Article
Physics, Particles & Fields
Xunyu Liang, Ariel Zhitnitsky
Summary: The Telescope Array experiment has recorded several short time bursts of air shower events that are strongly correlated with lightning, possibly representing the direct manifestation of dark matter annihilation events within the axion quark nugget model. This study suggests testing this proposal by searching for radio signals within a specific frequency range, which can be easily discriminated from conventional lightning-induced radio emission.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
C. Cai, S. L. Xiong, C. K. Li, C. Z. Liu, S. N. Zhang, X. B. Li, L. M. Song, B. Li, S. Xiao, Q. B. Yi, Y. Zhu, Y. G. Zheng, W. Chen, Q. Luo, Y. Huang, X. Y. Song, H. S. Zhao, Y. Zhao, Z. Zhang, Q. C. Bu, X. L. Cao, Z. Chang, L. Chen, T. X. Chen, Y. B. Chen, Y. Chen, Y. P. Chen, W. W. Cui, Y. Y. Du, G. H. Gao, H. Gao, M. Y. Ge, Y. D. Gu, J. Guan, C. C. Guo, D. W. Han, J. Huo, S. M. Jia, W. C. Jiang, J. Jin, L. D. Kong, G. Li, T. P. Li, W. Li, X. Li, X. F. Li, Z. W. Li, X. H. Liang, J. Y. Liao, B. S. Liu, H. W. Liu, H. X. Liu, X. J. Liu, F. J. Lu, X. F. Lu, T. Luo, R. C. Ma, X. Ma, B. Meng, Y. Nang, J. Y. Nie, G. Ou, J. L. Qu, X. Q. Ren, N. Sai, L. Sun, Y. Tan, L. Tao, Y. L. Tuo, C. Wang, L. J. Wang, P. J. Wang, W. S. Wang, Y. S. Wang, X. Y. Wen, B. B. Wu, B. Y. Wu, M. Wu, G. C. Xiao, Y. P. Xu, R. J. Yang, S. Yang, Y. J. Yang, Y. R. Yang, X. J. Yang, Q. Q. Yin, Y. You, F. Zhang, H. M. Zhang, J. Zhang, P. Zhang, S. Zhang, W. C. Zhang, W. Zhang, Y. F. Zhang, Y. H. Zhang, X. F. Zhao, S. J. Zheng, D. K. Zhou
Summary: The High Energy X-ray telescope on board the Insight-HXMT can serve as a gamma-ray monitor with high time resolution and large effective area. By improving the coherent search method, we were able to detect 40 GRBs that were too weak to be found in blind search, but did not find any significant burst associated with GW events.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Geosciences, Multidisciplinary
Gregory S. Bowers, Xuan-Min Shao, William Blaine, Brenda Dingus, David M. Smith, Jeff Chaffin, John Ortberg, Hamid K. Rassoul, Cheng Ho, Lukas Nellen, Nissim Fraija, C. Alvarez, J. C. Arteaga-Velazquez, V. Baghmanyan, E. Belmont-Moreno, K. S. Caballero-Mora, A. Carraminana, S. Casanova, E. De la Fuente, M. M. Gonzalez, F. Hueyotl-Zahuantitla, O. Martinez, J. A. Matthews, E. Moreno, M. Newbold, E. G. Perez-Perez, I. Torres
Summary: The study reports anomalously long duration count rate bursts following the impact of cosmic ray showers, termed neutron bursts, near a LaBr3 scintillation detector in Mexico. The characteristic spectra and count rates of these bursts are well explained by neutron absorption in the ground, suggesting similar neutron bursts may be produced by other natural phenomena such as Terrestrial gamma ray flashes.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Astronomy & Astrophysics
G. E. Anderson, M. E. Bell, J. Stevens, M. D. Aksulu, J. C. A. Miller-Jones, A. J. van der Horst, R. A. M. J. Wijers, A. Rowlinson, A. Bahramian, P. J. Hancock, J-P Macquart, S. D. Ryder, R. M. Plotkin
Summary: The Australia Telescope Compact Array (ATCA) rapid-response mode allows for important observations of short-duration gamma-ray bursts, helping to constrain radio afterglow properties and GRB blast wave characteristics. Even in cases where radio afterglow is not detected, the inclusion of force-fitted radio flux densities in afterglow modeling efforts can provide valuable information.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Tanima Mondal, Suman Pramanick, Lekshmi Resmi, Debanjan Bose
Summary: Detection of delayed sub-TeV photons from gamma-ray bursts (GRBs) by MAGIC and HESS has shown the potential of using the Cherenkov Telescope Array (CTA) for afterglow studies. This paper explores the detectability of sub-TeV photons by CTA using a one-zone electron synchrotron and synchrotron self-Compton model. The results suggest that jets with high kinetic energy or large bulk Lorentz factor decelerating into a dense ambient medium offer better detection prospects for CTA.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Dilip Kumar, Soma Sanyal
Summary: The motion of cosmic strings generates wakes behind them, and we studied the magnetized wakes of cosmic strings in the postrecombination plasma. We found that magnetic reconnection occurs in the postshock region, releasing a large amount of kinetic energy. This release of energy during reconnection can account for low-energy gamma-ray bursts in the postrecombination era.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Luohan Wang, Bo-Qiang Ma
Summary: This study investigates the conversion probability of high-energy photons from the gamma ray burst GRB221009A and explores the influence of magnetic field parameters from the source galaxy on this probability. The results demonstrate that the uncertainties in these parameters have a significant impact on the penetration probability, and by comparing the experimental data, more accurate constraints on the parameter ranges can be obtained.
