! Swift/XRT hardness ratio of trigger: 21462, name: GRB 210901B - source 5
 ! T0 for this burst is Swift MET=652147287.808, = 2021 Sep 01 at 00:01:00.000 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