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The Swift X-ray Telescope
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The Swift Gamma-Ray Explorer is designed to make prompt multiwavelength observations of Gamma-Ray Bursts (GRBs) and GRB afterglows. The X-ray Telescope (XRT) enables Swift to determine GRB positions with a few arcseconds accuracy within 100 seconds of the burst onset. The XRT utilizes a mirror set built for JET-X and an XMM/EPIC MOS CCD detector to provide a sensitive broad-band (0.2-10 keV) X-ray imager with effective area of > 120 cm^2 at 1.5 keV, field of view of 23.6 x 23.6 arcminutes, and angular resolution of 18 arcseconds (HPD). The detection sensitivity is 2x10^-14 erg cm^-2 s^-1 in 10^4 seconds. The instrument is designed to provide automated source detection and position reporting within 5 seconds of target acquisition. It can also measure the redshifts of GRBs with Fe line emission or other spectral features. The XRT operates in an auto-exposure mode, adjusting the CCD readout mode automatically to optimize the science return for each frame as the source intensity fades. The XRT will measure spectra and lightcurves of the GRB afterglow beginning about a minute after the burst and will follow each burst for days or weeks.
Forward citations
Cited by 30 Pith papers
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Spectropolarimetric detection of baryonic mass loading in a transient relativistic jet: application to the black hole X-ray binary Swift J1727.8$-$1613
Transient Faraday-complex spectropolarimetric structure detected during radio flaring of Swift J1727 implies internal Faraday rotation from electron-proton jet plasma with rotating mass ~10^21 g, a small fraction of a...
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Spatially resolved optical and mid-infrared spectroscopy of SDSS1335+0728: implications for the origin of the Ansky event
Spatially resolved spectroscopy shows SDSS1335+0728 has a three-zone ionisation structure, optically thin dust, and sustained low-level nuclear activity for at least 1500 years, implying the Ansky event is a faint tra...
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A catalogue of TeV pulsar environments
A homogenized catalogue of 128 TeV sources linked to 66 pulsars shows weak correlation between TeV luminosity and pulsar age, indicating environmental effects dominate evolution.
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EP260321a/SN 2026gzf: The Faintest Shock Breakout Associated with a Broad-Lined Supernova
EP260321a is the faintest observed shock breakout tied to a broad-lined Type Ic supernova, interpreted as a choked weak outflow from a stripped star.
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SN 2023uqf: An Interacting Supernova Coincident with a High-Energy Neutrino
SN 2023uqf, a rare interacting Type Ibn supernova found coincident with neutrino IC231004A, is the first observational evidence that interacting supernovae are hadronic accelerators.
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The most extreme high-z radio quasars in the eRASS:1 X-ray survey
The team confirmed 39 new high-redshift radio quasars and found that the number of X-ray-selected blazars at z>4 grows with redshift faster than a constant X-ray/radio ratio model, in broad agreement with the IC/CMB model.
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Outflows in super-Eddington quasars drive clumpy circumgalactic medium and extended H$\alpha$ nebulae at $z \gtrsim 6$
In z≈6 quasar simulations, super-Eddington black-hole growth clears escape channels, ejects cold clumps that raise neutral-hydrogen covering, and powers extended Hα nebulae that shrink when the quasar is obscured.
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Searching for $\gamma$-ray emission from a bona fide Compact Symmetric Object sample: a $\gamma$-ray signal near GB6 J0906+4124
No bona fide CSO in a 73-source sample is firmly detected in 16 years of Fermi-LAT data; a ~4σ signal near GB6 J0906+4124 is a plausible but unconfirmed counterpart.
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Simultaneous radio, optical and X-ray monitoring of hard X-ray selected AGN: a variability study
In 14 hard-X-ray-selected AGN monitored for two years, variability is strongest in X-rays and weakest in radio, and source variability explains only ~2-3% of the scatter in the Fundamental Plane.
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A Multiwavelength Study of a Long-Duration VHE Flare from BL Lacertae with VERITAS
BL Lacertae produced its first long-duration very-high-energy flare, detected for ~11 days and still visible ~40 days after the triggering GeV flare, with SED modeling favoring an SSC+external-Compton interpretation.
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Physically motivated AGN emissivity profiles and their effects on quasar microlensing signatures. 1. Multi-epoch accretion disc size inference
Interpreting composite disc-plus-BLR emission as a single compact disc systematically overestimates microlensing half-light radii, with the bias set mainly by the BLR flux fraction and the compact-disc emissivity shape.
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Search for continuous gravitational wave signals from luminous dark photon superradiance clouds with LVK O3 observations
A null search for continuous gravitational waves from 34 pulsar-like radio sources places upper limits on strain and disfavors dark photon masses around 10^-13 to 10^-12 eV with kinetic mixing 10^-9 to 10^-7, under sp...
