H.E.S.S. follow-up observations of GRB 221009A
J.D. Mbarubucyeye*,
On behalf of the Hess Collaboration,
F. Aharonian,
F. Ait-Benkhali,
A. Alkan,
J. Aschersleben,
H. Ashkar, M. Backes, A. Baktash, V. Barbosa Martins, A. Barnacka, J. Barnard, R.W. Batzofin, Y. Becherini, G. Beck, D. Berge, K. Bernloehr, B. Bi, M. Boettcher, C. Boisson, J. Bolmont, M. Bony (de), J. Borowska, M. Bouyahiaoui, F. Bradascio, M. Breuhaus, R. Brose, A. Brown, F. Brun, B. Bruno, T. Bulik, C. Burger-Scheidlin, T. Bylund, F. Cangemi, S. Caroff, S. Casanova, R. Cecil, J. Celic, M. Cerruti, P. Chambéry, T.B. Chand, S. Chandra, A. Chen, J.O. Chibueze, O. Chibueze, T. Collins, G. Cotter, P. Cristofari, J. Damascene Mbarubucyeye, I.D. Davids, J. Davies, L. de Jonge, J. Devin, A. Djannati-Ataï, J.I. Djuvsland, A. Dmytriiev, V. Doroshenko, L. Dreyer, L. Du Plessis, K. Egberts, S. Einecke, J.P. Ernenwein, S. Fegan, K. Feijen, G. Fichet de Clairfontaine, G. Fontaine, L. Frans, M. Fuessling, S. Funk, S. Gabici, Y. Gallant, S. Ghafourizadeh, G. Giavitto, L. Giunti, D. Glawion, J.F. Glicenstein, J. Glombitza, P. Goswami, G. Grolleron, M.H. Grondin, L. Haerer, S. Hattingh, M. Haupt, G. Hermann, J. Hinton, W. Hofmann, T. Holch, M. Holler, D. Horns, Z.Q. Huang, A. Jaitly, M. Jamrozy, F. Jankowsky, A. Jardin-Blicq, V. Joshi, I. Jung-Richardt, E. Kasai, K. Katarzynski, H. Katjaita, D. Khangulyan, R. Khatoon, B. Khelifi, S. Klepser, W. Kluzniak, N. Komin, R. Konno, K. Kosack, D. Kostunin, A. Kundu, G. Lamanna, R.G. Lang, S. Le Stum, V. Lefranc, F. Leitl, A. Lemiere, M. Lemoine-Goumard, J.P. Lenain, F. Leuschner, A. Luashvili, I. Lypova, J. Mackey, D. Malyshev, D. Malyshev, V. Marandon, A. Marcowith, P.D. Marinos, G. Marti'i-Devesa, R. Marx, G. Maurin, A. Mehta, P. Meintjes, M. Meyer, A. Mitchell, R. Moderski, L. Mohrmann, A. Montanari, C. Moore, E. Moulin, T. Murach, K. Nakashima, M. Naurois (de), H. Ndiyavala, J. Niemiec, A. Noel, P. O'Brien, S. Ohm, L. Olivera-Nieto, E. Ona-Wilhelmi (de), M. Ostrowski, E. Oukacha, S. Panny, M. Panter, D. Parsons, U. Pensec, G. Peron, S. Pita, V. Poireau, D. Prokhorov, H. Prokoph, G. Puehlhofer, M. Punch, A. Quirrenbach, M. Regeard, P. Reichherzer, A. Reimer, O. Reimer, I. Reis, Q. Remy, H.X. Ren, M. Renaud, B. Reville, F. Rieger, G. Roellinghoff, E. Rol, G.P. Rowell, B. Rudak, H. Rueda Ricarte, E. Ruiz Velasco, K. Sabri, V. Sahakian, S. Sailer, H. Salzmann, D. Sanchez, A. Santangelo, M. Sasaki, J. Schaefer, F. Schüssler, H. Schutte, M. Senniappan, J.N.S. Shapopi, S. Shilunga, K. Shiningayamwe, H. Sol, H. Spackman, A. Specovius, S. Spencer, L. Stawarz, R. Steenkamp, C. Stegmann, S. Steinmassl, C. Steppa, K. Streil, I. Sushch, H. Suzuki, T. Takahashi, T. Tanaka, T. Tavernier, A. Taylor, R. Terrier, A. Thakur, H. Thiersen, C. Thorpe-Morgan, M. Tluczykont, M. Tsirou, N. Tsuji, R. Tuffs, Y. Uchiyama, M. Ullmo, T. Unbehaun, P. van der Merwe, C. van Eldik, B. van Soelen, G. Vasileiadis, M. Vecchi, J. Veh, C. Venter, J. Vink, H. Voelk, N. Vogel, T. Wach, S. Wagner, F. Werner, R. White, A. Wierzcholska, Y.W. Wong, H.M. Yassin, M. Zacharias, D. Zargaryan, A. Zdziarski, A. Zech, S. Zhu, A. Zmija, S. Zouari and N. Żywuckaet al. (click to show)*: corresponding author
Pre-published on:
July 27, 2023
Published on:
September 27, 2024
Abstract
GRB 221009A is the brightest gamma-ray burst ever detected. To probe the very-high-energy (VHE, >100 GeV) emission, the High Energy Stereoscopic System (H.E.S.S.) began observations 51.8 hours after the triggering event, when the brightness of the moonlight no longer precluded observations. No significant VHE emission from the gamma-ray burst is detected in an analysis with H.E.S.S. data. Differential and integral upper limits are computed using data from the third, fourth, and ninth nights after the initial detection of the GRB. The constraints derived from the H.E.S.S. observations complement the available multi-wavelength data. For example, the afterglow of GRB 221009A presents a novel opportunity to explore extreme Klein-Nishina effects, for which upper limits in the VHE band are valuable. We will present and discuss the results of the analysis and highlight the important role of IACTs in following up such powerful events.
DOI: https://doi.org/10.22323/1.444.0705
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