Klingler, NJ;
Lien, A;
Oates, SR;
Kennea, JA;
Evans, PA;
Tohuvavohu, A;
Zhang, B;
... Troja, E; + view all
(2021)
Swift Multiwavelength Follow-up of LVC S200224ca and the Implications for Binary Black Hole Mergers.
The Astrophysical Journal
, 907
(2)
, Article 97. 10.3847/1538-4357/abd2c3.
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Abstract
On 2020 February 24, during their third observing run ("O3"), the Laser Interferometer Gravitational-wave Observatory and Virgo Collaboration detected S200224ca: a candidate gravitational wave (GW) event produced by a binary black hole (BBH) merger. This event was one of the best-localized compact binary coalescences detected in O3 (with 50%/90% error regions of 13/72 deg2), and so the Neil Gehrels Swift Observatory performed rapid near-UV/X-ray follow-up observations. Swift-XRT and UVOT covered approximately 79.2% and 62.4% (respectively) of the GW error region, making S200224ca the BBH event most thoroughly followed-up in near-UV (u-band) and X-ray to date. No likely EM counterparts to the GW event were found by the Swift BAT, XRT, or UVOT, nor by other observatories. Here, we report on the results of our searches for an EM counterpart, both in the BAT data near the time of the merger, and in follow-up UVOT/XRT observations. We also discuss the upper limits we can place on EM radiation from S200224ca, as well as the implications these limits have on the physics of BBH mergers. Namely, we place a shallow upper limit on the dimensionless BH charge, $\hat{q}\lt 1.4\times {10}^{-4}$, and an upper limit on the isotropic-equivalent energy of a blast wave E < 4.1 × 1051 erg (assuming typical GRB parameters).
| Type: | Article |
|---|---|
| Title: | Swift Multiwavelength Follow-up of LVC S200224ca and the Implications for Binary Black Hole Mergers |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/1538-4357/abd2c3 |
| Publisher version: | http://doi.org/10.3847/1538-4357/abd2c3 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10118458 |
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