Journal
ASTROPHYSICAL JOURNAL
Volume 730, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0004-637X/730/2/135
Keywords
gamma-ray burst: general; radiation mechanisms: non-thermal
Categories
Funding
- Polish MNiSW [N N203 380336]
- Angelo Della Riccia Foundation
- Science and Technology Facilities Council [ST/H001972/1] Funding Source: researchfish
- STFC [ST/H001972/1] Funding Source: UKRI
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Gamma-ray bursts (GRBs) are the most energetic sources in the universe and among the farthest known astrophysical sources. These features make them appealing candidates as standard candles for cosmological applications such that studying the physical mechanisms for the origin of the emission and correlations among their observable properties is an interesting task. We consider here the luminosity L*(X) and break time T*(a) (hereafter LT) correlation and investigate whether there are systematics induced by selection effects or redshift-dependent calibration. We perform this analysis both for the full sample of 77 Swift GRBs with known redshift and for the subsample of GRBs having canonical X-ray light curves, hereafter called the U0095 sample. We do not find any systematic bias, thus confirming the existence of physical GRB subclasses revealed by tight correlations of their afterglow properties. Furthermore, we study the possibility of applying the LT correlation as a redshift estimator both for the full distribution and for the canonical light curves. The large uncertainties and the non-negligible intrinsic scatter make the results not so encouraging, but there are nevertheless some hints motivating a further analysis with an increased U0095 sample.
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