ray spectrum seems todeviate from a power law, showing a curvature that was not present during theaverage activity state. The gamma-ray properties of TXS 0536+145 are consistentwith those shown by the high-redshift gamma-ray blazar population.

Exploring the multiband emission of TXS 0536+145: the most distant gamma-ray flaring blazar