Suzaku Observation : 100021010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '100021010'          / Observation identification string
OBSERVER= 'Suzaku SWG'         / Principal Investigator
OBJECT  = 'A0535+026'          / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =              84.7272 / planned target R.A.(deg)
DEC_OBJ =              26.3158 / planned target DEC.(deg)
RA_NOM  = 8.472430000000000E+01 / Right Ascension of target (deci. deg)
DEC_NOM = 2.631890000000000E+01 / Declination of target (deci. deg)
PA_NOM  =              83.6080 / nominal position angle from north to DETY(deg)
MEAN_EA1=      84.724326454619 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      63.681057371671 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=       6.391956064630 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2005-09-14T13:40:04' / Start date of observations
DATE-END= '2005-09-15T01:00:19' / End date of observations
TSTART  = 1.800223810000000E+08 / time start
TSTOP   = 1.800601380000000E+08 / time stop
TELAPSE = 3.775700000000000E+04 / elapsed time
ONTIME  = 2.176100000000000E+04 / On-source time
EXPOSURE= 2.176100000000000E+04 / Exposure time
MJD-OBS = 5.362759311555555E+04 / MJD of data start time
FILIN001= 'ae100021010xi0_0_2x2n015a_cl.evt.gz' / Input file name
SEQPNUM =                    3 / 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= 'ae100021010xi0_0_3x3n015a_cl.evt.gz' / Input file name
FILIN003= 'ae100021010xi1_0_2x2n016b_cl.evt.gz' / Input file name
FILIN004= 'ae100021010xi1_0_3x3n016b_cl.evt.gz' / Input file name
FILIN005= 'ae100021010xi2_0_2x2n015a_cl.evt.gz' / Input file name
FILIN006= 'ae100021010xi2_0_3x3n015a_cl.evt.gz' / Input file name
FILIN007= 'ae100021010xi3_0_2x2n015a_cl.evt.gz' / Input file name
FILIN008= 'ae100021010xi3_0_3x3n015a_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 to observe the X-ray binary pulsar A0535+26. The main objectives is measuring changes in the cyclotron resonance energy in an outburst decay.It is known from another X-ray pulsar 4U0115+63 that the cyclotron resonance energy increased from 11 keV to 16 keV, as the luminosity decreased across a threshold luminosity of 4x10^37 erg/s. The flare of A0535+26 is a chance to know whether this behavior is the RULE among binary pulsars or an EXCEPTION. A0535+26 is fading down and will reach 30mCrab (5-100keV) on September 17, which is 5x10^36 erg/s. It is better to be observed as soon as possible, before it fades out.