Cosmological Fast Optical Transients with the Zwicky Transient Facility: A Search for Dirty Fireballs

Abstract

Dirty fireballs are a hypothesized class of relativistic massive-star explosions with an initial Lorentz factor ${\Gamma }_{\mathrm{init}}$ below the ${\Gamma }_{\mathrm{init}}\sim 100$ required to produce a long-duration gamma-ray burst (LGRB), but which could still produce optical emission resembling LGRB afterglows. Here we present the results of a search for on-axis optical afterglows using the Zwicky Transient Facility (ZTF). Our search yielded seven optical transients that resemble on-axis LGRB afterglows in terms of their red colors ($g-r>0$ mag), faint host galaxy ($r>23$ mag), and rapid fading ($dr/dt>1$ mag/day). Spectroscopy of the transient emission within a few days of discovery established cosmological distances ($z=0.876$ to $z=2.9$) for six events, tripling the number of afterglows with redshift measurements discovered by optical surveys without a $\gamma$-ray trigger. Upon a retrospective search, four events (ZTF20abbiixp/AT2020kym, ZTF21aagwbjr/AT2021buv, ZTF21aakruew/AT2021cwd, ZTF21abfmpwn/AT2021qbd) turned out to have a likely associated LGRB (GRB200524A, GRB210204A, GRB210212B, GRB210610B), while three did not (ZTF20aajnksq/AT2020blt, ZTF21aaeyldq/AT2021any, ZTF21aayokph/AT2021lfa). Our search revealed no definitive new class of events: the simplest explanation for the apparently "orphan" events is that they were regular LGRBs missed by high-energy satellites due to detector sensitivity and duty cycle, although it is possible that they were intrinsically faint in $\gamma$-rays or viewed slightly off-axis. We rule out a scenario in which dirty fireballs have a similar energy per solid angle to LGRBs and are an order of magnitude more common. In addition, we set the first direct constraint on the ratio of the opening angles of the material producing $\gamma$-rays and the material producing early optical afterglow emission, finding that they must be comparable.

