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Galactic transients, X-ray and gamma-ray binaries provide a proper environment for particle acceleration. This leads to the production of gamma rays with energies reaching the GeV-TeV regime. MAGIC has carried out deep observations of…

High Energy Astrophysical Phenomena · Physics 2019-08-14 A. Fernández-Barral , O. Blanch , E. de Oña Wilhelmi , D. F. Torres , C. Fruck , D. Hadasch , A. López-Oramas , P. Munar-Adrover , R. Zanin

The SkyMapper 1.3 m telescope at Siding Spring Observatory has now begun regular operations. Alongside the Southern Sky Survey, a comprehensive digital survey of the entire southern sky, SkyMapper will carry out a search for supernovae and…

Instrumentation and Methods for Astrophysics · Physics 2017-07-26 Richard Scalzo , Fang Yuan , Michael J. Childress , Anais Moller , Brian Schmidt , Brad E. Tucker , Bonnie Zhang , Pierre Astier , Marc Betoule , Nicolas Regnault

A comprehensive search for variable and transient radio sources has been conducted using ~55,000 snapshot images of the FIRST survey. We present an analysis leading to the discovery of 1,627 variable and transient objects down to mJy levels…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-30 Nithyanandan Thyagarajan , David J. Helfand , Richard L. White , Robert H. Becker

The sensitivity and field of view of the MeerKAT radio telescope provides excellent opportunities for commensal transient searches. We carry out a commensal transient search in supernova and short gamma-ray burst fields using methodologies…

High Energy Astrophysical Phenomena · Physics 2025-06-24 S. I. Chastain , A. J. van der Horst , A. Horesh , A. Rowlinson , A. Andersson , R. Diretse , M. Vaccari , R. P. Fender , P. A. Woudt

Recent works have discovered two fast ($\approx 10$ ks) extragalactic X-ray transients in the Chandra Deep Field-South (CDF-S XT1 and XT2). These findings suggest that a large population of similar extragalactic transients might exist in…

High Energy Astrophysical Phenomena · Physics 2019-06-19 Guang Yang , W. N. Brandt , S. F. Zhu , F. E. Bauer , B. Luo , Y. Q. Xue , X. C. Zheng

The observation of Very High Energy gamma rays (VHE, E > 100 GeV) led us to the identification of extremely energetic processes and particle acceleration sites both within our Galaxy and beyond. We expect that VHE facilities, like CTA, will…

Instrumentation and Methods for Astrophysics · Physics 2021-09-08 G. La Mura , G. Chiaro , R. Conceiçao , A. De Angelis , M. Pimenta , B. Tomé

Transients powered by interaction with the circumstellar medium (CSM) are often observed in wavelengths other than optical, and multi-wavelength modelling can be important when inferring the properties of the explosion and CSM, or for…

High Energy Astrophysical Phenomena · Physics 2021-06-23 Daichi Tsuna , Kazumi Kashiyama , Toshikazu Shigeyama

We investigate the possibility of using future photometric and radio surveys to constrain the power spectrum of primordial fluctuations that is predicted by inflationary models with a violation of the slow-roll phase. We forecast…

Cosmology and Nongalactic Astrophysics · Physics 2018-04-17 Mario Ballardini , Fabio Finelli , Roy Maartens , Lauro Moscardini

One of the new frontiers of astronomical research is the exploration of time variability on the sky at different wavelengths and flux levels. We have carried out a pilot project using DPOSS data to study strong variables and transients, and…

The study of astronomical transients at high energies provides insights into some of the most extreme physical events in the universe; however, carrying out their detection and fast follow-up studies are limited by instrumental constraints.…

High Energy Astrophysical Phenomena · Physics 2026-01-28 Robbie Webbe , E. Quintin , N. A. Webb , Gabriele Ponti , Tong Bao , Chandreyee Maitra , Shifra Mandel , Samaresh Mondal

Temporal variability in flux and spectral shape is ubiquitous in the X-ray sky and carries crucial information about the nature and emission physics of the sources. The EPIC instrument on board the XMM-Newton observatory is the most…

Transient astronomical sources are typically powered by compact objects and usually signify highly explosive or dynamic events. While radio astronomy has an impressive record of obtaining high time resolution observations, usually it is…

Astrophysics · Physics 2009-11-10 S. D. Hyman , T. J. W. Lazio , N. E. Kassim , P. S. Ray , C. B. Markwardt , F. Yusef-Zadeh

In the last 15 years, 6 dedicated observation programs were carried out to monitor ~20 deg around the galactic center for transient activity above a few keV. Transient activity from low-mass X-ray binaries shows a strong preference for this…

Astrophysics · Physics 2007-05-23 Jean in 't Zand

The Catalina Real-time Transient Survey (CRTS) carried out a public survey for optical transients between 2007 and 2019, discovering more than 16,000 transient candidates. Here we present the spectra and highlight the results of the…

High Energy Astrophysical Phenomena · Physics 2025-10-27 A. J. Drake , S. G. Djorgovski , M. J. Graham , D. Stern , A. A. Mahabal , M. Catelan , J. L. Prieto , S. Larson

Planck, SPT and ACT surveys have clearly demonstrated that Cosmic Microwave Background (CMB) experiments, while optimised for cosmological measurements, have made important contributions to the field of extragalactic astrophysics in the…

Recently, there have been reports of six bright, dispersed bursts of coherent radio emission found in pulsar surveys with the Parkes Multi-beam Receiver. Not much is known about the progenitors of these bursts, but they are…

High Energy Astrophysical Phenomena · Physics 2013-09-10 T. E. Hassall , E. F. Keane , R. P. Fender

We are at the dawn of a new golden age for radio astronomy, with a new generation of facilities under construction and the global community focussed on the Square Kilometre Array as its goal for the next decade. These new facilities offer…

High Energy Astrophysical Phenomena · Physics 2011-12-13 R. P. Fender , M. E. Bell

The unique capabilities of Swift that make it ideal for discovery and follow-up of Gamma-Ray bursts also makes it the idea mission for discovery and monitoring of X-ray Transients in the Milky Way and the Large and Small Magellanic Clouds.…

High Energy Astrophysical Phenomena · Physics 2015-03-27 Jamie A. Kennea

The frequency spectrum of the cosmic microwave background (CMB) is a relatively untapped source of data which can allow us to peer beyond the surface of last scattering. Small deviations away from a perfect blackbody shape will encode…

Cosmology and Nongalactic Astrophysics · Physics 2024-06-21 Bryce Cyr

The time domain of the sky has been only sparsely explored. Nevertheless, recent discoveries from limited surveys and serendipitous discoveries indicate that there is much to be found on timescales from nanoseconds to years and at…

Instrumentation and Methods for Astrophysics · Physics 2016-09-08 J. Lazio , J. S. Bloom , G. C. Bower , J. Cordes , S. Croft , S. Hyman , C. Law , M. McLaughlin