Related papers: Hard fast X-ray transients as possible counterpart…

Transient X-ray sources in the field of the Unidentified Gamma-Ray Source TeV J2032+4130 in Cygnus

We present an analysis of Chandra ACIS observations of the field of TeV J2032+4130, the first unidentified TeV source, detected serendipitously by HEGRA. This deep (48.7 ksec) observation of the field follows up on an earlier 5 ksec Chandra…

Astrophysics · Physics 2008-11-26 R. Mukherjee , E. V. Gotthelf , J. P. Halpern

Multiwavelength Evidence for Two New Candidate Transitional Millisecond Pulsars in the Sub-luminous Disk State: 4FGL J0639.1--8009 and 4FGL J1824.2+1231

We report the discovery of two new Galactic accreting compact objects consistent with the respective positions of the unassociated Fermi-LAT gamma-ray sources 4FGL J0639.1--8009 and 4FGL J1824.2+1231. A combination of new and archival X-ray…

High Energy Astrophysical Phenomena · Physics 2025-04-17 Rebecca Kyer , Subhroja Roy , Jay Strader , Ryan Urquhart , Isabella Molina , Peter Craig , Laura Chomiuk

Discovery of a new supergiant fast X-ray transient MAXI J0709-159 associated with the Be star LY CMa

We report on the discovery of a new supergiant fast X-ray transient (SFXT), MAXI J0709$-$159, and its identification with LY CMa (also known as HD 54786). On 2022 January 25, a new flaring X-ray object named MAXI J0709$-$159, was detected…

High Energy Astrophysical Phenomena · Physics 2022-08-03 Mutsumi Sugizaki , Tatehiro Mihara , Kohei Kobayashi , Hitoshi Negoro , Megumi Shidatsu , Sean N. Pike , Wataru Iwakiri , Sota Urabe , Motoko Serino , Nobuyuki Kawai , Motoki Nakajima , Jamie A. Kennea , Zhu Liu

Search for TeV Gamma-ray Emission from GRB 100621A, an extremely bright GRB in X-rays, with H.E.S.S

The long gamma-ray burst (GRB) 100621A, at the time the brightest X-ray transient ever detected by Swift-XRT in the $0.3\textrm{--}10$ keV range, has been observed with the H.E.S.S. imaging air Cherenkov telescope array, sensitive to gamma…

High Energy Astrophysical Phenomena · Physics 2014-05-06 H. E. S. S. Collaboration , A. Abramowski , F. Aharonian , F. Ait Benkhali , 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 , M. Böttcher , 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 , B. Giebels , J. F. Glicenstein , M. -H. Grondin , M. Grudzińska , S. Häffner , 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 , A. Lemière , M. Lemoine-Goumard , J. -P. Lenain , D. Lennarz , T. Lohse , A. Lopatin , C. -C. Lu , V. Marandon , A. Marcowith , R. Marx , G. Maurin , N. Maxted , M. Mayer , T. J. L. McComb , J. Méhault , U. Menzler , M. Meyer , R. Moderski , M. Mohamed , E. Moulin , T. Murach , C. L. Naumann , M. de Naurois , J. Niemiec , S. J. Nolan , L. Oakes , P. T. O'Brien , 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 , C. Romoli , 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. Spies , Ł. Stawarz , R. Steenkamp , C. Stegmann , F. Stinzing , K. Stycz , I. Sushch , A. Szostek , P. H. T. Tam , J. -P. Tavernet , T. Tavernier , A. M. Taylor , 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 , Q. Weitzel , R. White , A. Wierzcholska , P. Willmann , A. Wörnlein , D. Wouters , M. Zacharias , A. Zajczyk , A. A. Zdziarski , A. Zech , H. -S. Zechlin

XMM-Newton and NuSTAR simultaneous X-ray observations of IGR J11215-5952

We report the results of an XMM-Newton and NuSTAR coordinated observation of the Supergiant Fast X-ray Transient (SFXT) IGRJ11215-5952, performed on February 14, 2016, during the expected peak of its brief outburst, which repeats every…

High Energy Astrophysical Phenomena · Physics 2017-04-12 L. Sidoli , A. Tiengo , A. Paizis , V. Sguera , S. Lotti , L. Natalucci

