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

Aharonian, F. and Benkhali, F. Ait and Aschersleben, J. and Ashkar, H. and Backes, M. and Baktash, A. and Martins, V. Barbosa and Batzofin, R. and Becherini, Y. and Berge, D. and Bernlöhr, K. and Bi, B. and Böttcher, M. and Boisson, C. and Bolmont, J. and de Bony de Lavergne, M. and Borowska, J. and Bouyahiaoui, M. and Bradascio, F. and Breuhaus, M. and Brose, R. and Brun, F. and Bruno, B. and Bulik, T. and Burger-Scheidlin, C. and Caroff, S. and Casanova, S. and Celic, J. and Cerruti, M. and Chand, T. and Chandra, S. and Chen, A. and Chibueze, J. and Chibueze, O. and Cotter, G. and Dai, S. and Mbarubucyeye, J. Damascene and Devin, J. and Djannati-Ataï, A. and Dmytriiev, A. and Doroshenko, V. and Egberts, K. and Einecke, S. and Ernenwein, J.-P. and Fegan, S. and de Clairfontaine, G. Fichet and Filipovic, M. and Fontaine, G. and Füßling, M. and Funk, S. and Gabici, S. and Ghafourizadeh, S. and Giavitto, G. and Glawion, D. and Glicenstein, J. F. and Goswami, P. and Grolleron, G. and Grondin, M.-H. and Hinton, J. A. and Holch, T. L. and Holler, M. and Horns, D. and Huang, Zhiqiu and Jamrozy, M. and Jankowsky, F. and Joshi, V. and Jung-Richardt, I. and Kasai, E. and Katarzyński, K. and Khatoon, R. and Khélifi, B. and Kluźniak, W. and Komin, Nu. and Konno, R. and Kosack, K. and Kostunin, D. and Lang, R. G. and Le Stum, S. and Leitl, F. and Lemière, A. and Lemoine-Goumard, M. and Lenain, J.-P. and Leuschner, F. and Lohse, T. and Lypova, I. and Mackey, J. and Malyshev, D. and Malyshev, D. and Marandon, V. and Marchegiani, P. and Marcowith, A. and Martí-Devesa, G. and Marx, R. and Meyer, M. and Mitchell, A. and Mohrmann, L. and Montanari, A. and Moulin, E. and Murach, T. and Nakashima, K. and de Naurois, M. and Niemiec, J. and Noel, A. Priyana and O’Brien, P. and Ohm, S. and Olivera-Nieto, L. and de Ona Wilhelmi, E. and Ostrowski, M. and Panny, S. and Panter, M. and Parsons, R. D. and Peron, G. and Prokhorov, D. A. and Prokoph, H. and Pühlhofer, G. and Punch, M. and Quirrenbach, A. and Reichherzer, P. and Reimer, A. and Reimer, O. and Ren, H. and Renaud, M. and Reville, B. and Rieger, F. and Rowell, G. and Rudak, B. and Ruiz-Velasco, E. and Sahakian, V. and Salzmann, H. and Santangelo, A. and Sasaki, M. and Schäfer, J. and Schüssler, F. and Schutte, H. M. and Schwanke, U. and Shapopi, J. N. S. and Specovius, A. and Spencer, S. and Stawarz, Ł. and Steenkamp, R. and Steinmassl, S. and Steppa, C. and Sushch, I. and Suzuki, H. and Takahashi, T. and Tanaka, T. and Terrier, R. and Tsuji, N. and Uchiyama, Y. and Vecchi, M. and Venter, C. and Vink, J. and Wagner, S. J. and White, R. and Wierzcholska, A. and Wong, Yu Wun and Zacharias, M. and Zargaryan, D. and Zdziarski, A. A. and Zech, A. and Zhu, S. J. and Żywucka, N. (2023) H.E.S.S. Follow-up Observations of GRB 221009A. The Astrophysical Journal Letters, 946 (1). L27. ISSN 2041-8205

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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 ${{\rm{\Phi }}}_{\mathrm{UL}}^{95 \% }=9.7\times {10}^{-12}\,\mathrm{erg}\,{\mathrm{cm}}^{-2}\,{{\rm{s}}}^{-1}$ above Ethr = 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.

Item Type: Article
Subjects: Open Asian Library > Physics and Astronomy
Depositing User: Unnamed user with email support@openasianlibrary.com
Date Deposited: 18 Apr 2023 05:46
Last Modified: 28 Oct 2024 08:19
URI: http://publications.eprintglobalarchived.com/id/eprint/997

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