Crab nebula

[References]

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           Hillas, A.M. et al., ApJ 503, 744 (1998)
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ASGAT: Goret, P. et al, A&A 270, 401 (1993)

Themistocle: Baillon, P. et al., Astropart. Phys. 1, 341 (1993)
                 Baillon, P. et al., Astropart. Phys. 5, 79 (1996)

CANGAROO-I: Tanimori, T. et al., ApJ 429, L61-64 (1994)
                     Tanimori, T. et al., ApJ 492, L33 (1998)

HEGRA: Konopelko, A. et al., Astroparticle Phys. 4, 199-215 (1996)
            Kohnle, A. et al., Astroparticle Phys. 5, 119 (1996)
            Kranich, D. et al, Astroparticle Phys. 12, 65 (1999)
            Ahanorian F. et al., A&A 346, 913 (1999)
            Aharonian, F.A. et al., A&A 361, 1073 (2000)
            Aharonian, F.A. et al., ApJ 539, 317 (2000)

Tibet AS-gamma: Amenomori, M. et al., ApJ 525, 93 (1999)
            Amenomori, M. et al., arXiv:0810.3757 [astro-ph]

STACEE: Oser, S. et al., ApJ 547, 949-958 (2001)

CELESTE: De Naurois, M. et al, ApJ 566, 343-357 (2002)

GRAAL: Arqueros, F. et al., Astroparticle Physics 17, 293-318 (2002)

Milagro: Atkins, R. et al., ApJ 595, 803-811 (2003)
           A.A. Abdo et al., ApJ, 664, L91-94 (2007)
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TACTIC: Tickoo, A.K. et al., Bulletin of the Astronomical Society of India 33, 389-389 (2005)

CANGAROO-III: R.Enomoto et al., ApJ 638, 397-408 (2006)

H.E.S.S.: F. Aharonian et al., Astron. Astrophys. 457, 899-915 (2006)
            B.Khelifi et al., 30th ICRC (2007) / arXiv:0710.4057 [astro-ph] p.26
            A.Abramowski et al., A&A, 562, L4 (2014)
            F.Aharonian et al., astro-ph:1909.0949 (2019) [Nebula size]

MAGIC: J. Albert et al., ApJ 674, 1037-1055 (2008)
           M. Teshima, ATel #1491 (28 April 2008) /
              E. Aliu, et al., Science 322, 1221 (2008) [pulsation]
           M. Lopez et al., arXiv:0907.0832 [astro-ph] [pulsation]
           J. Aleksic et al., arXiv:1108.5391 [astro-ph] [pulsation]
           T.Y. Saito et al., ICRC 2011 / arXiv:1109.6100 [astro-ph] [pulsation]
           J. Aleksic et al., arXiv:1109.6124 [astro-ph] [pulsation]
           R. Zanin et al., ICRC 2011 / arXiv:1110.2987 [astro-ph] [nebula spectrum]
           J. Aleksic et al., ApJ 742, 43 (2011)
           S. Klepser et al., TAUP 2011 / arXiv:1202.3008 [astro-ph] [pulsation]
           J. Aleksic et al., arXiv:1402.4219 [astro-ph] [bridge emission]
           J. Aleksic et al., arXiv:1406.6892 [astro-ph] [spectrum]
           T.Y. Saito et al., Fermi 2014 / arXiv:1502.02757 [astro-ph] [bridge emission]
           M.L. Ahnen et al., arXiv:1510.07048 [astro-ph] [pulsation]
           V.A. Acciari et al., arXiv:2001.09566 [astro-ph] [large zenith obs.]

VERITAS: O.Celik et al., 30th ICRC (2007) / arXiv:0709.3868 [astro-ph]
          E. Aliu et al., arXiv:1108.3797 [astro-ph] [pulsation]
          A. McCann et al., ICRC 2011 / arXiv:1110.4352 [astro-ph] [pulsation]
          A. Nepomuk Otte et al., TAUP2011 / arXiv:1208.2035 [pulsation]
          E. Aliu et al., ApJ, 781, L11 (2013) [2013 flare: no variation seen]

ARGO-YBJ: Z. Cao et al., ICRC 2011 / arXiv:1110.1809 [astro-ph]

HAWC: A.U. Abeysekara et al., arXiv:1701.01778 [astro-ph]
          A.U. Abeysekara et al., arXiv:1703.06968 [astro-ph]