activity
20092025
most citedOn the origin of the gamma-ray emission from the flaring blazar PKS 1222+216

144 citations · 524 across the 12 of their papers we have counts for

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9 papers · 1 filter

astro-ph.HE2025

Constraining the TeV gamma-ray emission of SN 2024bch, a possible type IIn-L from a red supergiant progenitor. Multiwavelength observations and analysis of the progenitor

The CTAO-LST Project, :, K. Abe +332

We present very high-energy optical photometry and spectroscopic observations of SN 2024bch in the nearby galaxy NGC 3206 (\sim 20 Mpc). We used gamma-ray observations performed wi…

astro-ph.HE2025

Multi-wavelength observations of a jet launch in real time from the post-changing-look Active Galaxy 1ES 1927+654

Sibasish Laha, Eileen T. Meyer, Dev R. Sadaula +34

We present results from a high cadence multi-wavelength observational campaign of the enigmatic changing look AGN 1ES 1927+654 from May 2022- April 2024, coincident with an unprece…

astro-ph.HE2022

A radio, optical, UV and X-ray view of the enigmatic changing look Active Galactic Nucleus 1ES~1927+654 from its pre- to post-flare states

Sibasish Laha, Eileen Meyer, Agniva Roychowdhury +17

The nearby type-II AGN 1ES1927+654 went through a violent changing-look (CL) event beginning December 2017 during which the optical and UV fluxes increased by four magnitudes over…

astro-ph.HE2021★ 8 cited

HAWC measurements of the energy spectra of cosmic ray protons, helium and heavy nuclei in the TeV range

Juan Carlos Arteaga-Velázquez

Current knowledge of the relative abundances and the energy spectra of the elemental mass groups of cosmic rays in the TeV - PeV interval is uncertain. This situation prev…

astro-ph.HE2021★ 111 cited

Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign

J. C. Algaba, J. Anczarski, K. Asada +36

In 2017, the Event Horizon Telescope (EHT) Collaboration succeeded in capturing the first direct image of the center of the M87 galaxy. The asymmetric ring morphology and size are…

astro-ph.HE2017★ 74 cited

Gamma-ray Blazars Within the First 2 Billion Years

Large Area Telescope Collaboration

The detection of high-redshift (3) blazars enables the study of the evolution of the most luminous relativistic jets over cosmic time. More importantly, high-redshift blazars t…

astro-ph.HE2011★ 144 cited

On the origin of the gamma-ray emission from the flaring blazar PKS 1222+216

F. Tavecchio, J. Becerra-Gonzalez, G. Ghisellini +4

The flat spectrum radio quasar PKS 1222+216 was detected in the very high energy gamma-ray band by MAGIC during a highly active gamma-ray phase following an alert by the LAT onboar…

astro-ph.HE2009★ 6 cited

GRB Observations with the MAGIC Telescopes

Markus Garczarczyk, Markus Gaug, Angelo Antonelli +9

MAGIC is currently the most suitable instrument to perform observations of the prompt an early afterglow emission from Gamma Ray Bursts (GRBs) at energies above 25 GeV. The instrum…

astro-ph.HE2009★ 1 cited

MAGIC observation of GRB090102

Markus Gaug, Stefano Covino, Markus Garczarczyk +9

On January 2, the MAGIC-I Telescope observed GRB090102 (z=1.55) under particularly good observation conditions. Using the recently upgraded MAGIC-1 sum trigger system, upper limits…