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PODCAST

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.

science astronomy

All Episodes

00:14:06

V1723 Sco and V6598 Sgr: Decoding the Fastest and...

Multi-messenger astrophysics ·

2025/12/18

Classical novae, thermonuclear eruptions on the surface of a white dwarf in a binary system, are known sources of high-energy gamma-rays detected by the Fermi-LAT. This episode explores a multi-wavelength analysis of two recent novae, **V1723 Sco 2024** and **V6598 Sgr 2023**, aiming to constrain the mechanism behind this intense gamma-ray emission.**V1723 Sco** proved to be a very bright gamma-ray source, with emission lasting 15 days, allowing scientists to constrain the total energy and spectral

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00:17:15

Exploding Star in the Early Universe: The SVOM...

Multi-messenger astrophysics ·

2025/12/10

Join us as we explore the remarkable cosmic event, **GRB 250314A**, an exploding star detected deep within the early Universe. This long gamma-ray burst (LGRB), observed by the SVOM satellite, was spectroscopically measured at a redshift of approximately **$z \approx 7.3$**, meaning it occurred when the Universe was only about 5% of its current age, placing it firmly in the era of reionization.The observation campaign was critical, identifying the GRB as a classical long (Type II) event, consistent

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00:14:07

Satellite megaconstellations will threaten...

Multi-messenger astrophysics ·

2025/12/08

The rapid expansion of Low Earth Orbit (LEO) satellite megaconstellations is creating a growing threat to space-based astronomy, challenging the long-held perception that space telescopes are immune to light contamination.If all proposals for new telecommunication satellite launches are fulfilled, projections indicate that Earth could be orbited by **half a million artificial satellites by the end of the 2030s**. Currently, the total number of satellites is only a small fraction (less than 3%) of

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00:13:55

AT2022zod: An Unusual Tidal Disruption Event

Multi-messenger astrophysics ·

2025/12/05

**Topic:** Tidal Disruption Events (TDEs) are short-lived optical flares that occur when a black hole shreds a star, offering valuable insight into black hole demographics. This episode dives into the unusual characteristics and implications of the event AT2022zod.**The Event:*** AT2022zod was identified as an extreme, short-lived optical flare in an elliptical galaxy at a redshift of 0.11.* The event lasted roughly 30 days, with a rapid rise time of approximately 13 days.* It reached a high

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00:14:35

The Next Frontier in Astronomical Text Mining:...

Multi-messenger astrophysics ·

2025/12/01

This episode dives into how astronomers are leveraging cutting-edge AI to make sense of decades of critical astronomical observations, focusing on the General Coordinates Network (GCN).The GCN, NASA’s time-domain and multi-messenger alert system, distributes over 40,500 human-generated "Circulars" which report high-energy and multi-messenger astronomical transients. Because these Circulars are flexible and unstructured, extracting key observational information, such as **redshift** or

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00:15:32

CHIME’s Cosmic Echo: The First Detection of the 21 cm...

Multi-messenger astrophysics ·

2025/11/27

Reference Article: Detection of the Cosmological 21 cm Signal in Auto-correlation at z ∼ 1 with the Canadian Hydrogen Intensity Mapping Experiment, by The CHIME Collaboration.Summary:We delve into a groundbreaking astronomical achievement: the **first detection of the cosmological 21 cm intensity mapping signal in auto-correlation at $z \sim 1$** using the Canadian Hydrogen Intensity Mapping Experiment (CHIME). This discovery utilizes 94 nights of observation data, covering a frequency range from

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00:14:48

Red supergiant forensics: LST-1's Search for...

Multi-messenger astrophysics ·

2025/11/24

In this episode, we dive into the latest findings on **Supernova (SN) 2024bch**, a spectacular stellar death event observed in the nearby galaxy NGC 3206 ($\sim 20$ Mpc). Scientists conducted a multiwavelength analysis, combining **Very High-Energy (VHE) gamma-ray observations** with optical photometry and spectroscopy.**Key Findings:*** **Classification:** SN 2024bch is classified as a potential **Type IIn-L supernova**. This type of core-collapse supernova (CCSNe) exhibits a fast linear decay in

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00:11:03

The PanRadio Collaboration’s First Results – The...

