Year: 2025
Type: conference-paper
Abstract: Gamma-ray bursts (GRBs) originate from explosions at cosmological distances, generating collimated jets. GRB 221009A, exploded on 9 October 2022, has been established as the brightest GRB to date. Its bright and long emission was extensively followed up from radio to gamma rays. LHAASO firmly detected the onset of the afterglow emission at energies up to $\sim$13 TeV within about an hour after the burst, starting just a few minutes after the trigger. While this VHE emission component can be accounted for in a narrow jet scenario, such an interpretation cannot reproduce the broadband emission observed at later times, which exceeds the theoretical expectations. This discrepancy can be settled if more complex models are considered, providing the first strong evidence for a structured jet in a long GRB. Unfortunately, the VHE emission after a few hours is poorly constrained, as sensitive VHE observations by Cherenkov Telescopes were prevented due to strong moonlight conditions. The first Large-Sized Telescope (LST-1) of the future Cherenkov Telescope Array Observatory began observations about one day after the burst under high night sky background conditions. These observations are the first ones performed on GRB 221009A by a Cherenkov telescope, revealing a hint of a signal with a statistical significance of about 4$\sigma$ during the observations performed at 1.3 days after the burst. The monitoring campaign continued until the end of November 2022, making it the deepest observation campaign performed on a GRB with the LST-1. In this contribution, we will present the analysis results of the LST-1 observation campaign on GRB 221009A in October 2022.
DOI: 10.22323/1.501.0548
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Funders: Sveučilište u Zagrebu, European Commission, Deutsche Forschungsgemeinschaft, Ministry of Education, Culture, Sports, Science and Technology, Fundação de Amparo à Pesquisa do Estado de São Paulo, Ministerstvo Školství, Mládeže a Tělovýchovy, Bundesministerium für Bildung und Forschung, Generalitat de Catalunya, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Max-Planck-Gesellschaft, Narodowe Centrum Nauki, Hrvatska Zaklada za Znanost, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Fundação Araucária, Centre National de la Recherche Scientifique, Ministerio de Ciencia e Innovación, Istituto Nazionale di Astrofisica, Sveučilište Josipa Jurja Strossmayera u Osijeku, Ministério da Ciência, Tecnologia, Inovações e Comunicações, Istituto Nazionale di Fisica Nucleare, Japan Society for the Promotion of Science, Consejo Superior de Investigaciones Científicas, European Regional Development Fund, Agencia Estatal de Investigación, Institut National de Physique Nucléaire et de Physique des Particules, Institute for Cosmic Ray Research, University of Tokyo
Awards: G1059663884, G1089506725, G1293671712, G1381791653, G1436497499, G1485410139, G176604203, G1855990336, G1918422760, G195395952, G196419191, G2209488408, G2233160401, G2262748287, G2313451655, G2492639332, G2494670923, G2507835933, G2554159582, Cherenkov Telescope Array - participation of the Czech Republic, G2660406951, G267968979, G2753747443, G282847690, G291036901, G302750986, G304813024, G3178956404, G3197651753, G3384621141, G3406277477, G3439265645, G3480869486, G3490171961, G3622461675, G3681454997, G3690828678, G3735356012, G3780874795, G3817602061, G4042783231, G425668148, G4317403835, 癌細胞の遊離, 定着機構と転移抑制に関する研究, G451917667, G4552759544, G463062595, 原子炉による悪性皮膚腫瘍の選択的治療, G4973718836, G5011157824, Very-high-energy Gamma Ray Astronomy in the Multi-messenger Era, G5421974903, G545007060, G5641063287, G5845768719, G5894067328, G5915139351, G5916014575, G5967599077, G617610489, G6377940362, G6393254597, G6649312515, G6775736318, G7084143925, G7363506711, G7392162325, 古代説話における諸寺縁起の研究, G76655229, G8079053745, G8347645112, G8412270318, G8639560392, G8684520763, G880499800, G8920101981, G8920660035, G8927985011
OpenAlex ID: W4414425123
FWCI:
Cites:
Cited by:
Related to: