LS I +61 303

Observation Date (UT)	Observation Lat
	ARGO-YBJ (30.11) ASTRI Mini-Array (28.3) CANGAROO (-31.10 ) CAT (42.50) Crimea (45) CTA pSCT (31.68) CTA South (-24.6272) Durham (-30.48) FACT (28.76) H.E.S.S. (-23.16) HAGAR (30) HAWC (19.0) HEGRA (28.76) LHAASO (29.358) LST-1 (28.76) MACE (32.78) MAGIC (28.76) Milagro (35.88 ) Potchefstroom (-26.9) TACTIC (24.6) TAIGA (103.07) Telescope Array (39.3) Tibet (30.11) VERITAS (31.68) Whipple (31.68)

Canonical Name:	LS I +61 303
TeVCat Name:	TeV J0240+612
Other Names:
Source Type:	Binary
R.A.:	02 40 34 (hh mm ss)
Dec.:	+61 15 25 (dd mm ss)
Gal Long:	135.67 (deg)
Gal Lat:	1.11 (deg)
Distance:	2 kpc
Flux:	0.16 (Crab Units)
Energy Threshold:	400 GeV
Spectral Index:
Extended:	No
Discovery Date:	2006-06
Discovered By:	MAGIC
TeVCat SubCat:	Default Catalog

Source Notes:

Period:
From Wu et al. (2017):
- "We conducted multi-epoch VLBA phase reference observations of
LS I +61 303 in order to study its precessing radio jet. Compared to
similar observations in 2006, we find that the observed elliptical
trajectory of emission at 8.4 GHz repeats after the 9-year gap. The
accurate alignment of the emission patterns yields a precession period
of 26.926 +/- 0.005 d, which is consistent with that determined by
Lomb-Scargle analysis of the radio light curve."
- "A Lomb-Scargle timing analysis of 36.8-yr radio observations
(Massi & Torricelli-Ciamponi 2016) confirmed previous discoveries
(e.g., Massi et al. 2015) of two characteristic periods:
P1 = 26.496 +/- 0.013 d and
P2 = 26.935 +/- 0.013 d,
in the emission from LS I +61 303"
- "The period P1 corresponds to orbital periodicity (Gregory 2002)."
- "The second feature in the spectrum, at P2 = 26.935 +/- 0.013 d, was
more challenging to understand. The simplest explanation is that the
observed flux density from a relativistic jet (Mirabel & Rodriguez 1999)
is the product of an intrinsically variable jet and Doppler boosting
toward the observer"

Source position and its uncertainty:
From Albert et al.(2006):
- RA (J2000): 2h40m34s
- Dec (J2000): 61d15'25"
- uncertainties: +/- 0.4'(stat) +/- 2'(syst)
From Acciari et al.(2008):
- RA (J2000): 2h40m41s +/- 73"(stat) (=4.9s)
- Dec (J2000): 61d13'12" +/- 30"(stat)
- The systematic uncertainty is +/- 90"

Flux:
The flux from this source has been found to be variable and to
reach a maximum at different phases of the orbit during different
observational campagins (see References)

From Massi et al. (2020):
- this paper discusses an observing campaign that took place to get
simultaneous observations of this system during one single orbit:
- "... the existing multiwavelength data are not simultaneous. In this
paper, we report the results of a campaign covering radio, X-ray, and
gamma-ray observations of the system along one single orbit. Our
results confirm the two predicted events along the orbit and in
addition show that the positions of radio and gamma-ray peaks are
coincident with X-ray dips as expected for radio and gamma-ray
emitting ejections depleting the X-ray emitting accretion flow."

From VERITAS Collaboration (2016):
- Flux: 30% Crab Nebula
- "... bright TeV flares around apastron at flux levels peaking above
30% of the Crab Nebula flux were detected. This is the brightest such
activity from this source ever seen in the TeV regime. The strong
outbursts have rise and fall times of less than a day. The short
timescale of the flares, in conjunction with the observation of 10 TeV
photons from LS I +61 303 during the flares, provides constraints on
the properties of the accelerator in the source."