X-ray Pulsations from the region of the Supergiant Fast X-ray Transient IGR J17544-2619

Phase-targeted RXTE observations have allowed us to detect a transient 71.49 \pm 0.02 s signal that is most likely to be originating from the supergiant fast X-ray transient IGR J17544-2619. The phase-folded light curve shows a possible…

High Energy Astrophysical Phenomena · Physics 2015-06-03 S. P. Drave , A. J. Bird , L. J. Townsend , A. B. Hill , V. A. McBride , V. Sguera , A. Bazzano , D. J. Clark

Two years of monitoring Supergiant Fast X-ray Transients with Swift

We present two years of intense Swift monitoring of three SFXTs, IGR J16479-4514, XTE J1739-302, and IGR J17544-2619 (since October 2007). Out-of-outburst intensity-based X-ray (0.3-10keV) spectroscopy yields absorbed power laws with by…

High Energy Astrophysical Phenomena · Physics 2010-10-20 P. Romano , V. La Parola , S. Vercellone , G. Cusumano , L. Sidoli , H. A. Krimm , C. Pagani , P. Esposito , E. A. Hoversten , J. A. Kennea , K. L. Page , D. N. Burrows , N. Gehrels

Discovery of Three Candidate Magnetar-powered Fast X-ray Transients from Chandra Archival Data

It was proposed that a remnant stable magnetar could be formed in a binary neutron-star merger, leading to a fast X-ray transient (FXT) that can last for thousands of seconds. Recently, Xue et al. suggested that CDF-S XT2 was exactly such a…

High Energy Astrophysical Phenomena · Physics 2022-03-30 Dacheng Lin , Jimmy A. Irwin , Edo Berger , Ronny Nguyen

XMM-Newton discovery of very high obscuration in the candidate Supergiant Fast X-ray Transient AX J1714.1-3912

We have analysed an archival XMM-Newton EPIC observation that serendipitously covered the sky position of a variable X-ray source AX J1714.1-3912, previously suggested to be a Supergiant Fast X-ray Transient (SFXT). During the XMM-Newton…

High Energy Astrophysical Phenomena · Physics 2022-03-30 L. Sidoli , V. Sguera , P. Esposito , L. Oskinova , M. Polletta

Identifying Two Newly Discovered Black Hole X-ray Transients in the Galactic Center

We analyze the two unclassified newly outbursting X-ray binary transients in the galactic center, Swift J174540.7-290015 and Swift J174540.2-290037, in an attempt to identify the nature of these sources. We engage in a thorough spectral…

High Energy Astrophysical Phenomena · Physics 2021-11-09 Byeong Yeon Ryu

First hard X-ray detection and broad band X-ray study of the unidentified transient AX J1949.8+2534

We present the results from INTEGRAL and Swift/XRT observations of the hitherto poorly studied unidentified X-ray transient AX J1949.8+2534, and on archival multiwavelength observations of field objects. Bright hard X-ray outbursts have…

High Energy Astrophysical Phenomena · Physics 2017-06-28 V. Sguera , L. Sidoli , A. Paizis , N. Masetti , A. J. Bird , A. Bazzano

Redshifts of candidate host galaxies of four fast X-ray transients using VLT/MUSE

Fast X-ray transients (FXTs) are X-ray flares lasting minutes to hours. Multi-wavelength counterparts to these FXTs have been proven hard to find. As a result distance measurements are through indirect methods such as host galaxy…

High Energy Astrophysical Phenomena · Physics 2024-09-25 Anne Inkenhaag , Peter G. Jonker , Andrew J. Levan , Jonathan Quirola-Vásquez , Franz E. Bauer , Deepak Eappachen

GRB070610 : A Curious Galactic Transient

GRB 070610 is a typical high-energy event with a duration of 5s.Yet within the burst localization we detect a highly unusual X-ray and optical transient, SwiftJ195509.6+261406. We see high amplitude X-ray and optical variability on very…

Astrophysics · Physics 2009-11-13 M. M. Kasliwal , S. B. Cenko , S. R. Kulkarni , P. B. Cameron , E. Nakar , E. O. Ofek , A. Rau , A. M. Soderberg , S. Campana , J. S. Bloom , D. A. Perley , L. Pollack , S. Barthelmy , J. Cummings , N. Gehrels , H. A. Krimm , C. B. Markwardt , G. Sato , P. Chandra , D. Frail , D. B. Fox , P. Price , E. Berger , S. A. Grebenev , R. A. Krivonos , R. A. Sunyaev

