The BL Lac type object AP Lib - also a Fermi source - is detected at VHE energies in ~8h of observations with H.E.S.S. in June and July 2010, with a flux around 2% of the Crab flux. Wide-band spectra of AL Lib indicate an unusually broad high energy component stretching from X-rays to VHE gamma rays. See Astronomer's Telegram Atel #2743.

SN 1006, an object long predicted as a source of cosmic rays and of VHE gamma rays and with quite a bit of history as far as VHE gamma-ray astronomy is concerned, was finally detected in a long exposure accumulating over 100 h of data, at a flux of about 1% of that of the Crab Nebula. The morphology of gamma-ray emission follows the morphology seen in hard X-rays, which the polar caps of the remnant as two distinct source regions. The paper is in published in A&A 516 (2010) A62 and can be found on the preprint server: arXiv:1004.2124.

PKS 0548-322 is a nearby (z=0.069) and bright BL Lac object hosted by a giant elliptical galaxy. It was suggested as an emitter of very high energy gamma rays on the basis of its high X-ray and radio flux. Based on 35 h of good data accumulated between October 2004 and January 2008, H.E.S.S. detects gamma rays from PKS 0548-322 at more than 5 sigma significance; the flux is only about 1% of the flux of the Crab Nebula. The paper is in press in A&A and can be found on the preprint server: arXiv:1006.5289.

VHE gamma-ray observations of the BL Lac object PKS 2155-304 are summarized, based on data collected in 2005-2007, covering a wide range of flux states. Gamma-ray spectra and flux variability are investigated on time scales ranging from a few minutes to several years. The source exhibits a well defined low state, with a set of exceptional flares in July 2006. The variability pattern points towards a multiplicative process as source of the flares, resulting in a lognormal distribution of flare amplitudes. The paper is in press in A&A and can be found on the preprint server: arXiv:1005.3702.

The BL Lac object H2356-309 was observed with H.E.S.S. from 2004 through 2007, with additional monitoring in X-rays, optical and radio wavebands during selected periods. The gamma ray emission is variable on scales of months and years. The - compared to archival data - low X-ray flux indicates that significantly higher gamma ray flux might be expected during future flares of the source. The paper is in press in A&A and can be found on the preprint server: arXiv:1004.2089.

The source 0FGL J0449.7-4348, one of the brightest extragalactic sources from the Fermi bright source list, has been associated with PKS 0447-439, a BL Lac object located at a redshift of z ~ 0.2. VHE emission from this source has been detected in 12 h of observations recorded with the H.E.S.S. telescope array between November 10 and December 16, 2009. The significance of the signal - derived from a preliminary on-site analysis - exceeds 5 standard deviations. See Astronomer's Telegram 2350.

Using improved procedures to control and correct H.E.S.S. instrument pointing, the systematic error in the determination of source positions is reduced to 6" per axis, a three-fold improvement over previous HESS measurements. Using these techniques, the position of the Galactic Center gamma-ray source HESS J1745-290 is determined with a total 13" error radius. The measured position is within errors coincident with the position of the supermassive black hole Sgr A*, but is significantly displaced from the centroid of the supernova remnant Sgr A East, excluding this object with high probability as the dominant source of the VHE gamma-ray emission. The paper is in press in MNRAS and can be found on the preprint server: arXiv:0911.1912.

The AGN PKS 2005-489 was observed with H.E.S.S. from 2004 through 2007, together with three simultaneous multi-wavelength campaigns performed with XMM-Newton and RXTE in 2004 and 2005. The gamma-ray flux varies weakly on time-scales from days to years. At X-ray energies the flux is observed to vary by more than an order of magnitude between 2004 and 2005. The large flux variations in the X-ray band, coupled with weak or no variations in the VHE band and a similar spectral behavior, suggest the emergence of a new, separate, harder emission component in September 2005. The paper is in press in A&A and can be found on the preprint server: arXiv:0911.2709.

Gamma ray emission from the binary pulsar PSR B1259-63 was first discovered by H.E.S.S. in 2005. In 2007, the pulsar had another periastron passage on its 3.4 year orbit. While the pulsar was invisible in gamma rays on other sections of its orbit, it was again detected about 50 days before its 2007 periastron. A detection at this location along the orbit disfavors scenarios where gamma ray emission is caused by interaction with the companion star's disk-like outflow, if current assumptions concerning shape and inclinination of the stellar disk are correct. The paper appeared in A&A 507 (2009) 389-396.

Starburst galaxies exhibit in their central regions a highly increased rate of supernovae, which are expected to generate a high density of cosmic rays accelerated in the supernova shocks. The detection of gamma rays from the starburst galaxy NGC 253 in deep H.E.S.S. observations indeed indicates a cosmic ray density about three orders of magnitude larger than in the center of the Milky Way. With a flux of 0.3% of the Crab Nebula flux, NGC 253 is the faintest very high energy gamma ray source detected so far. The paper appeared in Science Express, Sept. 24, 2009 and on the preprint server: arXiv:0909.4651. See also MPG press release.

Galaxy clusters act as storehouses for cosmic rays, escape times from a cluster typically being larger than the age of the Universe. Upper limits on the very high energy gamma rays flux determined with H.E.S.S. constrain the content of high energy particles in the Coma cluster; depending on the detailed assumptions, limits are as low as 20% of the thermal energy content of the cluster, ruling out the most optimistic models for gamma-ray emission from clusters. The paper is in press in A&A and can be found on the preprint server: arXiv:0907.0727.

The three leading teams in the field of very-high-energy gamma-ray astrophysics, H.E.S.S., MAGIC, and VERITAS, joined up with a team of radio astronomers to, for the first time, reveal the precise location of particle acceleration in the close-by giant radio galaxy Messier 87. Simultaneous observations at the lowest and highest ends of the electromagnetic spectrum indicate that this active galactic nucleus accelerates elementary particles to very high energies in the immediate vicinity of its central black hole. The paper has been published in Science Express. See also H.E.S.S. press release in English, German, French, MPG press release, NRAO press release, MAGIC press release, VERITAS press release.