From O'Faolain de Bhroithe et al. (2015):
- Flux: 25% Crab Nebula
- "VERITAS, detected exceptionally bright flares from LS I 303 during
the period October-December 2014"

From Aleksic et al. (2012):
- Flux: 1.3% Crab Nebula
From Acciari et al. (2011):
- Flux: 5% Crab Nebula
From Acciari et al. (2008):
- Flux: 15%-20% Crab Nebula
From Albert et al. (2006):
- Flux: 16% Crab Nebula

Spectral Properties:
From Ahnen et al. (2016):
- Spectral index for orbital interval 0.6-0.8 in 2011: 2.2 +/- 0.1(stat) +/- 0.2(syst)
- Spectral index for orbital interval 0.7 in 2012: 2.7 +/- 0.5(stat) +/- 0.2(syst)
- Spectral index for orbital interval 0.5-0.8 in 2011: 2.5 +/- 0.5(stat) +/- 0.2(syst)
- Spectral index for orbital interval 0.5-0.8 in 2011: 2.5 +/- 0.1(stat) +/- 0.2(syst)
From Aleksic et al. (2012):
- Spectral index for orbital interval 0.6-0.8 in 2009-2010: 2.5 +/- 0.5(stat) +/- 0.2(syst)
From Anderhub et al. (2009):
- Spectral index for orbital interval 0.6-0.7 in 2007: 2.7 +/- 0.3(stat) +/- 0.2(syst)
From Albert et al. (2009):
- Spectral index for orbital interval 0.5-0.6 in 2006: 2.7 +/- 0.4(stat) +/- 0.2(syst)
- Spectral index for orbital interval 0.6-0.7 in 2006: 2.6 +/- 0.3(stat) +/- 0.8(syst)
From Acciari et al. (2008):
- Spectral index for orbital interval 0.5-0.8 in 2006: 2.40 +/- 0.16(stat) +/- 0.2(sys)
From Albert et al. (2006):
- Spectral index for orbital interval 0.4-0.7 in 2006: 2.6 +/- 0.2(stat) +/-0.2(syst)


Seen by: MAGIC, VERITAS

• PeV proton acceleration in Gamma-ray Binaries
  Bykov, A.M. et al., arXiv e-prints parXiv:2401.06271 (2024) [LINK]
  
• Historical Fermi All-Sky Variability Analysis of Galactic Flares
  Joffre, Scott D. et al., arXiv e-prints parXiv:2402.07994 (2024) [LINK]
  
• Owens Valley Radio Observatory monitoring of LS I +61 303 completes three cycles of the super-orbital modulation
  Jaron, F. et al., A&A 683 pA228 (2024) [LINK]
  
• Energy-dependent periodicities of LS I +61 303 in the GeV band
  Chernyakova, M. et al., arXiv e-prints parXiv:2306.05954 (2023) [LINK]
  
• Rapid X-ray variability of the gamma-ray binary LS I +61 303
  L�pez-Miralles, J. et al., MNRAS p (2023) [LINK]
  
• Radio pulsations from a neutron star within the gamma-ray binary LS I +61 303
  Weng, Shan-Shan et al., arXiv e-prints parXiv:2203.09423 (2022) [LINK]
  
• Optical microflares in LS I +61 303 and the search for their multiwavelength counterpart
  Mestre, Enrique et al., arXiv e-prints parXiv:2205.05380 (2022) [LINK]
  
• An update on Fermi-LAT transients in the Galactic plane, including strong activity of Cygnus X-3 in mid-2020
  Prokhorov, Dmitry and Moraghan, Anthony, arXiv e-prints parXiv:2209.12461 (2022) [LINK]
  
• Does the gamma-ray binary LS I +61 303 harbour a magnetar?
  Suvorov, Arthur G. and Glampedakis, Kostas, arXiv e-prints parXiv:2210.09471 (2022) [LINK]
  
• 3D RMHD simulations of the Gamma-ray binaries
  Barkov, Maxim V. et al., arXiv e-prints parXiv:2211.12053 (2022) [LINK]
  
• Relativistic fluid modelling of gamma-ray binaries. I. The model
  Huber, D. et al., A&A 646 pA91 (2021) [LINK]
  
• Very High-energy Gamma-ray Emission from LS I +61 303 Binary
  Kieda, D.B. on behalf of the VERITAS Collaboration, arXiv e-prints parXiv:2108.09235 (2021) [LINK]
  
• A Precessing Jet Scenario for the Multi-Wavelength Long-Term Modulation of LS I +61 303
  Jaron, Frederic, Universe 7 p245 (2021) [LINK]
  
