Searching for the Signature of Fast Radio Burst by Swift/XRT X-ray Afterglow Light Curve
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911933536403456 |
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| author | Shen, Hsien-chieh Sakamoto, Takanori Serino, Motoko Sato, Yuri |
| author_facet | Shen, Hsien-chieh Sakamoto, Takanori Serino, Motoko Sato, Yuri |
| contents | A new type of cosmological transient, dubbed fast radio bursts (FRBs), was recently discovered. The source of FRBs is still unknown. One possible scenario of an FRB is the collapse of a spinning supra-massive neutron star. Zhang (2014) suggests that the collapse can happen shortly (hundreds to thousands of seconds) after the birth of supra-massive neutron stars. The signatures can be visible in X-ray afterglows of long and short gamma-ray bursts (GRBs). For instance, a sudden drop (decay index steeper than -3 to -9) from a shallow decay (decay index shallower than -1) in the X-ray afterglow flux can indicate the event. We selected the X-ray afterglow light curves with a steep decay after the shallow decay phase from the Swift/XRT GRB catalog. We analyzed when the decay index changed suddenly by fitting these light curves to double power-law functions and compared it with the onset of FRBs. We found none of our GRB samples match the onset of FRBs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_18104 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Searching for the Signature of Fast Radio Burst by Swift/XRT X-ray Afterglow Light Curve Shen, Hsien-chieh Sakamoto, Takanori Serino, Motoko Sato, Yuri High Energy Astrophysical Phenomena A new type of cosmological transient, dubbed fast radio bursts (FRBs), was recently discovered. The source of FRBs is still unknown. One possible scenario of an FRB is the collapse of a spinning supra-massive neutron star. Zhang (2014) suggests that the collapse can happen shortly (hundreds to thousands of seconds) after the birth of supra-massive neutron stars. The signatures can be visible in X-ray afterglows of long and short gamma-ray bursts (GRBs). For instance, a sudden drop (decay index steeper than -3 to -9) from a shallow decay (decay index shallower than -1) in the X-ray afterglow flux can indicate the event. We selected the X-ray afterglow light curves with a steep decay after the shallow decay phase from the Swift/XRT GRB catalog. We analyzed when the decay index changed suddenly by fitting these light curves to double power-law functions and compared it with the onset of FRBs. We found none of our GRB samples match the onset of FRBs. |
| title | Searching for the Signature of Fast Radio Burst by Swift/XRT X-ray Afterglow Light Curve |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2406.18104 |