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Here we report on the detailed analysis of the gamma-ray light curve of a luminous blazar PKS1510-089 observed in the GeV range with the Large Area Telescope (LAT) onboard the Fermi satellite during the period 2011 September -- December. By…

High Energy Astrophysical Phenomena · Physics 2015-06-12 S. Saito , L. Stawarz , Y. T. Tanaka , T. Takahashi , G. Madejski , F. D'Ammando

Fermi-LAT observations provide continuous and regularly-sampled measurements of gamma-ray photon flux for hundreds of blazars. Many of these light curves, spanning almost 15 years, have been thoroughly examined for periodicity in multiple…

High Energy Astrophysical Phenomena · Physics 2023-09-26 Polina Novikova , Ekaterina Shishkina , Dmitry Blinov

We present a multi-spacecraft analysis of the 2024 July 16 Long-Duration Gamma-Ray Flare (LDGRF) detected by the Large Area Telescope on the Fermi satellite. The measured >100 MeV $\gamma$-ray emission persisted for over seven hours after…

High Energy Astrophysical Phenomena · Physics 2026-01-14 Alessandro Bruno , Melissa Pesce-Rollins , Silvia Dalla , Nicola Omodei , Ian G. Richardson , James M. Ryan

Galaxy clusters could produce gamma-rays from inverse Compton scattering of cosmic ray electrons or hadronic interactions of cosmic ray protons with the intracluster medium. It is still an open question on whether gamma-ray emission ($>$…

High Energy Astrophysical Phenomena · Physics 2024-01-12 Siddhant Manna , Shantanu Desai

The Vela pulsar is the brightest persistent source in the GeV sky and thus is the traditional first target for new gamma-ray observatories. We report here on initial Fermi Large Area Telescope observations during verification phase pointed…

Astrophysics · Physics 2009-11-13 A. A. Abdo

The Large Area Telescope on board the Fermi Gamma-ray Space Telescope detected a strong gamma-ray flare on 2011 May 15 from a source identified as 4C 49.22, a flat spectrum radio quasar also known as S4 1150+49. This blazar, characterised…

Due to the low gamma-ray fluxes from pulsars above 50 GeV and the small collecting area of space-based telescopes, the gamma-ray emission discovered by the Fermi-LAT in $\sim$150 pulsars is largely unexplored at these energies. In this…

High Energy Astrophysical Phenomena · Physics 2015-05-20 A. McCann

The Fermi Large Area Telescope (LAT) has been scanning the gamma-ray sky since 2008. The number of pulsars detected by the LAT now exceeds 200, making them by far the largest class of Galactic gamma-ray emitters. I discuss some of the…

High Energy Astrophysical Phenomena · Physics 2019-08-21 Pablo M. Saz Parkinson

We present the fourth in a series of catalogs of gamma-ray bursts (GRBs) observed with Fermi's Gamma-Ray Burst Monitor (Fermi-GBM). It extends the six year catalog by four more years, now covering the ten year time period from trigger…

Since the launch of the Fermi satellite, BL Lacertae has been moderately active at gamma-rays and optical frequencies until May 2011, when the source started a series of strong flares. The exceptional optical sampling achieved by the…

High Energy Astrophysical Phenomena · Physics 2019-08-14 C. M. Raiteri , M. Villata , F. D'Ammando , V. M. Larionov , M. A. Gurwell , D. O. Mirzaqulov , P. S. Smith

Supernovae (SNe) exploding in a dense circumstellar medium (CSM) are hypothesized to accelerate cosmic rays in collisionless shocks and emit GeV gamma rays and TeV neutrinos on a time scale of several months. We perform the first systematic…

