GLAST LAT Project Astrofisica Gamma dallo spazio: AGILE e GLAST 2 -3 LUGLIO 2007, ASDC – ESRIN,...

GLAST LAT Project

Astrofisica Gamma dallo spazio: AGILE e GLAST 2 -3 LUGLIO 2007, ASDC – ESRIN, Frascati

Collaborazione LATData policy

R. BellazziniINFN Pisa

Italian Project Manager

GLAST LAT Project


GLAST LAT Collaboration Organization

Publication Review Board

PI/SpokepersonP. Michelson

Instrument Scientist (IS)S. Ritz

LAT Collaboration SeniorScientist Advisory Committee

(SSAC)

N. Gehrels, Chair

EPO

Coordinator: L. Cominsky

LAT Collaboration Science Groups (LSG)

Analysis CoordinatorJ. McEnery

LAT Instrument ScienceOperations Center (ISOC)

ManagerR. Cameron

LAT Operations Steering Committee

PI & IS, co-chairs

Speaker’s Bureau

Chair: R.BellazziniMembership andCollaboration policies

Command, H&SFlight Software

Performance, Verificationand Optimization

Command, H&S

Science Products: Level1Pipeline and Quick look

Group 1

Group 3

Group 5

Group 7

Group 2

Group 4

Group 6

Group N

GLAST LAT Project


The GLAST LAT Collaboration consists of an international group of scientists that are:• organized to build the Large Area Telescope (LAT),• deliver this telescope to NASA for flight on the GLAST Mission• carry out the science investigation defined in the LAT Flight Proposal• support operation of the LAT instrument• deliver processed LAT data to the GLAST Mission Science Support Center.

The collaboration is supported by teams of engineers and technical staff, organized at various institutions involved in the collaboration.

The contributions of collaboration members and technical and engineering staff will be appropriately recognized through the GLAST LAT Collaboration Publication Policy.

GLAST LAT Collaboration Membership Policy

GLAST LAT Project


Collaboration Membership Categories

Membership Category Description

Member

Includes the Principal Investigator and the Co-Investigators listed in the Flight Proposal of November 1999. Also include scientists who are permanent staff members at a collaborating institution, spend at least 50% time on the GLAST LAT Project, and have well-defined, substantial responsibilities for either hardware, software, science analysis infrastructure, or team leadership at an institution with substantial responsibilities

Candidate new members must be proposed to the PI and accepted by the SSAC

Postdoctoral Scientist

Postdoctoral fellows at a collaborating institution who spend at least 50% time on the LAT Project

Graduate Student

Graduate students at a collaborating institution who conduct thesis research on GLAST science or LAT development at least 50% time

Affiliated Scientist(under review)

Scientists with interest in the LAT science program that spend substantially less than 50% time on the LAT project or who contribute a capability (e.g. VLBI radio observations of a LAT-detected source) to a relatively focused area of the LAT science program. Initially, this category includes Associate Scientists designated in the LAT Flight Proposal who satisfy the above criteria for Affiliated Scientist.

Candidate Affiliated Scientists must be proposed to the PI

GLAST LAT Project


Addition of Collaboration Members Criteria and Procedures

The nomination of Collaboration Members shall be made to the Principal Investigator by the member of the collaboration who is the institutional lead.

Two main criteria for addition: Candidate new members and their institution must provide a capability to fulfill a technical or scientific need recognized by the Principal Investigator Candidate new members shall submit a brief proposal for membership to the Principal Investigator for the PI’s approval. They should identify areas of scientific interest, technical capabilities, and anticipated sources and levels of support for their proposed activities. The institutional lead shall be identified in the proposal

Members who are institutional leads can involve postdoctoral scientists and graduate students in the work of the collaboration at their institution.

GLAST LAT Project


Removal or Withdrawal from the Collaboration

Members of the collaboration who are inactive in the LAT Project for 6 months or more will normally be removed from the collaboration membership list.

Members who anticipate that they will be inactive for 6 months or more can inform the Principal Investigator in writing and request an exception to this policy.

Any special arrangements, typically an extended period of eligibility for authorship on collaboration papers, will be negotiated with the Principal Investigator and reported to the SSAC.

Collaboration members may withdraw from the collaboration at any time. They shall inform the Principal Investigator in writing.

GLAST LAT Project


Publication Policy

Category I Category II

Analysis & Scientific Papers

• Papers reporting a substantially new scientific result, obtained either during the all-sky survey or from Collaboration Key Projects during subsequent phases; • Papers that require broad participation by collaboration (e.g., catalog)

Authorship: all active collaboration members are eligible; affiliated scientists and others considered on a case-by-case basis

• Papers involving specialized in-depth analysis or interpretation or follow-up with details on a previously published result

Authorship: collaboration members (or affiliated scientists) who have substantially contributed to the scientific ideas or analysis done in paper.

Instrument Papers

Papers that describe the overall instrument, its performance, calibration, etc.Authorship: all active collaboration members are eligible; affiliated scientists and others considered on a case-by-case basis

• Papers associated primarily with a particular instrument subsystem

Authorship: determined by Subsystem Managers of particular subsystem

GLAST LAT Project


Category III papers

Papers that do not fall clearly into either Category I or II are referred to as Category III papers. These papers do not use LAT data or LAT analysis results already published and do not use LAT resources such as instrument simulation tools. These papers have LAT collaboration members among the authors and are clearly related to LAT science. The collaborator(s) involved should inform the appropriate science group as a courtesy and allow the group to review the paper.