Article
Astronomy & Astrophysics
Matteo Califano, Ivan de Martino, Daniele Vernieri, Salvatore Capozziello
Summary: We investigate the capability of Einstein Telescope to constrain the cosmological parameters of the non-flat lambda CDM cosmological model. Two types of mock data sets are considered depending on whether or not a short gamma-ray burst is detected, and associated with the gravitational wave emitted by binary neutron stars merger, using the THESEUS satellite. The results show that Einstein Telescope can achieve high accuracy in constraining the cosmological parameters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, K. Asano, D. Baack, A. Babic, A. Baquero, U. Barres de Almeida, J. A. Barrio, J. Becerra Gonzalez, W. Bednarek, L. Bellizzi, E. Bernardini, M. Bernardos, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Z. Bosnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, S. M. Colak, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D'Amico, V D'Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, C. Delgado Mendez, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espineira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, G. Ferrara, L. Foffano, M. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. Garcia Lopez, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinovic, J. G. Green, D. Green, D. Hadasch, A. Hahn, L. Heckmann, J. Herrera, J. Hoang, D. Hrupec, M. Huetten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, J. Jormanainen, L. Jouvin, Y. Kajiwara, M. Karjalainen, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, R. Lopez-Coto, M. Lopez-Moya, A. Lopez-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martinez, D. Mazin, S. Mender, D. Miceli, T. Miener, S. Micanovic, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V Moreno, E. Moretti, V Neustroev, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletic, P. Penil, C. Perennes, M. Persic, P. G. Prada Moroni, E. Prandini, C. Priyadarshi, I Puljak, W. Rhode, M. Ribo, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, F. G. Saturni, B. Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, I Snidaric, D. Sobczynska, A. Spolon, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Suric, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzic, M. Teshima, N. Torres-Alba, L. Tosti, S. Truzzi, A. Tutone, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C. F. Vigorito, V. Vitale, I Vovk, M. Will, D. Zaric, L. Nava
Summary: The coincident detection of GW170817 in gravitational waves and electromagnetic radiation provided direct evidence of short gamma-ray bursts originating from binary neutron star mergers. Through high-energy observations such as in the case of GRB 160821B, we can gain better insight into the nature and origin of short GRBs, particularly those associated with BNS mergers. Further studies and future observations in the GeV-TeV bands are crucial for advancing our understanding in this field.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Angana Chakraborty, Maria Dainotti, Olivia Cantrell, Nicole Lloyd-Ronning
Summary: We analyzed two distinct samples of gamma-ray bursts (GRBs), one with radio afterglow emission and one without. Using an updated sample of 211 GRBs, we found that the intrinsic gamma-ray duration (T-int) and isotropic equivalent energy (E-iso) distributions differ significantly between the two populations. We also observed a statistically significant anticorrelation between the jet opening angle and redshift, as well as between T-int and redshift, for both radio-bright and radio-dark GRBs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Brian C. Thomas, Dimitra Atri, Adrian L. Melott
Summary: By analyzing the impact of high-energy gamma-ray burst afterglow photons on planetary atmospheres, we found a small depletion in ozone and a slight enhancement of muon flux at the planet's surface. Overall, the additional afterglow emissions, including TeV photons, do not have a significantly larger impact compared to previous studies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
N. Sarin, R. Hamburg, E. Burns, G. Ashton, P. D. Lasky, G. P. Lamb
Summary: The Zwicky Transient Facility has detected an optical transient AT2020blt at redshift z = 2.9, which is consistent with the afterglow of an on-axis gamma-ray burst. Detailed analysis suggests that AT2020blt is best explained as the afterglow of an on-axis long gamma-ray burst, ruling out other hypotheses. The gamma-ray efficiency of AT2020blt is found to be less than or similar to 0.3-4.5 per cent.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Jin-Da Li, He Gao, Shunke Ai, Wei-Hua Lei
