Related papers: VERITAS Observations of the gamma-Ray Binary LS I …

Broad-Band High-Energy Emission of the Gamma-ray Binary System LS 5039: Spectral and Temporal Features using NuSTAR and Fermi Observations

We report on detailed analysis of the hard X-ray and GeV gamma-ray spectra of LS 5039, one of the brightest gamma-ray binary system in the Galaxy. The NuSTAR observation covering its entire orbit in 2016 allowed us for the first time to…

High Energy Astrophysical Phenomena · Physics 2021-10-20 Hiroki Yoneda , Dmitry Khangulyan , Teruaki Enoto , Kazuo Makishima , Kairi Mine , Tsunefumi Mizuno , Tadayuki Takahashi

Performance of the VERITAS experiment

VERITAS is a ground-based gamma-ray instrument operating at the Fred Lawrence Whipple Observatory in southern Arizona. With an array of four imaging atmospheric Cherenkov telescopes (IACTs), VERITAS is designed to measure gamma rays with…

Instrumentation and Methods for Astrophysics · Physics 2019-08-13 Nahee Park

VERITAS follow-up observation of the blazar TXS 0506+056

The gamma-ray blazar TXS 0506+056 was found with an enhanced gamma-ray emission state in spatial and temporal coincidence with the IceCube high energy neutrino event IC170922A. This is the most significant association by far between a…

High Energy Astrophysical Phenomena · Physics 2021-08-16 Weidong Jin , RileyAnne Sharpe

Discovery of VHE Gamma-Ray Emission from the Binary System LMC P3

Recently, the $\gamma$-ray emission at MeV and GeV energies from the object LMC P3 in the Large Magellanic Cloud has been discovered to be modulated with a 10.3-days period, making it the first extra-galactic $\gamma$-ray binary. This work…

High Energy Astrophysical Phenomena · Physics 2017-08-11 Nukri Komin , Maria Haupt , H. E. S. S. Collaboration

Discovery of variable VHE gamma-ray emission from the binary system 1FGL J1018.6-5856

Re-observations with the H.E.S.S. telescope array of the very-high-energy (VHE) source HESS J1018-589 A coincident with the Fermi-LAT $\gamma$-ray binary 1FGL J1018.6-5856 have resulted in a source detection significance of more than…

