Wilga 2007

π of the Sky

Full π systemand

simulation

Janusz Użycki

Faculty of PhysicsWarsaw University of Technology

Wilga 2007

2π of the Sky

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

Wilga 2007

3π of the Sky

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 yearsIntensity: 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?

Wilga 2007

4π of the Sky

Gamma Ray Bursts (GRB)

Wilga 2007

5π of the Sky

Gamma Ray Bursts (GRB)

Galactic coordinates

Wilga 2007

6π of the Sky

„Pi of the Sky”

What is it?

The project is being prepared bySoltan Institute for Nuclear Studiesin 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

Wilga 2007

7π of the Sky

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 andaperiodic changes of a star

magnitude)

Investigation for new stars

Wilga 2007

8π of the Sky

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)

Wilga 2007

9π of the Sky

Prototype

Wilga 2007

10π of the Sky

Las Campanas Observatory (LCO)ASAS experiment dome

Wilga 2007

11π of the Sky

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 computersfor control and analysis

Ethernet network, UPS, power control,

etc.

Wilga 2007

12π of the Sky

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)

Wilga 2007

13π of the Sky

Modules of Pi software (LCO)

Wilga 2007

14π of the Sky

Full Pi systemThe main idea

The Canary Islands

Two sides: parallax effect usage

~150km apart(eg. La Palma + Tenerife)

1 pixel parallax gives 700 000 km distanceto object

~150 km

Wilga 2007

15π of the Sky

Full Pi system features

2× 16 CCD camerasThe 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 mountTwo 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.

Wilga 2007

16π of the Sky

Ethernet networks diagram(Full Pi system)

Wilga 2007

17π of the Sky

Ethernet networks diagram(Full Pi system)

Wilga 2007

18π of the Sky

Wilga 2007

19π of the Sky

New parallactic mountcontrolled via CAN / Ethernet

DEEP / WIDEmode

Wilga 2007

20π of the Sky

New CCD camera

Digital part

Analog part

Power part

USB interfaceand Ethernet interface

Wilga 2007

21π of the Sky

NUDPSIM(camera on a mount simulator)

Camera SimulatorLOG: internal + LOG4PIConfiguration file + parametersOptional FIT file loadingOpened / closed shutter simulationOptional saving frames as FIT files

Wilga 2007

22π of the Sky

CCD 3D orientation(mount simulator)

W

E

equator

meridian

γ

Position:

Wilga 2007

23π of the Sky

CCD 3D orientation(sky simulator)

•RA•DEC•φ φ

Wilga 2007

24π of the Sky

ResultsLCO and camera simulator

RA = 2.56417522 hoursDEC = -50.00361 degOBJECT S0234-50

PIXSCALE = 36.08pixel size: 15m×15m

Wilga 2007

25π of the Sky

The nearest future

Cooperation tests of several camera’s and mount’s simulators with different combination of computersand sub-networks structures

Tests the new Pi-software (piman master, piman, mount and DAQ)of the system before plug inthe real hardware devices

http://grb.fuw.edu.pl