Related papers: Einstein Probe discovery of EP J005245.1-722843: a…

The curious case of EP241021a: Unraveling the mystery of its exceptional rebrightening

Fast X-ray Transients (FXTs) are a rare and poorly understood phenomenon with a variety of possible progenitors. The launch of the Einstein Probe (EP) mission has facilitated a rapid increase in the real-time discovery and follow-up of…

High Energy Astrophysical Phenomena · Physics 2025-09-17 Malte Busmann , Brendan O'Connor , Julian Sommer , Daniel Gruen , Paz Beniamini , Ramandeep Gill , Michael J. Moss , Antonella Palmese , Arno Riffeser , Yu-Han Yang , Eleonora Troja , Simone Dichiara , Roberto Ricci , Noel Klingler , Claus Gössl , Lei Hu , Arne Rau , Christoph Ries , Geoffrey Ryan , Michael Schmidt , Muskan Yadav , Gregory R. Zeimann

XMM-Newton observations of High Mass X-ray Binaries in the SMC

Based on XMM-Newton EPIC data of four pointings towards the Small Magellanic Cloud (SMC), results on timing and spectral analyses of 16 known high mass X-ray binaries (HMXBs) and HMXB candidates in the SMC are presented. We confirm the…

Astrophysics · Physics 2009-11-07 Manami Sasaki , Wolfgang Pietsch , Frank Haberl

An X-ray view of the 2021 outburst of SXP 15.6: constraints on the binary orbit and magnetic field of the Neutron Star

We conducted a spectral and temporal analysis of X-ray data from the Be X-ray binary pulsar SXP 15.6 located in the Small Magellanic Cloud based on NuSTAR, NICER and Swift observations during the 2021 outburst. We present for the first time…

High Energy Astrophysical Phenomena · Physics 2022-08-31 G. Vasilopoulos , G. K. Jaisawal , C. Maitra , F. Haberl , P. Maggi , A. S. Karaferias

The binary period and outburst behaviour of the SMC X-ray binary pulsar system SXP504

A probable binary period has been detected in the optical counterpart to the X-ray source CXOU J005455.6-724510 = RX J0054.9-7245 = AXJ0054.8-7244 = SXP504 in the Small Magellanic Cloud. This source was detected by Chandra on 04 Jul 2002…

Astrophysics · Physics 2009-11-11 W. R. T. Edge , M. J. Coe , J. L. Galache , V. A. McBride , R. H. D. Corbet , A. T. Okazaki , S. Laycock , C. B. Markwardt , F. E. Marshall , A. Udalski

Supersoft X-ray sources identified with Be binaries in the Magellanic Clouds

We investigated four luminous supersoft X-ray sources (SSS) in the Magellanic Clouds suspected to have optical counterparts of Be spectral type. If the origin of the X-rays is in a very hot atmosphere heated by hydrogen burning in accreted…

Solar and Stellar Astrophysics · Physics 2018-08-15 V. Cracco , M. Orio , S. Ciroi , J. S. Gallagher , R. Kotulla , E. Romero-Colmenero

SXP7.92: A Recently Rediscovered Be/X-ray Binary in the Small Magellanic Cloud, Viewed Edge On

We present a detailed optical and X-ray study of the 2013 outburst of the Small Magellanic Cloud Be/X-ray binary SXP7.92, as well as an overview of the last 18 years of observations from OGLE, RXTE, Chandra and XMM-Newton. We revise the…

High Energy Astrophysical Phenomena · Physics 2017-01-18 E. S. Bartlett , M. J. Coe , G. L. Israel , J. S. Clark , P. Esposito , V. D'Elia , A. Udalski

eROSITA calibration and performance verification phase: High-mass X-ray binaries in the Magellanic Clouds

During its performance verification phase, the soft X-ray instrument eROSITA aboard the Spektrum-Roentgen-Gamma(SRG) spacecraft observed large regions in the Magellanic Clouds, where almost 40 known high-mass X-ray binaries (HMXBs,…

High Energy Astrophysical Phenomena · Physics 2022-05-18 F. Haberl , C. Maitra , S. Carpano , X. Dai , V. Doroshenko , K. Dennerl , M. J. Freyberg , M. Sasaki , A. Udalski , K. A. Postnov , N. I. Shakura

The soft X-ray transient EP241021a: A cosmic explosion with a complex off-axis jet and cocoon from a massive progenitor

X-ray flashes (XRFs) are fast X-ray transients thought to be softer analogs of gamma-ray bursts (GRBs). With its soft X-ray sensitivity, the Einstein Probe (EP) provides a unique opportunity to study these events. We report multiwavelength…