High Energy Astrophysical Phenomena · Physics 2016-08-08 H. E. S. S. Collaboration , : , A. Abramowski , F. Aharonian , F. Ait Benkhali , A. G. Akhperjanian , E. O. Angüner , M. Backes , A. Balzer , Y. Becherini , J. Becker Tjus , D. Berge , S. Bernhard , K. Bernlöhr , E. Birsin , R. Blackwell , M. Böttcher , C. Boisson , J. Bolmont , P. Bordas , J. Bregeon , F. Brun , P. Brun , M. Bryan , T. Bulik , J. Carr , S. Casanova , N. Chakraborty , R. Chalme-Calvet , R. C. G. Chaves , A. Chen , M. Chrétien , S. Colafrancesco , G. Cologna , J. Conrad , C. Couturier , Y. Cui , I. D. Davids , B. Degrange , C. Deil , P. deWilt , A. Djannati-Ataï , W. Domainko , A. Donath , L. O'C. Drury , G. Dubus , K. Dutson , J. Dyks , M. Dyrda , T. Edwards , K. Egberts , P. Eger , J. -P. Ernenwein , P. Espigat , C. Farnier , S. Fegan , F. Feinstein , M. V. Fernandes , D. Fernandez , A. Fiasson , G. Fontaine , A. Förster , M. Füßling , S. Gabici , M. Gajdus , Y. A. Gallant , T. Garrigoux , G. Giavitto , B. Giebels , J. F. Glicenstein , D. Gottschall , A. Goyal , M. -H. Grondin , M. Grudzińska , D. Hadasch , S. Häffner , J. Hahn , J. Hawkes , G. Heinzelmann , G. Henri , G. Hermann , O. Hervet , A. Hillert , J. A. Hinton , W. Hofmann , P. Hofverberg , C. Hoischen , M. Holler , D. Horns , A. Ivascenko , A. Jacholkowska , C. Jahn , M. Jamrozy , M. Janiak , F. Jankowsky , I. Jung-Richardt , M. A. Kastendieck , K. Katarzyński , U. Katz , D. Kerszberg , B. Khélifi , M. Kieffer , S. Klepser , D. Klochkov , W. Kluźniak , D. Kolitzus , Nu. Komin , K. Kosack , S. Krakau , F. Krayzel , P. P. Krüger , H. Laffon , G. Lamanna , J. Lau , J. Lefaucheur , V. Lefranc , A. Lemière , M. Lemoine-Goumard , J. -P. Lenain , T. Lohse , A. Lopatin , C. -C. Lu , R. Lui , V. Marandon , A. Marcowith , C. Mariaud , R. Marx , G. Maurin , N. Maxted , M. Mayer , P. J. Meintjes , U. Menzler , M. Meyer , A. M. W. Mitchell , R. Moderski , M. Mohamed , K. Morå , E. Moulin , T. Murach , M. de Naurois , J. Niemiec , L. Oakes , H. Odaka , S. Öttl , S. Ohm , E. de Oña Wilhelmi , B. Opitz , M. Ostrowski , I. Oya , M. Panter , R. D. Parsons , M. Paz Arribas , N. W. Pekeur , G. Pelletier , P. -O. Petrucci , B. Peyaud , S. Pita , H. Poon , H. Prokoph , G. Pühlhofer , M. Punch , A. Quirrenbach , S. Raab , I. Reichardt , A. Reimer , O. Reimer , M. Renaud , R. de los Reyes , F. Rieger , C. Romoli , S. Rosier-Lees , G. Rowell , B. Rudak , C. B. Rulten , V. Sahakian , D. Salek , D. A. Sanchez , A. Santangelo , M. Sasaki , R. Schlickeiser , F. Schüssler , A. Schulz , U. Schwanke , S. Schwemmer , A. S. Seyffert , R. Simoni , H. Sol , F. Spanier , G. Spengler , F. Spies , Ł. Stawarz , R. Steenkamp , C. Stegmann , F. Stinzing , K. Stycz , I. Sushch , J. -P. Tavernet , T. Tavernier , A. M. Taylor , R. Terrier , M. Tluczykont , C. Trichard , K. Valerius , J. van der Walt , C. van Eldik , B. van Soelen , G. Vasileiadis , J. Veh , C. Venter , A. Viana , P. Vincent , J. Vink , F. Voisin , H. J. Völk , T. Vuillaume , S. J. Wagner , P. Wagner , R. M. Wagner , M. Weidinger , Q. Weitzel , R. White , A. Wierzcholska , P. Willmann , A. Wörnlein , D. Wouters , R. Yang , V. Zabalza , D. Zaborov , M. Zacharias , A. A. Zdziarski , A. Zech , F. Zefi , N. Żywucka

Observation of GRB 030131 with the INTEGRAL satellite

A long Gamma-Ray Burst (GRB) was detected with the instruments on board the INTEGRAL satellite on January 31 2003. Although most of the GRB, which lasted $\sim$150 seconds, occurred during a satellite slew, the automatic software of the…

Astrophysics · Physics 2007-05-23 D. Gotz , S. Mereghetti , K. Hurley , S. Deluit , M. Feroci , F. Frontera , A. Fruchter , J. Gorosabel , D. H. Hartmann , J. Hjorth , R. Hudec , I. F. Mirabel , E. Pian , G. Pizzichini , P. Ubertini , C. Winkler

Gamma-ray excess from a stacked sample of high- and intermediate-frequency peaked blazars observed with the MAGIC telescope

Between 2004 and 2009 a sample of 28 X-ray selected high- and intermediate-frequency peaked blazars with a X-ray flux larger than 2 uJy at 1 keV in the redshift range from 0.018 to 0.361 was observed with the MAGIC telescope at energies…

