! Swift/XRT hardness ratio of trigger: 1344131, name: GRB 250821A
 ! T0 for this burst is Swift MET=777466013.504 s, = 2025 Aug 21 at 10:46:17.308 UT

 ! The hard band is 1.51-10 keV
 ! The soft band is 0.3-1.5 keV
 ! For details of light-curve production, see Evans et al. 2007, A&A, 469, 379
 ! There are 3 datasets: Hard, Soft, and the ratio
 ! Columns are as labelled
 ! BINMODE: 

READ TERR 1
READ SERR 2
NO	NO	NO	NO	NO
! PC -- hard data
!Time		Err (pos)	Err(neg)	Rate		Error
251.180	134.774	-100.914	0.106107	0.023868
487.427	176.839	-101.473	0.066930	0.017436
959.828	4455.201	-295.562	0.019189	0.004532
NO	NO	NO	NO	NO
! PC -- soft data
!Time		Err (pos)	Err(neg)	Rate		Error
251.180	134.774	-100.914	0.121376	0.025489
487.427	176.839	-101.473	0.106223	0.021886
959.828	4455.201	-295.562	0.014584	0.003999
NO	NO	NO	NO	NO
! PC -- hardness ratio data
!Time		Err (pos)	Err(neg)	Rate		Error
251.180	134.774	-100.914	0.874203	0.269022
487.427	176.839	-101.473	0.630091	0.209281
959.828	4455.201	-295.562	1.315830	0.476195