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1. Late-time Radio and Millimeter Observations of Superluminous Supernovae and Long Gamma-Ray Bursts: Implications for Central Engines, Fast Radio Bursts, and Obscured Star Formation

   https://doi.org/10.3847/1538-4357/abe9b8  

   Eftekhari, T. ; Margalit, B. ; Omand, C. M. ; Berger, E. ; Blanchard, P. K. ; Demorest, P. ; Metzger, B. D. ; Murase, K. ; Nicholl, M. ; Villar, V. A. ; et al ( April 2021 , The Astrophysical Journal)
2. A targeted search for repeating fast radio bursts associated with gamma-ray bursts

   https://doi.org/10.1093/mnras/staa3352  

   Palliyaguru, Nipuni T ; Agarwal, Devansh ; Golpayegani, Golnoosh ; Lynch, Ryan ; Lorimer, Duncan R ; Nguyen, Benjamin ; Corsi, Alessandra ; Burke-Spolaor, Sarah ( December 2020 , Monthly Notices of the Royal Astronomical Society)

   ABSTRACT The origin of fast radio bursts (FRBs) still remains a mystery, even with the increased number of discoveries in the last 3 yr. Growing evidence suggests that some FRBs may originate from magnetars. Large, single-dish telescopes such as Arecibo Observatory (AO) and Green Bank Telescope (GBT) have the sensitivity to detect FRB 121102-like bursts at gigaparsec distances. Here, we present searches using AO and GBT that aimed to find potential radio bursts at 11 sites of past gamma-ray bursts that show evidence for the birth of a magnetar. We also performed a search towards GW170817, which has a merger remnantmore »whose nature remains uncertain. We place $10\sigma$ fluence upper limits of ≈0.036 Jy ms at 1.4 GHz and ≈0.063 Jy ms at 4.5 GHz for the AO data and fluence upper limits of ≈0.085 Jy ms at 1.4 GHz and ≈0.098 Jy ms at 1.9 GHz for the GBT data, for a maximum pulse width of ≈42 ms. The AO observations had sufficient sensitivity to detect any FRB of similar luminosity to the one recently detected from the Galactic magnetar SGR 1935+2154. Assuming a Schechter function for the luminosity function of FRBs, we find that our non-detections favour a steep power-law index (α ≲ −1.1) and a large cut-off luminosity (L0 ≳ 1041 erg s−1).« less
3. The capability of the Australian Square Kilometre Array Pathfinder to detect prompt radio bursts from neutron star mergers

   https://doi.org/10.1017/pasa.2020.42  

   Wang, Ziteng ; Murphy, Tara ; Kaplan, David L. ; Bannister, Keith W. ; Dobie, Dougal ( January 2020 , Publications of the Astronomical Society of Australia)

   Abstract We discuss observational strategies to detect prompt bursts associated with gravitational wave (GW) events using the Australian Square Kilometre Array Pathfinder (ASKAP). Many theoretical models of binary neutron stars mergers predict that bright, prompt radio emission would accompany the merger. The detection of such prompt emission would greatly improve our knowledge of the physical conditions, environment, and location of the merger. However, searches for prompt emission are complicated by the relatively poor localisation for GW events, with the 90% credible region reaching hundreds or even thousands of square degrees. Operating in fly’s eye mode, the ASKAP field of viewmore »can reach $\sim1\,000$ deg $^2$ at $\sim$ $888\,{\rm MHz}$ . This potentially allows observers to cover most of the 90% credible region quickly enough to detect prompt emission. We use skymaps for GW170817 and GW190814 from LIGO/Virgo’s third observing run to simulate the probability of detecting prompt emission for GW events in the upcoming fourth observing run. With only alerts released after merger, we find it difficult to slew the telescope sufficiently quickly as to capture any prompt emission. However, with the addition of alerts released before merger by negative-latency pipelines, we find that it should be possible to search for nearby, bright prompt fast radio burst-like emission from GW events. Nonetheless, the rates are low: we would expect to observe $\sim$ 0.012 events during the fourth observing run, assuming that the prompt emission is emitted microseconds around the merger.« less
4. Magnetic Reconnection during the Post-impulsive Phase of a Long-duration Solar Flare: Bidirectional Outflows as a Cause of Microwave and X-Ray Bursts

   https://doi.org/10.3847/1538-4357/aba8a6  

   Yu, Sijie ; Chen, Bin ; Reeves, Katharine K. ; Gary, Dale E. ; Musset, Sophie ; Fleishman, Gregory D. ; Nita, Gelu M. ; Glesener, Lindsay ( September 2020 , The Astrophysical Journal)
5. Time-spatial correspondence between Pi2 wave power and ultra-violet aurora bursts

   https://doi.org/10.2205/2017ES000606  

   Martines-Bedenko, V. A. ; Pilipenko, V. A. ; Engebretson, M. J. ; Moldwin, M. B. ( January 2017 , Russian Journal of Earth Sciences)