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Revealing x-ray and gamma ray temporal and spectral similarities in the GRB 190829A afterglow

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journal contribution
posted on 20.09.2021, 13:53 by H Abdalla, F Aharonian, F Ait Benkhali, EO Anguner, C Arcaro, C Armand, T Armstrong, H Ashkar, M Backes, V Baghmanyan, V Barbosa Martins, A Barnacka, M Barnard, Y Becherini, D Berge, K Bernloehr, B Bi, E Bissaldi, M Bottcher, C Boisson, J Bolmont, M de Bony de Lavergne, M Breuhaus, F Brun, P Brun, M Bryan, M Buechele, T Bulik, T Bylund, S Caroff, A Carosi, S Casanova, T Chand, S Chandra, A Chen, G Cotter, J Damascene Mbarubucyeye, ID Davids, J Davies, C Deil, J Devin, L Dirson, A Dmytriiev, A Donath, V Doroshenko, L Dreyer, C Duffy, J Dyks, K Egberts, F Eichhorn, S Einecke, G Emery, J-P Ernenwein, K Feijen, S Fegan, A Fiasson, G Fichet de Clairfontaine, G Fontaine, S Funk, M Fuessling, S Gabici, YA Gallant, G Giavitto, L Giunti, D Glawion, JF Glicenstein, M-H Grondin, J Hahn, M Haupt, G Hermann, JA Hinton, W Hofmann, C Hoischen, TL Holch, M Holler, M Horbe, D Horns, D Huber, M Jamrozy, D Jankowsky, F Jankowsky, A Jardin-Blicq, V Joshi, I Jung-Richardt, E Kasai, MA Kastendieck, K Katarzynski, U Katz, D Khangulyan, B Khelifi, S Klepser, W Kluzniak, Nu Komin, R Konno, K Kosack, D Kostunin, M Kreter, G Lamanna, A Lemiere, M Lemoine-Goumard, J-P Lenain, F Leuschner, C Levy, T Lohse, I Lypova, J Mackey, J Majumdar, D Malyshev, V Marandon, P Marchegiani, A Marcowith, A Mares, R Marx, G Maurin, PJ Meintjes, M Meyer, A Mitchell, R Moderski, L Mohrmann, A Montanari, C Moore, P Morris, E Moulin, J Muller, T Murach, K Nakashima, A Nayerhoda, M de Naurois, H Ndiyavala, J Niemiec, L Oakes, P O'Brien, H Odaka, S Ohm, L Olivera-Nieto, E de OnaWilhelmi, M Ostrowski, S Panny, M Panter, RD Parsons, G Peron, B Peyaud, Q Piel, S Pita, V Poireau, A Priyana Noel, DA Prokhorov, H Prokoph, G Puehlhofer, M Punch, A Quirrenbach, S Raab, R Rauth, P Reichherzer, A Reimer, O Reimer, Q Remy, M Renaud, F Rieger, L Rinchiuso, C Romoli, G Rowell, B Rudak, E Ruiz-Velasco, V Sahakian, S Sailer, H Salzmann, DA Sanchez, A Santangelo, M Sasaki, M Scalici, J Schaefer, F Schuessler, HM Schutte, U Schwanke, M Seglar-Arroyo, M Senniappan, AS Seyffert, N Shafi, JNS Shapopi, K Shiningayamwe, R Simoni, A Sinha, H Sol, A Specovius, S Spencer, L Sun, R Steenkamp, C Stegmann, S Steinmassl, C Steppa, T Takahashi, T Tam, T Tavernier, AM Taylor, R Terrier, JHE Thiersen, D Tiziani, M Tluczykont, L Tomankova, M Tsirou, R Tuffs, Y Uchiyama, DJ van der Walt, C van Eldik, C van Rensburg, B van Soelen, G Vasileiadis, J Veh, C Venter, P Vincent, J Vink, HJ Voelk, Z Wadiasingh, SJ Wagner, J Watson, F Werner, R White, A Wierzcholska, YuWunWong, A Yusafzai, M Zacharias, R Zanin, D Zargaryan, AA Zdziarski, A Zech, SJ Zhu, J Zorn, S Zouari, P Evans, K Page
Gamma-ray bursts (GRBs), which are bright flashes of gamma rays from extragalactic sources followed by fading afterglow emission, are associated with stellar core collapse events. We report the detection of very-high-energy (VHE) gamma rays from the afterglow of GRB 190829A, between 4 and 56 hours after the trigger, using the High Energy Stereoscopic System (H.E.S.S.). The low luminosity and redshift of GRB 190829A reduce both internal and external absorption, allowing determination of its intrinsic energy spectrum. Between energies of 0.18 and 3.3 tera-electron volts, this spectrum is described by a power law with photon index of 2.07 ± 0.09, similar to the x-ray spectrum. The x-ray and VHE gamma-ray light curves also show similar decay profiles. These similar characteristics in the x-ray and gamma-ray bands challenge GRB afterglow emission scenarios.

Funding

http://dx.doi.org/10.13039/501100001647Deutsches Elektronen-Synchrotron:

History

Citation

SCIENCE, 4 Jun 2021, Vol 372, Issue 6546, pp. 1081-1085, DOI: 10.1126/science.abe8560

Author affiliation

Department of Physics and Astronomy

Version

AM (Accepted Manuscript)

Published in

SCIENCE

Volume

372

Issue

6546

Pagination

1081 - 1085

Publisher

American Association for the Advancement of Science

issn

0036-8075

eissn

1095-9203

Acceptance date

07/04/2021

Copyright date

2021

Available date

09/09/2021

Spatial coverage

United States

Language

English