Table 1.
Computed column densities for the SGRBs of the SBAT4 sample.
| GRB | z | T90 | Time-slice (mode) |  |
Γ (Cutoff) | NH(z) | UL value | C-stat |
|---|---|---|---|---|---|---|---|---|
| (s) | (s) | (1020 cm−2) | ( − ) (keV) | (1021 cm−2) | (d.o.f.) | |||
| 051221A | 0.546 | 1.4 | 300 − 1.5 × 105 (PC) | 7.52 | 2.0 ± 0.1 |  |
− | 353.77(357) |
| 060313UL | − | 0.7 | 4100 − 93 × 104 (PC) | 6.17 | 2.0 ± 0.2 |  |
0.7 | 292.56(304) |
| 061201UL | − | 0.8 | 300 − 800 (PC) | 6.57 | 1.6 ± 0.2 |  |
1.3 | 155.78(178) |
| 070714B | 0.923 | 64 | 400 − 1700 (PC) | 9.83 | 1.9 ± 0.1 |  |
− | 225.12(286) |
| 080123UL | 0.495 | 115 | 118 − 163 (WT) | 2.51 | 1.1 ± 0.3 (5.4) |  |
1.4 | 472.92(541) |
| 250 − 2 × 104 (PC) | 2.1 ± 0.3 (−) | |||||||
| 080503UL | − | 170 | 150 − 200 (WT) | 6.98 | 0.7 ± 0.2 (2.9) | 0 | 0.1 | 478.32(591) |
| 280 − 1600 (PC) | 2.4 ± 0.2 (−) | |||||||
| 080905AUL | 0.122 | 0.4 | 400 − 2000 (PC) | 13.4 | 1.6 ± 0.3 |  |
4.0 | 106.82(125) |
| 090510UL | 0.903 | 0.3 | 450 − 2000 (PC) | 1.77 | 1.7 ± 0.1 |  |
1.9 | 350.17(326) |
| 090515UL | − | 0.036 | 70 − 276 (WT) | 2.07 |  (6.4) |
− | 0.2 | 367.26(381) |
| 100117AUL | 0.915 | 0.3 | 105 − 155 (WT) | 2.91 | 0.9 ± 0.6 (4.9) |  |
4.3 | 228.76(331) |
| 300 − 600 (PC) | 2.3 ± 0.3 (−) | |||||||
| 100625AUL | 0.452 | 0.33 | 100 − 708 (PC) | 2.23 | 1.4 ± 0.2 | 0 | 0.7 | 58.56(63) |
| 101219A | 0.718 | 0.6 | 80 − 199 (PC) | 5.79 | 1.4 ± 0.3 |  |
− | 101.98(140) |
| 111117A | 2.221 | 0.47 | 200 − 1300 (PC) | 4.14 | 1.8 ± 0.3 |  |
− | 82.89(111) |
| 130515AUL | − | 0.29 | 80 − 1.8 × 104 (PC) | 7.38 |  |
0 | 1.4 | 32.69(31) |
| 130603B | 0.356 | 0.18 | 5000 − 6500 (PC) | 2.1 | 1.8 ± 0.2 |  |
− | 148.60(206) |
| 140622AUL | − | 0.13 | 100 − 9.2 × 104 (PC) | 5.47 |  |
 |
3.0 | 44.25(44) |
| 140903A | 0.351 | 0.30 | 80 − 1500 (PC) | 3.26 | 1.6 ± 0.1 |  |
− | 444.25(449) |
| 5000 − 1.7 × 105 (PC) | 1.7 ± 0.2 | |||||||
| 140930B | − | 0.84 | 370 − 2000 (PC) | 3.45 | 2.0 ± 0.2 |  |
− | 148.90(197) |
| 141212AUL | − | 0.30 | 72 − 1.9 × 104 (PC) | 10.3 |  |
0 | 1.9 | 25.64(31) |
| 150423AUL | 1.394 | 0.22 | 80 − 1200 (PC) | 1.77 | 1.4 ± 0.2 | 0 | 3.3 | 75.43(128) |
| 150424A | − | 91 | 4200 − 104 (PC) | 6.02 | 2.1 ± 0.3 |  |
− | 157.90(181) |
| 150831AUL | − | 11.5 | 116 − 150 (WT) | 1.14 |  (25.7) |
0 | 0.4 | 218.37(268) |
| 201 − 1300 (PC) | 1.7 ± 0.3 (−) | |||||||
| 151229A | − | 1.78 | 4000 − 4.7 × 104 (PC) | 2.71 | 2.1 ± 0.2 |  |
− | 324.82(383) |
| 160408AUL | − | 0.32 | 100 − 1400 (PC) | 4.18 |  |
 |
1.5 | 101.43(109) |
| 160410AUL | 1.72 | 8.2 | 133 − 179 (WT) | 1.77 |  (28.1) |
0 | 8.8 | 238.51(301) |
| 4200 − 104 (PC) | 1.6 ± 0.3 (−) | |||||||
Notes. Upper limits are marked with an “UL” superscript at the end of the name. Errors and upper limits are given at the 90% confidence level. Listed in this table there are the GRB name, their redshift and the T90 of the prompt emission. The time-slice is the selected interval on which the X-ray spectra were worked out, with the mode noted in brackets. 
is the column density of our Galaxy along the line of sight of the GRB, and its value is from Willingale et al. (2013). Γ is the photon index, with the computed (when needed) cutoff-energy in brackets. NH(z) is the intrinsic column density; here we report also the best fit values of those events that were consistent with 0 within the 90% confidence level (while for some events the fit could not return such a value). All the upper limit values are listed in the relative column, while the last column is the C-stat of the fit, with degrees of freedom in brackets.
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