H.E.S.S. Follow-up Observations of GRB 221009A

Aharonian F, Benkhali FA, Aschersleben J, Ashkar H, Backes M, Baktash A, Martins VB, Batzofin R, Becherini Y, Berge D, Bernlöhr K, Bi B, Böttcher M, Boisson C, Bolmont J, de Bony de Lavergne M, Borowska J, Bouyahiaoui M, Bradascio F, Breuhaus M, Brose R, Brun F, Bruno B, Bulik T, Burger-Scheidlin C, Caroff S, Casanova S, Celic J, Cerruti M, Chand T, Chandra S, Chen A, Chibueze J, Chibueze O, Cotter G, Dai S, Mbarubucyeye JD, Devin J, Djannati-Ataï A, Dmytriiev A, Doroshenko V, Egberts K, Einecke S, Ernenwein JP, Fegan S, de Clairfontaine GF, Filipovic M, Fontaine G, Füßling M, Funk S, Gabici S, Ghafourizadeh S, Giavitto G, Glawion D, Glicenstein JF, Goswami P, Grolleron G, Grondin MH, Hinton JA, Holch TL, Holler M, Horns D, Huang Z, Jamrozy M, Jankowsky F, Joshi V, Jung-Richardt I, Kasai E, Katarzyński K, Khatoon R, Khélifi B, Kluźniak W, Komin N, Konno R, Kosack K, Kostunin D, Lang RG, Le Stum S, Leitl F, Lemière A, Lemoine-Goumard M, Lenain JP, Leuschner F, Lohse T, Lypova I, Mackey J, Malyshev D, Malyshev D, Marandon V, Marchegiani P, Marcowith A, Martí-Devesa G, Marx R, Meyer M, Mitchell A, Mohrmann L, Montanari A, Moulin E, Murach T, Nakashima K, de Naurois M, Niemiec J, Noel AP, O’Brien P, Ohm S, Olivera-Nieto L, de Ona Wilhelmi E, Ostrowski M, Panny S, Panter M, Parsons RD, Peron G, Prokhorov DA, Prokoph H, Pühlhofer G, Punch M, Quirrenbach A, Reichherzer P, Reimer A, Reimer O, Ren H, Renaud M, Reville B, Rieger F, Rowell G, Rudak B, Ruiz-Velasco E, Sahakian V, Salzmann H, Santangelo A, Sasaki M, Schäfer J, Schüssler F, Schutte HM, Schwanke U, Shapopi JN, Specovius A, Spencer S, Stawarz , Steenkamp R, Steinmassl S, Steppa C, Sushch I, Suzuki H, Takahashi T, Tanaka T, Terrier R, Tsuji N, Uchiyama Y, Vecchi M, Venter C, Vink J, Wagner SJ, White R, Wierzcholska A, Wong YW, Zacharias M, Zargaryan D, Zdziarski AA, Zech A, Zhu SJ, Żywucka N (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Book Volume: 946

Article Number: L27

Journal Issue: 1

DOI: 10.3847/2041-8213/acc405

Abstract

GRB 221009A is the brightest gamma-ray burst (GRB) ever detected. To probe the very-high-energy (VHE; >100 GeV) emission, the High Energy Stereoscopic System (H.E.S.S.) began observations 53 hr after the triggering event, when the brightness of the moonlight no longer precluded observations. We derive differential and integral upper limits using H.E.S.S. data from the third, fourth, and ninth nights after the initial GRB detection, after applying atmospheric corrections. The combined observations yield an integral energy flux upper limit of Φ UL 95 % = 9.7 × 10 − 12 erg cm − 2 s − 1 above E thr = 650 GeV. The constraints derived from the H.E.S.S. observations complement the available multiwavelength data. The radio to X-ray data are consistent with synchrotron emission from a single electron population, with the peak in the spectral energy distribution occurring above the X-ray band. Compared to the VHE-bright GRB 190829A, the upper limits for GRB 221009A imply a smaller gamma-ray to X-ray flux ratio in the afterglow. Even in the absence of a detection, the H.E.S.S. upper limits thus contribute to the multiwavelength picture of GRB 221009A, effectively ruling out an IC-dominated scenario.

Authors with CRIS profile

Involved external institutions

Eberhard Karls Universität Tübingen Germany (DE) University of Montpellier / Université Montpellier France (FR) Max-Planck-Institut für Kernphysik (MPIK) / Max Planck Institute for Nuclear Physics Germany (DE) Ruprecht-Karls-Universität Heidelberg Germany (DE) Humboldt-Universität zu Berlin Germany (DE) Institute of Research into the Fundamental Laws of the Universe / Institut de recherche sur les lois fondamentales de l'univers (IRFU) France (FR) Noordwes-Universiteit / North-West University South Africa (ZA) Université Paris-Sud France (FR) Deutsches Elektronen-Synchrotron DESY Germany (DE) University of Adelaide Australia (AU) University of the Witwatersrand (WITS) South Africa (ZA) Universität Potsdam Germany (DE) Kapteyn Astronomical Institute Netherlands (NL) Laboratoire Univers et Théories (LUTH) / Laboratory of the Universe and Theories France (FR) University of Savoy Mont Blanc / Université Savoie Mont Blanc France (FR) Laboratoire Leprince-Ringuet (LLR) France (FR) Institut national de physique nucléaire et de physique des particules (IN2P3) France (FR) Institute of Nuclear Physics PAN / Instytut Fizyki Jądrowej im. Henryka Niewodniczańskiego PAN Poland (PL) University of Warsaw / Uniwersytet Warszawski Poland (PL) Universität Hamburg (UHH) Germany (DE) University of Namibia (UNAM) Namibia (NA) Dublin Institute for Advanced Studies (DIAS) Ireland (IE) Sorbonne Université France (FR) University of Oxford United Kingdom (GB) University of Western Sydney Australia (AU)

How to cite

APA:

Aharonian, F., Benkhali, F.A., Aschersleben, J., Ashkar, H., Backes, M., Baktash, A.,... Żywucka, N. (2023). H.E.S.S. Follow-up Observations of GRB 221009A. Astrophysical Journal Letters, 946(1). https://dx.doi.org/10.3847/2041-8213/acc405

MLA:

Aharonian, F., et al. "H.E.S.S. Follow-up Observations of GRB 221009A." Astrophysical Journal Letters 946.1 (2023).

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