D. Mata Sánchez
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View article: On the Distance to the Black Hole X-Ray Binary Swift J1727.8–1613
On the Distance to the Black Hole X-Ray Binary Swift J1727.8–1613 Open
We review the existing distance estimates to the black hole X-ray binary Swift J1727.8–1613, present new radio and near-UV spectra to update the distance constraints, and discuss the accuracies and caveats of the associated methodologies. …
View article: Unveiling the nature of the Einstein Probe transient EP 241021a
Unveiling the nature of the Einstein Probe transient EP 241021a Open
We present a multi-wavelength analysis of the fast X-ray transient EP 241021a, discovered by the Wide-field X-ray Telescope aboard the Einstein Probe satellite on 2024 October 21. The event was not detected in gamma-rays. Follow-up observa…
View article: Unveiling the nature of the Einstein Probe transient EP 241021a
Unveiling the nature of the Einstein Probe transient EP 241021a Open
We present a multi-wavelength analysis of the fast X-ray transient EP 241021a, discovered by the Wide-field X-ray Telescope aboard the \emph{Einstein Probe} satellite on 2024 October 21. The event was not detected in gamma-rays. Follow-up …
View article: EP250207b is not a collapsar fast X-ray transient. Is it due to a binary compact object merger?
EP250207b is not a collapsar fast X-ray transient. Is it due to a binary compact object merger? Open
Fast X-ray Transients (FXTs) are short-lived extra-galactic X-ray sources. Recent progress through multi-wavelength follow-up of Einstein Probe discovered FXTs has shown that several are related to collapsars, which can also produce γ-ray …
View article: A multiwavelength view of the outflowing short-period X-ray binary UW CrB
A multiwavelength view of the outflowing short-period X-ray binary UW CrB Open
Previous work detected transient ultraviolet outflow features for the short-period (P$_{\mathrm{orb}}{\approx }111$ min), low-mass X-ray binary (LMXB) UW CrB, suggesting the presence of a disc wind in the system. However, because of the tr…
View article: Characterising the short-orbital period X-ray transient <i>Swift</i> J1910.2–0546
Characterising the short-orbital period X-ray transient <i>Swift</i> J1910.2–0546 Open
Context.Swift J1910.2–0546 (=MAXI J1910−057) is a Galactic X-ray transient discovered during a bright outburst in 2012. Its X-ray spectral and timing properties point to a black-hole accretor, yet the orbital period remains uncertain, and …
View article: The orbital period and inclination of the neutron star X-ray transient MAXI J1807+132
The orbital period and inclination of the neutron star X-ray transient MAXI J1807+132 Open
The neutron star X-ray transient MAXI J1807+132 underwent outbursts in 2017, 2019, and 2023. We conducted an R -band time series photometry campaign using the Isaac Newton Telescope during the 2022 quiescent state. We detected a periodic v…
View article: The orbital period and inclination of the neutron star X-ray transient MAXI J1807+132
The orbital period and inclination of the neutron star X-ray transient MAXI J1807+132 Open
The neutron star X-ray transient MAXI J1807+132 has undergone outbursts in 2017, 2019, and 2023. We conducted an $R$-band time series photometry campaign using the Isaac Newton Telescope during the 2022 quiescent state. We detected a perio…
View article: EP240801a/XRF 240801B: An X-Ray Flash Detected by the Einstein Probe and the Implications of Its Multiband Afterglow
EP240801a/XRF 240801B: An X-Ray Flash Detected by the Einstein Probe and the Implications of Its Multiband Afterglow Open
We present multiband observations and analysis of EP240801a, a low-energy, extremely soft gamma-ray burst (GRB) discovered on 2024 August 1 by the Einstein Probe (EP) satellite with a weak contemporaneous signal also detected by the Fermi …
View article: Analysis of optical spectroscopy and photometry of the type I X-ray bursting system UW CrB
Analysis of optical spectroscopy and photometry of the type I X-ray bursting system UW CrB Open
UW Coronae Borealis (UW CrB) is a low mass X-ray binary that shows both Type 1 X-ray and optical bursts, which typically last for 20 s. The system has a binary period of close to 2 hours and is thought to have a relatively high inclination…