High Energy Astrophysical Phenomena · Physics 2011-03-03 MAGIC Collaboration , J. Aleksić , L. A. Antonelli , P. Antoranz , M. Backes , C. Baixeras , J. A. Barrio , D. Bastieri , J. Becerra González , W. Bednarek , A. Berdyugin , K. Berger , E. Bernardini , A. Biland , O. Blanch , R. K. Bock , G. Bonnoli , P. Bordas , D. Borla Tridon , V. Bosch-Ramon , D. Bose , I. Braun , T. Bretz , D. Britzger , M. Camara , E. Carmona , A. Carosi , P. Colin , S. Commichau , J. L. Contreras , J. Cortina , M. T. Costado , S. Covino , F. Dazzi , A. De Angelis , E. De Cea del Pozo , R. De los Reyes , B. De Lotto , M. De Maria , F. De Sabata , C. Delgado Mendez , M. Doert , A. Domínguez , D. Dominis Prester , D. Dorner , M. Doro , D. Elsaesser , M. Errando , D. Ferenc , M. V. Fonseca , L. Font , R. J. García López , M. Garczarczyk , M. Gaug , N. Godinovic , D. Hadasch , A. Herrero , D. Hildebrand , D. Höhne-Mönch , J. Hose , D. Hrupec , C. C. Hsu , T. Jogler , S. Klepser , T. Krähenbühl , D. Kranich , A. La Barbera , A. Laille , E. Leonardo , E. Lindfors , S. Lombardi , F. Longo , M. López , E Lorenz , P. Majumdar , G. Maneva , N. Mankuzhiyil , K. Mannheim , L. Maraschi , M. Mariotti , M. Martínez , D. Mazin , M. Meucci , J. M. Miranda , R. Mirzoyan , H. Miyamoto , J. Moldón , M. Moles , A. Moralejo , D. Nieto , K. Nilsson , J. Ninkovic , R. Orito , I. Oya , S. Paiano , R. Paoletti , J. M. Paredes , S. Partini , M. Pasanen , D. Pascoli , F. Pauss , R. G. Pegna , M. A. Perez-Torres , M. Persic , L. Peruzzo , F. Prada , E. Prandini , N. Puchades , I. Puljak , I. Reichardt , W. Rhode , M. Ribó , J. Rico , M. Rissi , S. Rügamer , A. Saggion , T. Y. Saito , M. Salvati , M. Sánchez-Conde , K. Satalecka , V. Scalzotto , V. Scapin , C. Schultz , T. Schweizer , M. Shayduk , S. N. Shore , A. Sierpowska-Bartosik , A. Sillanpää , J Sitarek , D. Sobczynska , F. Spanier , S. Spiro , A. Stamerra , B. Steinke , J. C. Struebig , T. Suric , L. Takalo , F. Tavecchio , P. Temnikov , T. Terzic , D. Tescaro , M. Teshima , O. Tibolla , D. F. Torres , H. Vankov , R. M. Wagner , Q. Weitzel , V Zabalza , F. Zandanel , R. Zanin

Results from the binaries LS I +61{\deg}303 and LS 5039 after 2.5 years of Fermi monitoring

The Fermi Large Area Telescope (LAT) has made the first definitive GeV detections of the binaries LS I +61^{\circ}303 and LS5039 in the first year after its launch in August 2008. These detections were unambiguous because, apart from a…

High Energy Astrophysical Phenomena · Physics 2019-08-14 D. Hadasch

Long-term X-ray monitoring of LS I +61 303: analysis of spectral variability and flares

We report on the full analysis of a Rossi X-ray Timing Explorer (RXTE) Proportional Counter Array (PCA) monitoring of the {\gamma}-ray binary system LS I +61 303. The data set covers 42 contiguous cycles of the system orbital motion.…

High Energy Astrophysical Phenomena · Physics 2015-05-27 Jian Li , Diego F. Torres , Shu Zhang , Yupeng Chen , Daniela Hadasch , Paul S. Ray , Peter Kretschmar , Nanda Rea , Jianmin Wang

Discovery of high and very high-energy emission from the BL Lac object SHBL J001355.9-185406

The detection of the high-frequency peaked BL Lac object (HBL) SHBL J001355.9-185406 ($z$=0.095) at high (HE; 100 MeV$<$E$<$300 GeV) and very high-energy (VHE; $E>100\,{\rm GeV}$) with the \fer\ Large Area Telescope (LAT) and the High…

