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Instruments used with KANATA telescope |
Currently, three instruments, HOWPol, HONIR and High-speed Camera and Spectrograph, are properly used for observation with KANATA telescope and one instrument.
For convenience of users (especially persons who reduce the raw data), we prepare
an website of engineering schedule concerning the telescope and instruments
[[[ here ]]].
HOWPol (Wide-field One-shot Optical Polarimeter)
HOWPol is an optical imaging polarimeter which provides four linearly polarized images at position angles of 0 deg, 45 degs, 90 degs and 135 degs. Therefore, we can obtain Stokes I, Q, and U parameters simultaneously. The main target of this instrument is prompt emission and afterglow of gamma-ray bursts. HOWPol is operating since 2009. When we receive a discovery report of GRB via GCN, an automatic observation for the GRB with HOWPol is performed immediately at Kanata telescope.
(*6)10-min exposure, delta_R = 0.02 mag, (*7)10-min exposure, delta_P = 0.2%
Basic Specifications Wavelength 0.45 -- 1.1 micron Field of view Imaging: 15' diameter
Impol(wide): 7' x 7'
Impol(narrow): 15' x 1'
Spectroscopy: 2.3" x 15'
Filter B, V, R, I, z', H-alpha Grism Low-res (Grism 420/mm, 620nm blaze, R~400) Wollaston prism (Common) Wedged double Wollaston prism
(Wide) Made of six rutile blocks
(Narrow) Six magnesium fluoride blocks and two fused silica wedgesCCD Two fully depleted 2k-4k CCDs, 200 micron-thick depletion layer Limiting mag Photometry(*6): R = 19.2
Imaging polarimetry(*7): R = 16.0
It enables us to perform simultaneous observation at 1 optical and 1 (or 2 in future) near-infrared wavelength bands. This instrument has observational modes of imaging, spectroscopy, imaging polarimetry, and spectro-polarimetry. HONIR experienced its first light with the Opt/NIR simultaneous imaging mode in 2011 October. In 2014 all observing mode became available.
OPT IR1 IR2 Detector CCD 2kx2k MCT 2k x 2k TBD Field of View 10'x10' 10'x10' 10'x10' Pixel Scale 0.3"/pixel 0.3"/pixel 0.3"/pixel
This CCD camera has been developed by members of Kyoto University and Hamamatsu Photonics K. K, which is attached to the low-resolution spectrograph developed by memvers of Kyoto University and Hiroshima University. The CCD camera has a function of high-speed readout and produces 35.8 FITS images per second at the highest rate. The CCD chip is E2V 512x512 back-illuminated type.
Example of observational error:
Basic Specifications Pixel format 512 x 512 Pixel size 16 micron x 16 micron Focul reducer 1:0.57 (0.26"/pixel) Field of view ~2.3' x 2.3' Cooling 50 deg C below ambient Frame rate Maximum 35.8 frames/sec (no binning) Exposure time Minimum 27.1 msec to maximum 10 sec Spectrograph Grism: 430-690nm, R=150), Prism: 400-800nm, R~20(=9-73)
delta_V = 0.03 mag in maximum frame rate (35.8frame/sec) observation for ~9 mag star