arXiv comment37 pages, 12 figures. Accepted for publication in ApJ

References in corpus (138)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• Planck 2015 results. XIII. Cosmological parameters
• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• Correcting for the Effects of Interstellar Extinction
• The Swift X-ray Telescope
• Spectra and Light Curves of Gamma-Ray Burst Afterglows
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• Overview of the DESI Legacy Imaging Surveys
• The Physics of Gamma-Ray Bursts
• The Fermi Gamma-Ray Burst Monitor
• The Burst Alert Telescope (BAT) on the Swift MIDEX Mission
• A Quantitative Comparison of SMC, LMC, and Milky Way UV to NIR Extinction Curves
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• ATLAS: A High-Cadence All-Sky Survey System
• Gamma-Ray Bursts
• Swope Supernova Survey 2017a (SSS17a), the Optical Counterpart to a Gravitational Wave Source
• Beaming in Gamma-Ray Bursts: Evidence for a Standard Energy Reservoir
• Are Gamma-Ray Bursts in Star Forming Regions?
• The Palomar Transient Factory: System Overview, Performance and First Results
• Short-Duration Gamma-Ray Bursts
• Jets in GRBs
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. II. UV, Optical, and Near-IR Light Curves and Comparison to Kilonova Models
• The Physics of Gamma-Ray Bursts and Relativistic Jets
• An online repository of Swift/XRT light curves of GRBs
• The Zwicky Transient Facility: Science Objectives
• Light Curves of the Neutron Star Merger GW170817/SSS17a: Implications for R-Process Nucleosynthesis
• Illuminating Gravitational Waves: A Concordant Picture of Photons from a Neutron Star Merger
• Calibration of X-ray absorption in our Galaxy
• The Dynamics and Light Curves of Beamed Gamma Ray Burst Afterglows
• WISeREP - An Interactive Supernova Data Repository
• The Shape of Spectral Breaks in GRB Afterglows
• General Relativistic Magnetohydrodynamic Simulations of Jet Formation and Large-Scale Propagation from Black Hole Accretion Systems
• The Combined Ultraviolet, Optical, and Near-Infrared Light Curves of the Kilonova Associated with the Binary Neutron Star Merger GW170817: Unified Data Set, Analytic Models, and Physical Implications
• How to Tell a Jet from a Balloon: A Proposed Test for Beaming in Gamma Ray Bursts
• The Expanded Very Large Array -- a New Telescope for New Science
• The afterglow, the redshift, and the extreme energetics of the gamma-ray burst 990123
• Poynting Jets from Black Holes and Cosmological Gamma-Ray Bursts
• The Fermi GBM Gamma-Ray Burst Spectral Catalog: Four Years Of Data
• Off-Axis Afterglow Emission from Jetted Gamma-Ray Bursts
• The Zwicky Transient Facility: Surveys and Scheduler
• The Afterglows of Swift-era Gamma-Ray Bursts. I. Comparing pre-Swift and Swift era Long/Soft (Type II) GRB Optical Afterglows
• The Fourth Fermi-GBM Gamma-Ray Burst Catalog: A Decade of Data
• Fundamental Physical Parameters of Collimated Gamma-Ray Burst Afterglows
• The Zwicky Transient Facility: Observing System
• The Observer's Guide to the Gamma-Ray Burst-Supernova Connection
• Events in the life of a cocoon surrounding a light, collapsar jet
• The Afterglows of Swift-era Gamma-Ray Bursts II.: Type I GRB versus Type II GRB Optical Afterglows
• The Zwicky Transient Facility Bright Transient Survey. II. A Public Statistical Sample for Exploring Supernova Demographics
• Simulations of Ultrarelativistic Magnetodynamic Jets from Gamma-ray Burst Engines
• The Propagation and Eruption of Relativistic Jets from the Stellar Progenitors of GRBs
• The 3rd Fermi GBM Gamma-Ray Burst Catalog: The First Six Years
• The Automated Palomar 60-Inch Telescope
• Proper image subtraction - optimal transient detection, photometry and hypothesis testing
• The SED Machine: a robotic spectrograph for fast transient classification
• Fully-Automated Reduction of Longslit Spectroscopy with the Low Resolution Imaging Spectrometer at Keck Observatory
• The Cow: discovery of a luminous, hot and rapidly evolving transient
• A Radio-Selected Sample of Gamma Ray Burst Afterglows
• The Fast, Luminous Ultraviolet Transient AT2018cow: Extreme Supernova, or Disruption of a Star by an Intermediate-Mass Black Hole?
• The nature of "dark" gamma-ray bursts
• The Afterglow of GRB 130427A from 1 to 10^16 GHz
• The Observable Signatures of GRB Cocoons
• PTF12os and iPTF13bvn. Two stripped-envelope supernovae from low-mass progenitors in NGC 5806
• Afterglow Observations of Fermi-LAT Gamma-Ray Bursts and the Emerging Class of Hyper-Energetic Events
• Off-Axis Gamma-Ray Burst Afterglow Modeling Based On A Two-Dimensional Axisymmetric Hydrodynamics Simulation
• Real-bogus classification for the Zwicky Transient Facility using deep learning
• Hyper-accreting black hole as GRB central engine. I: Baryon loading in GRB jets
• The GROWTH Marshal: A Dynamic Science Portal for Time-Domain Astronomy
• Failed gamma-ray bursts and orphan afterglows
• Orphan GRB radio afterglows: Candidates and constraints on beaming
• A Comparison of the Afterglows of Short- and Long-Duration Gamma-Ray Bursts
• A Comprehensive Study of Gamma-Ray Burst Optical Emission: I. Flares and Early Shallow Decay Component
• A Fully Automated Integral Field Spectrograph Pipeline for the SEDMachine: pysedm
• The Zwicky Transient Facility Alert Distribution System
• A Reverse Shock in GRB 130427A
• Machine Learning for the Zwicky Transient Facility
• Fireballs Loading and the Blast Wave Model of Gamma Ray Bursts
• The Detectability of Orphan Afterglows
• The Fermi GBM Gamma-Ray Burst Spectral Catalog: 10 Years of Data
• The Konus-Wind catalog of gamma-ray bursts with known redshifts. I. Bursts detected in the triggered mode
• The structure of hydrodynamic $\gamma$-ray burst jets
• Rebrightening of XRF 030723: further evidence for a two-component jet in gamma-ray burst
• The Koala: A Fast Blue Optical Transient with Luminous Radio Emission from a Starburst Dwarf Galaxy at $z=0.27$