For example – Category III papers would include a paper presenting a theoretical model for explaining the properties of a source observed by the LAT and reported on in a prior LAT publication, or a paper on a new analysis technique.

GLAST LAT Project


The Policies Apply to:

• investigators associated with the instruments teams • the four Interdisciplinary Scientists (IDSs) chosen to advise the mission and to carry

out major data analysis projects in the first years of the mission • Guest Investigators (GIs) whose proposals have been accepted • all other scientist

and differ between the 3 mission Phases:

• Phase 0: the ~60 days after launch when the instruments are turned on and calibrated. During this phase the different operational modes will be tested, and bright sources will be observed.

• Phase 1: the first year of scientific operations. The instrument teams continue to calibrate their instruments while conducting a sky survey.

• Phase 2: the rest of the mission

The data policies is relatively restrictive in Phases 0 and 1

while it is relatively open in Phase 2.

Data Rights Policy

GLAST LAT Project


Phases 0 and 1 (the first ~14 months after launch):• the instrument teams will use the Level 1 data to calibrate their instruments

and refine the processing pipelines• photon lists from the LAT will be available only to investigators affiliated with

the instrument teams and the IDSs• the LAT team will release certain data during Phases 0 and 1 • the GIs may not alter the mission's observing plan • during this first year the IDS investigations can use only data acquired by

the planned operations of the GLAST Observatory, cannot require pointeted observations and will access to the data trough the instrument teams

Phase2:• data will be available to the whole scientific community as soon as Level 1

processing for data scientific analysis is performed and data transmitted to the GSSC.

• no restriction of an entire observation to portions of the FOV, no proprietary period of data

• The GSSC will maintain an accurate, timely, and publicly-available list of accepted investigations

Data Rights Policy

GLAST LAT Project


TransientsThroughout the mission the instrument teams will notify the scientific community that a transient has occurred and release relevant data. The decisions on which data are to be released will be based on advice from scientists analyzing the data and an evaluation of the scientific interest that the data might generate.

General guidelines :• Gamma-ray burst

– All data on gamma-ray bursts that trigger either the LAT or GBM will be released. The prompt data will include direction, fluence estimate and other key information about the burst immediately on discovery released.

• Blazars (and other sources of high interest)– 1020 preselected sources will be monitored continuously and the fluxes and

spectral characteristics will be posted on a publicly accessible web site. Other (1020) sources of scientifical interest will be added to the list during the survey.

• New transients– the community will be notified of a newly discovered source (flux level above 2-5

x106 ph/cm2 with E>100 MeV 100 counts/h in the LAT). The flux level is to be adjusted to set a release rate to 1-2 per week.

Data Rights Policy

GLAST LAT Project


Data Released by the LAT Team during the First Year

High-level data on transients and monitored sources consisting of flux (fluence) on various timescales, spectra, source position, and errors (including systematic) will be released in Phase 2; no release in Phase 1 of individual reconstructed photon events. • Gamma-ray Bursts

– On board detection released immediately. Refinement parameters as soon as available.

– Data after re-pointing released as soon as practical.

• Sources of interest– Data regularly released via web and updated weekly (fluxes, spectra, positions, errors).

– Latency beween receipt of Level 0 data and availability of processed h.l. data: from 2 weeks in first month of Phase 1 to 1 day (goal 6 hrs) after one year.

• Source list– Preliminary source catalog on the web including sources detected with very high

confidence (> 20 sigma) released approx 6 months after Phase 1 start.

– Periodically review of the monitored sources list with the GLAST Users' Committee and the Project Scientist.

GLAST LAT Project


LAT Data ProductsThe list of sources the LAT team will monitor during the first year is available at:

http://glast.gsfc.nasa.gov/ssc/data/policy/LAT_Monitored_Sources.html

• Daily

• Periodic

LAT events Large number of parameters describing a large subset of the events telemetered to the ground

LAT photons Selected parameters from the subset of events identified as gamma-ray photons

LAT Pointing and Livetime History

LAT orientation and mode at 30 s intervals; used to calculate exposure

LAT Point Source Catalog

Table of detected gamma-ray sources with derived information

LAT Burst Catalog List and characterization of gamma-ray bursts: location, duration, intensity

Interstellar Emission Model

Model for diffuse gamma-ray emission from the Milky Way, input for high-level data analysis; will be refined using GLAST data

GLAST LAT Project


• The instrument teams and the GSSC are developing a complete GLAST standard data analysis environment (SAE) publicly available on the web.

• The SAE will enable GLAST team members and guest investigators to extract scientific information from GLAST data.

• The SAE will be released well in time for the first observation cycle.

• The complete SAE will be released before launch. • Presently, it is foreseen to support both Linux and

Windows operating systems.

LAT Data Analysis

GLAST LAT Project Astrofisica Gamma dallo spazio: AGILE e GLAST 2 -3 LUGLIO 2007, ASDC – ESRIN,...

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