Observation of Pulsed γ-Rays Above 25 GeV from the Crab Pulsar with MAGIC

@article{Aliu2008ObservationOP,
  title={Observation of Pulsed $\gamma$-Rays Above 25 GeV from the Crab Pulsar with MAGIC},
  author={Ester Aliu and H. Anderhub and Lucio Angelo Antonelli and P. Antoranz and Michael Backes and C. Baixeras and J. A. Barrio and Hendrik Bartko and Denis Bastieri and J. K. Becker and W. Bednarek and Karsten Berger and Elisa Bernardini and Ciro Bigongiari and Adrian Biland and R. K. Bock and G. Bonnoli and P. Bordas and Valenti Bosch-Ramon and Thomas Bretz and Ilia Britvitch and M. Camara and Emiliano Carmona and Ashot A. Chilingarian and Sebastian Commichau and J. L. Contreras and J. Cortina and M. T. Costado and Stefano Covino and Valentin Curtef and Francesco Dazzi and Alessandro De Angelis and Elsa de Cea del Pozo and Raquel De Los Reyes and B. De Lotto and Marcello De Maria and F. de Sabata and C. Delgado Mendez and Alberto Dom{\'i}nguez and Daniela Dorner and Michele Doro and D Els{\"a}sser and Manel Errando and Michela Fagiolini and Daniel Ferenc and Enrique Fern{\'a}ndez and Roger Firpo and M. Victoria Fonseca and Ll. Font and Nicola Galante and R. J. Garc{\'i}a L{\'o}pez and Markus Garczarczyk and Markus Gaug and Florian Goebel and D. Hadasch and Morihiro Hayashida and Ana Herrero and Daniel H{\"o}hne and Juergen Hose and C. C. Hsu and S. Huber and T. Jogler and Daniel Kranich and Aurelio La Barbera and A. Laille and Elvira Leonardo and Eila Lindfors and S. Lombardi and Francesco Longo and M. Rutz Lopez and Eckart Lorenz and Pratik Majumdar and Galina Maneva and Nijil Mankuzhiyil and Karl Mannheim and Laura Maraschi and Mose Mariotti and M. Mart{\'i}nez and D. Mazin and M. Meucci and Manuel Meyer and J. M. Miranda and Razmik Mirzoyan and Mariano Mol{\'e}s and A. Moralejo and D. Nieto and Kari Nilsson and Jelena Ninkovi{\'c} and N. Otte and I. Oya and Riccardo Paoletti and Josep Maria Paredes and Mikko Pasanen and Donatella Pascoli and Felicitas Pauss and R. G. Pegna and Miguel A. P{\'e}rez-Torres and Massimo Persic and Luigi Peruzzo and Alessio Piccioli and Francisco Prada and E. Prandini and Neus Puchades and A. Raymers and Wolfgang Rhode and Marc Rib{\'o} and Javier Rico and Michael Rissi and Anne Robert and Stefan R{\"u}gamer and Antonio Saggion and T. Saito and Marco Salvati and M. S{\'a}nchez-Conde and P. Sartori and Konstancja Satalecka and Villi Scalzotto and Valeria Scapin and Thomas Schweizer and Maxim Shayduk and Kenji Shinozaki and Steven N. Shore and N{\'u}ria Sidro and Agnieszka Sierpowska-Bartosik and Aimo Sillanp{\"a}{\"a} and D. Sobczynska and Felix Spanier and A. Stamerra and Luisa Sabrina Stark and Leo O. Takalo and Fabrizio Tavecchio and P. Temnikov and Diego Tescaro and Masahiro Teshima and Martin Tluczykont and Diego F. Torres and Nicola Turini and H. P. Vankov and Alessio Venturini and Vincenzo Vitale and R. Mark Wagner and Wolfgang Wittek and V'ictor Zabalza and Fabio Zandanel and Roberta Zanin and J. Zapatero and O. C. de Jager and Emma de O{\~n}a Wilhelmi},
  journal={Science},
  year={2008},
  volume={322},
  pages={1221 - 1224}
}
One fundamental question about pulsars concerns the mechanism of their pulsed electromagnetic emission. Measuring the high-end region of a pulsar's spectrum would shed light on this question. By developing a new electronic trigger, we lowered the threshold of the Major Atmospheric γ-ray Imaging Cherenkov (MAGIC) telescope to 25 giga–electron volts. In this configuration, we detected pulsed γ-rays from the Crab pulsar that were greater than 25 giga–electron volts, revealing a relatively high… 

Detection of Pulsed Gamma Rays Above 100 GeV from the Crab Pulsar

TLDR
This detection constrains the mechanism and emission region of gamma-ray radiation in the pulsar’s magnetosphere and requires that these gamma rays be produced more than 10 stellar radii from the neutron star.

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