The counterpart/s of IGR J20159+3713/SWIFT J2015.9+3715: dissecting a complex region with emission from keV to TeV

We report on the identification of a new soft gamma-ray source, namely IGR J20159+3713/SWIFT J2015.9+3715, first detected by INTEGRAL/IBIS and then confirmed by Swift/BAT. The source, which has an observed 20-100 keV flux in the range…

High Energy Astrophysical Phenomena · Physics 2015-06-17 L. Bassani , R. Landi , A. Malizia , J. B. Stephen , A. Bazzano , A. J. Bird , P. Ubertini

XMM-Newton observations of five INTEGRAL sources located towards the Scutum Arm

Results are presented for XMM-Newton observations of five hard X-ray sources discovered by INTEGRAL in the direction of the Scutum Arm. Each source received more than 20 ks of effective exposure time. We provide refined X-ray positions for…

High Energy Astrophysical Phenomena · Physics 2015-06-04 Arash Bodaghee , John A. Tomsick , Jerome Rodriguez

Obscured sources and Supergiant Fast X-ray Transients: new classes of high mass X-ray binaries

A new type of high-energy binary systems has been revealed by the INTEGRAL satellite. These sources are in the course of being unveiled by means of multi-wavelength optical, near- and mid-infrared observations. Among these sources, two…

Astrophysics · Physics 2007-10-02 Sylvain Chaty

Multi-wavelength observations of Galactic hard X-ray sources discovered by INTEGRAL. II. The environment of the companion star

Context: The INTEGRAL mission has led to the discovery of a new type of supergiant X-ray binaries (SGXBs), whose physical properties differ from those of previously known SGXBs. Those sources are in the course of being unveiled by means of…

Astrophysics · Physics 2009-11-13 Farid Rahoui , Sylvain Chaty , Pierre-Olivier Lagage , Eric Pantin

A fast X-ray transient from a weak relativistic jet associated with a type Ic-BL supernova

Massive stars end their lives as core-collapse supernovae, amongst which some extremes are broad-lined type Ic supernovae from Wolf-Rayet stars associated with long-duration gamma-ray bursts (LGRBs) having powerful relativistic jets. Their…

