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View article: Sub-Threshold Fermi-LAT Sources in the Vicinity of KM3-230312A
Sub-Threshold Fermi-LAT Sources in the Vicinity of KM3-230312A Open
The KM3NeT collaboration has recently reported the detection of an extraordinary ultra-high-energy neutrino event with an energy of 220 PeV. Ultrahigh energy neutrinos and gamma-rays are co-produced in ultrahigh energy cosmic-ray interacti…
View article: Combined dark matter search towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS
Combined dark matter search towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS Open
Dwarf spheroidal galaxies (dSphs) are excellent targets for indirect dark matter (DM) searches using gamma-ray telescopes because they are thought to have high DM content and a low astrophysical background. The sensitivity of these searche…
View article: Puzzling Variation of Gamma Rays from the Sun over the Solar Cycle Revealed with Fermi-LAT
Puzzling Variation of Gamma Rays from the Sun over the Solar Cycle Revealed with Fermi-LAT Open
The steady-state gamma-ray emission from the Sun is thought to consist of two emission components due to interactions with Galactic cosmic rays: (1) a hadronic disk component, and (2) a leptonic extended component peaking at the solar edge…
View article: A Systematic Search for MeV–GeV Pulsar Wind Nebulae without Gamma-Ray Detected Pulsars
A Systematic Search for MeV–GeV Pulsar Wind Nebulae without Gamma-Ray Detected Pulsars Open
An increasing number of pulsar wind nebulae (PWNe) are being identified in the TeV band by ground-based Imaging Air Cherenkov Telescopes such that they constitute the dominant source class of Galactic TeV emitters. However, MeV–GeV PWN cou…
View article: Background Measurements and Simulations of the ComPair Balloon Flight
Background Measurements and Simulations of the ComPair Balloon Flight Open
ComPair, a prototype of the All-sky Medium Energy Gamma-ray Observatory (AMEGO), completed a short-duration high-altitude balloon campaign on 27 August 2023 from Fort Sumner, New Mexico, USA. The goal of the balloon flight was to demonstra…
View article: GRB 221009A: The B.O.A.T. Burst that Shines in Gamma Rays
GRB 221009A: The B.O.A.T. Burst that Shines in Gamma Rays Open
We present a complete analysis of Fermi Large Area Telescope (LAT) data of GRB 221009A, the brightest gamma-ray burst (GRB) ever detected. The burst emission above 30 MeV detected by the LAT preceded, by 1 s, the low-energy (<10 MeV) pulse…
View article: Periodic Gamma-Ray Modulation of the Blazar PG 1553+113 Confirmed by Fermi-LAT and Multiwavelength Observations
Periodic Gamma-Ray Modulation of the Blazar PG 1553+113 Confirmed by Fermi-LAT and Multiwavelength Observations Open
A 2.1 yr periodic oscillation of the gamma-ray flux from the blazar PG 1553+113 has previously been tentatively identified in ∼7 yr of data from the Fermi Large Area Telescope. After 15 yr of Fermi sky-survey observations, doubling the tot…
View article: Search for Extended GeV Sources in the Inner Galactic Plane
Search for Extended GeV Sources in the Inner Galactic Plane Open
The recent detection of extended $γ$-ray emission around middle-aged pulsars is interpreted as inverse-Compton scattering of ambient photons by electron-positron pairs escaping the pulsar wind nebula, which are confined near the system by …
View article: Parkes Radio and NuSTAR X-Ray Observations of the Composite Supernova Remnant B0453–685 in the Large Magellanic Cloud
Parkes Radio and NuSTAR X-Ray Observations of the Composite Supernova Remnant B0453–685 in the Large Magellanic Cloud Open
Gamma-ray emission is observed coincident in position to the evolved, composite supernova remnant (SNR) B0453–685. Prior multiwavelength investigations of the region indicate that the pulsar wind nebula (PWN) within the SNR is the most lik…
View article: Parkes Radio and NuSTAR X-ray Observations of the Composite Supernova Remnant B0453-685 in the Large Magellanic Cloud
Parkes Radio and NuSTAR X-ray Observations of the Composite Supernova Remnant B0453-685 in the Large Magellanic Cloud Open
Gamma-ray emission is observed coincident in position to the evolved, composite supernova remnant (SNR) B0453-685. Prior multi-wavelength investigations of the region indicate that the pulsar wind nebula (PWN) within the SNR is the most li…
View article: The 2023 balloon flight of the ComPair instrument
The 2023 balloon flight of the ComPair instrument Open
The ComPair balloon instrument is a prototype gamma-ray telescope that aims\nto further develop technology for observing the gamma-ray sky in the MeV\nregime. ComPair combines four detector subsystems to enable parallel Compton\nscattering…
View article: Results from the CsI calorimeter onboard the 2023 ComPair balloon flight
Results from the CsI calorimeter onboard the 2023 ComPair balloon flight Open
The ComPair gamma-ray telescope is a technology demonstrator for a future gamma-ray telescope called the All-sky Medium Energy Gamma-ray Observatory (AMEGO). The instrument is composed of four subsystems, a double-sided silicon strip detec…
View article: Results from the CsI Calorimeter onboard the 2023 ComPair Balloon Flight
Results from the CsI Calorimeter onboard the 2023 ComPair Balloon Flight Open
The ComPair gamma-ray telescope is a technology demonstrator for a future gamma-ray telescope called the All-sky Medium Energy Gamma-ray Observatory (AMEGO). The instrument is composed of four subsystems, a double-sided silicon strip detec…
View article: The Compton Pair telescope: A prototype for a next-generation MeV gamma-ray observatory
