Multi-messenger constraints on LIGO/Virgo/KAGRA gravitational wave binary black holes merging in AGN disks

Tomás Cabrera, Antonella Palmese, Maya Fishbach

Dark Energy Survey Year 1 Results: Cosmological Constraints from Cluster Abundances and Weak Lensing

DES Collaboration, Tim Abbott, Michel Aguena +129

Report of the Topical Group on Dark Energy and Cosmic Acceleration: Complementarity of Probes and New Facilities for Snowmass 2021

Brenna Flaugher, Vivian Miranda, David J. Schlegel +27

GW190521 from the Merger of Ultra-Dwarf Galaxies

Antonella Palmese, Christopher J. Conselice

GRB 260310A/SN 2026fgk: Photometric and Spectroscopic Evolution of a Nearby GRB-Supernova and an Exceptionally Bright Afterglow at z=0.153

Brendan O'Connor, Malte Busmann, Xander J. Hall +24

Cosmology Intertwined II: The Hubble Constant Tension

Eleonora Di Valentino, Luis A. Anchordoqui, Ozgur Akarsu +90

Gravitational Wave Cosmology

Antonella Palmese, Simone Mastrogiovanni

Measuring the dust attenuation law of galaxies using photometric data

Cole Meldorf, Antonella Palmese, Samir Salim

The Lazuli Space Observatory: Architecture & Capabilities

Arpita Roy, Stuart Feldman, Pete Klupar +51

The Gravity Collective: A Search for the Electromagnetic Counterpart to the Neutron Star-Black Hole Merger GW190814

Charles D. Kilpatrick, David A. Coulter, Iair Arcavi +79

The distant, galaxy cluster environment of the short GRB 161104A at $z\sim 0.8$ and a comparison to the short GRB host population

Anya E. Nugent, Wen-fai Fong, Yuxin Dong +9

The redshift distribution of Einstein Probe transients supports their relation to gamma-ray bursts

Brendan O'Connor, Paz Beniamini, Eleonora Troja +9

A Spectroscopic Road Map for Cosmic Frontier: DESI, DESI-II, Stage-5

David J. Schlegel, Simone Ferraro, Greg Aldering +62

Dark Energy Survey Identification of A Low-Mass Active Galactic Nucleus at Redshift 0.823 from Optical Variability

Hengxiao Guo, Colin J. Burke, Xin Liu +56

Multi-Messenger Astronomy with Extremely Large Telescopes

Ryan Chornock, Philip S. Cowperthwaite, Raffaella Margutti +82

The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics

Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533

Cosmology Intertwined I: Perspectives for the Next Decade

Eleonora Di Valentino, Luis A. Anchordoqui, Ozgur Akarsu +89

Connecting current and future dual AGN searches to LISA and PTA gravitational wave detections

Nianyi Chen, Yihao Zhou, Ekaterine Dadiani +10

Comprehensive X-ray Observations of the Exceptional Ultra-long X-ray and Gamma-ray Transient GRB 250702B with Swift, NuSTAR, and Chandra: Insights from the X-ray Afterglow Properties

Brendan O'Connor, Ramandeep Gill, James DeLaunay +22

Searching for electromagnetic emission in an AGN from the gravitational wave binary black hole merger candidate S230922g

Tomás Cabrera, Antonella Palmese, Lei Hu +17

Standard Siren Cosmology with Gravitational Waves from Binary Black Hole Mergers in Active Galaxy Nuclei

Clecio R. Bom, Antonella Palmese

EP260321a/SN 2026gzf: The Faintest Shock Breakout Associated with a Broad-Lined Supernova

Brendan O'Connor, Xander J. Hall, Malte Busmann +33

Wide Jets or Low Rates: Reconciling Short GRB and Gravitational-Wave Neutron Star Merger Rates

Keerthi Kunnumkai, Antonella Palmese, Brendan O'Connor +2

Rubin ToO 2024: Envisioning the Vera C. Rubin Observatory LSST Target of Opportunity program