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Exploring the multi-wavelength properties of the high energetic event ZTF20abbiixp/GRB 200524A: from prompt emission to afterglow
A multi-wavelength study of GRB 200524A reports a dense ISM environment with a high kinetic energy and a large magnetic-field energy fraction, inferred from forward plus reverse shock modeling.
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When will T Coronae Borealis next erupt as a nova? Constraints from recurrence, orbital phase, and accretion-state evolution
T CrB's next eruption is not uniquely predictable; conditional scenarios point to a possible 2026 December eruption if the current decline mimics 1946, or a lower limit near 2029 May if the recent high state left an a...
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Prospect for Detection of Strongly Lensed Multi-messenger Signals of Binary Neutron Star Mergers
Future CE+ET detectors may detect lensed BNS kilonovae at ~0.5/yr via pointed follow-up of known galaxy lenses, while lensed sGRBs and afterglows remain rare or undetectable with current-generation facilities.
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Multi-wavelength analysis of FSRQ B2 1348+30B: Constraints on the jet power
A 14.5-year multiwavelength analysis of the blazar B2 1348+30B yields jet power limits of about 2.6e46 to 4.2e48 erg/s, with the heavy-jet estimate far exceeding Eddington luminosity.
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Probing Heavy Axion-like Particles from Massive Stars with X-rays and Gamma Rays
Decay photons from heavy ALPs produced in Wolf-Rayet stars can be probed by INTEGRAL SPI down to gaγ ~ 4e-11 GeV^-1 for ma ~ 10-100 keV, modestly extending existing limits.
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Multi-Messenger Cosmology: A Route to Accurate Inference of Dark Energy Beyond CPL Parametrization from XG Detectors
A simulation forecast claims CE+ET bright standard sirens can measure dark energy EoS parameters with sigma(w0)=0.010, sigma(wa)=0.049, sigma(wb)=0.072, better than other planned probes.
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FACT -- Multi-wavelength analysis of more than 30 flares of Mrk 421
Mrk 421's X-ray and TeV flares are simultaneous, and its radio light curve can be reproduced as a delayed, smeared version of its GeV light curve.
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Observations of blazar PKS 2023-07 in flaring state with HESS and Fermi-LAT in 2016-2017 and constraints on an intrinsic cut-off
H.E.S.S. non-detections of the z=1.388 blazar PKS 2023-07 during flares, together with Fermi-LAT spectra, imply an intrinsic cutoff below about 35-128 GeV or absorption in the broad line region.
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Spectral-Regime Overlap and Transition-like Behavior in the Blazar Population from Multi-Instrument X-ray and TeV Observations
Multi-instrument observations reveal broad overlap in X-ray photon indices across blazar subclasses with intra-source spectral evolution supporting transition-like behavior.
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The compact neutron star in 4U 1746-37 revisited: Reassessing the mass and radius
Significant X-ray flux blocking in 4U 1746-37 allows the neutron star to have canonical mass and radius values of 1.59 solar masses and 13 km or 2.12 solar masses and 9.8 km.
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Tracking down the broadband polarimetric properties of PG 1553+113
New IXPE X-ray polarimetry and optical monitoring of PG 1553+113 reveal variable polarization and a large EVPA swing, supporting jet models with related but non-co-spatial X-ray and optical emission regions.
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Primordial Black Hole signatures from femtolensing and spectral fringe of Gamma Ray Bursts
Spectral fringes in a few GRB observations indicate possible femtolensing by primordial black holes, providing upper limits on their fractional abundance as dark matter.
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Road through Dark$\nu$ess: Probing dark matter-neutrino interactions using KM3-230213A
Using the 220 PeV event KM3-230213A, the authors set the highest-energy constraints to date on dark matter-neutrino scattering, and for energy-dependent cross sections they report some of the strongest existing limits.
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Blazars Jets and prospects for TeV-PeV neutrinos & gamma-rays through cosmic-ray interactions
A single-zone model with added proton-proton collisions suggests W Comae and 1ES 1959+650 need hadronic emission, and CTAO sensitivity forecasts show all four BL Lacs are detectable.
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The long-short GRB connection
Short gamma-ray bursts may be the merged descendants of long gamma-ray bursts formed in binary-driven hypernovae, with rates, redshifts, and host-galaxy offsets all consistent with this evolutionary link.
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Rapid Response Triggering for Radio Transients with the SKA Observatory
SKA-Low and SKA-Mid should implement automated rapid-response triggering on external and internal alerts to enable early radio observations of diverse transients.
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Hunting for extreme high-energy-peaked BL Lacs: Rare to find and difficult to classify
Follow-up observations reclassify 7 of 10 candidate ultra extreme high-energy-peaked BL Lacs as AGNs, with only 2 possibly compatible with MeV-peaked SEDs.
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GRB 250424A: A Case Study of Energy Injection with Multiwavelength Observations
GRB 250424A afterglow shows simultaneous shallow decay in X-ray and optical bands modeled as continuous energy injection (q≈0.34) into a forward shock in constant-density medium, with E_K,iso ≈5.5×10^52 erg and no cle...
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