High Energy Astrophysical Phenomena · Physics 2025-07-15 H. Sun , W. -X. Li , L. -D. Liu , H. Gao , X. -F. Wang , W. Yuan , B. Zhang , A. V. Filippenko , D. Xu , T. An , S. Ai , T. G. Brink , Y. Liu , Y. -Q. Liu , C. -Y. Wang , Q. -Y. Wu , X. -F. Wu , Y. Yang , B. -B. Zhang , W. -K. Zheng , T. Ahumada , Z. -G. Dai , J. Delaunay , N. Elias-Rosa , S. Benetti , S. -Y. Fu , D. A. Howell , Y. -F. Huang , M. M. Kasliwal , V. Karambelkar , R. Stein , W. -H. Lei , T. -Y. Lian , Z. -K. Peng , D. D. Frederiks , A. V. Ridnaia , D. S. Svinkin , X. -Y. Wang , A. -L. Wang , D. -M. Wei , J. An , M. Andrews , J. -M Bai , C. -Y. Dai , S. A. Ehgamberdiev , Z. Fan , J. Farah , H. -C. Feng , J. P. U. Fynbo , W. -J. Guo , Z. Guo , M. -K. Hu , J. -W. Hu , S. -Q. Jiang , J. -J. Jin , A. Li , J. -D. Li , R. -Z. Li , Y. -F. Liang , Z. -X. Ling , X. Liu , J. -R. Mao , C. McCully , D. Mirzaqulov , M. Newsome , E. Padilla Gonzalez , X. Pan , G. Terreran , S. Tinyanont , B. -T. Wang , L. -Z. Wang , X. -D. Wen , D. -F. Xiang , S. -J. Xue , J. Yang , Z. -P. Zhu , Z. -M. Cai , A. J. Castro-Tirado , F. -S. Chen , H. -L. Chen , T. -X. Chen , W. Chen , Y. -H. Chen , Y. -F. Chen , Y. Chen , H. -Q. Cheng , B. Cordier , C. -Z. Cui , W. -W. Cui , Y. -F. Dai , D. -W. Fan , H. Feng , J. Guan , D. -W. Han , D. -J. Hou , H. -B. Hu , M. -H. Huang , J. Huo , S. -M. Jia , Z. -Q. Jia , B. -W. Jiang , C. -C. Jin , G. Jin , E. Kuulkers , C. -K. Li , D. -Y. Li , J. -F. Li , L. -H. Li , M. -S. Li , W. Li , Z. -D. Li , C. -Z Liu , H. -Y. Liu , H. -Q. Liu , M. -J. Liu , F. -J. Lu , L. -D. Luo , J. Ma , X. Mao , K. Nandra , P. O'Brien , H. -W. Pan , A. Rau , N. Rea , J. Sanders , L. -M. Song , S. -L. Sun , X. -J. Sun , Y. -Y. Tan , Q. -J. Tang , Y. -H. Tao , H. Wang , J. Wang , L. Wang , W. -X. Wang , Y. -L. Wang , Y. -S. Wang , D. -R. Xiong , H. -T. Xu , J. -J. Xu , X. -P. Xu , Y. -F. Xu , Z. Xu , C. -B. Xue , Y. -L. Xue , A. -L. Yan , H. -N. Yang , X. -T. Yang , Y. -J. Yang , C. Zhang , J. Zhang , M. Zhang , S. -N. Zhang , W. -D. Zhang , W. -J. Zhang , Y. -H. Zhang , Z. Zhang , Z. Zhang , Z. -L. Zhang , D. -H. Zhao , H. -S. Zhao , X. -F. Zhao , Z. -J. Zhao , Y. -L. Zhou , Y. -X. Zhu , Z. -C. Zhu , H. Zou

A fast X-ray transient with chromatic flares: signatures of violent collisions induced by late-time central engine reactivation

Extragalactic Fast X-ray Transients (EFXTs) represent an emerging class of high-energy phenomena characterized by X-ray outbursts lasting from tens to hundreds of seconds. However, for more than half of the EFXTs, their physical origins…

High Energy Astrophysical Phenomena · Physics 2026-04-17 Shao-Yu Fu , Cui-Yuan Dai , Ai-Ling Wang , Dong Xu , Tao An , Jin-Jun Geng , Wei-Hua Lei , Xiang-Yu Wang , Shuai-Qing Jiang , Zi-Pei Zhu , Xing Liu , Jie An , Lin-Bo He , Jun-Jie Jin , Yu Zhang , Jinlei Zhang , Zhou Fan , Xing Gao , Abdusamatjan Iskandar , Shahidin Yaqup , Tu-Hong Zhong , Ali Esamdin , Chun-Hai Bai , Yu Zhang , He Gao , Xue-Feng Wu , Daniele Bjørn Malesani , Luca Izzo , R. A. J. Eyles-Ferris , A. Saccardi , B. Schneider , J. Palmerio , N. R. Tanvir , Alexei Pozanenko , Nicolai Pankov , A. S. Moskvitin , O. I. Spiridonova , O. A. Maslennikova , A. Volnova , E. Klunko , V. Rumyantsev , A. Volvach , L. Volvach , Toktarkhan Komesh , Ernazar Abdikamalov , Dilda Berdikhan , Zhanat Maksut , Yuan-Chuan Zou , Hong-Zhou Wu , Yun-Wei Yu , Rong-Feng Shen , Yi-Han Wang , Hui Sun , Bin-Bin Zhang , Liang-Duan Liu , Ye Li , Valerio D'Elia , Ruben Salvaterra , Massimiliano De Pasquale , Bing Zhang , Wei-Min Yuan

The INTEGRAL - HESS/MAGIC connection: a new class of cosmic high energy accelerators from keV to TeV

The recent completion and operation of the High Energy Stereoscopic System, an array of ground based imaging Cherenkov telescopes, has provided a survey with unprecedented sensitivity of the inner part of the Galaxy and revealed a new…

Astrophysics · Physics 2008-11-26 Pietro Ubertini