High Energy Astrophysical Phenomena · Physics 2025-11-12 Giulia Gianfagna , Luigi Piro , Gabriele Bruni , Aishwarya Linesh Thakur , Hendrik Van Eerten , Maria D. Caballero-García , Alberto Castro-Tirado , Yong Chen , Ye-hao Cheng , Maria Gritsevich , Sergiy Guziy , Han He , You-Dong Hu , Shumei Jia , Zhixing Ling , Elisabetta Maiorano , Rosita Paladino , Shashi B. Pandey , Roberta Tripodi , Andrea Rossi , Rubén Sánchez-Ramírez , Shuaikang Yang , Jianghui Yuan , Weimin Yuan , Chen Zhang

Detection of an Extremely Luminous Radio Counterpart to the Be/X-ray Binary A0538-66

We present the discovery of radio emission from the Be/X-ray binary A0538-66 with the Australian Square Kilometre Array Pathfinder (ASKAP), and results from a subsequent weekly monitoring campaign with the MeerKAT radio telescope. A0538-66,…

High Energy Astrophysical Phenomena · Physics 2026-02-02 Justine Crook-Mansour , Rob Fender , Alex Andersson , Hao Qiu , Andrew K. Hughes , Jakob van den Eijnden , Fraser J. Cowie , Sara Motta , Itumeleng Monageng , Lorenzo Ducci , Sandro Mereghetti , Andries Mathiba , Dougal Dobie , Tara Murphy , David L. Kaplan , Francesco Carotenuto , Phil Charles

Multi-band observations of Swift J0840.7-3516: a new transient ultra-compact X-ray binary candidate

We report on multi-band observations of the transient source Swift J0840.7-3516, which was detected in outburst in 2020 February by the Neil Gehrels Swift Observatory. The outburst episode lasted just ~5 days, during which the X-ray…

High Energy Astrophysical Phenomena · Physics 2021-06-09 F. Coti Zelati , A. de Ugarte Postigo , T. D. Russell , A. Borghese , N. Rea , P. Esposito , G. L. Israel , S. Campana

AstroSat Observation of Recent Outburst in the Be/X-ray Binary LS V +4417/RX J0440.9+4431

A Be/X-ray binary system known as RX J0440.9+4431 (or LS V +44 17) is a potential member of the uncommon gamma-ray binary class. With an orbital period of 150 days, this system consists of a neutron star and a Be star companion. The MAXI…

High Energy Astrophysical Phenomena · Physics 2024-02-09 Arshad Hussain , Umananda Dev Goswami

Spectral and timing analysis of BeXRB eRASSU J050810.4-660653 recently discovered in the Large Magellanic Cloud (LMC)

We have studied the Be/X-ray binary (BeXRB) pulsar eRASSU J050810.4-660653 recently discovered in the Large Magellanic Cloud (LMC). Timing and spectral features of the source have been discussed in detail using NuSTAR \& XMM-Newton…

High Energy Astrophysical Phenomena · Physics 2022-11-30 Manoj Ghising , Mohammed Tobrej , Ruchi Tamang , Binay Rai , Bikash Chandra Paul

Study of Recent outburst in the Be/X-ray binary RX J0209.6-7427 with AstroSat: A new ultraluminous X-ray pulsar in the Magellanic Bridge?

We present the timing and spectral studies of RX J0209.6-7427 during its rare 2019 outburst using observations with the Soft X-ray Telescope (SXT) and Large Area X-ray Proportional Counter (LAXPC) instruments on the AstroSat satellite.…

High Energy Astrophysical Phenomena · Physics 2022-04-26 Amar Deo Chandra , Jayashree Roy , P. C. Agrawal , Manojendu Choudhury

Soft X-ray prompt emission from a high-redshift gamma-ray burst EP240315a

Long gamma-ray bursts (GRBs) are believed to originate from core collapse of massive stars. High-redshift GRBs can probe the star formation and reionization history of the early universe, but their detection remains rare. Here we report the…

