LuminousFastBlueOpticalTransient

class uvex_transients.transients.LFBOTs.LuminousFastBlueOpticalTransient(cosmology: Cosmology | None = None)

Luminous fast blue optical transient (LFBOT) population, e.g. AT2018cow-like events.

Modeled with LFBOTCoolingBlackbodySED (a Gaussian-rise/power-law-decline light curve with a smoothly cooling blackbody photosphere), a constant volumetric rate of 10 Gpc^-3 yr^-1 out to z=3 (Perley et al. 2026; Ho & Lu et al. 2026), and a 100-day duration window – generous relative to the SED’s own rise/decline timescales, to safely bound the slowly fading power-law tail.

See also

uvex_transients.models.lfbots.lfbots.LFBOTCoolingBlackbodySED

The SED this class pairs with DEFAULT_MODEL.

uvex_transients.transients.base.ExtragalacticTransient

The base class supplying rate/sampling machinery.

Methods

compute_all_sky_yield(duration)	Compute the expected intrinsic event count over the full sky.
compute_all_sky_yield_ci(duration)	Compute rate-only bounds on the expected all-sky intrinsic event count.
event_rate(z)	Compute the comoving event rate density at redshift(s) z, \(R(z;A)=A f(z)\).
rate_shape(z)	Return the (trivial, constant) rate shape of LFBOTs at a given redshift.
registry()	dict[str, type[TransientBase]]: A copy of every concrete subclass imported so far, keyed by class name.
sample_event_count(solid_angle[, duration, ...])	Sample the number of events in a given solid angle and duration.
sample_event_redshift(n_samples, *[, rng])	Draw n_samples redshifts from the rate-weighted redshift distribution.
sample_events_on_healpix_grid(nside, *, t_start)	Draw a Monte Carlo realization of events on a HEALPix grid, over a time window.

Attributes

DEFAULT_DURATION	The duration of this transient.
DEFAULT_Z_GRID_SIZE
DEFAULT_Z_LIM
RATE_CI	Multiplicative (lower, upper) 90% confidence factors on rate.
all_sky_rate	Expected all-sky event rate per observer year.
all_sky_rate_ci	Rate-only bounds on all_sky_rate.
cosmology	The cosmology used for luminosity-distance/volume calculations.
duration_limit	Upper bound on this transient's total duration.
effective_volume	\(\mathcal V\), the all-sky rate-weighted comoving volume.
integrated_rate	Expected event rate per observer time and solid angle.
integrated_rate_ci	Rate-only bounds on integrated_rate.
luminosity_distance_grid	\(D_L(z)\) at each point of redshift_grid.
rate	The volumetric LFBOT rate, constant in z (Perley/Ho & Lu et al. 2026).
rate_ci	(R_L, R_U), the confidence bounds on rate.
redshift_grid	The cached redshift grid backing integrated_rate/sampling.
redshift_grid_size	Number of points in redshift_grid; reassigning invalidates the rate cache.
redshift_limit	Upper redshift bound of redshift_grid; reassigning invalidates the rate cache.
sed	This instance's SED -- flux, magnitude, and spectrum evaluation all live here.