Igor Andreoni, Raffaella Margutti, John Banovetz +86

The DESI Transients Survey: Legacy Classifications and Methodology

Xander J. Hall, Antonella Palmese, Segev BenZvi +56

A Targeted Search for Variable Gravitationally Lensed Quasars

William Sheu, Xiaosheng Huang, Aleksandar Cikota +4

Weak-lensing calibration of a stellar mass-based mass proxy for redMaPPer and Voronoi Tessellation clusters in SDSS Stripe 82

Maria E. S. Pereira, Marcelle Soares-Santos, Martin Makler +9

Challenges for Fast Radio Bursts as Multi-Messenger Sources from Binary Neutron Star Mergers

Mohit Bhardwaj, Antonella Palmese, Ignacio Magaña Hernandez +2

Kilonova constraints for the LIGO/Virgo/KAGRA neutron star merger candidate S250206dm: GW-MMADS observations

Lei Hu, Tomás Cabrera, Antonella Palmese +35

Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies

Elcio Abdalla, Guillermo Franco Abellán, Amin Aboubrahim +200

Extragalactic Magnetar Giant Flare GRB 231115A: Insights from Fermi/GBM Observations

Aaron C. Trigg, Rachael Stewart, Alex Van Kooten +22

The Curious Case of PHL 293B: A Long-Lived Transient in a Metal-Poor Blue Compact Dwarf Galaxy

Colin J. Burke, Vivienne F. Baldassare, Xin Liu +51

SOAR/Goodman Spectroscopic Assessment of Candidate Counterparts of the LIGO-Virgo Event GW190814

Douglas Tucker, Matthew Wiesner, Sahar Allam +140

Kilonova emission from GW230529 and mass gap neutron star-black hole mergers

Keerthi Kunnumkai, Antonella Palmese, Mattia Bulla +3

Long GRB 250916A: an Off-axis Powerlaw Jet with Thermal Cocoon

Utkarsh Pathak, Sameer K. Patil, Hitesh Tanenia +22

AT2025ulz and S250818k: Deep X-ray and radio limits on off-axis afterglow emission and prospects for future discovery

Brendan O'Connor, Roberto Ricci, Eleonora Troja +15

Is GW170817 a Multimessenger Neutron Star-Primordial Black Hole Merger?

Yu-Dai Tsai, Antonella Palmese, Stefano Profumo +1

BOOM and Babamul: a real-time, multi-survey, optical alert broker system operating at scale

Theophile Jegou du Laz, Michael W. Coughlin, Peter Bachant +17

ZTF25abjmnps (AT2025ulz) and S250818k: A Candidate Superkilonova from a Sub-threshold Sub-Solar Gravitational Wave Trigger

Mansi M. Kasliwal, Tomas Ahumada, Robert Stein +61

LIGO/Virgo/KAGRA neutron star merger candidate S250206dm: Zwicky Transient Facility observations

Tomás Ahumada, Shreya Anand, Mattia Bulla +49

Enabling Kilonova Science with Nancy Grace Roman Space Telescope

Igor Andreoni, Michael W. Coughlin, Alexander W. Criswell +16

The Pantheon+ Analysis: Cosmological Constraints

Dillon Brout, Dan Scolnic, Brodie Popovic +43

Target of Opportunity Observations of Gravitational Wave Events with Vera C. Rubin Observatory

Igor Andreoni, Raffaella Margutti, Om Sharan Salafia +52

AT2025ulz and S250818k: Investigating early time observations of a subsolar mass gravitational-wave binary neutron star merger candidate

Xander J. Hall, Malte Busmann, Hauke Koehn +32

A new bump in the night: evidence of a new feature in the binary black hole mass distribution at $70~M_{\odot}$ from gravitational-wave observations

Ignacio Magaña Hernandez, Antonella Palmese

Dark Matter Science in the Era of LSST

Keith Bechtol, Alex Drlica-Wagner, Kevork N. Abazajian +177

Gravitational Waves from Black Holes in Merging Ultra-Dwarf Galaxies

Christopher J. Conselice, Rachana Bhatawdekar, Antonella Palmese +1

The host galaxies and merger environments of short and long gamma-ray bursts producing kilonovae

