Suzaku Observation : 406013010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '406013010'          / Observation identification string
OBSERVER= '        '           / Principal Investigator
OBJECT  = 'CYG X-1 '           / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             299.5907 / planned target R.A.(deg)
DEC_OBJ =              35.1892 / planned target DEC.(deg)
RA_NOM  = 2.995916000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = 3.517450000000000E+01 / Declination of target (deci. deg)
PA_NOM  =             279.5001 / nominal position angle from north to DETY(deg)
MEAN_EA1=     299.591553035700 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      54.825466747389 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     170.499884025515 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2011-10-05T22:11:17' / Start date of observations
DATE-END= '2011-10-06T22:00:23' / End date of observations
TSTART  = 3.711703294975038E+08 / time start
TSTOP   = 3.712520897838906E+08 / time stop
TELAPSE = 8.176028638684750E+04 / elapsed time
ONTIME  = 4.632693693518639E+03 / On-source time
EXPOSURE= 4.632693693518639E+03 / Exposure time
MJD-OBS = 5.583995363057296E+04 / MJD of data start time
FILIN001= 'ae406013010xi0_0_2x2b122l_cl.evt.gz' / Input file name
SEQPNUM =                    4 / Number of times this dataset processed
PROCVER = '3.0.22.44'          / Processing script version
MK1STVER= 'mk1stfits20120530'  / Version of mk1stfits used
SOFTVER = 'Hea_08Feb2016_V6.18_Suzaku_14Nov2013_V22' / Version of HEADAS used
CALDBVER= 'hxd20110913_xis20160607_xrt20110630_xrs20060410' / Version of CALDB u
FILIN002= 'ae406013010xi1_0_3x3b124b_cl.evt.gz' / Input file name
COMMENT -------------------------
COMMENT BITPIX compressed from 32 to 8.
COMMENT Pixel values greater than 255 was set to 255.
COMMENT This file was made for JUDO-Suzaku.
COMMENT -------------------------
COMMENT   FITS (Flexible Image Transport System) format is defined in 'Astronomy

Abstract:

We achieved 0.1 s time resolution with enough statistics on accumulating profiles of source brightening and made clear that electron temperature decreases and optical depth increases at the peak of brightness by using the XIS data of Psum mode. Progress to understanding the nature of fast time variability, which has been a mystery for 40 years since its discovery, connected with spectral properties is being made now. However, this property is not confirmed yet in other observations having different time scales of variability and spectral shapes, lacking the XIS data in Psum mode. We propose here another observation of Cyg X-1 with XIS0 1/8 window no burst, XIS1 1/4 window 0.5 s burst,and XIS3 Psum mode for a exposure of 40 ks.