Suzaku Observation : 404007010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '404007010'          / Observation identification string
OBSERVER= 'KAZUTAKA YAMAOKA'   / Principal Investigator
OBJECT  = 'GS 1826-238'        / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             277.3675 / planned target R.A.(deg)
DEC_OBJ =             -23.7969 / planned target DEC.(deg)
RA_NOM  = 2.773735000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = -2.385720000000000E+01 / Declination of target (deci. deg)
PA_NOM  =             267.2862 / nominal position angle from north to DETY(deg)
MEAN_EA1=     277.373499348383 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=     113.857231926824 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     182.713808689397 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2009-10-21T20:22:19' / Start date of observations
DATE-END= '2009-10-23T22:48:24' / End date of observations
TSTART  = 3.094747050000000E+08 / time start
TSTOP   = 3.096532942376150E+08 / time stop
TELAPSE = 1.785892376149893E+05 / elapsed time
ONTIME  = 1.025451320896745E+05 / On-source time
EXPOSURE= 1.025451320896745E+05 / Exposure time
MJD-OBS = 5.512588390259259E+04 / MJD of data start time
FILIN001= 'ae404007010xi0_0_3x3n090l_cl.evt.gz' / Input file name
SEQPNUM =                    2 / Number of times this dataset processed
PROCVER = '3.0.22.43'          / Processing script version
MK1STVER= 'mk1stfits20120530'  / Version of mk1stfits used
SOFTVER = 'Hea_08Feb2016_V6.18_Suzaku_14Nov2013_V22' / Version of HEADAS used
CALDBVER= 'hxd20110913_xis20151005_xrt20110630_xrs20060410' / Version of CALDB u
FILIN002= 'ae404007010xi0_0_5x5n090l_cl.evt.gz' / Input file name
FILIN003= 'ae404007010xi1_0_3x3n101b_cl.evt.gz' / Input file name
FILIN004= 'ae404007010xi1_0_5x5n101b_cl.evt.gz' / Input file name
FILIN005= 'ae404007010xi3_0_3x3n092a_cl.evt.gz' / Input file name
FILIN006= 'ae404007010xi3_0_5x5n092a_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 propose a 100 ksec Suzaku observation of the neutron star (NS) binary GS 1826-238. It is already known that there is a high energy cutoff at around 150 keV in the hard state of black hole candidates (BNCs). Additional non-thermal spectrum above 300 keV has sometimes been verified by gamma-ray observatories. Some NS binaries exhibit a 'hard state' which shows X-ray properties similar to those observed in hard state BHCs. Their cutoff energies (~50 keV) are systematically lower than those of BHCs, but firm detections of non-thermal emissions are not reported so far. This proposal is aimed at the first detection of the non-thermal hard tail from this source in the steady 'hard state', and verification of its possible jet origin via simultaneous radio, near-IR, and optical observations.