High Energy Astrophysical Phenomena · Physics 2013-11-19 H. E. S. S. Collaboration , : , A. Abramowski , F. Acero , F. Aharonian , A. G. Akhperjanian , E. Angüner , G. Anton , S. Balenderan , A. Balzer , A. Barnacka , Y. Becherini , J. Becker Tjus , K. Bernlöhr , E. Birsin , E. Bissaldi , J. Biteau , C. Boisson , J. Bolmont , P. Bordas , J. Brucker , F. Brun , P. Brun , T. Bulik , S. Carrigan , S. Casanova , M. Cerruti , P. M. Chadwick , R. Chalme-Calvet , R. C. G. Chaves , A. Cheesebrough , M. Chrétien , S. Colafrancesco , G. Cologna , J. Conrad , C. Couturier , M. Dalton , M. K. Daniel , I. D. Davids , B. Degrange , C. Deil , P. deWilt , H. J. Dickinson , A. Djannati-Ataï , W. Domainko , L. O'C. Drury , G. Dubus , K. Dutson , J. Dyks , M. Dyrda , T. Edwards , K. Egberts , P. Eger , P. Espigat , C. Farnier , S. Fegan , F. Feinstein , M. V. Fernandes , D. Fernandez , A. Fiasson , G. Fontaine , A. Förster , M. Füßling , M. Gajdus , Y. A. Gallant , T. Garrigoux , H. Gast , B. Giebels , J. F. Glicenstein , D. Göring , M. -H. Grondin , M. Grudzińska , S. Häffner , J. D. Hague , J. Hahn , J. Harris , G. Heinzelmann , G. Henri , G. Hermann , O. Hervet , A. Hillert , J. A. Hinton , W. Hofmann , P. Hofverberg , M. Holler , D. Horns , A. Jacholkowska , C. Jahn , M. Jamrozy , M. Janiak , F. Jankowsky , I. Jung , M. A. Kastendieck , K. Katarzyński , U. Katz , S. Kaufmann , B. Khélifi , M. Kieffer , S. Klepser , D. Klochkov , W. Kluźniak , T. Kneiske , D. Kolitzus , Nu. Komin , K. Kosack , S. Krakau , F. Krayzel , P. P. Krüger , H. Laffon , G. Lamanna , J. Lefaucheur , M. Lemoine-Goumard , J. -P. Lenain , D. Lennarz , T. Lohse , A. Lopatin , C. -C. Lu , V. Marandon , A. Marcowith , G. Maurin , N. Maxted , M. Mayer , T. J. L. McComb , M. C. Medina , J. Méhault , U. Menzler , M. Meyer , R. Moderski , M. Mohamed , E. Moulin , T. Murach , C. L. Naumann , M. de Naurois , D. Nedbal , J. Niemiec , S. J. Nolan , L. Oakes , S. Ohm , E. de Oña Wilhelmi , B. Opitz , M. Ostrowski , I. Oya , M. Panter , R. D. Parsons , M. Paz Arribas , N. W. Pekeur , G. Pelletier , J. Perez , P. -O. Petrucci , B. Peyaud , S. Pita , H. Poon , G. Pühlhofer , M. Punch , A. Quirrenbach , S. Raab , M. Raue , A. Reimer , O. Reimer , M. Renaud , R. de los Reyes , F. Rieger , L. Rob , S. Rosier-Lees , G. Rowell , B. Rudak , C. B. Rulten , V. Sahakian , D. A. Sanchez , A. Santangelo , R. Schlickeiser , F. Schüssler , A. Schulz , U. Schwanke , S. Schwarzburg , S. Schwemmer , H. Sol , G. Spengler , F. Spieß , Ł. Stawarz , R. Steenkamp , C. Stegmann , F. Stinzing , K. Stycz , I. Sushch , A. Szostek , J. -P. Tavernet , R. Terrier , M. Tluczykont , C. Trichard , K. Valerius , C. van Eldik , G. Vasileiadis , C. Venter , A. Viana , P. Vincent , H. J. Völk , F. Volpe , M. Vorster , S. J. Wagner , P. Wagner , M. Ward , M. Weidinger , R. White , A. Wierzcholska , P. Willmann , A. Wörnlein , D. Wouters , M. Zacharias , A. Zajczyk , A. A. Zdziarski , A. Zech , H. -S. Zechlin