Summary: This study analyzes the potential characteristics of GRB afterglows within the framework of non-axisymmetric structured jets. It finds that the velocity, energy, and line-of-sight direction of each jet element greatly affect the behavior of the overall light curve. The radiative contributions from multiple elements may lead to the appearance of multiple distinct peaks or plateaus in the light curve, with fluctuations in the rising and declining segments of each peak observed.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Jia-Wei Luo, Ye Li, Shunke Ai, He Gao, Bing Zhang
Summary: The joint observations of GW170817 and GRB170817A provide new insights into the study of short-duration gamma-ray bursts (SGRBs). They confirm that SGRBs come from binary neutron star mergers and that the jet generated by this type of merger must have a structured nature. The precise structure of the jet is still debated and it is uncertain if a single unified jet model can apply to all SGRBs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
X. J. Li, Z. B. Zhang, X. L. Zhang, H. Y. Zhen
Summary: This study provides a comprehensive analysis of short gamma-ray bursts (sGRBs) in the third Swift Burst Alert Telescope (BAT) GRB Catalog from December 2004 to July 2019, focusing on the temporal properties of various components in the prompt gamma-ray emission phase. The research reveals that there is no substantial difference in the main peaks between one-component and two-component sGRBs, and the main peaks tend to have longer durations than precursors but shorter durations than extended emissions. Furthermore, power-law correlations related to peak fluxes of the three components suggest they are generated from similar central-engine activities.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2021)
Article
Engineering, Aerospace
N. P. Topchiev, A. M. Galper, I. V. Arkhangelskaja, A. I. Arkhangelskiy, A. V. Bakaldin, R. A. Cherniy, I. V. Chernysheva, E. N. Gudkova, Yu. V. Gusakov, O. D. Dalkarov, A. E. Egorov, M. D. Kheymits, M. G. Korotkov, A. A. Leonov, A. G. Malinin, V. V. Mikhailov, A. V. Mikhailova, P. Yu Minaev, N. Yu. Pappe, M. V. Razumeyko, M. F. Runtso, Yu. I. Stozhkov, S. I. Suchkov, Yu. T. Yurkin
Summary: The future space-based GAMMA-400 gamma-ray telescope will operate onboard the Russian astrophysical observatory in a highly elliptic orbit during 7 years to observe and measure gamma-and cosmic-ray fluxes of various celestial bodies.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Astronomy & Astrophysics
N. Marcelli, M. Boezio, A. Lenni, W. Menn, R. Munini, O. P. M. Aslam, D. Bisschoff, M. D. Ngobeni, M. S. Potgieter, O. Adriani, G. C. Barbarino, G. A. Bazilevskaya, R. Bellotti, E. A. Bogomolov, M. Bongi, V. Bonvicini, A. Bruno, F. Cafagna, D. Campana, P. Carlson, M. Casolino, G. Castellini, C. De Santis, A. M. Galper, S. V. Koldashov, S. Koldobskiy, A. N. Kvashnin, A. A. Leonov, V. V. Malakhov, L. Marcelli, M. Martucci, A. G. Mayorov, M. Merge, E. Mocchiutti, A. Monaco, N. Mori, V. V. Mikhailov, G. Osteria, B. Panico, P. Papini, M. Pearce, P. Picozza, M. Ricci, S. B. Ricciarini, M. Simon, A. Sotgiu, R. Sparvoli, P. Spillantini, Y. I. Stozhkov, A. Vacchi, E. Vannuccini, G. I. Vasilyev, S. A. Voronov, Y. T. Yurkin, G. Zampa, N. Zampa
Summary: The energy spectra of galactic cosmic rays are influenced by the solar activity cycle. New data from the PAMELA experiment provides crucial information for studying solar and heliospheric phenomena.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Astronomy & Astrophysics
F. Rogers, T. Aramaki, M. Boezio, S. E. Boggs, V Bonvicini, G. Bridges, D. Campana, W. W. Craig, P. von Doetinchem, E. Everson, L. Fabris, S. Feldman, H. Fuke, F. Gahbauer, C. Gerrity, C. J. Hailey, T. Hayashi, A. Kawachi, M. Kozai, A. Lenni, A. Lowell, M. Manghisoni, N. Marcelli, B. Mochizuki, S. A. Mognet, K. Munakata, R. Munini, Y. Nakagami, J. Olson, R. A. Ong, G. Osteria, K. M. Perez, S. Quinn, V Re, E. Riceputi, B. Roach, J. Ryan, N. Saffold, V Scotti, Y. Shimizu, R. Sparvoli, A. Stoessl, A. Tiberio, E. Vannuccini, T. Wada, M. Xiao, M. Yamatani, K. Yee, A. Yoshida, T. Yoshida, G. Zampa, J. Zeng, J. Zweerink
Summary: The General Antiparticle Spectrometer (GAPS) is a balloon mission aimed at measuring low-energy cosmic-ray antinuclei. It will detect around 500 cosmic antiprotons per flight and produce a precise antiproton spectrum. This measurement will be sensitive to dark matter, primordial black holes, and cosmic ray propagation.
ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
I. A. Lagoida, S. A. Voronov, V. V. Mikhailov, M. Boezio, R. Munini, G. C. Barbarino, G. A. Bazilevskaya, R. Bellotti, E. A. Bogomolov, V. Bonvicini, F. Cafagna, D. Campana, M. Casolino, A. M. Galper, S. A. Koldobskiy, A. N. Kvashnin, A. Lenni, A. N. Leonov, V. Malakhov, L. Marcelli, N. Marcelli, M. Martucci, A. Mayorov, M. Merge, E. Mocchiutti, A. Monaco, B. Panico, P. Picozza, M. Ricci, S. B. Ricciarini, S. Rodenko, A. Sotgiu, R. Sparvoli, Y. I. Stozhkov, A. Vacchi, E. Vannuccini, G. Vasilyev, Y. T. Yurkin, G. Zampa, N. Zampa
Summary: A Forbush decrease (FD) is a sudden drop in cosmic-ray intensity caused by the propagation of coronal mass ejection (CME) in interplanetary space. The variability in observed FDs is due to different physical properties of each CME. Studying both phenomena is necessary for understanding the processes involved in FDs. Most current studies rely on ground-based experimental data, while direct measurements in space are rare. This study used data from the spacecraft-borne experiment PAMELA to analyze FDs during the period 2006 - 2013, specifically focusing on significant events with amplitude >= 10% for the proton flux R = 1.1 - 2.9 GV. The recovery times of FD events generated by halo-type CMEs were determined based on particle rigidity.
Article
Environmental Sciences
M. Laurenza, D. Del Moro, T. Alberti, R. Battiston, S. Benella, F. Benvenuto, F. Berrilli, I. Bertello, B. Bertucci, L. Biasiotti, C. Campi, V. Carbone, M. Casolino, C. Cecchi Pestellini, F. Chiappetta, I. Coco, S. Colombo, G. Consolini, R. D'Amicis, G. De Gasperis, R. De Marco, A. Del Corpo, P. Diego, V. Di Felice, L. Di Fino, C. Di Geronimo, F. Faldi, F. Ferrente, C. Feruglio, E. Fiandrini, F. Fiore, R. Foldes, V. Formato, G. Francisco, F. Giannattasio, M. Giardino, P. Giobbi, L. Giovannelli, M. Giusti, A. Gorgi, B. Heilig, G. Iafrate, S. L. Ivanovski, G. Jerse, M. B. Korsos, F. Lepreti, D. Locci, C. Magnafico, V. Mangano, M. F. Marcucci, M. Martucci, S. Massetti, G. Micela, A. Milillo, R. Miteva, M. Molinaro, R. Mugatwala, A. Mura, G. Napoletano, L. Narici, C. Neubuser, G. Nistico, M. Pauluzzi, A. Perfetti, S. Perri, A. Petralia, M. Pezzopane, M. Piersanti, E. Pietropaolo, A. Pignalberi, C. Plainaki, G. Polenta, L. Primavera, G. Romoli, M. Rossi, L. Santarelli, G. Santi Amantini, F. Siciliano, G. Sindoni, S. Spadoni, R. Sparvoli, M. Stumpo, N. Tomassetti, R. Tozzi, V. Vagelli, N. Vasantharaju, A. Vecchio, M. Vellante, S. Vernetto, C. Vigorito, M. J. West, G. Zimbardo, P. Zucca, F. Zuccarello, P. Zuccon
Summary: This paper presents the CAESAR project, which aims to tackle the relevant aspects of Space Weather (SWE) science and develop a prototype of the scientific data centre for Space Weather of the Italian Space Agency (ASI) called ASPIS. The project involves 10 Italian institutions as partners and a total of 92 researchers, investigating the whole chain of phenomena from the Sun to Earth up to planetary environments in a multidisciplinary and comprehensive way. The ASPIS prototype will unify multiple SWE resources through a flexible and adaptable architecture, integrating currently available international SWE assets to advance forecasting capabilities.