• Modelling the correlated keV/TeV light curves of Be/gamma-ray binaries
  Chen, A.M. and Takata, J., arXiv e-prints parXiv:2112.00345 (2021) [LINK]
  
• Gamma-ray binaries
  Chernyakova, Maria and Malyshev, Denys, arXiv e-prints parXiv:2006.03615 (2020) [LINK]
  
• Orbital variability of the optical linear polarization of the gamma-ray binary LS I +61 303 and new constraints on the orbital parameters
  Kravtsov, Vadim et al., arXiv e-prints parXiv:2010.00999 (2020) [LINK]
  
• Evidence for periodic accretion-ejection in LSI+61303
  Massi, M. et al., arXiv e-prints parXiv:2010.08598 (2020) [LINK]
  
• Radio/X-ray correlations and variability in the X-ray binary LS I +61 303
  Sharma, R. et al., arXiv e-prints parXiv:2011.13530 (2020) [LINK]
  
• Characterizing the VHE emission of LS I +61 303 using VERITAS observations
  Kieda, D.B. and the VERITAS Collaboration, arXiv e-prints parXiv:1908.03111 (2019) [LINK]
  
• Hour time-scale QPOs in the X-ray and radio emission of LS I +61 303
  Nosel, S. et al., ArXiv e-prints p (2018) [LINK]
  
• Simultaneous long-term monitoring of LS I +61 303 by OVRO and Fermi-LAT
  Jaron, F. et al., ArXiv e-prints p (2018) [LINK]
  
• VHE observations of binary systems performed with the MAGIC telescopes
  Lopez-Oramas, A. et al., ArXiv e-prints p (2018) [LINK]
  
• Mass of the compact object in the Be/gamma-ray binaries LSI+61303 and MWC 148
  Zamanov, R.K. et al., ArXiv e-prints p (2017) [LINK]
  
• The Black Hole Candidate LSI+61303
  Massi, M. et al., ArXiv e-prints p (2017) [LINK]
  
• Superorbital modulation at GeV energies in the gamma-ray binary LS I +61 303
  Xing, Y. et al., ArXiv e-prints p (2017) [LINK]
  
• Study of orbital and superorbital variability of LSI +61 303 with X-ray data
  Chernyakova, M. et al., ArXiv e-prints p (2017) [LINK]
  
• Radio QPO in the gamma-ray-loud X-ray binary LS I +61 303
  Jaron, F. et al., ArXiv e-prints p (2017) [LINK]
  
• MAGIC VHE Gamma-Ray Observations Of Binary Systems
  Hadasch, D. et al., ArXiv e-prints p (2017) [LINK]
  
• Review on the multiwavelength emission of the gamma-ray binary LS I +61 303
  Marcote, B., ArXiv e-prints p (2017) [LINK]
  
• Uncovering the identities of compact objects in high-mass X-ray binaries and gamma-ray binaries by astrometric measurements
  Yamaguchi, M.S. et al., ArXiv e-prints p (2017) [LINK]
  
• Revisiting LS I +61 303 with VLBI astrometry
  Wu, Y.W. et al., ArXiv e-prints p (2017) [LINK]
  
• Exceptionally bright TeV flares from the binary LS I +61 303
  VERITAS Collaboration et al., ArXiv e-prints p (2016) [LINK]
  
• Temporal features of LS I +61 303 in hard X-rays from the Swift/BAT survey data
  D'Ai, A. et al., MNRAS 456 p1955-1959 (2016) [LINK]
  
• Super-orbital variability of LS I +61 303 at TeV energies
  MAGIC Collaboration et al., ArXiv e-prints p (2016) [LINK]
  
• The Multi-wavelength Characteristics of the TeV Binary LS I +61 303
  Saha, L. et al., ArXiv e-prints p (2016) [LINK]
  
• Non-thermal emission from high-energy binaries through interferometric radio observations
  Marcote, B., ArXiv e-prints p (2016) [LINK]
  
• Spectral lags of flaring events in LSI +61 303 from RXTE Observations
  Sarkar, T. et al., ArXiv e-prints p (2016) [LINK]
  
• Optical spectroscopy of Be/gamma-ray binaries
  Zamanov, R.K. et al., ArXiv e-prints p (2016) [LINK]
  
• Understanding the periodicities in radio and GeV emission from LS I+61303
  Jaron, F. et al., ArXiv e-prints p (2016) [LINK]
  
