Prompt optical observations of GRB 080330 and GRB 080413A (2008)
Yuan, F., Rykoff, E. S., Schaefer, B. E., Rujopakarn, W., Güver, T., Aharonian, F., ...
We report on the results of rapid responses to GRB 080330 and GRB 080413A by the ROTSE-IIIb and ROTSE-IIIc telecopes. In both cases, optical follow-up started during the prompt emission phase and...
Exploring a SNR/molecular cloud association within HESS J1745-303 (2008)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
Discovery of VHE gamma-rays from the high-frequency-peaked BL lacertae object RGB J0152+017 (2008)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
HESS upper limits for Kepler's supernova remnant (2008)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
HESS observations and VLT spectroscopy of PG 1553+113 (2008)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
Upper limits from HESS active galactic nuclei observations in 2005-2007 (2008)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
HESS very-high-energy gamma-ray sources without identified counterparts (2008)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
Chandra and HESS observations of the supernova remnant CTB 37B (2008)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
Exploring broadband GRB behavior during gamma-ray emission (2007)
Yost, S. A., Swan, H. F., Rykoff, E. S., Aharonian, F., Akerlof, C. W., Alday, A., ...
Nucleonic gamma-ray production in pulsar wind nebulae (2007)
Horns, D., Aharonian, F., Hoffmann, A. I. D., Santangelo, A.
The dark side of ROTSE-III prompt GRB observations (2007)
Yost, S. A., Aharonian, F., Akerlof, C. W., Ashley, M. C. B., Barthelmy, S., Gehrels, N., ...
Discovery of VHE gamma-rays from the distant BL Lacertae 1ES0347-121 (2007)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
New constraints on the mid-IR EBL from the HESS discovery of VHE gamma-rays from 1ES 0229+200 (2007)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
Discovery of two candidate pulsar wind nebulae in very-high-energy gamma rays (2007)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Behera, B., Beilicke, M., Benbow, W., ...
An exceptional very high energy gamma-ray flare of PKS 2155-304 (2007)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Behera, B., Beilicke, M., Benbow, W., ...
Search for pulsed VHE gamma-ray emission from young pulsars with HESS (2007)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
First ground-based measurement of atmospheric Cherenkov light from cosmic rays (2007)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
The H.E.S.S. survey of the Inner Galaxy in very-high-energy gamma-rays (2006)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
We report on a survey of the inner part of the Galactic Plane in very high energy gamma-rays, with the H.E.S.S. Cherenkov telescope system. The Galactic Plane between +-30deg in longitude and +-3deg...
Discovery of very-high-energy gamma-rays from the Galactic Centre ridge (2006)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
The source of Galactic cosmic rays (with energies up to 1015 eV) remains unclear, although it is widely believed that they originate in the shock waves of expanding supernova remnants1, 2. At present...
Evidence for VHE gamma-ray emission from the distant BL Lac PG 1553+113 (2006)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
The high-frequency peaked BL Lac PG 1553+113 was observed in 2005 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. Using the HESS standard analysis, an excess...
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
The Vela supernova remnant (SNR) is a complex region containing a number of sources of non-thermal radiation. The inner section of this SNR, within 2 degrees of the pulsar PSR B0833-45, has been...
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
We present results from deep observations of the Galactic shell-type supernova remnant (SNR) RX J1713.7-3946 (also known as G347.3-0.5 ) conducted with the complete HESS array in 2004....
A low level of extragalactic background light as revealed by gamma-rays from blazars (2006)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
The diffuse extragalactic background light consists of the sum of the starlight emitted by galaxies through the history of the Universe, and it could also have an important contribution from the...
Discovery of the two wings of the Kookaburra complex in VHE gamma-rays with H.E.S.S (2006)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
Aims. Search for Very High Energy gamma-ray emission in the Kookaburra complex through observations with the H.E.S.S. array. Methods. Stereoscopic imaging of Cherenkov light emission of the gamma-ray...
The Anomalous Early Afterglow of GRB 050801 (2006)
Rykoff, E.S., Aharonian, F., Akerlof, C. W., Mangano, V., Ashley, M. C. B., Güver, T., ...
The ROTSE-IIIc telescope at the HESS site, Namibia, obtained the earliest detection of optical emission from a gamma-ray burst (GRB), beginning only 21.8 s from the onset of Swift GRB 050801. The...
Early-Time Observations of the GRB 050319 Optical Transient (2006)
Rykoff, E.S., Aharonian, F., Akerlof, C. W., Alatalo, K., Ashley, M. C. B., Güver, T., ...
We present the unfiltered ROTSE-III light curve of the optical transient associated with GRB 050319 beginning 4 s after the cessation of gamma-ray activity. We fit a power-law function to the data...
Kelner, S. R., Aharonian, F., Bugayov, V. V.
We present new parametrisations of energy spectra of secondary particles, $\pi$-mesons, gamma-rays, electrons and neutrinos, produced in inelastic proton-proton collisions. The simple analytical...
Stawarz, L., Aharonian, F., Wagner, S., Ostrowski, M.
Several BL Lac objects are confirmed sources of variable and strongly Doppler-boosted TeV emission produced in the nuclear portions of their relativistic jets. It is more than probable, that also...
On the origin of the TeV lightcurve of PSR B1259-63/SS2883 (2006)
Khangulyan, D., Hnatic, S., Aharonian, F., Bogovalov, S.
The inverse Compton (IC) scattering of electrons accelerated at the pulsar wind termination shock is believed to be responsible for TeV gamma-ray signal recently reported from the binary system PSR...
Observations of 14 young open star clusters with the HEGRA system of Cherenkov telescopes (2006)
Aharonian, F., Akhperjanian, A., Beilicke, M., Bernlöhr, K., Bojahr, H., ...
