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Low-efficiency long gamma-ray bursts: a case study with AT2020blt.
- Source :
-
Monthly Notices of the Royal Astronomical Society . May2022, Vol. 512 Issue 1, p1391-1399. 9p. - Publication Year :
- 2022
-
Abstract
- The Zwicky Transient Facility recently announced the detection of an optical transient AT2020blt at redshift z  = 2.9, consistent with the afterglow of an on-axis gamma-ray burst. However, no prompt emission was observed. We analyse AT2020blt with detailed models, showing the data are best explained as the afterglow of an on-axis long gamma-ray burst, ruling out other hypotheses such as a cocoon and a low-Lorentz factor jet. We search Fermi data for prompt emission, setting deeper upper limits on the prompt emission than in the original detection paper. Together with KONUS- Wind observations, we show that the gamma-ray efficiency of AT2020blt is |$\lesssim 0.3\!-\!4.5{{\ \rm per\, cent}}$|. We speculate that AT2020blt and AT2021any belong to the low-efficiency tail of long gamma-ray burst distributions that are beginning to be readily observed due to the capabilities of new observatories like the Zwicky Transient Facility. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GAMMA ray bursts
*REDSHIFT
*COCOONS
*OBSERVATORIES
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 512
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 156217728
- Full Text :
- https://doi.org/10.1093/mnras/stac601