• Evidence of coupling between the thermal and nonthermal emission in the gamma-ray binary LS I +61 303
  Paredes-Fortuny, X. et al., ArXiv e-prints p (2015) [LINK]
  
• Long-term OVRO monitoring of LSI+61 303: confirmation of the two close periodicities
  Massi, M. et al., ArXiv e-prints p (2015) [LINK]
  
• The apparent discontinuity in the periodicity of the GeV emission from LS I +61 303
  Jaron, F. and Massi, M., ArXiv e-prints p (2015) [LINK]
  
• VERITAS observations of exceptionally bright TeV flares from LS I +61 303
  O'Faolain de Bhroithe, A. and VERITAS collaboration, ArXiv e-prints p (2015) [LINK]
  
• VERITAS monitoring of LS I +61 303 in conjunction with X-ray, and GeV observation campaigns
  Kar, P. and for The VERITAS Collaboration, ArXiv e-prints p (2015) [LINK]
  
• VHE gamma-ray observations of transient and variable stellar objects with the MAGIC Telescopes
  Fernandez-Barral et al., ArXiv e-prints p (2015) [LINK]
  
• Orbital and superorbital variability of LS I +61 303 at low radio frequencies with GMRT and LOFAR
  Marcote, B. et al., ArXiv e-prints p (2015) [LINK]
  
• VERITAS Detection of Historically Bright TeV Flares From LS I +61 303
  Holder, J., The Astronomer's Telegram 6785 p1 (2014) [LINK]
  
• Discovery of a periodical apoastron GeV peak in LS I +61 303
  Jaron, F. and Massi, M., A&A 572 pA105 (2014) [LINK]
  
• INTEGRAL & RXTE View of Gamma-ray Binaries
  Li, J. et al., ArXiv e-prints p (2013) [LINK]
  
• Long-term periodicity in LSI+61303 as beat frequency between orbital and precessional rate
  Massi, M. and Jaron, F., ArXiv e-prints p (2013) [LINK]
  
• Periodic radio morphology of gamma-ray binaries
  Moldon, J. et al., ArXiv e-prints p (2013) [LINK]
  
• Associating long-term gamma-ray variability with the superorbital period of LS I 61 303
  The Fermi-LAT Collaboration, ArXiv e-prints p (2013) [LINK]
  
• VERITAS Observations of TeV Binaries
  Andrew W.Smith for the VERITAS Collaboration, ArXiv e-prints p (2013) [LINK]
  
• Gamma-ray binaries and related systems
  Dubus, G., ArXiv e-prints p (2013) [LINK]
  
• H-alpha observations of the gamma-ray-emitting Be/X-ray binary LSI+61303: orbital modulation, disk truncation, and long-term variability
  Zamanov, R. et al., ArXiv e-prints p (2013) [LINK]
  
• Multiwavelength Observations of The TeV Binary LS I +61 303 with VERITAS, Fermi-LAT and Swift-XRT During a TeV Outburst
  Aliu, E. et al., ArXiv e-prints p (2013) [LINK]
  
• Observations of VHE gamma-ray binaries with the MAGIC Telescopes
  Lopez-Oramas, A. et al., ArXiv e-prints p (2013) [LINK]
  
• Connection between orbital modulation of H-alpha and gamma-rays in the Be/X-ray binary LSI+61303
  Zamanov, R. et al., ArXiv e-prints p (2013) [LINK]
  
• Long-term monitoring of the high-energy gamma-ray emission from LS I +61 303 and LS 5039
  Hadasch, D. et al., ArXiv e-prints p (2012) [LINK]
  
• Superorbital Modulation of X-Ray Emission from Gamma-Ray Binary LSI +61 303
  Chernyakova, M. et al., ApJ 747 pL29 (2012) [LINK]
  
• VLBA images of the precessing jet of LSI+61303
  Massi, M. et al., ArXiv e-prints p (2012) [LINK]
  
• Unveiling the super-orbital modulation of LSI +61 303 in X-rays
  Li, J. et al., ArXiv e-prints p (2012) [LINK]
  
• Search for radio pulsations in LS I +61 303
  Canellas, A. et al., A&A 543 pA122 (2012) [LINK]
  
• Microblazar properties of LSI+61303
  Massi, M. et al., ArXiv e-prints p (2012) [LINK]
  
