XRISM XTEND observation 902003010

Title

DDT TOO REQUEST OF MAXI J1543-564

Abstract

MAXI J1543-564 is a transient Galactic black hole X-ray binary (BHXRB) candidate with a single outburst detected in 2011 without any robust constraints on its physical and dynamical parameters. After MAXI spotted this source getting brighter in December 2025, a NuSTAR DDT observation was conducted, suggesting that the source is in an intermediate state with an absorption line at a strange energy of about 6.91 keV. This presents a unique opportunity for XRISM to assess the disc winds in a bright intermediate or soft state, investigate the highly redshifted and highly ionised lines in an XRB and a potentially rare accretion configuration with both disc winds and relativistic reflection, as well as get a high-resolution view of a BH with a very low recurrence rate.

FITS header

TELESCOP= 'XRISM   '           / Mission name
INSTRUME= 'XTEND   '           / Instrument name
OBS_ID  = '902003010'          / Observation identification string
OBJECT  = 'MAXI_J1543-564'     / Object name
OBSERVER= 'XRISM Collaboration' / PI name
OBS_MODE= 'POINTING'           / POINTING or SLEW or ALL
RA_OBJ  =             235.8223 / [deg] Object Right ascension
DEC_OBJ =             -56.4136 / [deg] Object Declination
RA_PNT  =     235.819011612491 / Pointing RA
DEC_PNT =    -56.4151904946139 / Pointing DEC
RA_NOM  =     235.821911529606 / [deg] Nominal aspect point R.A.
DEC_NOM =     -56.413182775641 / [deg] Nominal aspect point Dec.
PA_NOM  =     88.8184947542689 / [deg] Nominal aspect point roll.
TELAPSE =     101958.963135988 / Elapsed time
DATE-OBS= '2026-01-28T22:30:29.036864' / Start date
DATE-END= '2026-01-30T02:49:48' / Stop date
ONTIME  =         42288.022261 / On-source time
EXPOSURE=         42288.022261 / 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    = '2026-02-04T02:07:45' / Date and time this file was created or updated
SIB2_VER= 'V04.00  '           / SIB2 version JAXA

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