Table 3
Properties of the GRBs found to have strong spectral deviations in the time-resolved analysis at low energies.
| GRB | Fluencea | Fluence ranka | T90a | Deviationb | Localisationc |
| 10–1000 keV | first 2 years | 50–300 keV | |||
| (erg/cm2) | (s) | ||||
|
|
|||||
| GRB 090323 | 1.2 × 10-4 ± 1.7 × 10-7 | 5 | 135.2 ± 1.5 | +4.9σ (Excess) | Swift XRT1 |
| GRB 090424 | 4.6 × 10-5 ± 3.9 × 10-8 | 19 | 14.1 ± 0.3 | − 6.2σ (Deficit) | Swift XRT2 |
| GRB 090820 | 1.5 × 10-4 ± 1.8 × 10-7 | 3 | 12.4 ± 0.2 | − 5.5σ (Deficit) | GBM3 |
| GRB 090902B | 2.2 × 10-4 ± 3.2 × 10-7 | 2 | 19.3 ± 0.3 | +25.0σ (Excess) | Swift XRT4 |
| GRB 090926A | 1.5 × 10-4 ± 3.4 × 10-7 | 4 | 13.8 ± 0.3 | +6.5σ (Excess) | Swift XRT5 |
Notes.
From Paciesas et al. (2012).
The deviations from the extrapolated fitting method have been normalised by the standard deviation from the simulated distributions for each individual burst section.
The Swift XRT location is sufficiently accurate to model the response of the instrument for spectral analysis, even in cases where a more accurate location is known.
References. (1) Kennea et al. (2009); (2) Cannizzo et al. (2009); (3) Connaughton (2009b); (4) Kennea & Stratta (2009); (5) Vetere et al. (2009).
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