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. 2021 Jun 4;372(6546):1081-1085.
doi: 10.1126/science.abe8560.

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

H.E.S.S. CollaborationH Abdalla  1 F Aharonian  2   3   4 F Ait Benkhali  3 E O Angüner  5 C Arcaro  6 C Armand  7 T Armstrong  8 H Ashkar  9 M Backes  1   6 V Baghmanyan  10 V Barbosa Martins  11 A Barnacka  12 M Barnard  6 Y Becherini  13 D Berge  11 K Bernlöhr  3 B Bi  14 E Bissaldi  15   16 M Böttcher  6 C Boisson  17 J Bolmont  18 M de Bony de Lavergne  7 M Breuhaus  3 F Brun  9 P Brun  9 M Bryan  19 M Büchele  20 T Bulik  21 T Bylund  13 S Caroff  7 A Carosi  7 S Casanova  3   10 T Chand  6 S Chandra  6 A Chen  22 G Cotter  8 M Curyło  21 J Damascene Mbarubucyeye  11 I D Davids  1 J Davies  8 C Deil  3 J Devin  23 L Dirson  24 A Djannati-Ataï  23 A Dmytriiev  17 A Donath  3 V Doroshenko  14 L Dreyer  6 C Duffy  25 J Dyks  26 K Egberts  27 F Eichhorn  20 S Einecke  28 G Emery  18 J-P Ernenwein  5 K Feijen  28 S Fegan  29 A Fiasson  7 G Fichet de Clairfontaine  17 G Fontaine  29 S Funk  20 M Füßling  11 S Gabici  23 Y A Gallant  30 G Giavitto  11 L Giunti  9   23 D Glawion  20 J F Glicenstein  9 M-H Grondin  31 J Hahn  3 M Haupt  11 G Hermann  3 J A Hinton  3 W Hofmann  3 C Hoischen  27 T L Holch  11 M Holler  32 M Hörbe  8 D Horns  24 D Huber  32 M Jamrozy  12 D Jankowsky  20 F Jankowsky  33 A Jardin-Blicq  3 V Joshi  20 I Jung-Richardt  20 E Kasai  1 M A Kastendieck  24 K Katarzyński  34 U Katz  20 D Khangulyan  35 B Khélifi  23 S Klepser  11 W Kluźniak  26 Nu Komin  22 R Konno  11 K Kosack  9 D Kostunin  11 M Kreter  6 G Lamanna  7 A Lemière  23 M Lemoine-Goumard  31 J-P Lenain  18 F Leuschner  14 C Levy  18 T Lohse  36 I Lypova  11 J Mackey  37 J Majumdar  11 D Malyshev  14 D Malyshev  20 V Marandon  3 P Marchegiani  22 A Marcowith  30 A Mares  31 G Martí-Devesa  32 R Marx  33   3 G Maurin  7 P J Meintjes  38 M Meyer  20 A Mitchell  3 R Moderski  26 L Mohrmann  20 A Montanari  9 C Moore  25 P Morris  8 E Moulin  9 J Muller  29 T Murach  11 K Nakashima  20 A Nayerhoda  10 M de Naurois  29 H Ndiyavala  6 J Niemiec  10 L Oakes  36 P O'Brien  25 H Odaka  39 S Ohm  11 L Olivera-Nieto  3 E de Ona Wilhelmi  11 M Ostrowski  12 S Panny  32 M Panter  3 R D Parsons  36 G Peron  3 B Peyaud  9 Q Piel  7 S Pita  23 V Poireau  7 A Priyana Noel  12 D A Prokhorov  19 H Prokoph  11 G Pühlhofer  14 M Punch  13   23 A Quirrenbach  33 S Raab  20 R Rauth  32 P Reichherzer  9 A Reimer  32 O Reimer  32 Q Remy  3 M Renaud  30 F Rieger  3 L Rinchiuso  9 C Romoli  40 G Rowell  28 B Rudak  26 E Ruiz-Velasco  40 V Sahakian  41 S Sailer  3 H Salzmann  14 D A Sanchez  7 A Santangelo  14 M Sasaki  20 M Scalici  14 J Schäfer  20 F Schüssler  42 H M Schutte  6 U Schwanke  36 M Seglar-Arroyo  9 M Senniappan  13 A S Seyffert  6 N Shafi  22 J N S Shapopi  1 K Shiningayamwe  1 R Simoni  19 A Sinha  23 H Sol  17 A Specovius  20 S Spencer  8 M Spir-Jacob  23 Ł Stawarz  12 L Sun  19 R Steenkamp  1 C Stegmann  27   11 S Steinmassl  3 C Steppa  27 T Takahashi  43 T Tam  44 T Tavernier  9 A M Taylor  45 R Terrier  23 J H E Thiersen  6 D Tiziani  20 M Tluczykont  24 L Tomankova  20 M Tsirou  3 R Tuffs  3 Y Uchiyama  46 D J van der Walt  6 C van Eldik  20 C van Rensburg  1 B van Soelen  38 G Vasileiadis  30 J Veh  20 C Venter  6 P Vincent  18 J Vink  19 H J Völk  3 Z Wadiasingh  6 S J Wagner  33 J Watson  8 F Werner  3 R White  3 A Wierzcholska  10   33 Yu Wun Wong  20 A Yusafzai  20 M Zacharias  6   17 R Zanin  3 D Zargaryan  37   4 A A Zdziarski  26 A Zech  17 S J Zhu  45 J Zorn  3 S Zouari  23 N Żywucka  6 P Evans  25 K Page  25
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Revealing x-ray and gamma ray temporal and spectral similarities in the GRB 190829A afterglow

H.E.S.S. Collaboration et al. Science. .

Abstract

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.

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