Bibcode
MAGIC Collaboration; Acciari, V. A.; Ansoldi, S.; Antonelli, L. A.; Arbet Engels, A.; Arcaro, C.; Baack, D.; Babić, A.; Banerjee, B.; Bangale, P.; Barres de Almeida, U.; Barrio, J. A.; Becerra González, J.; Bednarek, W.; Bernardini, E.; Berti, A.; Besenrieder, J.; Bhattacharyya, W.; Bigongiari, C.; Biland, A.; Blanch, O.; Bonnoli, G.; Carosi, R.; Ceribella, G.; Chatterjee, A.; Colak, S. M.; Colin, P.; Colombo, E.; Contreras, J. L.; Cortina, J.; Covino, S.; Cumani, P.; D'Elia, V.; Da Vela, P.; Dazzi, F.; De Angelis, A.; De Lotto, B.; Delfino, M.; Delgado, J.; Di Pierro, F.; Domínguez, A.; Dominis Prester, D.; Dorner, D.; Doro, M.; Einecke, S.; Elsaesser, D.; Fallah Ramazani, V.; Fattorini, A.; Fernández-Barral, A.; Ferrara, G.; Fidalgo, D.; Foffano, L.; Fonseca, M. V.; Font, L.; Fruck, C.; Gallozzi, S.; García López, R. J.; Garczarczyk, M.; Gaug, M.; Giammaria, P.; Godinović, N.; Guberman, D.; Hadasch, D.; Hahn, A.; Hassan, T.; Herrera, J.; Hoang, J.; Hrupec, D.; Inoue, S.; Ishio, K.; Iwamura, Y.; Kubo, H.; Kushida, J.; Kuveždić, D.; Lamastra, A.; Lelas, D.; Leone, F.; Lindfors, E.; Lombardi, S.; Longo, F.; López, M.; López-Oramas, A.; Maggio, C.; Majumdar, P.; Makariev, M.; Maneva, G.; Manganaro, M.; Mannheim, K.; Maraschi, L.; Mariotti, M.; Martínez, M.; Masuda, S.; Mazin, D.; Minev, M.; Miranda, J. M.; Mirzoyan, R.; Molina, E.; Moralejo, A.; Moreno, V.; Moretti, E. et al.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 481, Issue 2, p.2479-2486
Advertised on:
12
2018
Citations
43
Refereed citations
33
Description
Fast radio bursts (FRBs) are bright flashes observed typically at GHz
frequencies with millisecond duration, whose origin is likely
extragalactic. Their nature remains mysterious, motivating searches for
counterparts at other wavelengths. FRB 121102 is so far the only source
known to repeatedly emit FRBs and is associated with a host galaxy at
redshift z ≃ 0.193. We conducted simultaneous observations of FRB
121102 with the Arecibo and MAGIC telescopes during several epochs in
2016-2017. This allowed searches for millisecond time-scale burst
emission in very-high-energy (VHE) gamma-rays as well as the optical
band. While a total of five FRBs were detected during these
observations, no VHE emission was detected, neither of a persistent
nature nor burst-like associated with the FRBs. The average integral
flux upper limits above 100 GeV at 95 per cent confidence level are 6.6
× 10-12 photons cm-2 s-1
(corresponding to luminosity LVHE ≲ 1045 erg
s-1) over the entire observation period, and 1.2 ×
10-7 photons cm-2 s-1 (LVHE
≲ 1049 erg s-1) over the total duration of
the five FRBs. We constrain the optical U-band flux to be below 8.6 mJy
at 5σ level for 1-ms intervals around the FRB arrival times. A
bright burst with U-band flux 29 mJy and duration ˜12 ms was
detected 4.3 s before the arrival of one FRB. However, the probability
of spuriously detecting such a signal within the sampled time space is
1.5 per cent (2.2, post-trial), i.e. consistent with the expected
background. We discuss the implications of the obtained upper limits for
constraining FRB models.
Related projects
Particle Astrophysics
The MAGIC Collaboration is integrated by 20 research institutes and university departments from Armenia, Bulgaria, Finland, Germany, Italy, Poland, Spain, Switzerland and USA. The collaboration comprises two 17m diameter telescopes, located at the Roque de los Muchachos Observatory, designed to measure the Cherenkov radiation associated with
Ramón
García López
Variability in Active Galactic Nuclei: Multifrecuency Studies
Active Galactic Nuclei (AGN) are characterized by a strong emission coming from a very compact region (only few pcs) at the galaxy center. Blazars form a class of AGN, characterized by high luminosity in a broad frequency range, from radiofrequencies to high energies (X-rays and γ -rays), as well as extreme variability and high polarization at
José Antonio
Acosta Pulido