Hannah Skobe, Brendan O'Connor, Antonella Palmese +3

AT2025ulz and S250818k: Leveraging DESI spectroscopy in the hunt for a kilonova associated with a sub-solar mass gravitational wave candidate

Xander J. Hall, Antonella Palmese, Brendan O'Connor +47

The rate of extreme coronal line emitting galaxies in the Sloan Digital Sky Survey and their relation to tidal disruption events

Joseph Callow, Or Graur, Peter Clark +27

A standard siren measurement of the Hubble constant using gravitational wave events from the first three LIGO/Virgo observing runs and the DESI Legacy Survey

Antonella Palmese, Clecio R. Bom, Sunil Mucesh +1

On the association of GW190425 with its potential electromagnetic counterpart FRB 20190425A

Ignacio Magaña Hernandez, Virginia D'Emilio, Soichiro Morisaki +2

Expediting DECam Multimessenger Counterpart Searches with Convolutional Neural Networks

Adam Shandonay, Robert Morgan, Keith Bechtol +11

Discovery of a Supernova Following the Einstein Probe Transient EP250302a at z = 1.131

Brendan O'Connor, Malte Busmann, James Freeburn +7

The DESI Experiment Part II: Instrument Design

DESI Collaboration, Amir Aghamousa, Jessica Aguilar +290

DES Science Portal: Computing Photometric Redshifts

Julia Gschwend, Aurelio Carnero Rosell, Ricardo Ogando +68

The MOST Hosts Survey: spectroscopic observation of the host galaxies of ~40,000 transients using DESI

Maayane T. Soumagnac, Peter Nugent, Robert A. Knop +54

The Dark Energy Survey Supernova Program results: Type Ia Supernova brightness correlates with host galaxy dust

Cole Meldorf, Antonella Palmese, Dillon Brout +68

OzDES Reverberation Mapping Program: Lag recovery reliability for 6-year CIV analysis

Andrew Penton, Umang Malik, Tamara Davis +66

Probing gravity and growth of structure with gravitational waves and galaxies' peculiar velocity

Antonella Palmese, Alex G. Kim

Snowmass2021 Cosmic Frontier CF6 White Paper: Multi-Experiment Probes for Dark Energy -- Transients

Alex G. Kim, Antonella Palmese, Maria E. S. Pereira +14

Candidate Periodically Variable Quasars from the Dark Energy Survey and the Sloan Digital Sky Survey

Yu-Ching Chen, Xin Liu, Wei-Ting Liao +62

A Fast Radio Burst in a Compact Galaxy Group at $z$~1

Alexa C. Gordon, Wen-fai Fong, Sunil Simha +14

Deep Hubble Space Telescope Observations of GW170817: Complete Light Curves and the Properties of the Galaxy Merger of NGC 4993

Charles D. Kilpatrick, Wen-fai Fong, Peter K. Blanchard +10

First Results from the LSST Shadow Survey: The Restless Luminous Blue Variable AT2017des in the Virgo-Cluster Galaxy, NGC4532

Conor L. Ransome, Bhagya M. Subrayan, David J. Sand +66

One Year and One Night to 1% in $\mathbf{H_0}$: Efficient Spectroscopic Strategy for Dark Siren Cosmology

Yixuan Dang, Ariel J. Amsellem, Ignacio Magaña Hernandez +2

Astrophysics informed Gaussian processes for gravitational-wave populations: Evidence for the onset of the pair-instability supernova mass gap

Ignacio Magaña Hernandez, Antonella Palmese

Cosmic Pairs: A DESI Census of Dual and Offset AGN as Precursors to Massive Black Hole Binaries

Ekaterine Dadiani, Antonella Palmese, Yihao Zhou +52

The paper presents a large, uniformly selected spectroscopic catalog of dual and offset active galactic nuclei from the first DESI data release, analyzing their host galaxy propert…

Detecting prompt and afterglow jet emission of gravitational wave events from LIGO/Virgo/KAGRA and next generation detectors

Ravjit Kaur, Brendan O'Connor, Antonella Palmese +1

The Hitchhiker's guide to the galaxy catalog approach for gravitational wave cosmology