High Energy Astrophysical Phenomena · Physics 2024-04-26 Y. Liu , H. Sun , D. Xu , D. S. Svinkin , J. Delaunay , N. R. Tanvir , H. Gao , C. Zhang , Y. Chen , X. -F. Wu , B. Zhang , W. Yuan , J. An , G. Bruni , D. D. Frederiks , G. Ghirlanda , J. -W. Hu , A. Li , C. -K. Li , J. -D. Li , D. B. Malesani , L. Piro , G. Raman , R. Ricci , E. Troja , S. D. Vergani , Q. -Y. Wu , J. Yang , B. -B. Zhang , Z. -P. Zhu , A. de Ugarte Postigo , A. G. Demin , D. Dobie , Z. Fan , S. -Y. Fu , J. P. U. Fynbo , J. -J. Geng , G. Gianfagna , Y. -D. Hu , Y. -F. Huang , S. -Q. Jiang , P. G. Jonker , Y. Julakanti , J. A. Kennea , A. A. Kokomov , E. Kuulkers , W. -H. Lei , J. K. Leung , A. J. Levan , D. -Y. Li , Y. Li , S. P. Littlefair , X. Liu , A. L. Lysenko , Y. -N. Ma , A. Martin-Carrillo , P. O'Brien , T. Parsotan , J. Quirola-Vasquez , A. V. Ridnaia , S. Ronchini , A. Rossi , D. Mata-Sanchez , B. Schneider , R. -F. Shen , A. L. Thakur , A. Tohuvavohu , M. A. P. Torres , A. E. Tsvetkova , M. V. Ulanov , J. -J. Wei , D. Xiao , Y. -H. I. Yin , M. Bai , V. Burwitz , Z. -M. Cai , F. -S. Chen , H. -L. Chen , T. -X. Chen , W. Chen , Y. -F. Chen , Y. -H. Chen , H. -Q. Cheng , C. -Z. Cui , W. -W. Cui , Y. -F. Dai , Z. -G. Dai , J. Eder , D. -W. Fan , C. Feldman , H. Feng , Z. Feng , P. Friedrich , X. Gao , J. Guan , D. -W Han , J. Han , D. -J. Hou , H. -B. Hu , T. Hu , M. -H. Huang , J. Huo , I. Hutchinson , Z. Ji , S. -M. Jia , Z. -Q. Jia , B. -W. Jiang , C. -C. Jin , G. Jin , J. -J. Jin , A. Keereman , H. Lerman , J. -F. Li , L. -H. Li , M. -S. Li , W. Li , Z. -D. Li , T. -Y. Lian , E. -W. Liang , Z. -X. Ling , C. -Z. Liu , H. -Y. Liu , H. -Q. Liu , M. -J. Liu , Y. -R. Liu , F. -J. Lu , H. -J. LU , L. -D. Luo , F. L. Ma , J. Ma , J. -R. Mao , X. Mao , M. McHugh , N. Meidinger , K. Nandra , J. P. Osborne , H. -W. Pan , X. Pan , M. E. Ravasio , A. Rau , N. Rea , U. Rehman , J. Sanders , A. Santovincenzo , L. -M. Song , J. Su , L. -J. Sun , S. -L. Sun , X. -J. Sun , Y. -Y. Tan , Q. -J. Tang , Y. -H. Tao , J. -Z. Tong , H. Wang , J. Wang , L. Wang , W. -X. Wang , X. -F. Wang , X. -Y. Wang , Y. -L. Wang , Y. -S. Wang , D. -M. Wei , R. Willingale , S. -L. Xiong , H. -T. Xu , J. -J. Xu , X. -P. Xu , Y. -F. Xu , Z. Xu , C. -B. Xue , Y. -L. Xue , A. -L. Yan , F. Yang , H. -N. Yang , X. -T. Yang , Y. -J Yang , Y. -W. Yu , 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 , L. -X. Zhou , Y. -L. Zhou , Y. -X. Zhu , Z. -C. Zhu , X. -X. Zuo

NICER and Fermi GBM Observations of the First Galactic Ultraluminous X-ray Pulsar Swift J0243.6+6124

Swift J0243.6+6124 is a newly discovered Galactic Be/X-ray binary, revealed in late September 2017 in a giant outburst with a peak luminosity of 2E+39 (d/7 kpc)^2 erg/s (0.1-10 keV), with no formerly reported activity. At this luminosity,…

High Energy Astrophysical Phenomena · Physics 2018-08-15 C. A. Wilson-Hodge , C. Malacaria , P. A. Jenke , G. K. Jaisawal , M. Kerr , M. T. Wolff , Z. Arzoumanian , D. Chakrabarty , J. P. Doty , K. C. Gendreau , S. Guillot , W. C. G. Ho , B. LaMarr , C. B. Markwardt , F. Ozel , G. Y. Prigozhin , P. S. Ray , M. Ramos-Lerate , R. A. Remillard , T. E. Strohmayer , M. L. Vezie , K. S. Wood