A New Population of Very High Energy Gamma-Ray Sources in the Milky Way (2005)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
Very high energy -rays probe the long-standing mystery of the origin of cosmic rays. Produced in the interactions of accelerated particles in astrophysical objects, they can be used to image cosmic...
H.E.S.S. Observations of PKS 2155-304 (2005)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
The high-frequency peaked BL Lac PKS 2155-304 at redshift z=0.117 has been detected with high significance (~45 ) at energies greater than 160 GeV, using the H.E.S.S. stereoscopic array of imaging...
Search for TeV emission from the region around PSR B1706-44 with the H.E.S.S. experiment (2005)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
The region around PSR B1706-44 has been observed with the HESS imaging atmospheric Cherenkov telescopes in 2003. No evidence for gamma-ray emission in the TeV range was found at the pulsar position...
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
The Supernova Remnant MSH 15-52 has been observed in very high energy (VHE) gamma-rays using the HESS 4-telescope array located in Namibia. A gamma-ray signal is detected at the 25 sigma level during...
Aharonian, F., Akhperjanian, A. G., Borrel, V., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
We report the detection of TeV -rays from the shell-type supernova remnant RX J0852.0-4622 with data of 3.2 h of live time recorded with HESS in February 2004. An excess of (700 ± 60) events from...
Observations of Mkn 421 in 2004 with HESS at large zenith angles (2005)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
Mkn 421 was observed during a high flux state for nine nights in April and May 2004 with the fully operational High Energy Stereoscopic System (HESS) in Namibia. The observations were carried out at...
Upper limits to the SN1006 multi-TeV gamma-ray flux from H.E.S.S. observations (2005)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
Observations of the shell-type supernova remnant SN1006 have been carried out with the HESS system of Cherenkov telescopes during 2003 (18.2 h with two operating telescopes) and 2004 (6.3 h with all...
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
We report the discovery of very-high-energy (VHE) gamma-ray emission of the binary system PSR B1259-63/SS 2883 of a radio pulsar orbiting a massive, luminous Be star in a highly eccentric orbit. The...
Discovery of Very High Energy Gamma Rays Associated with an X-ray Binary (2005)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
X-ray binaries are composed of a normal star in orbit around a neutron star or stellar-mass black hole. Radio and x-ray observations have led to the presumption that some x-ray binaries called...
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
We report on a possible association of the recently discovered very high-energy gamma-ray source HESS J1825--137 with the pulsar wind nebula (commonly referred to as G 18.0--0.7) of the 2.1 x 104...
A Search for Untriggered GRB Afterglows with ROTSE-III (2005)
Rykoff, E.S., Aharonian, F., Akerlof, C. W., Alatalo, K., Ashley, M. C. B., Güver, T., ...
We present the results of a search for untriggered gamma-ray burst (GRB) afterglows with the Robotic Optical Transient Search Experiment-III (ROTSE-III) telescope array. This search covers...
Prompt Optical Detection of GRB 050401 with ROTSE-IIIa (2005)
Rykoff, E.S., Aharonian, F., Akerlof, C. W., Alatalo, K., Ashley, M. C. B., Güver, T., ...
The ROTSE-IIIa telescope at Siding Spring Observatory, Australia, detected prompt optical emission from Swift GRB 050401. We present observations of the early optical afterglow, first detected by the...
Optical Light Curve and Cooling Break of GRB 050502A (2005)
Rykoff, E.S., Aharonian, F., Akerlof, C. W., Alatalo, K., Ashley, M. C. B., Güver, T., ...
We present light curves of the afterglow of GRB 050502A, including very early data at t - tGRB < 60 s. The light curve is composed of unfiltered ROTSE-IIIb optical observations from 44 s to 6 hr...
Fontaine, G., Aharonian, F., Benbow, W., Boisson, C., Costamante, L., ...
The high-frequency peaked BL Lac PKS 2155-304, at a redshift z = 0.117, has been detected with high significance at energies greater than 160 GeV, using the H.E.S.S. stereoscopic array of imaging...
Rowell, Gavin Peter, Aharonian, F., Plyasheshnikov, A.
The origin of Galactic CRs up the knee energy remains unanswered and provides strong motivation for the study of gamma-ray sources at energies above 10 TeV. We discuss recent results from...
Rowell, Gavin Peter, Aharonian, F., Plyasheshnikov, A.
The origin of Galactic CRs up the knee energy remains unanswered and provides strong motivation for the study of gamma-ray sources at energies above 10 TeV. We discuss recent results from...
Observations of 54 Active Galactic Nuclei with the HEGRA System of Cherenkov Telescopes (2004)
The HEGRA Collaboration, Aharonian, F., Akhperjanian, A., Beilicke, M.
A sample of 54 selected Active Galactic Nuclei (AGN) has been observed with the HEGRA stereoscopic system of Cherenkov Telescopes between 1996 and 2002 in the TeV energy regime. The observations were...
The Crab supernova remnant has been observed regularly with the stereoscopic system of 5 imaging air Cherenkov telescopes that was part of the High Energy Gamma Ray Astronomy (HEGRA) experiment. In...
Search for very high energy γ-ray emission from the starburst galaxy NGC 253 with H.E.S.S.
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
We present the result of observations of the nearby starburst galaxy NGC 253 with the H.E.S.S. detector in 2003. We find no evidence for very high gamma-ray emission from this object. Gamma-ray...
Serendipitous discovery of the unidentified extended TeV gamma-ray source HESS J1303-631
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
The serendipitous discovery of an unidentified extended TeV gamma-ray source close to the galactic plane named HESS J1303-631 at a significance of 21 standard deviations is reported. The observations...