! Swift/XRT detailed lightcurve of trigger: 21816, name: GRB 250309B/IceCube-250309A - source 25
 ! 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 upper limits
70398.784	65620.100	-24339.011	2.1525e-03	0.0000e+00	0.0000e+00	1.7935e-04	7.1683e-06	0.0914