C. G. Mundell
A5025776045- Gamma-ray bursts and supernovae
- SAS software applications and methods
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Pulsars and Gravitational Waves Research
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Solar and Space Plasma Dynamics
- Adaptive optics and wavefront sensing
- History and Developments in Astronomy
- Spectroscopy and Laser Applications
- Geophysics and Gravity Measurements
- Neutrino Physics Research
- Planetary Science and Exploration
- Scientific Research and Discoveries
- Space exploration and regulation
- Advanced X-ray Imaging Techniques
University of Bath
2015-2024
European Space Astronomy Centre
2023-2024
European Space Agency
2024
Authorised Association Consortium
2021
Monash University
2019
Liverpool John Moores University
2008-2018
University of Glasgow
1996-2018
City of Glasgow College
2018
Kazan Federal University
2018
University of Ferrara
2018
XIPE, the X-ray Imaging Polarimetry Explorer, is a mission dedicated to Astronomy. At time of writing XIPE in competitive phase A as fourth medium size ESA (M4). It promises reopen polarimetry window high energy Astrophysics after more than 4 decades thanks detector that efficiently exploits photoelectric effect and optics with large effective area. uniqueness time-spectrally-spatially- resolved breakthrough astrophysics fundamental physics. Indeed payload consists three Gas Pixel Detectors...
Long-duration Gamma-Ray Bursts (GRBs) are an extremely rare outcome of the collapse massive stars, and typically found in distant Universe. Because its intrinsic luminosity ($L\sim 3 \times 10^{53}$ erg s$^{-1}$) relative proximity ($z=0.34$), GRB 130427A was a unique event that reached highest fluence observed gamma-ray band. Here we present comprehensive multiwavelength view with Swift, 2-m Liverpool Faulkes telescopes by other ground-based facilities, highlighting evolution burst emission...
Context. Since July 2014, the Gaia mission has been engaged in a high-spatial-resolution, time-resolved, precise, accurate astrometric, and photometric survey of entire sky. Aims. We present Science Alerts project, which operation since 1 June 2016. describe system developed to enable discovery publication transient events as seen by . Methods. outline data handling, timings, performances, we detection algorithms filtering procedures needed manage high false alarm rate. identify two classes...
We present the first data release of high-resolution ($\leq0.2$ arcsec) 1.5-GHz radio images 103 nearby galaxies from Palomar sample, observed with eMERLIN array, as part LeMMINGs survey. This sample includes which are active (LINER and Seyfert) quiescent (HII Absorption line galaxies, ALG), reclassified based upon revised emission-line diagrams. detect emission $\gtrsim$ 0.2 mJy for 47/103 (22/34 LINERS, 4/4 Seyferts, 16/51 HII 5/14 ALGs) sizes typically $\lesssim$100 pc. identify core...
The dissipation process of GRB prompt emission is still unknown. Study temporal variability may provide a unique way to discriminate the imprint inner engine activity from geometry and propagation related effects. We define minimum timescale (MVT) as shortest duration individual pulses that shape light curve for sample GRBs test correlations with peak luminosity, Lorentz factor, jet opening angle. compare these predictions recent numerical simulations relativistic structured -- possibly...
We report sub-arcsecond X-ray imaging spectroscopy of M87 and the core Virgo cluster with Chandra Observatory. The morphology shows structure on arcsecond (~100 pc) to ten arcminute (~50 kpc) scales, most prominent feature being an "arc" running from east, across central region off southwest. A ridge in radio map, ending "ear"-shaped structure, follows arc east. Depressions surface brightness correspond inner lobes there is no evidence shock-heated gas surrounding them. There are also at...
To examine the role of host galaxy structure in fueling nuclear activity, we estimated gas flow rates from several kpc down to inner few 10 pc for seven nearby spiral galaxies, selected NUGA sample (NUclei GAlaxies). We calculated gravitational torques near-IR images and determined in/out-flow as a function radius location within galactic disks, based on high angular resolution interferometric observations molecular (CO using PdBI) atomic (HI VLA) gas. The results are compared with kinematic...
We present ground-based and HST optical infrared observations of XRF 100316D / SN 2010bh. It is seen that the light curves 2010bh evolve at a faster rate than archetype GRB-SN 1998bw, but similar to 2006aj, supernova was spectroscopically linked with 060218, non-GRB associated type Ic 1994I. estimate rest-frame extinction this event from our data be E(B-V)=0.18 +/- 0.08 mag. find V-band absolute magnitude M_{V}=-18.62 0.08, which faintest peak observed to-date for spectroscopically-confirmed...
We present a broadband study of gamma-ray burst (GRB) 091024A within the context other ultra-long-duration GRBs. An unusually long detected by Konus-Wind, Swift, and Fermi, GRB has prompt emission episodes covering ~1300 s, accompanied bright highly structured optical captured various rapid-response facilities, including 2-m autonomous robotic Faulkes North Liverpool Telescopes, KAIT, S-LOTIS, SRO. also observed with 8- 10-m class telescopes determine redshift to be z = 1.0924 \pm 0.0004....
