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H.E.S.S. discovers VHE gamma-rays from the BL Lac RGB J0152+017

ATEL # 1295; Dalibor Nedbal (Prague University), Wystan Benbow (Max-Planck-Institut fuer Kernphysik, now at Harvard-Smithsonian Center for Astrophysics), Luigi Costamante (Max-Planck-Institut fuer Kernphysik, now at HEPL/KIPAC), Berrie Giebels (Laboratoire Leprince Ringuet - IN2P3/CNRS), Sarah Kaufmann (Landessternwarte Heidelberg), Martin Raue (Max-Planck-Institut fuer Kernphysik), Ladislav Rob (Prague University), Stefan Wagner (Landessternwarte Heidelberg), on behalf of the H.E.S.S. (High Energy Stereoscopic System) collaboration
on 21 Nov 2007; 15:08 UT
Password Certification: Berrie Giebels (

Subjects: >GeV, AGN

We report on the H.E.S.S. discovery of VHE gamma-rays from the BL Lac object RGB J0152+017. H.E.S.S. observed the source from Oct 30 to Nov 14, 2007 for a total of ~14h live time. A preliminary on-site analysis resulted in a ~7 sigma detection of the source with an average flux level of ~2% Crab above 250 GeV. On the night Nov 12-13 the source showed indication for a higher flux state resulting in a ~5 sigma detection in less than 2h observation time. SWIFT and RXTE ToO observations yielded a detection with both instruments at the ~1 mCrab level (2-10 keV). Due to observing restrictions, the source could not be observed after Nov 13-14. We encourage other observatories to conduct follow up observations of the source to confirm a possible high VHE flux state and to collect a MWL data-sample of this newly detected VHE source.

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