! Swift/XRT hardness ratio of trigger: 773509, name: GRB 170921A ! T0 for this burst is Swift MET=527696948.224 s, = 2017 Sep 21 at 14:28:48.503 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 ! BINMODE: GRB-like (counts) READ TERR 1 READ SERR 2 NO NO NO NO NO ! PC -- hard data !Time Err (pos) Err(neg) Rate Error 118.162 14.162 -13.418 1.918416 0.392815 199.917 178.124 -67.593 0.367029 0.057608 554.381 204.772 -176.340 0.108445 0.021033 1045.415 400.737 -286.262 0.062435 0.010699 5847.683 1334.753 -1077.270 0.010525 0.002466 NO NO NO NO NO ! PC -- soft data !Time Err (pos) Err(neg) Rate Error 118.162 14.162 -13.418 1.610039 0.360016 199.917 178.124 -67.593 0.178680 0.040141 554.381 204.772 -176.340 0.078123 0.017619 1045.415 400.737 -286.262 0.043140 0.008869 5847.683 1334.753 -1077.270 0.011559 0.002594 NO NO NO NO NO ! PC -- hardness ratio data !Time Err (pos) Err(neg) Rate Error 118.162 14.162 -13.418 1.191534 0.361266 199.917 178.124 -67.593 2.054112 0.562936 554.381 204.772 -176.340 1.388128 0.412913 1045.415 400.737 -286.262 1.447273 0.387361 5847.683 1334.753 -1077.270 0.910562 0.295447