Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 512, Issue 1, Pages 1391-1399Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac601
Keywords
gamma-ray bursts
Categories
Funding
- Australian Government Research Training Program (RTP) Scholarship
- Australian Research Council Future Fellowship [FT160100112, CE170100004]
- ARC [DP180103155]
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The Zwicky Transient Facility has detected an optical transient AT2020blt at redshift z = 2.9, which is consistent with the afterglow of an on-axis gamma-ray burst. Detailed analysis suggests that AT2020blt is best explained as the afterglow of an on-axis long gamma-ray burst, ruling out other hypotheses. The gamma-ray efficiency of AT2020blt is found to be less than or similar to 0.3-4.5 per cent.
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 less than or similar to 0.3-4.5 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.
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