GRB Observations with H.E.S.S. II

Hoischen, C.; Balzer, A.; Bissaldi, E.; Füßling, M.; Garrigoux, T.; Gottschall, D.; Holler, M.; Mitchell, Alison; O’Brien, P. T.; Parsons, R. D.; Pühlhofer, G.; Rowell, G.; Schüßler, F.; Tam, P. H. T.; Wagner, S. J.

doi:10.22323/1.301.0636

Cited by 14 publications

(8 citation statements)

References 10 publications

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“…At 100 GeV energies, the H.E.S.S. differential sensitivity of a 15-h observation is a factor ∼50 better than Fermi−LAT in a 30-day period (Hoischen et al 2017), which motivates the H.E.S.S. observations presented here.…”

Section: Introductionsupporting

confidence: 74%

Detection of very-high-energy γ-ray emission from the colliding wind binary η Car with H.E.S.S.

Abdalla¹,

Adam²,

Aharonian³

et al. 2020

A&A

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Aims. Colliding wind binary systems have long been suspected to be high-energy (HE; 100 MeV < E < 100 GeV) γ-ray emitters. η Car is the most prominent member of this object class and is confirmed to emit phase-locked HE γ rays from hundreds of MeV to ~100 GeV energies. This work aims to search for and characterise the very-high-energy (VHE; E >100 GeV) γ-ray emission from η Car around the last periastron passage in 2014 with the ground-based High Energy Stereoscopic System (H.E.S.S.). Methods. The region around η Car was observed with H.E.S.S. between orbital phase p = 0.78−1.10, with a closer sampling at p ≈ 0.95 and p ≈ 1.10 (assuming a period of 2023 days). Optimised hardware settings as well as adjustments to the data reduction, reconstruction, and signal selection were needed to suppress and take into account the strong, extended, and inhomogeneous night sky background (NSB) in the η Car field of view. Tailored run-wise Monte-Carlo simulations (RWS) were required to accurately treat the additional noise from NSB photons in the instrument response functions. Results. H.E.S.S. detected VHE γ-ray emission from the direction of η Car shortly before and after the minimum in the X-ray light-curve close to periastron. Using the point spread function provided by RWS, the reconstructed signal is point-like and the spectrum is best described by a power law. The overall flux and spectral index in VHE γ rays agree within statistical and systematic errors before and after periastron. The γ-ray spectrum extends up to at least ~400 GeV. This implies a maximum magnetic field in a leptonic scenario in the emission region of 0.5 Gauss. No indication for phase-locked flux variations is detected in the H.E.S.S. data.

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Section: Introductionsupporting

confidence: 74%

Detection of very-high-energy γ-ray emission from the colliding wind binary η Car with H.E.S.S.

Abdalla¹,

Adam²,

Aharonian³

et al. 2020

A&A

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show abstract

“…Past TeV-band observations of GRBs with MAGIC and other facilities. The search for TeV gamma rays from GRBs had been pursued over many years employing a variety of experimental techniques, but no clear detections had been previously achieved [50][51][52][53][54][55][56][57][58][59][60][61] .…”

Section: Magic Observations Of Grbmentioning

confidence: 99%

Teraelectronvolt emission from the $γ$-ray burst GRB 190114C

Acciari,

Ansoldi,

Antonelli

et al. 2020

Preprint

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“…While ground-based imaging atmospheric Cherenkov telescopes (IACTs) have run extensive GRB follow-up programs for more than a decade (see e.g. [20,21]), only now optimised observation strategies have paid off. The first announcement of GRB190114C by MAGIC [22] was followed by the H.E.S.S.…”

Section: Pos(leptonphoton2019)030mentioning

confidence: 99%

Multi-messenger searches in astrophysics

Egberts¹

2019

Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019)

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Multi-messenger astronomy has experienced an explosive development in the past few years. While not being a particularly young field, it has recently attracted a lot of attention by several major discoveries and unprecedented observation campaigns covering the entity of the electromagnetic spectrum as well as observations of cosmic rays, neutrinos, and gravitational waves. The exploration of synergies is in full steam and requires close cooperation between different instruments. Here I give an overview over the subject of multi-messenger astronomy and its virtues compared to classical "single messenger" observations, present the recent break throughs of the field, and discuss some of its organisational and technical challenges.

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GRB Observations with H.E.S.S. II

Cited by 14 publications

References 10 publications

Detection of very-high-energy γ-ray emission from the colliding wind binary η Car with H.E.S.S.

Detection of very-high-energy γ-ray emission from the colliding wind binary η Car with H.E.S.S.

Teraelectronvolt emission from the $γ$-ray burst GRB 190114C

Multi-messenger searches in astrophysics

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