• Core-shift and precession in the jet of LSI+61303
  Massi, M. et al., ArXiv e-prints p (2012) [LINK]
  
• Unraveling the high energy emission components of gamma-ray binaries
  Zabalza, V. et al., ArXiv e-prints p (2012) [LINK]
  
• Observation of binary systems at very-high energies with VERITAS
  Maier, G. and VERITAS Collaboration, 1505 p362-365 (2012) [LINK]
  
• Gamma-ray binaries: microquasars and binary systems with pulsar
  Paredes, J.M., ArXiv e-prints p (2011) [LINK]
  
• Gamma ray attenuation in X-ray binaries: An application to LSI +61 303
  Nunez, P.D. et al., ArXiv e-prints p (2011) [LINK]
  
• Long-term X-ray monitoring of LS I +61 303: analysis of spectral variability and flares
  Li, J. et al., ArXiv e-prints p (2011) [LINK]
  
• A model for the two component gamma-ray spectra observed from the gamma-ray binaries
  Bednarek, W., ArXiv e-prints p (2011) [LINK]
  
• A magnetar-like event from LS I +61 303 and its nature as a gamma-ray binary
  Torres, D.F. et al., ArXiv e-prints p (2011) [LINK]
  
• Detection of LS I +61 303 in a low VHE gamma-ray emission state with the MAGIC telescopes
  Jogler, T. and O.Blanch for the MAGIC collaboration, ArXiv e-prints p (2011) [LINK]
  
• Using H-alpha as a Tracer of the Emission Region of LS I +61 303
  McSwain, M.V., ArXiv e-prints p (2011) [LINK]
  
• Results from the binaries LS I +61 303 and LS 5039 after 2.5 years of Fermi monitoring
  Hadasch, D. and for the Fermi-LAT collaboration, ArXiv e-prints p (2011) [LINK]
  
• VHE Observations of Galactic binary systems with VERITAS
  Maier, G. et al., ArXiv e-prints p (2011) [LINK]
  
• Analysis of hard X-ray/high energy data from LS I +61 303 based on implications from its 4.6 yr periodicity
  Zimmermann, L. et al., ArXiv e-prints p (2011) [LINK]
  
• Detection of the gamma-ray binary LS I +61 303 in a low flux state at Very High Energy gamma-rays with the MAGIC Telescopes in 2009
  MAGIC Collaboration et al., ArXiv e-prints p (2011) [LINK]
  
• VERITAS Observations of the TeV Binary LS I +61 303 During 2008-2010
  Acciari, V.A. et al., ApJ 738 p3 (2011) [LINK]
  
• Tracing colliding winds in the UV line orbital variability of gamma-ray binaries
  Szostek, A. et al., ArXiv e-prints p (2011) [LINK]
  
• Unveiling the super-orbital modulation of LS I +61 303 in X-rays
  Li, J. et al., ArXiv e-prints p (2011) [LINK]
  
• Implications of the radio spectral index transition in LS I +61 303 for its INTEGRAL data analysis
  Zimmermann, L. and Massi, M., ArXiv e-prints p (2011) [LINK]
  
• Relativistic Doppler-boosted emission in gamma-ray binaries
  Dubus, G. et al., ArXiv e-prints p (2010) [LINK]
  
• Microquasars in the GeV-TeV era
  Paredes, J.M. and Zabalza, V., ArXiv e-prints p (2010) [LINK]
  
• Deep Chandra observations of TeV binaries I: LSI +61 303
  Rea, N. et al., ArXiv e-prints p (2010) [LINK]
  
• Feasibility Study of Lense-Thirring Precession in LS I +61303
  Massi, M. and Zimmermann, L., ArXiv e-prints p (2010) [LINK]
  
• Long-term monitoring of LS I+61303 with INTEGRAL
  Zhang, S. et al., ArXiv e-prints p (2010) [LINK]
  
• Variability in the orbital profiles of the X-ray emission of the gamma-ray binary LS I +61 303
  Torres, D.F. et al., ArXiv e-prints p (2010) [LINK]
  
• Gamma-ray binaries as non-accreting pulsar systems
  Torres, D.F., ArXiv e-prints p (2010) [LINK]
  
• On the origin of correlated X-ray/VHE emission from LS I +61 303
  Zabalza, V. et al., ArXiv e-prints p (2010) [LINK]
  
