GRBMX24

LSST:

opportunities for

fast transient science

University of Delaware

Department of Physics and Astronomy

Biden School of Public Policy and Administration

Data Science Institute

Rubin Legacy Survey of Space and Time

Deputy Project Scientist, Construction

Acting Head of Science, Operation

federica b. bianco

she/her

University of Delaware

Department of Physics and Astronomy

Biden School of Public Policy and Administration

Data Science Institute

Rubin Legacy Survey of Space and Time

Deputy Project Scientist, Construction

Acting Head of Science, Operation

federica b. bianco

she/her

this slide deck is live at https://slides.com/federicabianco/grbmx24

The best way to view the slides is on the web (to see videos and animations). A flat (PDF) version of this deck would be largely diminished

LSST:

opportunities for

fast transient science

Rubin Observatory

Site: Cerro Pachon, Chile

Funding: US NSF + DOE

To accomplish this, we need:

1) a large telescope mirror to be sensitive - 8m (6.7m)

2) a large field-of-view for sky-scanning speed - 10 deg2

3) high spatial resolution, high quality images - 0.2''/pixels

4) process images in realtime and offline to produce live alerts and catalogs of all 37B objects

Objective: provide a science-ready dataset to transform the 4 key science area

2025

@fedhere

At this level of precision,everything is variable, everything is blended, everything is moving.

SDSS

LSST-like HSC composite


Field of View' Image resolution' DDFs' Standard visit' Photometric precision' Photometric accuracy' Astrometric precision' Astrometric accuracy'	9.6 sq deg 0.2'' (seeing limited) 5 DDF 30 sec 5 mmag 10 mmag 10 mas 50 mas

' requirement: ls.st/srd

*simulation pstn-054.lsst.io

SDSS 2x4 arcmin sq griz

MYSUC (Gawiser 2014) 1 mag shallower than LSST coadds

	u,g,r,i,z,y
Photometric filters' saturation limit' # visits* mag single image* mag coadd* Nominal cadence	u, g, r, i, z, y ~15, 16, 16, 16, 15, 14 53, 70, 185, 192, 168, 165 23.34, 23.2, 24.05, 23.55 22.03 25.4, 26.9, 27.0, 26.5, 25.8, 24.9 2-3 visits per night

At this level of precision,everything is variable, everything is blended, everything is moving.

' requirement: ls.st/srd

*simulation pstn-054.lsst.io

Rubin LSST Science Collaborations

8 SCs - 6 continents - 2000 people - 25 countries

number are quite a bit larger now! this plot is from ~2022

on the right is a connectivity network for the SCs

Rubin Observatory Status

5 / 2019

May 2022 - Telescope Mount Assembly

12/2022 TMA in action

weight 2e5 kg, max slew rate 0.2 rad/s

Most of the weight in a 10m disk
Angular momentum

5,000,000 ~\mathrm{kg~m^2 s^{-1}}

The DOE LSST Camera - 3.2 Gigapixel

3024 science raft amplifier channels

Camera and Cryostat integration completed at SLAC in May 2022,

Shutter and filter auto-changer integrated into camera body

LSSTCam undergoing final stages of testing at SLAC

July 2024 ComCam installed on the telescope after M1M2 installation - Comcam is a 144Mpix version of LSSTCam

artist (me) impression of the first image taken by ComCam

https://community.lsst.org/c/news/7

telescope's optical alignment close to optimal and the system delivering an image quality of around 1.5 arcseconds.

The Data Management system effectively processed images, providing astrometric and photometric solutions.

AOS commissioning successfully running the system in a closed-loop configuration.

Continuous improvements in image quality were observed, achieving sub-arcsecond PSF FWHM

achieving PSF FWHM of 0.7" on several nights.

Observations for science pipeline commissioning continued, including filter exchanges and initial tests of difference image analysis and photometric calibration.

AOS closed loop was operating with over 90% of the optical degrees of freedom enabled.

Full-color six-band (ugrizy) coverage of the Extended Chandra Deep Field South (ECDFS) LSST Deep Drilling Field.

Flux measurements demonstrated high repeatability across multiple nights and varying airmass.

The Data Management System successfully processed data with Difference Image Analysis, producing candidate sources and alerts.

Efforts were focused on increasing operational efficiency, including shutter open efficiency and telescope motion speed.

Repeated imaging in r and i bands allowed to build templates for six target fields.

First association of Solar System Object detections

A new single-night record of 99 in-focus visits taken with the automated scheduler.

LSST

data products

federica bianco - fbianco@udel.edu

Time

Domain

Science

Static

Science

Alerts based

Catalog based

Deep stack

based

Deep stack

based

Rubin Observatory LSST

federica bianco - fbianco@udel.edu

Data Products

federica bianco - fbianco@udel.edu

data right holders only

federica bianco - fbianco@udel.edu

Rubin In-Kind Contribution Program

https://www.lsst.org/scientists/in-kind-program

federica bianco - fbianco@udel.edu

world public!

10Million alerts per night!

LSST survey strategy optimization

Exploring the Transient and Variable Optical Sky

LSST Science Book (2009)

Operation Simulator (OpSim)

simulates the catalog of LSST observations + observation properties

Metric Analysi Framwork (MAF)

Python API to interact with OpSims specifying science performance on a science case with a metric

Lynne Jones

Peter Yoachim

~100s simulations

~1000s MAFs