VERITAS Observations of the Nova in V407 Cygni

We report on very high energy (E > 100 GeV) gamma-ray observations of V407 Cygni, a symbiotic binary that underwent a nova outburst producing 0.1-10 GeV gamma rays during 2010 March 10-26. Observations were made with the Very Energetic…

High Energy Astrophysical Phenomena · Physics 2015-06-05 E. Aliu , S. Archambault , T. Arlen , T. Aune , M. Beilicke , W. Benbow , A. Bouvier , S. M. Bradbury , J. H. Buckley , V. Bugaev , K. Byrum , A. Cannon , A. Cesarini , L. Ciupik , E. Collins-Hughes , M. P. Connolly , W. Cui , G. Decerprit , R. Dickherber , C. Duke , J. Dumm , V. V. Dwarkadas , M. Errando , A. Falcone , Q. Feng , J. P. Finley , G. Finnegan , L. Fortson , A. Furniss , N. Galante , D. Gall , S. Godambe , S. Griffin , J. Grube , G. Gyuk , D. Hanna , J. Holder , H. Huan , G. Hughes , T. B. Humensky , P. Kaaret , N. Karlsson , M. Kertzman , Y. Khassen , D. Kieda , H. Krawczynski , F. Krennrich , M. J. Lang , K. Lee , G. Maier , P. Majumdar , S. McArthur , A. McCann , J. Millis , P. Moriarty , R. Mukherjee , P. D Nuñez , R. A. Ong , M. Orr , A. N. Otte , D. Pandel , N. Park , J. S. Perkins , M. Pohl , H. Prokoph , J. Quinn , K. Ragan , L. C. Reyes , P. T. Reynolds , E. Roache , H. J. Rose , J. Ruppel , D. B. Saxon , M. Schroedter , G. H. Sembroski , C. Skole , A. W. Smith , D. Staszak , I. Telezhinsky , G. Tešić , M. Theiling , S. Thibadeau , K. Tsurusaki , J. Tyler , A. Varlotta , S. Vincent , M. Vivier , S. P. Wakely , J. E. Ward , T. C. Weekes , A. Weinstein , T. Weisgarber , R. Welsing , D. A. Williams , B. Zitzer

High Energy Astrophysics

The development of the atmospheric Cherenkov imaging technique has led to significant advances in gamma-ray detection sensitivity in the energy range from 200 GeV to 50 TeV. The Whipple Observatory 10m reflector has detected the first…

Astrophysics · Physics 2007-05-23 T. C. Weekes

Observation of VHE gamma-ray emission from the Active Galactic Nucleus 1ES1959+650 using the MAGIC telecope

The MAGIC Cherenkov telescope has observed very high energy (VHE) gamma-ray emission from the Active Galactic Nucleus 1ES1959+650 during six hours in September and October 2004. The observations were carried out alternated with the Crab…

Astrophysics · Physics 2009-11-13 J. Albert et al.

Detection of Very-High Energy Gamma-Rays from the BL Lac Object PG 1553+113 with the MAGIC Telescope

The MAGIC telescope has observed very-high energy gamma-ray emission from the BL Lac object PG 1553+113 in 2005 and 2006 at an overall significance is 8.8 sigma. The light curve shows no significant flux variations on a daily timescale. The…

Astrophysics · Physics 2019-08-15 Robert Wagner , Daniela Dorner , Masaaki Hayashida , Thomas Hengstebeck , Daniel Kranich , Daniel Mazin , Diego Tescaro , Nina Nowak

Discovery of the Binary Pulsar PSR B1259-63 in Very-High-Energy Gamma Rays around Periastron with H.E.S.S

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 observations around the 2004 periastron…

Astrophysics · Physics 2009-11-11 F. Aharonian

Cosmic gamma-ray burst 060428C detected in the fields of view of the IBIS and SPI telescopes of the INTEGRAL observatory and its early afterglow

Analyzing archival data of the INTEGRAL observatory we discovered and localized a cosmic gamma-ray burst detected within fields of view of the IBIS/ISGRI and SPI telescopes on April 28, 2006. The burst has not been revealed by the INTEGRAL…

