Editing MAGIC (telescope) (section)

==Observations==
MAGIC has found pulsed gamma-rays at energies higher than 25&nbsp;GeV coming from the [[Crab Pulsar]].<ref>{{Cite journal | doi = 10.1126/science.1164718| title = Observation of Pulsed -Rays Above 25 GeV from the Crab Pulsar with MAGIC| journal = Science| volume = 322| issue = 5905| pages = 1221–1224| year = 2008| last1 = Aliu | first1 = E.| last2 = Anderhub | first2 = H.| last3 = Antonelli | first3 = L. A.| last4 = Antoranz | first4 = P.| last5 = Backes | first5 = M.| last6 = Baixeras | first6 = C.| last7 = Barrio | first7 = J. A.| last8 = Bartko | first8 = H.| last9 = Bastieri | first9 = D.| last10 = Becker | first10 = J. K.| last11 = Bednarek | first11 = W.| last12 = Berger | first12 = K.| last13 = Bernardini | first13 = E.| last14 = Bigongiari | first14 = C.| last15 = Biland | first15 = A.| last16 = Bock | first16 = R. K.| last17 = Bonnoli | first17 = G.| last18 = Bordas | first18 = P.| last19 = Bosch-Ramon | first19 = V.| last20 = Bretz | first20 = T.| last21 = Britvitch | first21 = I.| last22 = Camara | first22 = M.| last23 = Carmona | first23 = E.| last24 = Chilingarian | first24 = A.| last25 = Commichau | first25 = S.| last26 = Contreras | first26 = J. L.| last27 = Cortina | first27 = J.| last28 = Costado | first28 = M. T.| last29 = Covino | first29 = S.| last30 = Curtef | first30 = V.| display-authors = 29|arxiv = 0809.2998 |bibcode = 2008Sci...322.1221A | pmid=18927358| s2cid = 5387958}}</ref> The presence of such high energies indicates that the gamma-ray source is far out in the pulsar's [[magnetosphere]], in contradiction with many models.

In 2006 MAGIC detected<ref>{{Cite journal |last1=Albert |first1=J. |last2=Aliu |first2=E. |last3=Anderhub |first3=H. |last4=Antonelli |first4=L. A. |last5=Antoranz |first5=P. |last6=Backes |first6=M. |last7=Baixeras |first7=C. |last8=Barrio |first8=J. A. |last9=Bartko |first9=H. |last10=Bastieri |first10=D. |last11=Becker |first11=J. K. |display-authors=29 |date=2008-06-27 |year=2008 |title=Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent is the Universe? |journal=Science |volume=320 |issue=5884 |pages=1752–4 |arxiv=0807.2822 |bibcode=2008Sci...320.1752M |doi=10.1126/science.1157087 |pmid=18583607 |last12=Bednarek |first12=W. |last13=Berger |first13=K. |last14=Bernardini |first14=E. |last15=Bigongiari |first15=C. |last16=Biland |first16=A. |last17=Bock |first17=R. K. |last18=Bonnoli |first18=G. |last19=Bordas |first19=P. |last20=Bosch-Ramon |first20=V. |last21=Bretz |first21=T. |last22=Britvitch |first22=I. |last23=Camara |first23=M. |last24=Carmona |first24=E. |last25=Chilingarian |first25=A. |last26=Commichau |first26=S. |last27=Contreras |first27=J. L. |last28=Cortina |first28=J. |last29=Costado |first29=M. T. |last30=Covino |first30=S.|s2cid=16886668 }}</ref> very high energy cosmic rays from the [[quasar]] [[3C 279]], which is 5 billion light years from Earth. This doubles the previous record distance from which very high energy cosmic rays have been detected. The signal indicated that the universe is more transparent than previously thought based on data from optical and infrared telescopes.

MAGIC did not observe cosmic rays resulting from dark matter decays in the [[dwarf galaxy]] [[Draco Dwarf|Draco]].<ref>{{Cite journal | last1 = Albert | first1 = J. | last2 = Aliu | first2 = E. | last3 = Anderhub | first3 = H. | last4 = Antoranz | first4 = P. | last5 = Backes | first5 = M. | last6 = Baixeras | first6 = C. | last7 = Barrio | first7 = J. A. | last8 = Bartko | first8 = H. | last9 = Bastieri | first9 = D. | last10 = Becker | first10 = J. K. | last11 = Bednarek | first11 = W. | last12 = Berger | first12 = K. | last13 = Bigongiari | first13 = C. | last14 = Biland | first14 = A. | last15 = Bock | first15 = R. K. | last16 = Bordas | first16 = P. | last17 = Bosch‐Ramon | first17 = V. | last18 = Bretz | first18 = T. | last19 = Britvitch | first19 = I. | last20 = Camara | first20 = M. | last21 = Carmona | first21 = E. | last22 = Chilingarian | first22 = A. | last23 = Commichau | first23 = S. | last24 = Contreras | first24 = J. L. | last25 = Cortina | first25 = J. | last26 = Costado | first26 = M. T. | last27 = Curtef | first27 = V. | last28 = Danielyan | first28 = V. | last29 = Dazzi | first29 = F. | last30 = De Angelis | first30 = A. | display-authors = 1 | title = Upper Limit for γ‐Ray Emission above 140 GeV from the Dwarf Spheroidal Galaxy Draco | doi = 10.1086/529135 | journal = The Astrophysical Journal | volume = 679 | pages = 428–431 | year = 2008 | issue = 1 | bibcode=2008ApJ...679..428A
|arxiv = 0711.2574 | s2cid = 15324383 }}</ref> This strengthens the known constraints on dark matter models.

A much more controversial observation is an energy dependence in the speed of light of cosmic rays coming from a short burst of the [[blazar]] [[Markarian 501]] on July 9, 2005. Photons with energies between 1.2 and 10&nbsp;TeV arrived 4 minutes after those in a band between 0.25 and 0.6&nbsp;TeV. The average delay was 30&nbsp;±12 ms per GeV of energy of the photon. If the relation between the space velocity of a photon and [[photon energy|its energy]] is linear, then this translates into the fractional difference in the speed of light being equal to minus the photon's energy divided by 2×10<sup>17</sup> GeV. The researchers have suggested that the delay could be explained by the presence of [[quantum foam]], the irregular structure of which might slow down photons by minuscule amounts only detectable at cosmic distances such as in the case of the blazar.<ref>{{Cite journal |last1=Albert |first1=J. |last2=Ellis |first2=John |last3=Mavromatos |first3=N. E. |last4=Nanopoulos |first4=D. V. |last5=Sakharov |first5=A. S. |last6=Sarkisyan |first6=E. K. G. |date=2008 |title=Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope |journal=Physics Letters B |volume=668 |issue=4 |pages=253–257 |doi=10.1016/j.physletb.2008.08.053|arxiv=0708.2889 |bibcode=2008PhLB..668..253M |s2cid=5103618 }}</ref><ref>{{Cite web |last=Lee |first=Chris |date=2007-08-23 |title=Probing quantum gravity with gamma ray bursters |url=https://arstechnica.com/science/2007/08/probing-quantum-gravity-with-gamma-ray-bursters/ |access-date=2022-08-10 |website=Ars Technica |language=en-us}}</ref>