High Energy Astrophysical Phenomena · Physics 2015-07-13 M. Ackermann , I. Arcavi , L. Baldini , J. Ballet , G. Barbiellini , D. Bastieri , R. Bellazzini , E. Bissaldi , R. D. Blandford , R. Bonino , E. Bottacini , T. J. Brandt , J. Bregeon , P. Bruel , R. Buehler , S. Buson , G. A. Caliandro , R. A. Cameron , M. Caragiulo , P. A. Caraveo , E. Cavazzuti , C. Cecchi , E. Charles , A. Chekhtman , J. Chiang , G. Chiaro , S. Ciprini , R. Claus , J. Cohen-Tanugi , S. Cutini , F. D'Ammando , A. de Angelis , F. de Palma , R. Desiante , L. Di Venere , P. S. Drell , C. Favuzzi , S. J. Fegan , A. Franckowiak , S. Funk , P. Fusco , A. Gal-Yam , F. Gargano , D. Gasparrini , N. Giglietto , F. Giordano , M. Giroletti , T. Glanzman , G. Godfrey , I. A. Grenier , J. E. Grove , S. Guiriec , A. K. Harding , K. Hayashi , J. W. Hewitt , A. B. Hill , D. Horan , T. Jogler , G. Jóhannesson , D. Kocevski , M. Kuss , S. Larsson , J. Lashner , L. Latronico , J. Li , L. Li , F. Longo , F. Loparco , M. N. Lovellette , P. Lubrano , D. Malyshev , M. Mayer , M. N. Mazziotta , J. E. McEnery , P. F. Michelson , T. Mizuno , M. E. Monzani , A. Morselli , K. Murase , P. Nugent , E. Nuss , E. Ofek , T. Ohsugi , M. Orienti , E. Orlando , J. F. Ormes , D. Paneque , M. Pesce-Rollins , F. Piron , G. Pivato , S. Rainò , R. Rando , M. Razzano , A. Reimer , O. Reimer , A. Schulz , C. Sgrò , E. J. Siskind , F. Spada , G. Spandre , P. Spinelli , D. J. Suson , H. Takahashi , J. B. Thayer , L. Tibaldo , D. F. Torres , E. Troja , G. Vianello , M. Werner , K. S. Wood , M. Wood

Following our work presented in Dai et al. (2016), we report our detailed data analysis for another 38 Fermi gamma-ray un-associated sources. These sources are selected from the Fermi Large Area Telescope (LAT) third source catalog on the…

High Energy Astrophysical Phenomena · Physics 2021-06-03 Xuejie Dai , Zhongxiang Wang , V. Jithesh , Yi Xing

We present a catalog of 6266 solar flares detected by the X-Ray Solar Monitor onboard the Chandrayaan-2 lunar orbiter between 1.55 and 12.4 keV (1 and 8 \AA) from 2019 September 12 to 2022 November 4, including 1469 type A flares. The…

We present precise phase-connected pulse timing solutions for 16 gamma-ray-selected pulsars recently discovered using the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope plus one very faint radio pulsar (PSR J1124-5916)…

We search for gamma-ray emission from OJ287 in the energy range from 0.1-300 GeV during 2015-2023, in coincidence with an extensive observing campaign to monitor the optical flux variability and polarization, as discussed in…

High Energy Astrophysical Phenomena · Physics 2024-07-29 Vibhavasu Pasumarti , Shantanu Desai

Distance measurements of gamma-ray pulsars are challenging questions in present pulsar studies. The Large Area Telescope (LAT) aboard the Fermi gamma-ray observatory discovered more than 70 gamma-ray pulsars including 24 new gamma-selected…

High Energy Astrophysical Phenomena · Physics 2015-05-27 W. Wang

AIMS. We are studying an unbiased sample of 42 nearby (z < 0.2) BL Lacertae objects with a multi-wavelength approach. The results of VLBI observations were presented in the first paper of this series. In this paper, we study the…

High Energy Astrophysical Phenomena · Physics 2018-11-08 F. D'Ammando , M. Giroletti , S. Rainò

Context: GeV gamma-ray pulsations from over 140 pulsars have been characterized using the Fermi Large Area Telescope, enabling improved understanding of the emission regions within the neutron star magnetospheres, and the contributions of…

The radio, optical, and $\gamma$-ray light curves of the blazar S5 1803+784, from the beginning of the {\it Fermi} Large Area Telescope (LAT) mission in August 2008 until December 2018, are presented. The aim of this work is to look for…

High Energy Astrophysical Phenomena · Physics 2021-03-03 R. Nesci , S. Cutini , C. Stanghellini , F. Martinelli , A. Maselli , V. M. Lipunov , V. Kornilov , R. R. Lopez , A. Siviero , M. Giroletti , M. Orienti

We report Fermi/LAT observations and broad-band spectral modeling of the radio-loud active galaxy 4C +55.17 (z=0.896), formally classified as a flat-spectrum radio quasar. Using 19 months of all-sky survey Fermi/LAT data, we detect a…

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