XRISM XTEND observation 902002020

Title

DDT TOO REQUEST OF GS1354-64 (2)

Abstract

XRISM observed GS 1354-645 during its outburst. Data from Resolve showed various absorption lines and their temporal fluctuation during the observation. The MAXI light curve and hardness ratio indicate that the outburst is still ongoing, the source is getting brighter in the soft band (2--4 keV), and it has shifted to a softer spectral state. XRISM may acquire GS 1354-645 in a disk-dominated state. Changes in gas ionization, column density, and magnetic field arrangement may augment or make disk winds apparent in spectrally soft states. Distinguishing these possibilities would reveal the physical origin of disk winds in X-ray binaries and the mass outflow budget during an outburst. A further XRISM observation of GS 1354-645 in the soft state is necessary to address this issue.

FITS header

TELESCOP= 'XRISM   '           / Mission name
INSTRUME= 'XTEND   '           / Instrument name
OBS_ID  = '902002020'          / Observation identification string
OBJECT  = 'GS1354-64'          / Object name
OBSERVER= 'XRISM Collaboration' / PI name
OBS_MODE= 'POINTING'           / POINTING or SLEW or ALL
RA_OBJ  =             209.5405 / [deg] Object Right ascension
DEC_OBJ =             -64.7348 / [deg] Object Declination
RA_PNT  =     209.534097375788 / Pointing RA
DEC_PNT =    -64.7364788681366 / Pointing DEC
RA_NOM  =     209.538829591282 / [deg] Nominal aspect point R.A.
DEC_NOM =    -64.7348897676823 / [deg] Nominal aspect point Dec.
PA_NOM  =     101.996398748494 / [deg] Nominal aspect point roll.
TELAPSE =      94243.562052995 / Elapsed time
DATE-OBS= '2026-02-19T18:25:50.398694' / Start date
DATE-END= '2026-02-20T20:36:33.960747' / Stop date
ONTIME  =         5792.3757512 / On-source time
EXPOSURE=         5792.3757512 / Exposure time
PROCVER = '03.03.015.012'      / Processing script version
MKFFF   = 'ISAS/JAXA'          / Origin of First FITS file
ORIGIN  = 'GSFC/NASA'          / Origin of Processed FITS file
SOFTVER = 'Hea_26Sep2025_V6.36_XRISM_12Sep2025_V003' / Version of HEADAS used
CALDBVER= 'gen20241115_xtd20250915_rsl20250915' / Version of CALDB used
DATE    = '2026-02-24T22:53:36' / Date and time this file was created or updated
SIB2_VER= 'V04.00  '           / SIB2 version JAXA

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