The Compton Pair telescope: A prototype for a next-generation MeV gamma-ray observatory Open
The Compton Pair (ComPair) telescope is a prototype that aims to develop the necessary technologies for future medium energy gamma-ray missions and to design, build, and test the prototype in a gamma-ray beam and balloon flight. The ComPai…
View article: Fermi-GBM Discovery of GRB 221009A: An Extraordinarily Bright GRB from Onset to Afterglow
Fermi-GBM Discovery of GRB 221009A: An Extraordinarily Bright GRB from Onset to Afterglow Open
We report the discovery of GRB 221009A, the highest flux gamma-ray burst (GRB) ever observed by the Fermi Gamma-ray Burst Monitor (Fermi-GBM). This GRB has continuous prompt emission lasting more than 600 s, which smoothly transitions to a…
View article: The Fermi-LAT Lightcurve Repository*
The Fermi-LAT Lightcurve Repository* Open
The Fermi Large Area Telescope (LAT) lightcurve repository (LCR) is a publicly available, continually updated library of gamma-ray lightcurves of variable Fermi-LAT sources generated over multiple timescales. The Fermi-LAT LCR aims to prov…
View article: Development of the ComPair gamma-ray telescope prototype
Development of the ComPair gamma-ray telescope prototype Open
There is a growing interest in the science uniquely enabled by observations in the MeV range, particularly in light of multi-messenger astrophysics. The Compton Pair (ComPair) telescope, a prototype of the AMEGO Probe-class concept, consis…
View article: Search for New Cosmic-Ray Acceleration Sites within the 4FGL Catalog Galactic Plane Sources
Search for New Cosmic-Ray Acceleration Sites within the 4FGL Catalog Galactic Plane Sources Open
Cosmic rays are mostly composed of protons accelerated to relativistic speeds. When those protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma-rays. This offers a compelling way to identify th…
View article: Incremental Fermi Large Area Telescope Fourth Source Catalog
Incremental Fermi Large Area Telescope Fourth Source Catalog Open
We present an incremental version (4FGL-DR3, for Data Release 3) of the fourth Fermi Large Area Telescope (LAT) catalog of γ -ray sources. Based on the first 12 years of science data in the energy range from 50 MeV to 1 TeV, it contains 66…
View article: Fermi Large Area Telescope Performance after 10 Years of Operation
Fermi Large Area Telescope Performance after 10 Years of Operation Open
The Large Area Telescope (LAT), the primary instrument for the Fermi Gamma-ray Space Telescope (Fermi) mission, is an imaging, wide field-of-view, high-energy gamma-ray telescope, covering the energy range from 30 MeV to more than 300 GeV.…
View article: The POEMMA (Probe of Extreme Multi-Messenger Astrophysics) observatory
The POEMMA (Probe of Extreme Multi-Messenger Astrophysics) observatory Open
The Probe Of Extreme Multi-Messenger Astrophysics (POEMMA) is designed to accurately observe ultra-high-energy cosmic rays (UHECRs) and cosmic neutrinos from space with sensitivity over the full celestial sky. POEMMA will observe the air f…
View article: Cost-effectiveness of ribociclib plus endocrine therapy versus placebo plus endocrine therapy in HR-positive, HER2-negative breast cancer
Cost-effectiveness of ribociclib plus endocrine therapy versus placebo plus endocrine therapy in HR-positive, HER2-negative breast cancer Open
BACKGROUND: The 2015 American Society of Clinical Oncology guidelines recommend first-line treatment of hormone receptor (HR)-positive breast cancer with endocrine therapy plus or minus palbociclib, a selective cyclin-dependent kinase (CDK…
View article: Snowmass 2021 Letter of Interest: The Probe Of Multi-Messenger Astrophysics (POEMMA)
Snowmass 2021 Letter of Interest: The Probe Of Multi-Messenger Astrophysics (POEMMA) Open
The Probe Of Extreme Multi-Messenger Astrophysics (POEMMA) is designed to identify the sources of Ultra-High-Energy Cosmic Rays (UHECRs) and to observe cosmic neutrinos, both with full-sky coverage. Developed as a NASA Astrophysics Probe-c…
View article: The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope Open
The fourth catalog of active galactic nuclei (AGNs) detected by the Fermi Gamma-ray Space Telescope Large Area Telescope (4LAC) between 2008 August 4 and 2016 August 2 contains objects located at high Galactic latitudes ( ). It includes 85…
View article: Fermi Large Area Telescope Fourth Source Catalog
Fermi Large Area Telescope Fourth Source Catalog Open
We present the fourth Fermi Large Area Telescope catalog (4FGL) of γ -ray sources. Based on the first eight years of science data from the Fermi Gamma-ray Space Telescope mission in the energy range from 50 MeV to 1 TeV, it is the deepest …
View article: Bright Gamma-Ray Flares Observed in GRB 131108A
Bright Gamma-Ray Flares Observed in GRB 131108A Open
GRB 131108A is a bright long gamma-ray burst (GRB) detected by the Large Area Telescope and the Gamma-ray Burst Monitor on board the Fermi Gamma-ray Space Telescope . Dedicated temporal and spectral analyses reveal three γ -ray flares domi…
View article: Modular Position-sensitive High-resolution Calorimeter for Use in Space Gamma-ray Instruments Based on Virtual Frisch-grid CdZnTe Detectors
Modular Position-sensitive High-resolution Calorimeter for Use in Space Gamma-ray Instruments Based on Virtual Frisch-grid CdZnTe Detectors Open
We present a calorimeter concept based on 3-dimensional (3D) position-sensitive virtual Frisch-grid CdZnTe detectors. This calorimeter aims to measure photons with energies from ~100 keV to 20-50 MeV. The expected energy resolution at 662 …