! Swift/XRT detailed lightcurve of trigger: 21816, name: GRB 250309B/IceCube-250309A - source 28
 ! T0 for this burst is Swift MET=763198746.212 s, = 2025 Mar 09 at 07:38:31.000 UT

 ! Data covers 0.3-10 keV
 ! For details of light-curve production, see Evans et al. 2007, A&A, 469, 379
 ! BINMODE: GRB-like (counts)
READ TERR 1 2
READ SERR 3
!Time    	T_+ve   	T_-ve   	Rate    	Ratepos 	Rateneg 	BGrate  	BGerr   	FracExp
! PC data
63216.560	72802.324	-17156.784	1.433653e-03	7.104084e-04	-5.599169e-04	1.850749e-04	8.131724e-06	0.091419