Jonathan R. Gair, Archisman Ghosh, Rachel Gray +28

Optical/infrared observations of the extraordinary GRB 250702B: a highly obscured afterglow in a massive galaxy consistent with multiple possible progenitors

Jonathan Carney, Igor Andreoni, Brendan O'Connor +31

Constraints on dark matter to dark radiation conversion in the late universe with DES-Y1 and external data

Angela Chen, Dragan Huterer, Sujeong Lee +81

Gravitational wave cosmology and astrophysics with large spectroscopic galaxy surveys

Antonella Palmese, Or Graur, James T. Annis +12

Deep Drilling in the Time Domain with DECam: Survey Characterization

Melissa L. Graham, Robert A. Knop, Thomas Kennedy +41

TDE 2025abcr: A Tidal Disruption Event in the Outskirts of a Massive Galaxy

Robert Stein, Jonathan Carney, Charlotte Ward +27

EP250827b/SN 2025wkm: An X-ray Flash-Supernova Powered by a Central Engine and Circumstellar Interaction

Gokul P. Srinivasaragavan, Dongyue Li, Xander J. Hall +100

Dwarf AGNs from Optical Variability for the Origins of Seeds (DAVOS): Insights from the Dark Energy Survey Deep Fields

Colin J. Burke, Xin Liu, Yue Shen +69

Cosmology Intertwined IV: The Age of the Universe and its Curvature

Eleonora Di Valentino, Luis A. Anchordoqui, Ozgur Akarsu +88

Do LIGO/Virgo black hole mergers produce AGN flares? The case of GW190521 and prospects for reaching a confident association

Antonella Palmese, Maya Fishbach, Colin J. Burke +2

Probing galaxy evolution in massive clusters using ACT and DES: splashback as a cosmic clock

Susmita Adhikari, Tae-hyeon Shin, Bhuvnesh Jain +113

A Natural $\gtrsim 100\times$ Telescope: Discovery of the Strongly Lensed Type II SN 2025mkn at $z=1.37$

Cameron Lemon, Ariel Goobar, Joel Johansson +90

Cosmology with the Laser Interferometer Space Antenna

Pierre Auclair, David Bacon, Tessa Baker +177

The curious case of EP241021a: Unraveling the mystery of its exceptional rebrightening

Malte Busmann, Brendan O'Connor, Julian Sommer +19

Long-term follow-up observations of extreme coronal line emitting galaxies

Peter Clark, Or Graur, Joseph Callow +40

Cosmology Intertwined III: $f σ_8$ and $S_8$

Eleonora Di Valentino, Luis A. Anchordoqui, Ozgur Akarsu +89

Electromagnetic Follow-up of the Sub-Solar Mass Gravitational Wave Candidate S251112cm: Kilonova Constraints and a Coincident IIb Supernova

Xander J. Hall, Tomas Ahumada, Julius Gassert +25

Massive Black Hole Binaries as LISA Precursors in the Roman High Latitude Time Domain Survey

Zoltán Haiman, Chengcheng Xin, Tamara Bogdanović +27

Spectral siren cosmology from gravitational-wave observations in GWTC-4.0

Ignacio Magaña Hernandez, Antonella Palmese

GRB 250704B: An Off-axis Short GRB with a Long-Lived Afterglow Plateau

Vishwajeet Swain, Tomás Ahumada, Sameer K. Patil +27

A GPU-Accelerated Transient Detection Pipeline for DECam Time-Domain Surveys

Lei Hu, Tomás Cabrera, Antonella Palmese +8

SN 2025adpq: A Type Ia supernova in a collisional ring formed during a major galaxy merger

Brendan O'Connor, Xander J. Hall, Tomas Cabrera +16

Detecting electromagnetic counterparts to LIGO/Virgo/KAGRA gravitational wave events with DECam: Neutron Star Mergers

Keerthi Kunnumkai, Antonella Palmese, Amanda M Farah +7

The DESI Experiment Part I: Science,Targeting, and Survey Design

DESI Collaboration, Amir Aghamousa, Jessica Aguilar +290