• Search for a neutrino flux from LS I +61 303 based on a time dependent model with IceCube
  Levent Demirors for the IceCube Collaboration, ArXiv e-prints p (2010) [LINK]
  
• VERITAS Detects VHE Gamma-Ray Emission from LS I +61 303 Near Periastron
  Ong, R.A., The Astronomer's Telegram 2948 p1-+ (2010) [LINK]
  
• Multiwavelength Observations of LS I +61 303 with VERITAS, Swift and RXTE
  VERITAS Collaboration:V.A.~Acciari et al., ArXiv e-prints p (2009) [LINK]
  
• TeV Gamma-rays from accreting magnetars in massive binaries
  Bednarek, W., ArXiv e-prints p (2009) [LINK]
  
• The Orbits of the Gamma-ray Binaries LS I +61 303 and LS 5039
  Aragona, Christina and others, p (2009) [LINK]
  
• High-energy emission from jet-clump interactions in microquasars
  Araudo, A.T. et al., ArXiv e-prints p (2009) [LINK]
  
• Correlated X-ray and Very High Energy emission in the gamma-ray binary LS I +61 303
  The MAGIC Collaboration: H.Anderhub et al., ArXiv e-prints p (2009) [LINK]
  
• Non-thermal emission from secondary pairs in close TeV binary systems
  Bosch-Ramon, V. et al., ArXiv e-prints 801 p (2008) [LINK]
  
• VERITAS Observations of the gamma-Ray Binary LS I +61 303
  Acciari, V.A. et al., ArXiv e-prints 802 p (2008) [LINK]
  
• On the X-ray/TeV connection in Galactic jet sources
  Bosch-Ramon, V. et al., ArXiv e-prints 805 p (2008) [LINK]
  
• The physics of non-thermal radiation in microquasars
  Bosch-Ramon, V., ArXiv e-prints 805 p (2008) [LINK]
  
• Periodic very high energy gamma-ray emission from LS I +61 303 observed with the MAGIC telescope
  MAGIC Collaboration: J.Albert, ArXiv e-prints 806 p (2008) [LINK]
  
• Spectral signature of a free pulsar wind in the gamma-ray binaries LS 5039 and LSI +61 303
  Cerutti, B. et al., A&A 488 p37-46 (2008) [LINK]
  
• On the magnetic field and the TeV emitter location in Cygnus X-1 and LS 5039
  Bosch-Ramon, V. et al., p (2008) [LINK]
  
• Long Term X-ray Monitoring Of The TeV Binary LS I +61 303 with RXTE
  Smith, A. et al., ArXiv e-prints 809 p (2008) [LINK]
  
• High-energy emission from microqusars
  Romero, G.E., ArXiv e-prints p (2008) [LINK]
  
• Gamma-ray emission from LS I +61 303: The impact of basic system uncertainties
  Sierpowska-Bartosik, A. and Torres, D.F., ArXiv e-prints p (2008) [LINK]
  
• Chandra Observations of the Gamma-Ray Binary LS I +61 303: Extended X-Ray Structure?
  Paredes, J.M. et al., ApJ 664 pL39-L42 (2007) [LINK]
  
• Variable Very-High-Energy Gamma-Ray Emission from the Microquasar LS I +61 303
  Albert, J. et al., Science 312 p1771-1773 (2006) [LINK]
  
• The radio to TeV orbital variability of the microquasar LS I +61 303
  Bosch-Ramon, V. et al., A&A 459 pL25-L28 (2006) [LINK]
  
• Gamma-ray binaries: pulsars in disguise?
  Dubus, G., A&A 456 p801-817 (2006) [LINK]
  
• Hints for a fast precessing relativistic radio jet in LS I +61 303
  Massi, M. et al., A&A 414 pL1-L4 (2004) [LINK]
  
• One-sided jet at milliarcsecond scales in LS I +61 303
  Massi, M. et al., A&A 376 p217-223 (2001) [LINK]
  
• Evidence of H-alpha periodicities in LS I+61 303
  Zamanov, R.K. et al., A&A 351 p543-550 (1999) [LINK]
  
• Evidence of X-ray periodicity in LSI+61 303.
  Paredes, J.M. et al., A&A 320 pL25-L28 (1997) [LINK]
  
• A model for LSI 61 303
  Maraschi, L. and Treves, A., MNRAS 194 p1P-5P (1981) [LINK]
  

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