Download - Science with the ASTRI SST Prototype - unipg.itgino.tosti/astrimeeting...S. Vercellone - ASTRI SW Telecon - 2012 May 11! Science with the ASTRI Prototype Science with the ASTRI SST

S. Vercellone - ASTRI SW Telecon - 2012 May 11

!Science with the ASTRI Prototype

Science with the ASTRI SST Prototype

Stefano Vercellone (INAF-IASF Palermo)Contributions by Nicola Sartore (INAF-IASF Milano)

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The ASTRI Prototype

The foreseen ASTRI Prototype performance has been summarized in ASTRI-MC-IFSITO-5000-1 internal document by Vallania & Di Pierro.

Maximum sensitivity : 2 - 5 TeV (1 Crab @ 5 in 7.5h)

In the range 10 - 20 TeV : (1 Crab @ 5 in 20h)

First Crab observations with a Schwarschild-Couder-SiPM Cherenkov telescope.

Possible sources (from Sicily): Crab, MKN 421, MKN 501, ...

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Some preliminary statements

From ASTRI-MC-IFSITO-5000-1 (Vallania & Di Pierro):

• Energy range 0.5 - 10 TeV ➔ analysis of the Hillas parameters and rough estimate of the spectra of a few bright sources.

• Energy range > 10 TeV ➔ detection of the VHE excess from a few bright sources.

⬇Mainly a technological demonstrator... BUT...



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The Crab

Our Rosetta Stone ➡ the Crab



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MKN 501

z = 0.034R.A.: 16h 53m 52.2s

Dec.:+39d 45m 37s

1 Crab [Zanin+2012]

High state [Albert+07]

Low state [Djannati-Atai+99]

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MKN 421

z = 0.031R.A.: 11h 04m 19s Dec.:+38d 11m 41s

1 Crab [Zanin+12]High state [Acciari+11]Low state [Aleksic+12]

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Galactic Sources

MGRO J2019+37 [Abdo+12]

R.A.: 20h 18m 35.0s

Dec.:+36d 50m 00.0s

LSI +61o +303 [Aleksic+11]

R.A.: 02h 40m 34s

Dec.:+61d 15m 25s

HESS J1908+063 [Aharonian+09]

R.A.: 20h 18m 35.0s

Dec.:+36d 50m 00.0s

1 Crab [Zanin+12]

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Some preliminary comments

One of the main question is:

when the prototype will start acquiring astrophysical data ?

The structure (w/o mirrors and camera) should be ready in October 2013

Is it realistic to plan the first-light observation at the end of Spring 2014 ?



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Rough estimate of sources’ visibility

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Some preliminary comments

Applicable to the SST Prototype only.

• Do we need a scheduling of the observations ➔ YES

• Do we need a fast repointing mode for GRBs alert ➔ NO

• Do we need a re-scheduling of the observations (within a few hours) in case of a “flaring Crab” event-like ➔ YES

• Do we need a science simulator for our data ➔ YES



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A preliminary summary

Applicable to the SST Prototype only.

• The number of sources that can be observed and detected by the ASTRI Prototype is extremely limited.

• Most of the time will be spent for calibrations (both HW and SW).

• Expected time-life (before the mini-array advent) about 1.5 yr.

• Science IS feasible, although it’s difficult it will lead to new discoveries.

• Next steps (part I):• investigate the time domain.• investigate synergies with other observatories (cross-calibration with

MAGIC, multi-wavelengths observations, ...).



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A preliminary summary

Next steps (part II):Define I/F between different “items” (SW/SW, HW/HW, HW/SW).Some packages already defined, this could be a good starting point.Some tools already in hands, let’s share them.



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