Multi-messenger astrophysics

About Multi-messenger astrophysics

Discussions around tools and discoveries in the novel domain of multi-messenger and time domain astrophysics. We'll highlight recent publications, discuss tools to faciliate observations and generally talk about the cool science behind the most violent explosions in the universe.

Publisher

Astro-COLIBRI

Category

science

Language

en

Explicit

No

First episode

6 Oct 2024

Latest episode

16 Oct 2026

Latest episodes

123 episodes in the feed.

1. 

   16 Oct 2026

   Supernovae, TDEs, and Scintillation: How ASKAP and Rubin Are Mapping the Variable Universe

   In this episode, we dive into how astronomers are combining the power of the Australian Square Kilometre Array Pathfinder (ASKAP) and the Vera C. Rubin Observatory to capture the dynamic, ever-changing sky in real time. Historically, optical and gravitational-wave observatories issued rapid alerts, but radio astronomy lacked automated, large-scale, real-time alert infrastructure. Now, a long-term monitoring program (project AS331) targets Rubin’s Deep Drilling Fields (DDFs), taking 3-hour radio snapshots approximately every 10 days to achieve a sensitivity of \\(\sim 60\ \mu\text{Jy}\\). This complementary survey automatically processes and streams radio data to the global astronomical community in near-real-time without human intervention. Episode Highlights & Key Discoveries: Bridging Optical and Radio Astronomy: How contemporaneous, non-coordinated radio surveys solve the bottleneck of follow-up observations for millions of optical alerts. Tidal Disruption Events (TDEs): Updated high-cadence light curves for AT2018hyz, revealing late-time radio flaring and scintillation effects that constrain the outflow size. Supernova Interaction: Modelling circumstellar material interactions around the Type IIb supernova SN2024abfo. New Cosmic Discoveries: The detection of ASKAP J095711.5+051205 (a candidate optical-less TDE in a poststarburst galaxy) and ASKAP J005026.4-422958 (an ongoing Extreme Scattering Event caused by plasma lensing). ### Article Reference Title: ASKAP Monitoring of the Rubin Deep Drilling Fields Authors: Dougal Dobie, James Freeburn, Iris de Ruiter, Katie Auchettl, James Coulson, Brent Miszalski, Anais Möller, and Nikhil Sarin Identifier: arXiv:2610.13011v1 Acknowledements: Podcast prepared with Google/Gemini Notebook. Illustration credits: CSIRO

2. 

   12 Oct 2026

   JWST and MeerKAT Team Up: Uncovering the Most Distant Fast Radio Burst Yet

   Fast Radio Bursts (FRBs) are millisecond-duration radio signals originating from deep space. In this episode, we explore the groundbreaking discovery of FRB 20240304B, detected by the MeerKAT radio telescope in South Africa as part of the MeerTRAP survey. Subsequent near-infrared observations with the James Webb Space Telescope (JWST) pinpointed its host galaxy at an unprecedented spectroscopic redshift of z = 2.148 — tracing the signal back to just 3 billion years after the Big Bang. Key Talking Points Breaking Distance Records: Prior to this discovery, the highest confirmed redshift for an FRB host galaxy was z ~ 1.016. FRB 20240304B more than doubles this distance record, allowing astronomers to probe ionized gas across roughly 80% of cosmic history. The Host Galaxy Profile: Deep imaging and spectroscopy from JWST revealed that the host is a low-mass, actively star-forming, metal-poor dwarf galaxy dominated by a young stellar population. Clues to the FRB Engine: The host's intense star formation and low metallicity support a young magnetar (a highly magnetized neutron star) as the burst progenitor, making long-delay origin models like neutron star mergers far less likely. Intergalactic Obstacles & Hidden Bursts: The signal shows significant pulse scatter broadening and dispersion acquired while passing through foreground plasma (including the Virgo Cluster). This high degree of scattering suggests that many distant FRBs are currently missed by existing radio surveys. ### Article Reference Caleb, M., Nanayakkara, T., Stappers, B. W., Pastor-Marazuela, I., Khrykin, I. S., Glazebrook, K., Tejos, N., Prochaska, J. X., Rajwade, K., Mas-Ribas, L., Driessen, L. N., Fong, W., Gordon, A. C., Hoffmann, J. L., James, C. W., Jankowski, F., Kahinga, L., Kramer, M., Simha, S., Barr, E. D., Bezuidenhout, M. C., Deng, X., Lin, Z., Marnoch, L., Martin, C. D., Nugent, A., Shaji, K., & Tian, J. (2026). A fast radio burst at redshift 2, three billion years after the Big Bang. Science, DOI: [10.1126/science.adz2675](https://doi.org/10.1126/science.adz2675). Acknowledements: Podcast prepared with Google/Gemini Notebook. Illustration credits: NASA, ESA, CSA, STScI, Themiya Nanayakkara (USYD); Image Processing: Joseph DePasquale (STScI)

3. 

   8 Oct 2026

   GRB 221009A: Measuring Relativistic Jets using Radio Interferometry

   In this episode, we explore high-precision Very Long Baseline Interferometry (VLBI) radio observations of GRB 221009A, the brightest gamma-ray burst ever detected. Using the Global-VLBI network at 5 GHz between 231 and 750 days post-burst, an international team of astronomers directly measured the expanding projected image size and relativistic velocity of the blast wave. Their direct size measurements provide a powerful test of theoretical afterglow physics, revealing that existing multi-wavelength models struggle to reproduce the physical size evolution of the burst. Key Takeaways & Discussion Points: Direct Size & Expansion Measurements: Global-VLBI observations achieved sub-milliarcsecond resolution, resolving the source size with relative uncertainties of 13% and 30% at 231 and 391 days post-burst. Challenging Current Theories: None of the published multi-wavelength afterglow models in the literature have best-fitting parameters that match the observed 5 GHz size evolution within \\(2\sigma\\), demonstrating that direct VLBI imaging is essential to break parameter degeneracies in gamma-ray burst physics. ### Article Reference Title: Comparing the size evolution of GRB 221009A with afterglow models Authors: S. Giarratana, O. S. Salafia, B. Marcote, Z. Paragi, M. Giroletti, G. Ghirlanda, L. Nava, A. van der Horst, J. K. Leung, L. Rhodes, P. G. Edwards, M. Pérez-Torres, and J. Yang Publication Context: Astronomy & Astrophysics manuscript Acknowledements: Podcast prepared with Google/Gemini Notebook. Illustration credits: NASA/JPL

Reach and audience

Public platform figures. Ratings count people who left a rating, not total listeners.

YouTube views

5,078

Score snapshot 15 Sept 2025

Apple Podcasts (US)

5.0 / 5

1 ratings

Spotify

5.0 / 5

2 ratings

Podcast Authority Score: 49 / 100

A composite of feed quality, social presence, YouTube performance and engagement. Read the methodology.

Quality

55

Social presence

0

YouTube

74

Engagement

32

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