Multi-messenger astrophysics ·

2025/11/17

This episode dives into the extraordinary 400-day observing campaign of Gamma-ray Burst (GRB) 230815A, the first major result from the Panoptic Radio View of Gamma-ray Bursts (“PanRadio GRB”) program.**The PanRadio Program**The PanRadio GRB program is a systematic, multi-year radio survey carried out on the Australia Telescope Compact Array (ATCA). Its goal is to provide comprehensive, multi-frequency (1–50 GHz), and high-cadence radio monitoring of all southern *Swift* GRB events, following their

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00:15:37

15 Years Under the Sea: ANTARES’ Final Search for...

Multi-messenger astrophysics ·

2025/11/10

The Search for Galactic NeutrinosThis episode explores the final results from the ANTARES neutrino telescope, which operated in the Mediterranean Sea off the coast of Toulon, France. Researchers analyzed the full, 15-year dataset (2007–2022) to search for diffuse Galactic neutrinos. These neutrinos are produced when cosmic rays (CRs) interact with interstellar matter (gas and radiation fields) in the Milky Way. Understanding this diffuse flux is key to deciphering cosmic ray transport

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00:13:19

A Star’s Death by a Thousand Cuts: The Runaway...

Multi-messenger astrophysics ·

2025/11/03

In this episode, we dive into the fascinating and violent world of galactic centers with the discovery of **AT2023uqm**, a new nuclear transient offering unprecedented insights into stellar consumption by supermassive black holes (SMBHs).AT2023uqm is only the second confirmed case of a star undergoing **repeated partial tidal disruption events (rpTDEs)**, where a star on a bound, eccentric orbit repeatedly loses its outer layers as it approaches the SMBH.**What makes AT2023uqm unique?**Unlike its

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00:12:33

NGC1068 and Its Kin: New Evidence for Neutrino...

Multi-messenger astrophysics ·

2025/10/20

Join us as we discuss the latest results from the IceCube Neutrino Observatory, utilizing 13.1 years of data, that further link high-energy neutrinos to powerful cosmic sources.### Episode Highlights* **The Extragalactic Neutrino Puzzle:** The IceCube Neutrino Observatory consistently detects a diffuse flux of high-energy cosmic neutrinos, the majority of which are extragalactic in origin. These neutrinos are expected to be produced in hadronic interactions, which also generate gamma rays.*

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00:18:50

LHAASO’s Giant Peanut: A Challenge to Extreme...

Multi-messenger astrophysics ·

2025/10/13

Join us as we discuss the groundbreaking discovery by the LHAASO Collaboration of a vast and unique ultra-high-energy (UHE) $\gamma$-ray source. This mysterious object, nicknamed the **"Peanut"** for its distinctive asymmetric shape, spans approximately $0.45^\circ \times 4.6^\circ$ and is located far off the Galactic plane, at a high Galactic latitude ($b \approx -17.5^\circ$), a region where UHE $\gamma$-ray sources are typically sparse.**Key Takeaways:*** **Extreme Energies Detected:**

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00:19:37

Cosmic Ray Neighbors: How Nearby Transients Solve the...

Multi-messenger astrophysics ·

2025/10/09

The origin of ultra-high-energy cosmic rays (UHECRs) has long been one of the central open questions in astroparticle physics. We dive into fascinating new research suggesting that the answer lies not in distant, powerful sources, but in **rare, stellar transients (like neutron star mergers) occurring right here in our neighboring galaxies**.**Key Takeaways:*** **Nearby Dominance:** The UHECR flux above 25 EeV is shown to be largely **dominated by just ten nearby galaxies located within 8 Mpc** of

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00:17:32

Cosmic Outlier: X-ray Clues to the Mystery of GRB...