View article: Analysis of optical spectroscopy and photometry of the type I X-ray bursting system UW CrB
Analysis of optical spectroscopy and photometry of the type I X-ray bursting system UW CrB Open
UW Coronae Borealis (UW CrB) is a low mass X-ray binary that shows both Type 1 X-ray and optical bursts, which typically last for 20 s. The system has a binary period of close to 2 hours and is thought to have a relatively high inclination…
View article: The Einstein Probe Transient EP240414a: Linking Fast X-Ray Transients, Gamma-Ray Bursts, and Luminous Fast Blue Optical Transients
The Einstein Probe Transient EP240414a: Linking Fast X-Ray Transients, Gamma-Ray Bursts, and Luminous Fast Blue Optical Transients Open
Detections of fast X-ray transients (FXTs) have accrued over the last few decades. However, their origin has remained mysterious. Rapid progress is now being made thanks to timely discoveries and localizations with the Einstein Probe missi…
View article: Soft X-ray prompt emission from the high-redshift gamma-ray burst EP240315a
Soft X-ray prompt emission from the high-redshift gamma-ray burst EP240315a Open
View article: State-dependent signatures of jets and winds in the optical and infrared spectrum of the black hole transient GX 339$-$4
State-dependent signatures of jets and winds in the optical and infrared spectrum of the black hole transient GX 339$-$4 Open
GX 339$-$4 is one of the prototypical black hole X-ray transients, exhibiting recurrent outbursts that allow detailed studies of black hole accretion and ejection phenomena. In this work we present four epochs of optical and near-infrared …
View article: State-dependent signatures of jets and winds in the optical and infrared spectrum of the black hole transient GX 339–4
State-dependent signatures of jets and winds in the optical and infrared spectrum of the black hole transient GX 339–4 Open
GX 339–4 is one of the prototypical black hole X-ray transients, exhibiting recurrent outbursts that allow detailed studies of black hole accretion and ejection phenomena. In this work we present four epochs of optical and near-infrared sp…
View article: Dynamical confirmation of a black hole in the X-ray transient Swift J1727.8−1613
Dynamical confirmation of a black hole in the X-ray transient Swift J1727.8−1613 Open
The X-ray transient Swift J1727.8−1613 ended its 10-month discovery outburst in June of 2024, when it reached an optical brightness comparable to pre-discovery magnitudes. With the aim of performing a dynamical study, we launched an optica…
View article: The Orbit and Companion of PSR J1622-0315: Variable Asymmetry and a Massive Neutron Star
The Orbit and Companion of PSR J1622-0315: Variable Asymmetry and a Massive Neutron Star Open
The companion to PSR J1622-0315, one of the most compact known redback millisecond pulsars, shows extremely low irradiation despite its short orbital period. We model this system to determine the binary parameters, combining optical observ…
View article: Dynamical confirmation of a black hole in the X-ray transient Swift J1727.8-1613
Dynamical confirmation of a black hole in the X-ray transient Swift J1727.8-1613 Open
The X-ray transient Swift J1727.8-1613 ended its 10-month discovery outburst on June of 2024, when it reached an optical brightness comparable to pre-discovery magnitudes. With the aim of performing a dynamical study, we launched an optica…
View article: <i>Kilonova Seekers</i>: the GOTO project for real-time citizen science in time-domain astrophysics
<i>Kilonova Seekers</i>: the GOTO project for real-time citizen science in time-domain astrophysics Open
Time-domain astrophysics continues to grow rapidly, with the inception of new surveys drastically increasing data volumes. Democratized, distributed approaches to training sets for machine learning classifiers are crucial to make the most …
View article: $\textit{Kilonova Seekers}$: the GOTO project for real-time citizen science in time-domain astrophysics
$\textit{Kilonova Seekers}$: the GOTO project for real-time citizen science in time-domain astrophysics Open
Time-domain astrophysics continues to grow rapidly, with the inception of new surveys drastically increasing data volumes. Democratised, distributed approaches to training sets for machine learning classifiers are crucial to make the most …
