Changeset 6162 for trunk/MagicSoft


Ignore:
Timestamp:
01/31/05 20:47:44 (20 years ago)
Author:
garcz
Message:
*** empty log message ***
Location:
trunk/MagicSoft/GRB-Proposal
Files:
2 edited

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  • trunk/MagicSoft/GRB-Proposal/GRB_proposal_2005.tex

    r6161 r6162  
    9696%------------------------------------------------------------
    9797
    98 \section{Calibrations}
    99 {\ldots \it \bf Crab data at different axis-offsets to calibrate off-axis sensitivity  \ldots \\}
    10098
    10199%%% BIBLIOGRAPHY %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
     
    167165\bibitem{KNEISKE} Kneiske T.M., Bretz T., Mannheim K., Hartmann D.H., A\&A 413, 807, 2004.
    168166\bibitem{GRB030329} Spectra of the burst: http://space.mit.edu/HETE/Bursts/GRB030329/
     167\bibitem{ecl} Private communication with Lorenz E.
    169168
    170169%Not used references
    171170
    172 \bibitem{PAZCYNSKI} Pazcy\'{n}ski B., Astrophys. J. 308 L43 (1986)
    173 \bibitem{GOODMAN} Goodman J., Astrophys. J. 308 L47 (1986)
    174 \bibitem{SARI} Sari R., Piran T., Narayan R., Astrophys. J. 497 L17 (1998)
    175 \bibitem{XU} Pazcy\'{n}ski B., Xu G., Astrophys. J. 427 708 (1994)
    176 \bibitem{REES} Rees M., Meszaros P., MNRAS 258 P41 (1992)
    177 \bibitem{MESZAROS94} Meszaros P., Rees M., MNRAS 289 L41 (1994)
     171%\bibitem{PAZCYNSKI} Pazcy\'{n}ski B., Astrophys. J. 308 L43 (1986)
     172%\bibitem{GOODMAN} Goodman J., Astrophys. J. 308 L47 (1986)
     173%\bibitem{SARI} Sari R., Piran T., Narayan R., Astrophys. J. 497 L17 (1998)
     174%\bibitem{XU} Pazcy\'{n}ski B., Xu G., Astrophys. J. 427 708 (1994)
     175%\bibitem{REES} Rees M., Meszaros P., MNRAS 258 P41 (1992)
     176%\bibitem{MESZAROS94} Meszaros P., Rees M., MNRAS 289 L41 (1994)
    178177
    179178
  • trunk/MagicSoft/GRB-Proposal/Strategies.tex

    r6161 r6162  
    5555$\theta_{max} = 70^\circ$ to $\theta_{max} = 65^\circ$.
    5656
     57\subsection{Active Mirror Control behaviour}
     58
     59To reduce the time before starting of the observation, the use of the look-up tables (LUTs) is necessary.
     60Once generated, the {\it AMC} will use the LUTs and automaticaly focus the panels for a given telescope position. The {\it CC} should send the burst coordinates to the {\it Drive} and the {\it AMC} software in the same time. In this way the panels could be focussed already during the telescope movement.
     61
    5762\subsection{Calibration}
    5863
     
    7782
    7883Even the closest GRB with known redshift ever observed, GRB030329~\cite{GRB030329}, lies at a redshift
    79 of $z=0.1685$. In this case, gamma-rays above 200\,GeV get entirely absorbed.
     84of $z=0.1685$. In this case $\gamma$-rays above 200\,GeV get entirely absorbed.
    8085
    8186\begin{figure}[htp]
    8287\centering
    8388\includegraphics[width=0.85\linewidth]{f4.eps}
    84 \caption{Gamma Ray Horizon, as derived in~\cite{KNEISKE}}
     89\caption{Gamma Ray Horizon as derived in~\cite{KNEISKE}}
    8590\label{fig:grh}
    8691\end{figure}
    8792
    8893\par
    89 We assume now a current energy threshold of 50\,GeV for MAGIC at a zenith angle of $\theta = 0$\footnote{As
    90 this proposal is going to be reviewed in a couple of months, improvements of the energy threshold will be taken
    91 into account, then.}. According
    92 to~\cite{eckart}, the energy threshold of a Cherenkov telescope scales with zenith angle like:
     94
     95We assume now a current energy threshold of 50\,GeV for \ma at a zenith angle of
     96$\theta = 0$\footnote{As this proposal is going to be reviewed in a couple of months, improvements of the energy threshold will be taken into account then.}. According to~\cite{ecl}, the energy threshold of a Cherenkov telescope scales with zenith angle like:
    9397
    9498\begin{equation}
    95 E^{thr}(\theta) = E^{thr}(0) \cdot \cos(\theta)^{-2.7}
     99E_{thr}(\theta) = E_{thr}(0) \cdot \cos(\theta)^{-2.7}
    96100\label{eq:ethrvszenith}
    97101\end{equation}
    98102
    99 Eq.~\ref{eq:ethrvszenith} leads to an energy threshold of about 5.6\,TeV at $\theta = 80^\circ$,
    100 900\,GeV at $\theta = 70^\circ$ and 500\,GeV at $\theta = 65^\circ$.
    101 Inserting these results into the GRH (figure~\ref{fig:grh}), one gets
    102 a maximal observable GRB distance of $z = 0.1$ at $\theta = 70^\circ$ and $z = 0.2$ at $\theta = 65^\circ$.
    103 We think that the probability for
    104 GRBs to occur at these distances is sufficiently small in order to neglect the very difficult observations
    105 beyond these limits.
     103Eq.~\ref{eq:ethrvszenith} leads to an energy threshold of about 5.6\,TeV at $\theta = 80^\circ$,
     104900\,GeV at $\theta = 70^\circ$ and 500\,GeV at $\theta = 65^\circ$.
     105Inserting these results into the GRH (figure~\ref{fig:grh}), one gets a maximal observable GRB distance of $z = 0.1$ at $\theta = 70^\circ$ and $z = 0.2$ at $\theta = 65^\circ$.
     106We think that the probability for GRBs to occur at these distances is sufficiently small in order to neglect the very difficult observations beyond these limits.
    106107
    107108\subsection{In case of follow-up: Next steps}
    108109
    109 We propose to analyse the GRB data at the following day in order to tell whether a follow-up observation during
    110 the next night is useful. We think that a limit of 3\,$\sigma$ significance should be enough to start such a
    111 follow-up observation of the same place. This follow-up observation can then be used in two ways:
     110We propose to analyse the GRB data at the following day in order to tell whether a follow-up observation during the next night is useful. We think that a limit of 3\,$\sigma$ significance should be enough to start such a follow-up observation of the same place. This follow-up observation can then be used in two ways:
    112111
    113112\begin{itemize}
    114113\item In case of a repeated outbursts for a longer time period of direct observation
    115 \item In the other case for having Off-data at exactly the same location.
     114\item In the other case for having Off-data at exactly the same sky location.
    116115\end{itemize}
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