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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.

(b)

The deviations from the extrapolated fitting method have been normalised by the standard deviation from the simulated distributions for each individual burst section.

(c)

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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