View article: The fast X-ray transient EP240315a: a z ~ 5 gamma-ray burst in a Lyman continuum leaking galaxy
The fast X-ray transient EP240315a: a z ~ 5 gamma-ray burst in a Lyman continuum leaking galaxy Open
The nature of the minute-to-hour long Fast X-ray Transients (FXTs) localised by telescopes such as Chandra, Swift, and XMM-Newton remains mysterious, with numerous models suggested for the events. Here, we report multi-wavelength observati…
View article: Soft X-ray prompt emission from a high-redshift gamma-ray burst EP240315a
Soft X-ray prompt emission from a high-redshift gamma-ray burst EP240315a Open
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 th…
View article: Soft-state optical spectroscopy of the black hole MAXI J1305-704
Soft-state optical spectroscopy of the black hole MAXI J1305-704 Open
The X-ray dipper MAXI J1305-704 is a dynamically confirmed black hole (BH) X-ray binary discovered a decade ago. While its only outburst has been studied in detail in X-rays, follow-up at other wavelengths has been scarce. We report here t…
View article: The omnipresent flux-dependent optical dips of the black hole transient Swift J1357.2−0933
The omnipresent flux-dependent optical dips of the black hole transient Swift J1357.2−0933 Open
Swift J1357.2-0933 is a black hole transient that is of particular interest due to the optical recurrent dips found during its first two outbursts (in 2011 and 2017), which lack an obvious X-ray equivalent. We present a study based on fast…
View article: Evidence for inflows and outflows in the nearby black hole transient Swift J1727.8−162
Evidence for inflows and outflows in the nearby black hole transient Swift J1727.8−162 Open
We present 20 epochs of optical spectroscopy obtained with the GTC-10.4m telescope across the bright discovery outburst of the black hole candidate Swift J1727.8−162. The spectra cover the main accretion states and are characterised by the…
View article: Evidence for inflows and outflows in the nearby black hole transient Swift J1727.8-162
Evidence for inflows and outflows in the nearby black hole transient Swift J1727.8-162 Open
We present 20 epochs of optical spectroscopy obtained with the GTC-10.4m telescope across the bright discovery outburst of the black hole candidate Swift J1727.8-162. The spectra cover the main accretion states and are characterised by the…
View article: GRB 230911A: The First Discovery of a Fermi GRB Optical Counterpart with the Gravitational-wave Optical Transient Observer (GOTO)
GRB 230911A: The First Discovery of a Fermi GRB Optical Counterpart with the Gravitational-wave Optical Transient Observer (GOTO) Open
We report on the detection of candidate optical counterpart GOTO23akf/AT2023shv to the GRB 230911A with the Gravitational-wave Optical Transient Observer (GOTO) instruments located at La Palma, Canary Islands, and Siding Spring Observatory…
View article: XMM-<i>Newton</i>-discovered Fast X-ray Transients: host galaxies and limits on contemporaneous detections of optical counterparts
XMM-<i>Newton</i>-discovered Fast X-ray Transients: host galaxies and limits on contemporaneous detections of optical counterparts Open
Extragalactic fast X-ray transients (FXTs) are a class of soft (0.3–10 keV) X-ray transients lasting a few hundred seconds to several hours. Several progenitor mechanisms have been suggested to produce FXTs, including supernova shock break…
View article: XMM-Newton-discovered Fast X-ray Transients: Host galaxies and limits on contemporaneous detections of optical counterparts
XMM-Newton-discovered Fast X-ray Transients: Host galaxies and limits on contemporaneous detections of optical counterparts Open
Extragalactic fast X-ray transients (FXTs) are a class of soft (0.3-10 keV) X-ray transients lasting a few hundred seconds to several hours. Several progenitor mechanisms have been suggested to produce FXTs, including supernova shock break…
View article: Fast infrared winds during the radio-loud and X-ray obscured stages of the black hole transient GRS 1915+105
Fast infrared winds during the radio-loud and X-ray obscured stages of the black hole transient GRS 1915+105 Open
The black hole transient GRS 1915+105 entered a new phase of activity in 2018, generally characterised by low X-ray and radio fluxes. This phase has only been interrupted by episodes of strong and variable radio emission, where high levels…