Status of the MAGIC Telescope Project Presented by Razmick Mirzoyan On behalf of the MAGIC Collaboration Max-Planck-Institute for Physics (Werner-Heisenberg-Institute) Munich, Germany

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India The MAGIC Collaboration ~ 150 physicists operating a 17 m i air Cherenkov Telescope for observation of HE cosmic  –rays. Main aim: measure  –ray sources in the unexplored energy range: 30 (10) 250 GeV Main aim: measure  –ray sources in the unexplored energy range: 30 (10)  250 GeV A challenging design to provide a very low energy threshold setting by using of large reflector of 236 m² area advanced optics, light sensors, ultra-fast electronics and 3 level trigger FADC readout (0.3  2) GSample/s Barcelona IFAE, Barcelona UAB, Crimean Observatory, U.C. Davis, U. Lodz, UCM Madrid, MPI Munich, INFN/ U. Padua, INFN/ U. Siena U. Humbold Berlin, Tuorla Observatory, Yerevan Phys. Institute, INFN/U. Udine, U. Würzburg, ETH Zürich, INR Sofia, Univ. Dortmund MAGIC: lasers of the Active Mirror Control system are switched ON Major Atmospheric Gamma-Ray Imaging Cherenkov Telescope

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India Chronology of the project First presentations in 1995, for example, 24 th ICRC, Rome, (Bradbury et al.) Design study: spring 1998 Approval of funding only late 2000 Start of construction in 2001 Inauguration October 10 th 2003 Comissioning until late summer 2004 Regular observations: early fall 2004

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India MAGIC: a pioneering telescope new threshold & technology standards The key elements are: 577 pixels, ~ 3.5° FOV camera577 pixels, ~ 3.5° FOV camera 3-level trigger system3-level trigger system Analogue signal optical transport via fibresAnalogue signal optical transport via fibres Carbon fibre frameCarbon fibre frameCarbon fibre frameCarbon fibre frame 17 m i reflector17 m i reflector Active mirror controlActive mirror control

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India Observed Sources 1ES hours 2E GRBs10 Arp GC10.6 Sgr A11.3 Mkn HESS ES M W Comae8.6 1H EG Crab Nebula83.1 IC Mkn TeV-L3+C6.7 1ES ES SGR EG EG C66A22.9 4C PSRB PSRB EG EG BL Lac0.6

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India Source Measurements: Crab Nebula The current trigger threshold of MAGIC is ~ 50 GeV. The lowest analysed energies are > 70 GeV. The sensitivity is currently well understood for energies > GeV. MAGIC can measure Crab with 5  in ~ 2 min. (Wagner et al. OG ).

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India Source Measurements: Mkn 421 Measure the low energy part of the spectrum towards 100 GeV, looking for a possible Inverse Compton peak Long term studies Long term studies Periodicity of flares Periodicity of flares Flux in low state Flux in low state Variations x 3 in 1 h on April 5 th 2005 (E > 300 GeV) (see Mazin et al. OG )

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India  distribution for data of July 1st Source Measurements: Mkn h ON Z.A.: 15°-25° Size > 360 ph.e. (E > 200 GeV)  cut < 6° Excess ev.: 648 Significance: 41 

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India Source Measurements: Mkn 501 Big flare on July 1 st Big flare on July 1 st Intensity ~ 4 Crab Intensity ~ 4 Crab New Quality in  Astronomy : New Quality in  Astronomy : Because of the very strong detection Because of the very strong detection we could follow the intensity we could follow the intensity variations in time bins of < 2 min. variations in time bins of < 2 min.

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India Source Measurements: 1ES – (see Tonello et al. OG ) Only statistical errors New energy domain explored

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India Source Measurements: Galactic Center 6.3  signal, 167 excess events 6.3  signal, 167 excess events SIZE > 600 ph.el., threshold ~1.4 TeV SIZE > 600 ph.el., threshold ~1.4 TeV ON/OFF (23 h data, June/July 2005), spectrum (2.3 ± 0.3) ON/OFF (23 h data, June/July 2005), spectrum (2.3 ± 0.3) Excess : (Ra,Dec)=(17 h 45’20’’, 29°2’), ±0.05° sys. error Excess : (Ra,Dec)=(17 h 45’20’’, –29°2’), ±0.05° sys. error Сompatible with point source (see Bartko et al. OG ) Сompatible with point source (see Bartko et al. OG )

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India Source Measurements: HESS J1813 Measured in June/July. In ~25 h wobble mode obtained ~ 10.6 σ signal. Above ~ 1TeV: 10% Crab flux, relatively hard spectrum with the diff. index of ( ). To our hard spectrum with the diff. index of (2.1 ± 0.3). To our knowledge it is the first time that the spectrum of this source is shown (see Bartko, et al., OG )

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India Source Measurements: GRBs NrGRB EventSatelliteGRB onset [UTC]  t alert [sec]  t observation [sec] Zenith distance Redshift 1.GRB050408HETE16:22:  GRB050421SWIFT04:11:  3.GRB050502SWIFT02:14:  GRB050505SWIFT23:22:  GRB050509ASWIFT01:46:  6.GRB050509BSWIFT04:00:  GRB050528SWIFT04:06:  8.GRB050713ASWIFT04:29:  MAGIC observation window GRB050713A On July 13 th we started to measure the GRB050713A just after 40 sec. after the burst was detected. (see Garczarczyk et al.) We are analyzing the GRB050713A data, no significant signal > 175 GeV

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India New Source Discovery: 1ES z  m V = 16.4, 407 min ON in January excess events, 5.9  signal (see Meyer et al OG )

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India Second Phase of the project: MAGIC-II MAGIC-II The second telescope, MAGIC-II, is already under the construction in La Palma, on 85m distance from the MAGIC-I. It is essentially a clone telescope with some improvements on the camera part (higher QE sensors). Scheduled to be completed in spring 2007 (see Teshima et al. OG )

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India Conclusions 1 MAGIC-I : regular data taking since early fall 2004 MAGIC-I : regular data taking since early fall 2004 Strong  ray signals from a number of sources measured, Strong  ray signals from a number of sources measured, spectra derived New extragalactic source at high redshift z=0.182 New extragalactic source at high redshift z=0.182 discovered ! Currently achieved best sensitivity (E  > GeV): Currently achieved best sensitivity (E  > GeV): Crab Nebula with 5  in ~ 2 min., 23 mCrab/50 h Crab Nebula with 5  in ~ 2 min., 23 mCrab/50 h So far a relatively low sensitivity has been achieved for So far a relatively low sensitivity has been achieved for E  > 70 GeV (triggering on ~50 GeV ) Working on improving sensitivity for E  < 100 GeV Working on improving sensitivity for E  < 100 GeV

3rd of August, 205R. Mirzoyan: Status of MAGIC, 29th ICRC, Pune, India Conclusions 2 A GRB has been measured just after 40s after its detection, yet no clear signal for E  > 175 GeV MAGIC-II is under construction, ready spring 2007 Coincident operation of the two telescopes will provide double sensitivity lower threshold setting. Happy source hunting has started !