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Prezentacja programu PowerPoint
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