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HE1: Extragalactic Transients

Session Organisers: 

Carole Mundell (Liverpool John Moores University, UK), Stefanie Kommossa (Technical University Munich, Germany)


The time-variable sky is the next observational frontier and major new facilities, like LOFAR and LSST, are expected to revolutionise discovery of transient phenomena. Today, however, a growing number of discovery and rapid-response facilities with ever-improving capabilities are already opening this time domain.

Extragalactic transients trace physics under extreme conditions: the strongest gravitational and magnetic fields, most extreme tidal forces and explosive energy releases. They provide tight constraints on our understanding of accretion physics, jet formation, and ultimately may deliver long-elusive gravitational waves. Their huge peak luminosities allow us to detect them out to large cosmological distances and back to the earliest cosmic times.

The goal of this session is to bring together leading UK and German observers and theorists across the fields of gamma-ray bursts (GRBs), supernovae (SNe), stellar tidal disruption flares (TDFs) and Active Galactic Nuclei (AGN) variability, triggering and fuelling, to exploit the strong synergies and links between them, both in the underlying physical processes and their survey-search/follow-up techniques and strategies. The link between this broad-reaching set of time-variable phenomena represents a cutting-edge interface between complementary communities and their techniques and holds much promise for progress; e.g. recent Swift satellite discoveries of distant galactic centre flares.

Abstracts are invited presenting new results in any of these astrophysical areas - observation, theory and instrumentation/technological capability - and particularly at the interface between them. We also encourage abstracts on multi-messenger campaigns such as neutrino and gravitational waves combined with EM signatures.


This is a complete listing of all 18 entries

Poster Session A
Long-term X-ray variability of Swift J1644+57  Roberto Soria
A black hole transient, and other X-ray binaries in Cen A  Mark Burke
CLASP (Create Lightcurves with Alignment, Subtraction and Photometry)  Joe Lyman
A Stacked Analysis of Cluster-centre AGN with Fermi-LAT Data  Kate Dutson

Wednesday 28th 10:00-11:15
10:00 XMM-Newton observations of transients  Norbert Schartel
10:15 Searches for gravitational wave signals associated to gamma-ray bursts  Stephen Fairhurst
10:30 Early Time GRB Optical Afterglow Evolution  Richard Harrison
10:40 A new intrinsic correlation between Gamma-ray Burst optical/UV afterglow brightness and decay rate  Samantha Oates
10:50 On the nature of the ``hostless  Rachel Tunnicliffe
11:00 What I did with that sparker  E. F. Keane
11:10 2 Minute Poster Summaries for HE1  HE1 Poster Summaries

Wednesday 28th 11:45-13:00
11:45 The Flare Activity of Sagittarius A* at the Center of the Milky Way  Andreas Eckart
12:00 Relativistically beamed tidal disruption events  Andrew Levan
12:15 Extragalactic Transients with MAGIC: A MWL view of AGNs, GRBs and TDFs  Ulisses Barres de Almeida
12:25 Variability analysis of X-ray point sources in NGC 4472  Tana Joseph
12:35 Breaks and Curvature in the GeV Spectrum of Bright FSRQs  Jonathan Harris
12:45 Ultraviolet and Optical Flare from the Tidal Disruption of a Helium-Rich Stellar Core  Andy Lawrence
12:55 2-Minute poster summaries for HE1  HE1 Poster Summaries