Article
Astronomy & Astrophysics
M. Martucci, R. Ammendola, D. Badoni, S. Bartocci, R. Battiston, S. Beole, W. J. Burger, D. Campana, G. Castellini, P. Cipollone, S. Coli, L. Conti, A. Contin, M. Cristoforetti, G. D'Angelo, C. De Donato, C. De Santis, A. Di Luca, F. M. Follega, G. Gebbia, R. Iuppa, A. Lega, M. Lolli, N. Marcelli, G. Masciantonio, M. Merge, M. Mese, C. Neubuser, F. Nozzoli, A. Oliva, G. Osteria, L. Pacini, F. Palma, F. Palmonari, B. Panico, A. Parmentier, S. Perciballi, F. Perfetto, P. Picozza, M. Pozzato, G. M. Rebustini, E. Ricci, M. Ricci, S. B. Ricciarini, U. Savino, Z. Sahnoun, V. Scotti, A. Sotgiu, R. Sparvoli, P. Ubertini, V. Vilona, V. Vitale, S. Zoffoli, P. Zuccon, O. P. M. Aslam, M. D. Ngobeni, M. S. Potgieter
Summary: Time-dependent energy spectra of galactic cosmic rays are heavily affected by the solar wind and the solar magnetic field, resulting in a phenomenon called solar modulation. This paper presents the first spectra of galactic protons measured by the HEPD-01 instrument on the CSES-01 satellite from 2018 to 2022, providing valuable information for understanding the propagation of cosmic rays in the heliosphere.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
R. Battiston, C. Neubuser, F. M. Follega, R. Iuppa, V. Vitale, R. Ammendola, D. Badoni, S. Bartocci, A. Bazzano, S. Beole, I. Bertello, W. J. Burger, D. Campana, A. Cicone, P. Cipollone, S. Coli, L. Conti, A. Contin, M. Cristoforetti, G. D'Angelo, F. De Angelis, C. De Donato, C. De Santis, P. Diego, A. Di Luca, E. Fiorenza, G. Gebbia, A. Lega, M. Lolli, B. Martino, M. Martucci, G. Masciantonio, M. Merge, M. Mese, A. Morbidini, F. Nuccilli, F. Nozzoli, A. Oliva, G. Osteria, E. Papini, F. Palma, F. Palmonari, A. Parmentier, B. Panico, S. Perciballi, F. Perfetto, A. Perinelli, P. Picozza, M. Piersanti, M. Pozzato, G. Rebustini, D. Recchiuti, E. Ricci, M. Ricci, J. Rodi, A. Russi, S. B. Ricciarini, Z. Sahnoun, U. Savino, V. Scotti, X. Shen, A. Sotgiu, R. Sparvoli, S. Tofani, P. Ubertini, N. Vertolli, V. Vilona, U. Zannoni, Z. Zeren, S. Zoffoli, P. Zuccon
Summary: High-energy, long gamma-ray bursts (GRBs) can be exceptionally bright when they happen in the close-by universe, such as the recent GRB221009A with a redshift of 0.152. This event, observed by many gamma-ray space experiments, was accompanied by sudden electron flux changes measured by the HEPP-L charged particle detector on a satellite orbiting over Europe. The observed electron flux closely matched the time dependence of the photon flux associated with the main emission of the GRB.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Andrei E. Egorov
Summary: This study derived robust constraints on annihilating weakly interacting massive particle (WIMP) parameters based on new radio observations and dark matter distribution studies of M31. The obtained constraints exclude thermal WIMPs with lighter masses for specific annihilation channels and provide competitive results compared to other observations. The study also suggests that the explanation of the gamma-ray outer halo of M31 and the Galactic Center excess by annihilating dark matter is not excluded. The results indicate that a thermal WIMP with a mass of approximately 70 GeV could contribute significantly to nonthermal radio flux in M31 nucleus.