• A Complete Survey of the Transient Radio Sky and Implications for Gamma-Ray Bursts, Supernovae, and other Relativistic Explosions
• Optical and near-infrared follow-up observations of four Fermi/LAT GRBs : Redshifts, afterglows, energetics and host galaxies
• Dark Bursts in the Swift Era: The Palomar 60 inch-Swift Early Optical Afterglow Catalog
• Gamma Ray Bursts Are Observed Off-Axis
• GRB afterglow light curves in the pre-Swift era - a statistical study
• Multi-Wavelength Observations of GRB 050820A: An Exceptionally Energetic Event Followed from Start to Finish
• ZTF Early Observations of Type Ia Supernovae I: Properties of the 2018 Sample
• A Morphological Classification Model to Identify Unresolved PanSTARRS1 Sources: Application in the ZTF Real-Time Pipeline
• The signature of the central engine in the weakest relativistic explosions: GRB100316D
• Kilonova Luminosity Function Constraints based on Zwicky Transient Facility Searches for 13 Neutron Star Mergers
• Fermi and Swift Gamma-Ray Burst Afterglow Population Studies
• Discovery of a Cosmological, Relativistic Outburst via its Rapidly Fading Optical Emission
• An Off-Axis Model for GRB 031203
• Energy Response of GECAM Gamma-Ray Detector Based on LaBr3:Ce and SiPM Array
• Fast-transient Searches in Real Time with ZTFReST: Identification of Three Optically-discovered Gamma-ray Burst Afterglows and New Constraints on the Kilonova Rate
• Theoretical Models of Optical Transients. I. A Broad Exploration of the Duration-Luminosity Phase Space
• Orphan Afterglows of Collimated Gamma-Ray Bursts: Rate Predictions and Prospects for Detection
• A Reverse Shock in GRB 160509A
• The distribution of equivalent widths in long GRB afterglow spectra
• GRB 071003: Broadband Follow-up Observations of a Very Bright Gamma-Ray Burst in a Galactic Halo
• Dirty Fireballs and Orphan Afterglows: A Tale of Two Transients
• A Spectacular Radio Flare from XRF 050416a at 40 days and Implications for the Nature of X-ray Flashes
• iPTF14yb: The First Discovery of a GRB Afterglow Independent of a High-Energy Trigger
• The bright optical/NIR afterglow of the faint GRB 080710 - Evidence for a jet viewed off axis
• The Konus-Wind catalog of gamma-ray bursts with known redshifts. II. Waiting mode bursts simultaneously detected by Swift/BAT
• The complex light-curve of the afterglow of GRB071010A
• A Reverse Shock in GRB 181201A
• The Needle in the 100 deg2 Haystack: Uncovering Afterglows of Fermi GRBs with the Palomar Transient Factory
• Discovery of the Luminous, Decades-Long, Extragalactic Radio Transient FIRST J141918.9+394036
• Observations of the GRB afterglow ATLAS17aeu and its possible association with GW170104
• A Search for Fast Optical Transients in the Pan-STARRS1 Medium-Deep Survey: M Dwarf Flares, Asteroids, Limits on Extragalactic Rates, and Implications for LSST
• The difficulty in using orphan afterglows to measure gamma-ray burst beaming
• Constraining the Beaming of Gamma-Ray Bursts With Radio Surveys
• Thermal and non-thermal emission from the cocoon of a gamma-ray burst jet
• Constraining the Kilonova Rate with Zwicky Transient Facility Searches Independent of Gravitational Wave and Short Gamma-ray Burst Triggers
• ZTF20aajnksq (AT2020blt): A Fast Optical Transient at $z\approx 2.9$ With No Detected Gamma-Ray Burst Counterpart
• Fast X-ray Transients and Gamma-ray Bursts: Constraints on Beaming
• Spectroscopy of the Type Ic Supernova SN\,2017iuk Associated with Low-redshift GRB\,171205A
• A tale of two transients: GW170104 and GRB170105A
• On-Axis Orphan Afterglows
• Coasting external shock in wind medium: an origin for the X-ray plateau decay component in Swift GRB afterglows
• Volumetric Survey Speed: A Figure of Merit for Transient Surveys
• Seeing-limited imaging sky surveys -- small vs. large telescopes
• High Energy Observations of XRF 030723: Evidence for an Off-axis Gamma-Ray Burst?
• iPTF Archival Search for Fast Optical Transients
• Zwicky Transient Facility constraints on the optical emission from the nearby repeating FRB 180916.J0158+65
• The Gamow Explorer: A gamma-ray burst observatory to study the high redshift universe and enable multi-messenger astrophysics
• Orphan GRB afterglow searches with the Pan-STARRS1 COSMOS survey
• Revealing nature of GRB 210205A, ZTF21aaeyldq (AT2021any), and follow-up observations with the 4K$\times$4K CCD Imager+3.6m DOT
• Late-Time Evolution and Modeling of the Off-Axis Gamma-ray Burst Candidate FIRST J141918.9+394036
• The origin of the early time optical emission of Swift GRB 080310
• Simultaneous observations of the northern TESS sectors by the Zwicky Transient Facility
• SRG/eROSITA prospects for detection of GRB afterglows
• Unveiling the enigma of ATLAS17aeu

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• A Search for Extragalactic Fast Blue Optical Transients in ZTF and the Rate of AT2018cow-like Transients
• GRB 221009A: An ordinary nearby GRB with extraordinary observational properties
• The curious case of EP241021a: Unraveling the mystery of its exceptional rebrightening
• EP240414a: Off-axis View of a Jet-Cocoon System from an Expanded Progenitor Star
• Constraining the long-lived supramassive neutron stars by magnetar boosted kilonovae
• Possible origin of AT2021any: a failed GRB from a structured jet
• A matched-filter approach to radio variability and transients: searching for orphan afterglows in the VAST Pilot Survey
• Prompt Detection of Fast Optical Bursts with the Vera C. Rubin Observatory
• Varying linear polarisation in the dust-free GRB 210610B
• Afterglow Linear Polarization Signatures from Steep GRB Jets: Implications for Orphan Afterglows
• Detecting the early optical flashes of gamma-ray bursts with small telescope arrays
• An extremely fast fading population II dwarf nova candidate: caught spectroscopically on the rise
• EP241113a: dissipative photospheric emission from a dirty fireball
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