X-ray/UV/Optical follow-up of the blazar PKS 2155-304 after the giant TeV flares of July 2006

Details X-ray/UV/Optical follow-up of the blazar PKS 2155-304 after the giant TeV flares of July 2006 X-ray/UV/Optical follow-up of the blazar PKS 2155-304 after the giant TeV flares of July 2006

2007-01-30

arxiv.org/abs/astro-ph/0701868v1

Astronomy and Astrophysics

Astrophysics

13 pages, 3 figures. ApJ Letters, accepted for publication

Scientific paper

10.1086/513271

We present all the publicly available data, from optical/UV wavelengths (UVOT) to X-rays (XRT, BAT), obtained from Swift observations of the blazar PKS 2155-304, performed in response to the rapid alert sent out after the strong TeV activity (up to 17 Crab flux level at E > 200 GeV) at the end of July 2006. The X-ray flux increased by a factor of 5 in the 0.3-10 keV energy band and by a factor of 1.5 at optical/UV wavelengths, with roughly one day of delay. The comparison of the spectral energy distribution built with data quasi-simultaneous to the TeV detections shows an increase of the overall normalization with respect to archival data, but only a small shift of the frequency of the synchrotron peak that remains consistent with the values reported in past observations when the TeV activity was much weaker.

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