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3rd Potsdam Thinkshop Robotic Astronomy, July 12-15 2004
π of the Sky
Automated search for fast optical transients
over the whole sky
http://grb.fuw.edu.pl
Mankiewicza.,
Burdb,
Cwiokc,
L.
A.
M.
H. Czyrkowskic, R. Dabrowskic, W. Dominikc, M. Grajdab, G.Kasprowiczb, M. Jegierb,
d
c
c
K. Nawrocki , B. Pilecki , L.W. Piotrowski , K. Pozniakb, R. Romaniukb, R. Salanskib, M. Sokolowskid, S. Stankiewiczb, D. Szczygielc,
G. Wrochnad
aCenter for Theoretical Physics PAN, Warsaw; bInstitute of Electronic Systems, Warsaw University of Technology;
cInstitute of Experimental Physics, Warsaw University; dSoltan Institute for Nuclear Studies, Warsaw, Poland
In collaboration with ASAS project by G.Pojmanski
Design:
Working prototype:
• 2 x 16 CCD cameras, 2000x2000 pixels, 5-10s exposures
• optics: f=50mm, f/d=1.4 lenses, FOV ~ 35ox35o
• covers ~ π sr of the sky (whole sky h>20o)
• fixed mount (no need to move)
• data stream ~128 MB/s i.e. ~5 TB/night (USB 2.0 interface)
• the whole night sky stored for ~12 hours
• on-line analysis: automatic flash recognition in real time
by a multilevel trigger system
• fast reaction to GCN triggers
• off–line analysis (next day): standard photometry
and astrometry up to 12m (variables, asteroids)
• 2 CCD cameras, 2000x2000 pixels, custom design
• fast, programmable electronics (FPGA, µP, RAM)
• RN ~16e- @ 2 Mpixels/s, 12e- @ 1 Mpixel/s
• custom shutter design ~107 cycles
• motorized mount, goes to any point in < 1 min
• localization: ASAS site, Las Campanas
Modes of Operation:
• self-trigger – flash recognition in real time
• following HETE FOV
• reaction to other GCN alerts
• triggers for ASAS 25cm telescope
Optimized for GRB related OT - no delay w.r.t. satellite triggers, data prior to GRB
FIRST RESULTS – examples of short optical transients
~9m
Optical flash
detected at 2004.07.04 4:01:19 UT
RA 17h 40m 39s, Dec -11o 13' (J2000) ± 2 arcmin
Origin of the flash has not been verified. The flash
was in HETE FOV, but no HETE alert was issued.
No satellite from a data base (containing 8000
satellites) could be responsible for the flash.
-7s
t0
no filter
IR-cut
Autors are grateful to B.Paczynski for support and encouragement
+7s
Optical flash detected at 2004.02.21 0:27 UT
RA 11h 18m 44s, Dec -6o 6.5' (J2000.0) ± 2 arcmin.
An object of 9.0m and 9.7m seen on two consecutive
frames taken with fixed mount camera. The object
coincides within 1 arcmin with LEDA 114805
galaxy. It was outside HETE FOV.
-70s (6 frames)
t0
+10s