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Title: | The nature of optical afterglows without Gamma-ray bursts: Identification of AT2023lcr and multiwavelength modeling |
Authors: | Li, Maggie L Ho, Anna Y. Q Ryan, Geoffrey Perley, Daniel A Lamb, Gavin P Nayana, A. J Andreoni, Igor Anupama, G. C Bellm, Eric C Berger, E Bloom, Joshua S Burns, Eric Caiazzo, Ilaria Chandra, P Coughlin, Michael W El-Badry, Kareem Graham, Matthew J Kasliwal, Mansi M Keating, Garrett K Kulkarni, S. R Kumar, Harsh Masci, Frank J Perley, Richard A Ramprasad Rao Rodriguez, Antonio C Rusholme, Ben Sarin, Nikhil Sollerman, Jesper Srinivasaragavan, Gokul P Swain, Vishwajeet Vanderbosch, Zachary |
Keywords: | Gamma-ray bursts Transient sources Surveys Sky surveys Radio transient sources X-ray transient sources |
Issue Date: | 20-May-2025 |
Publisher: | American Astronomical Society |
Citation: | The Astrophysical Journal, Vol. 985, No. 1, 124 |
Abstract: | In the past few years, the improved sensitivity and cadence of wide-field optical surveys have enabled the discovery of several afterglows without associated detected gamma-ray bursts (GRBs). We present the identification, observations, and multiwavelength modeling of a recent such afterglow (AT2023lcr), and model three literature events (AT2020blt, AT2021any, and AT2021lfa) in a consistent fashion. For each event, we consider the following possibilities as to why a GRBwas not observed: (1) the jet was off-axis; (2) the jet had a low initial Lorentz factor; and (3) the afterglow was the result of an on-axis classical GRB (on-axis jet with physical parameters typical of the GRB population), but the emission was undetected by gamma-ray satellites. We estimate all physical parameters using afterglowpy and Markov Chain Monte Carlo methods from emcee. We find that AT2023lcr, AT2020blt, and AT2021any are consistent with on-axis classical GRBs, and AT2021lfa is consistent with both on-axis low Lorentz factor (Γ0 ≈ 5–13) and off-axis (θobs = 2θjet) high Lorentz factor (Γ0 ≈ 100) jets. |
Description: | Open Access Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI |
URI: | http://hdl.handle.net/2248/8774 |
ISSN: | 1538-4357 |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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The Nature of Optical Afterglows without Gamma-Ray Bursts_Identification of AT2023lcr and Multiwavelength Modeling.pdf | 173.34 MB | Adobe PDF | View/Open |
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