Multi-messenger astrophysics ·

2025/10/01

**GRB 250702B** is an **exceptional transient** that has puzzled astronomers, as it does not neatly fit into the expected populations of **ultra-long Gamma-Ray Bursts (GRBs)** or **relativistic Tidal Disruption Events (TDEs)**.The event produced luminous gamma-ray radiation lasting **over 25 ks** (thousands of seconds), classifying it as an ultra-long GRB. However, unlike any previously known GRB, the Einstein Probe discovered a soft X-ray "precursor" activity up to **24 hours before the

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00:15:35

Constraining Gamma-Ray Burst Parameters with the...

Multi-messenger astrophysics ·

2025/09/22

This week, we dive into the cosmic puzzle posed by ultra-high-energy (UHE) neutrinos. The conversation centers on the **KM3-230213A event**, detected by the KM3NeT/ARCA detector, which is the **highest-energy neutrino observed to date**, estimated at $220^{+570}_{-110}$ PeV. This detection marks the first observation of a presumed astrophysical neutrino in the UHE regime.We explore the longstanding candidates for these UHE neutrinos: **Gamma-Ray Bursts (GRBs)**. GRBs are the most energetic transient

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00:14:19

Unmasking Cosmic Explosions with the Einstein Probe

Multi-messenger astrophysics ·

2025/09/15

his episode dives into the groundbreaking discoveries of the Einstein Probe, a new soft X-ray mission revolutionizing our understanding of high-energy transients in the universe.The Einstein Probe (EP), launched on January 9, 2024, has opened a new era of transient discovery in the previously largely unexplored soft X-ray band. It detects numerous fast X-ray transients, many of which surprisingly show no gamma-ray emission, making their connection to more common gamma-ray bursts (GRBs) a key

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00:16:56

Unprecedented Radio Views: Decoding GRB 231117A's...

Multi-messenger astrophysics ·

2025/08/27

Join us as we explore the groundbreaking observations of **GRB231117A**, a short gamma-ray burst (SGRB) located at a redshift of z = 0.257. This event, detected by the Neil Gehrels Swift Observatory, was quickly followed up by the Australia Telescope Compact Array (ATCA) just 1.3 hours post-burst, providing **unprecedented early radio detection**.**In this episode, we discuss:*** **Early Radio Afterglow:** How ATCA's rapid response revealed a dynamic early radio afterglow with **flaring,

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00:16:57

Beyond the Burst: How Host Galaxies Shape Fast Radio...

Multi-messenger astrophysics ·

2025/08/13

Join us as we explore the latest research into Fast Radio Bursts (FRBs), mysterious, intense pulses of radio emission lasting only milliseconds. These cosmic phenomena are not just fleeting signals; they are powerful probes of the ionized gas across the universe and valuable tools for cosmological studies. In this episode, we delve into an investigation of FRB properties and their host galaxies, aiming to understand how the environment surrounding an FRB influences its observed characteristics.What

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00:21:49

A Glimpse into the Early Universe with FRB 20240304B

Multi-messenger astrophysics ·

2025/08/07

Join us as we explore the groundbreaking discovery of FRB 20240304B, the most distant Fast Radio Burst (FRB) ever detected, offering unprecedented insights into the early universe.In this episode, we discuss:• What are Fast Radio Bursts (FRBs)? These enigmatic, millisecond-duration radio signals provide unique information about the plasma permeating our universe, revealing details about magnetic fields and gas distributions.• The Record-Breaking Discovery: FRB 20240304B was detected by the MeerKAT

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00:16:38

Einstein Telescope + WST: Spectroscopy's Role in the...

Multi-messenger astrophysics ·

2025/07/10

In this episode, we dive into the exciting future of **multi-messenger astronomy**, specifically focusing on the detection and characterization of binary neutron star (BNS) mergers.* **The Dawn of Multi-Messenger Astrophysics:** Our understanding of cosmic events was revolutionized by the extraordinary joint detection of gravitational waves (GWs) and light from a BNS merger on August 17, 2017 (GW170817). This single event confirmed theoretical hypotheses about short gamma-ray bursts (SGRBs)

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