Transcript π of the Sky

Wilga 2007
Full π system
and
simulation
Janusz Użycki
Faculty of Physics
Warsaw University of Technology
π of the Sky
Wilga 2007
Plan
Introduction to the „Full Pi system”
Overview of the new system
Mount’s facilities, interfaces of cameras
Simulation: hardware and software
Hierarchy of modules, structures
Results
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Gamma Ray Bursts (GRB)
Discovered in 1967 by spying satellites of USA
Energy: 10 milliards years of the Sun life
Duration: 0.01...100s
Distance: up to 13 milliards light years
Intensity: 2...3 per day (currently observed by satellites)
Origin: outside of the Galaxy
- hipernova – massive star collaps to a black hole?
- merging two neutron stars into a black hole?
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Gamma Ray Bursts (GRB)
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Gamma Ray Bursts (GRB)
Galactic
coordinates
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„Pi of the Sky”
What is it?
The project is being prepared by
Soltan Institute for Nuclear Studies
in collaboration with:
Center of Theoretical Physics,
Polish Academy of Science
Warsaw University
Warsaw University of Technology
other universities and institutes
http://grb.fuw.edu.pl
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The main goals
Research of short timescale (1s...1year)
astrophysical phenomena
Search for extragalactic optical counterparts
of Gamma Ray Bursts (GRB),
determination of limits
Exploration for variable stars (periodic and
aperiodic changes of a star magnitude)
Investigation for new stars
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The main goals
The whole celestial sphere covering
Each “Full Pi” system covers two steradians
(¼ of the Sky → π)
Minimal response time on events like GCN
alerts (GRB Coordinates Network)
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Prototype
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Las Campanas Observatory (LCO)
ASAS experiment dome
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Las Campanas Observatory (LCO)
2 CCD cameras (own developed construction)
The matrix: 2k × 2k pixels
Field of view (FOV): 20º × 20º
Range: 10...11m (1 frame), 12...13m (20 frames)
Parallactic motorized mount (own construction)
Time to target below a minute
3 PC computers
for control and analysis
Ethernet network, UPS, power control,
etc.
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Triggers and alerts - strategy
Scan of the Sky two times per night
Self-trigger – on-line flash recognition
Following SWIFT satellite FOV
Following INTEGRAL satellite FOV
Following up with ASAS 25cm telescope
Reaction to other GCN alerts
Observing some objects from GTN's list
(GTN: Global Telescope Network)
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Modules of Pi software (LCO)
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Full Pi system
The main idea
The Canary Islands
Two sides: parallax
effect usage
~150km apart
~150 km
(eg. La Palma + Tenerife)
1 pixel parallax gives
700 000 km distance
to object
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Full Pi system features
2× 16 CCD cameras
The matrix: 2k × 2k pixels
FOV: 16 × (20º × 20º) ≈ 2 steradians
Canon optics: f = 85mm, f / d = 1.2
Range: 12m (1 frame), 14m (20 frames)
2× 4 parallactic robotic mount
Two modes: side-by-side (WIDE) or common-target (DEEP)
2× 24 PC computers for control and analysis
3000 frames = 25 GB / night / camera
Ethernet networks, power system, etc.
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Ethernet networks diagram
(Full Pi system)
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Ethernet networks diagram
(Full Pi system)
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New parallactic mount
controlled via CAN / Ethernet
DEEP / WIDE
mode
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New CCD camera
USB interface
and Ethernet interface
Power part
Analog part
Digital part
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NUDPSIM
(camera on a mount simulator)
Camera Simulator
LOG: internal + LOG4PI
Configuration file + parameters
Optional FIT file loading
Opened / closed shutter simulation
Optional saving frames as FIT files
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CCD 3D orientation
(mount simulator)
Position:
meridian
equator
γ
W
E
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CCD 3D orientation
(sky simulator)
•RA
•DEC
•φ
φ
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Results
LCO and camera simulator
RA = 2.56417522 hours
DEC = -50.00361 deg
OBJECT S0234-50
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PIXSCALE = 36.08
pixel size: 15mm×15mm
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The nearest future
Cooperation tests of several camera’s and
mount’s simulators with different
combination of computers
and sub-networks structures
Tests the new Pi-software (piman master,
piman, mount and DAQ)
of the system before plug in
the real hardware devices
http://grb.fuw.edu.pl
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