Discovery of four super-soft X-ray sources in XMM-Newton observations of the Large Magellanic Cloud

Super-soft X-ray sources were established as a heterogeneous class of objects from observations of the Large Magellanic Cloud (LMC). We have searched for new sources of this class in the X-ray images obtained from the XMM-Newton survey of…

High Energy Astrophysical Phenomena · Physics 2021-12-29 Chandreyee Maitra , Frank Haberl

Spectral properties of the soft excess pulsar RX J0059.2-7138 during its 2013 outburst

We report on an X-ray observation of the Be X-ray Binary Pulsar RX J0059.2-7138, performed by XMM-Newton in March 2014. The 19 ks long observation was carried out about three months after the discovery of the latest outburst from this Small…

High Energy Astrophysical Phenomena · Physics 2015-06-24 L. Sidoli , N. La Palombara , P. Esposito , A. Tiengo , S. Mereghetti

The 2016 super-Eddington outburst of SMC X-3: X-ray and optical properties and system parameters

On 2016 July 30 (MJD 57599), observations of the Small Magellanic Cloud by Swift/XRT found an increase in X-ray counts coming from a position consistent with the Be/X-ray binary pulsar SMC X-3. Follow-up observations on 2016 August 3 (MJD…

High Energy Astrophysical Phenomena · Physics 2017-08-30 L. J. Townsend , J. A. Kennea , M. J. Coe , V. A. McBride , D. A. H. Buckley , P. A. Evans , A. Udalski

The Soft X-ray Aspect of Gamma-ray Bursts in the Einstein Probe Era

The Einstein Probe (EP) satellite, dedicated at time-domain high-energy astrophysics and multi-messenger astronomy, was recently launched and successfully put into operation. The wide-field X-ray telescope (WXT, 0.5-4 keV) onboard has…

High Energy Astrophysical Phenomena · Physics 2025-04-22 Hao-Xuan Gao , Jin-Jun Geng , Yi-Fang Liang , Hui Sun , Fan Xu , Xue-Feng Wu , Yong-Feng Huang , Zi-Gao Dai , Wei-Min Yuan

Science objectives of the Einstein Probe mission

The Einstein Probe (EP) is an interdisciplinary mission of time-domain and X-ray astronomy. Equipped with a wide-field lobster-eye X-ray focusing imager, EP will discover cosmic X-ray transients and monitor the X-ray variability of known…

High Energy Astrophysical Phenomena · Physics 2025-01-14 Weimin Yuan , Lixin Dai , Hua Feng , Chichuan Jin , Peter Jonker , Erik Kuulkers , Yuan Liu , Kirpal Nandra , Paul O'Brien , Luigi Piro , Arne Rau , Nanda Rea , Jeremy Sanders , Lian Tao , Junfeng Wang , Xuefeng Wu , Bing Zhang , Shuangnan Zhang , Shunke Ai , Johannes Buchner , Esra Bulbul , Hechao Chen , Minghua Chen , Yong Chen , Yu-Peng Chen , Alexis Coleiro , Francesco Coti Zelati , Zigao Dai , Xilong Fan , Zhou Fan , Susanne Friedrich , He Gao , Chong Ge , Mingyu Ge , Jinjun Geng , Giancarlo Ghirlanda , Giulia Gianfagna , Lijun Gou , Sébastien Guillot , Xian Hou , Jingwei Hu , Yongfeng Huang , Long Ji , Shumei Jia , S. Komossa , Albert K. H. Kong , Lin Lan , An Li , Ang Li , Chengkui Li , Dongyue Li , Jian Li , Zhaosheng Li , Zhixing Ling , Ang Liu , Jinzhong Liu , Liangduan Liu , Zhu Liu , Jiawei Luo , Ruican Ma , Pierre Maggi , Chandreyee Maitra , Alessio Marino , Stephen Chi-Yung Ng , Haiwu Pan , Surangkhana Rukdee , Roberto Soria , Hui Sun , Pak-Hin Thomas Tam , Aishwarya Linesh Thakur , Hui Tian , Eleonora Troja , Wei Wang , Xiangyu Wang , Yanan Wang , Junjie Wei , Sixiang Wen , Jianfeng Wu , Ting Wu , Di Xiao , Dong Xu , Renxin Xu , Yanjun Xu , Yu Xu , Haonan Yang , Bei You , Heng Yu , Yunwei Yu , Binbin Zhang , Chen Zhang , Guobao Zhang , Liang Zhang , Wenda Zhang , Yu Zhang , Ping Zhou , Zecheng Zou