GRB 130427A occurred in a relatively nearby galaxy; its prompt emission had the largest fluence ever recorded. The afterglow of was bright enough for Nuclear Spectroscopic Telescope ARray (NuSTAR) to observe it 3-79 keV energy range long after (~1.5 and 5 days). This range, where observations were previously not possible, bridges an important spectral gap. Combined with Swift, Fermi ground-based optical data, NuSTAR unambiguously establish single component from multi-GeV energies day event,...
We present optical and near-infrared (NIR) photometry for three gamma-ray burst supernovae (GRB-SNe): GRB 120729A, 130215A / SN 2013ez 130831A 2013fu. In the case of 2013ez, we also spectroscopy at t-t0=16.1 d, which covers rest-frame 3000-6250 Angstroms. Based on Fe II (5169) Si (II) (6355), our spectrum indicates an unusually low expansion velocity 4000-6350 km/s, lowest ever measured a GRB-SN. Additionally, determined brightness shape each accompanying relative to template supernova (SN...
We present the second multi-frequency radio detection of a reverse shock in $\gamma$-ray burst. By combining our extensive observations Fermi-LAT GRB 160509A at $z = 1.17$ up to $20$ days after burst with Swift X-ray and ground-based optical near-infrared data, we show that afterglow emission comprises distinct forward contributions: dominates band $\lesssim10~$days, while X-ray, optical, bands. Through multi-wavelength modeling, determine circumburst density $n_0\approx10^{-3}~$cm$^{-3}$,...
Abstract We present Atacama Large Millimeter/submillimeter Array 97.5 GHz total intensity and linear polarization observations of the mm-band afterglow GRB 190114C spanning 2.2–5.2 hr after burst. detect at ≈5 σ level, decreasing from Π = (0.87 ± 0.13)% to (0.60 0.19)%, evolving in position angle (10 5)° (−44 12)° during course observations. This represents first detection measurement temporal evolution polarized radio/millimeter emission a γ -ray show that optical X-ray between 0.03 days...
Sensitive high angular and linear resolution radio images of the 240-pc jet in NGC4151, imaged at resolutions 0.3 to 2.6 pc using VLBA phased VLA 21 cm, are presented reveal for first time a faint, highly collimated (diameter <1.4 pc) underlying discrete components, seen lower MERLIN images, that appear be shock-like features associated with changes direction as interacts small gas clouds within central 100 galaxy. In addition, 21-cm spectral line imaging neutral hydrogen nuclear region...
We investigate the properties of two-dimensional distribution and kinematics ionized gas stars in central kiloparsec a matched sample nearby active (Seyfert) inactive galaxies, using SAURON integral field unit on William Herschel Telescope. The distributions show range low-excitation regions, such as star formation rings Seyfert high-excitation regions related to photoionization by galactic nucleus (AGN). stellar all galaxies regular rotation patterns typical disc-like systems, with...
Swift triggered on a precursor to the main burst of GRB 061121 (z=1.314), allowing observations be made from optical gamma-ray bands. Many other telescopes, including Konus-Wind, XMM-Newton, ROTSE and Faulkes Telescope North, also observed burst. The gamma-ray, X-ray UV/optical emission all showed peak ~75s after trigger, although afterglow components appear early - before, or during, peak. Spectral evolution was seen throughout burst, with prompt showing clear positive correlation between...
We present Sauron 2D spectrography of the central 1.5 kpc nearby Sey2 galaxy NGC1068, encompassing well-known NIR inner bar. have successively disentangled respective contributions ionized gas and stars, thus deriving their distribution kinematics. The [OIII] Hbeta emission lines exhibit very different spatial kinematics, latter following spiral arms with clumps associated star formation. Strong inwards streaming motions are observed in both stellar kinematics also clear signatures a...
We present a multiwavelength analysis of Swift GRB 061007. The 2 m robotic Faulkes Telescope South began observing 137 s after the onset γ-ray emission, when optical counterpart was already decaying from R ~ 10.3 mag, and continued for next 5.5 hr. These observations begin during final flare continue through beyond long, soft tail emission whose flux shows an underlying simple power-law decay identical to that seen at X-ray wavelengths, with temporal slope α 1.7 (F ∝ t-α). This remarkably in...
We present a detailed study of the prompt and afterglow emission from Swift GRB 061126 using BAT, XRT, UVOT data multi-color optical imaging ten ground-based telescopes. was long burst (T_90=191 s) with four overlapping peaks in its gamma-ray light curve. The X-ray afterglow, observed 26 min to 20 days after burst, shows simple power-law decay alpha_X=1.290 \pm 0.008. Optical observations presented here cover time range 258 s (Faulkes Telescope North) 15 (Gemini burst; rate steep-to-shallow...