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Mansi M. Kasliwal discusses the Global Relay of Observatories Watching Transients Happen (GROWTH) collaboration and shares her enthusiasm about the future of multi-messenger astrophysics.

Palomar Gattini-IR is the first of a number of infrared transient surveyors that will search the skies nightly, looking for ephemeral phenomena such as novae, supernovae and neutron star merger events, explain Co-lead Researchers Anna Moore and Mansi Kasliwal.

Observations of optical flares from AT2022tsd (the ‘Tasmanian Devil’) show that they have durations on the timescale of minutes, occur over a period of months, are highly energetic, are probably nonthermal and have supernova luminosities.

Superluminous supernova SN 2017egm has a complex light curve that is well modelled by successive collisions of a shockwave with dense circumstellar shells ejected by its massive progenitor star during the pair-instability pulsation stage. Such a scenario might be responsible for providing a power source for superluminous supernovae in general.

An extreme flare has been seen from a supermassive black hole at redshift z = 2.6. First detected in 2018, it is 30 times brighter than similar events. The most likely cause is the shredding of a star of 30 solar masses or more.

Archival images of the progenitor system of supernova SN 2011fe are so sensitive that the presence of luminous red giants or most helium stars is directly ruled out.

Multi-instrument detection of a nearby type 1a supernova shows that the exploding star was probably a carbon–oxygen white dwarf star in a binary system with a main-sequence companion.

A long-period radio transient with coincident radio and X-ray emission and observational properties unlike any known Galactic object has been observed by the Australian Square Kilometre Array Pathfinder.

A type Ia supernova shows the presence of helium-rich circumstellar material, as demonstrated by its spectral features, infrared emission and a radio counterpart, that probably originates from a single-degenerate system in which a white dwarf accretes material from a helium donor star.

SN 2022qmx, dubbed SN Zwicky, is a rare, gravitationally lensed type Ia supernova, magnified by a factor of 25, discovered by the Zwicky Transient Facility. Follow-up Keck observations reveal four multiple images with unusually small separation.

Observations of ZTF SLRN-2020, a short-lived optical outburst in the Galactic disk accompanied by bright, long-lived infrared emission, show that the resulting light curve and spectra are consistent with the signatures of a planet being engulfed by its host star.

A series of early-time, multiwavelength observations of an optical transient, AT2022cmc, indicate that it is a relativistic jet from a tidal disruption event originating from a supermassive black hole.

A stripped-envelope supernova, SN 2022jli, shows 12.4-day periodic undulations during the declining light curve, and narrow Hα emission is detected in late-time spectra with concordant periodic velocity shifts.

The tidal disruption event AT2019dsg is probably associated with a high-energy neutrino, suggesting that such events can contribute to the cosmic neutrino flux. The electromagnetic emission is explained in terms of a central engine, a photosphere and an extended synchrotron-emitting outflow.

The spectral properties of a short gamma-ray burst indicate that, contrary to expectations, it arose from the collapse of a massive star rather than from a compact binary merger. This discovery also confirms that most collapsars do not produce ultra-relativistic jets.

Using a new infrared spectropolarimeter at Palomar Observatory, the geometry of a number of supernova ejecta have been assessed, revealing a potential similarity in geometry between SN 2018hna and SN 1987A.

The optical follow-up and analysis of two neutron star–black hole merger candidates with the Zwicky Transient Facility did not yield viable counterparts. However, state-of-the-art kilonova models constrain the ejecta properties of these mergers.

Observations of an event (several energetic eruptions leading to a terminal explosion that is surprisingly hydrogen-rich) with the spectrum of a supernova do not match with other observations of supernovae.

Observations of declining ultraviolet emission from a type Ia supernova within four days of the explosion are as expected if material ejected by the supernova collided with a companion star, supporting the single degenerate channel model of supernova progenitors.