Astrophysics · Physics 2009-11-13 S. A. Grebenev , I. V. Chelovekov

Achromatic rapid flares in hard X-rays in the $\gamma$-ray binary LS I +61-303

We report on the presence of very rapid hard X-ray variability in the $\gamma$-ray binary LS I +61 303. The results were obtained by analysing NuSTAR data, which show two achromatic strong flares on ks time-scales before apastron. The…

High Energy Astrophysical Phenomena · Physics 2023-08-09 Enzo A. Saavedra , Gustavo E. Romero , Valenti Bosch-Ramon , Elina Kefala

The TeV spectrum of H1426+428

The BL Lac object H1426+428 was recently detected as a high energy gamma-ray source by the VERITAS collaboration (Horan et al. 2002). We have reanalyzed the 2001 portion of the data used in the detection in order to examine the spectrum of…

Astrophysics · Physics 2008-11-26 D. Petry , I. H. Bond , S. M. Bradbury , J. H. Buckley , D. A. Carter-Lewis , W. Cui , C. Duke , I. de la Calle Perez , A. Falcone , D. J. Fegan , S. J. Fegan , J. P. Finley , J. A. Gaidos , K. Gibbs , S. Gammell , J. Hall , T. A. Hall , A. M. Hillas , J. Holder , D. Horan , M. Jordan , M. Kertzman , D. Kieda , J. Kildea , J. Knapp , K. Kosack , F. Krennrich , S. LeBohec , P. Moriarty , D. Müller , T. N. Nagai , R. Ong , M. Page , R. Pallassini , B. Power-Mooney , J. Quinn , N. W. Reay , P. T. Reynolds , H. J. Rose , M. Schroedter , G. H. Sembroski , R. Sidwell , N. Stanton , S. P. Swordy , V. V. Vassiliev , S. P. Wakely , G. Walker , T. C. Weekes

Multiwavelength observations of the blazar BL Lacertae: a new fast TeV gamma-ray flare

Combined with very-long-baseline interferometry measurements, the observations of fast TeV gamma-ray flares probe the structure and emission mechanism of blazar jets. However, only a handful of such flares have been detected to date, and…

High Energy Astrophysical Phenomena · Physics 2018-06-08 A. U. Abeysekara , W. Benbow , R. Bird , T. Brantseg , R. Brose , M. Buchovecky , J. H. Buckley , V. Bugaev , M. P. Connolly , W. Cui , M. K. Daniel , A. Falcone , Q. Feng , J. P. Finley , L. Fortson , A. Furniss , G. H. Gillanders , I. Gunawardhana , M. Hütten , D. Hanna , O. Hervet , J. Holder , G. Hughes , T. B. Humensky , C. A. Johnson , P. Kaaret , P. Kar , M. Kertzman , F. Krennrich , M. J. Lang , T. T. Y. Lin , S. McArthur , P. Moriarty , R. Mukherjee , S. O'Brien , R. A. Ong , A. N. Otte , N. Park , A. Petrashyk , M. Pohl , E. Pueschel , J. Quinn , K. Ragan , P. T. Reynolds , G. T. Richards , E. Roache , C. Rulten , I. Sadeh , M. Santander , G. H. Sembroski , K. Shahinyan , S. P. Wakely , A. Weinstein , R. M. Wells , P. Wilcox , D. A. Williams , B. Zitzer , S. G. Jorstad , A. P. Marscher , M. L. Lister , Y. Y. Kovalev , A. B. Pushkarev , T. Savolainen , I. Agudo , S. N. Molina , J. L. Gómez , V. M. Larionov , G. A. Borman , A. A. Mokrushina , M. Tornikoski , A. Lähteenmäki , W. Chamani , S. Enestam , S. Kiehlmann , T. Hovatta , P. S. Smith , P. Pontrelli

Variability in the orbital profiles of the X-ray emission of the gamma-ray binary LS I +61 303

We report on the analysis of Rossi X-ray Timing Explorer (RXTE) Proportional Counter Array (PCA) monitoring observations of the $\gamma$-ray binary system LS I +61 303, covering 35 full cycles of its orbital motion. This constitutes the…

High Energy Astrophysical Phenomena · Physics 2015-05-19 Diego F. Torres , Shu Zhang , Jian Li , Nanda Rea , G. Andrea Caliandro , Daniela Hadasch , Yupeng Chen , Jianmin Wang , Paul S. Ray