! Swift/XRT detailed lightcurve of trigger: 173904, name: GRB 051221B
 ! T0 for this burst is Swift MET=156888200 s, = 2005 Dec 21 at 20:03:20.091 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
309.871	22.599	-20.026	1.800339e+00	4.672934e-01	-4.672934e-01	1.825815e-03	9.129076e-04	0.999994
513.757	5947.526	-181.288	1.038502e-02	2.225342e-03	-2.225342e-03	2.258318e-04	2.036256e-05	0.446329
NO	NO	NO	NO	NO
! PC upper limits
4627671.695	12467.380	-12467.380	3.8642e-03	0.0000e+00	0.0000e+00	4.2648e-05	3.4146e-06	0.1419