! Swift/XRT lightcurve of trigger: 21428, name: GRB 210413B - source 4
 ! T0 for this burst is Swift MET=640050438.9 s, = 2021 Apr 13 at 23:46:52.071 UT
 ! Data covers 0.3-10 keV
 ! The data are in 5 columns:  ! time, time error (+ve), time error (-ve), source count-rate, source error
 ! For a detailed description of light curve production, see Evans et al. 2007 (A&A, 469, 379 )
 ! For a detailed description of the file, see
 ! http://www.swift.ac.uk/xrt_curves/docs.php
 ! This lightcurve was obtained from http://www.swift.ac.uk/xrt_curves/00021428
 ! BINMODE: GRB-like (counts)

READ TERR 1 2
! PC data
!Time    	T_+ve   	T_-ve   	Rate    	Ratepos 	Rateneg
200315.999	6387.141	-11186.916	2.658504e-03	1.203933e-03	-9.330385e-04
3155249.030	40809.808	-40240.340	4.093406e-03	1.979421e-03	-1.502519e-03
NO	NO	NO	NO	NO	NO
! PC Upper limit
2468354.317	23244.865	-23244.865	8.5644e-03	0.0000e+00	0.0000e+00