! Swift/XRT hardness ratio of trigger: 1069551, name: GRB 210820A
 ! T0 for this burst is Swift MET=651173908.288, = 2021 Aug 20 at 17:38:00.705 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
READ TERR 1 
READ SERR 2
NO	NO	NO	NO	NO
! PC -- hard data
!Time		Err (pos)	Err(neg)	Rate		Error
548.707	86.574	-76.401	0.423535	0.095397
819.724	349.615	-184.442	0.094861	0.021506
1494.109	367.247	-324.770	0.038474	0.008429
6817.415	821.910	-898.098	0.016732	0.003721
NO	NO	NO	NO	NO
! PC -- soft data
!Time		Err (pos)	Err(neg)	Rate		Error
548.707	86.574	-76.401	1.833742	0.198167
819.724	349.615	-184.442	0.346031	0.044218
1494.109	367.247	-324.770	0.063592	0.010742
6817.415	821.910	-898.098	0.028203	0.004815
NO	NO	NO	NO	NO
! PC -- hardness ratio data
!Time		Err (pos)	Err(neg)	Rate		Error
548.707	86.574	-76.401	0.230968	0.057701
819.724	349.615	-184.442	0.274140	0.071343
1494.109	367.247	-324.770	0.605014	0.167369
6817.415	821.910	-898.098	0.593280	0.166325