GLAST LAT Project Ground Software Workshop, July 15-18, 2003
EGRET >300 MeV
What we got done at the meeting
What needs to get done
Getting to DC1
Who is doing what?
Seth Digel
HEPL/Stanford Univ.
18 July 2003
1

GLAST LAT Project Ground Software Workshop, July 15-18, 2003
• Talks
– You heard them, too
• Working sessions-type topics
– Observation simulation
• Simulated data sets, variable (periodic) sources, handling multiple classes of events; Claudia Cecchi will be coordinator of obs. sim. science tools with Jim Chiang
– Graphics – AIDA & Plplot
• Round table forum. We’ve talked ourselves out of AIDA (too much overhead just for plotting) and raw Plplot, may be talking ourselves into
ROOT
– HOOPS – how-to
•
How went?
– Data layer – core developer-level discussion: what it can do for you
•
Binned event class (data type) implemented; need one or two more for
GOODI to be useful for the DC1 science tools
–
D1 & D2 details
– like how to communicate with them
• How went? Beowulf at SLAC has been rediscovered with Julie
McEnery’s help
2

GLAST LAT Project Ground Software Workshop, July 15-18, 2003
– Source detection
• Variable/moving sources, tradeoffs in response functions, computation time; N-dim Bayesian blocks, ICA, wavelet, other alternative methods for source detection?
– Interstellar emission model
– D3
• Parameterization of response functions, interface work
– Data products
•
ICD between IOC and SSC; L0.5 data
3

GLAST LAT Project Ground Software Workshop, July 15-18, 2003
• [Out of our hands] Derivation of LAT response functions
– Parameterizing them, studying them for likelihood analysis, will be in our hands
– Biggest concern in terms of the end-to-end goal of DC1
– For DC1 goals (at least as far as science tools go), we could get by with GLAST25 response functions and our high-level simulators
• D1& D2
– For D1, need to converge on contents. Sensible suggestion: include the variables that are input to the classification trees
[although then would have to include ‘flattening’ information]
– For development, keeping up on the LAT side is the issue
• Likelihood tool
– Source model definition, commanding, user documentation
– Wilks’ theorem?
4

GLAST LAT Project Ground Software Workshop, July 15-18, 2003
• Observation simulation
– obsSim & Light Simulator cross check
– Basically close to where we want to be for DC1; livetime <> real time; read D2 output
• Map generation
–
Can DS9 do what we want? Maybe with exposure calculation utility
• L1 pipeline
– Waiting for OPUS code; in the meantime can work on the scripts that we’ll feed opus
– We’ll want to provide input regarding the ‘Monte Carlo Truth’ sky
• Core
– Graphics – what tools need it for DC1?
– HOOPS and GOODI – really should be in there; don’t foresee that this will be a problem
5

GLAST LAT Project Ground Software Workshop, July 15-18, 2003
• What do we need from DC1?
– Technical aspects
– Also to get software in a state where non-developer users can use it
– install it, understand it, run it
• For collaboration meeting in September, need to introduce the
DC1-era science tools
• WBS says that we will have a month of testing our tools in advance of release (pipeline → D1 & D2→ likelihood analysis
(with exposure calc.) → (pseudo)science
• ‘Release’ means more than a tag
6

GLAST LAT Project Ground Software Workshop, July 15-18, 2003
• Core – Science Tools Core
–
Development environment, release manager
–
HOOPS (OO PIL)
– GOODI – data representation, i/o
– Plplot/AIDA
• D1 database and supporting utilities – DB & related utils
• D2 pointing/livetime/mode history – DB & related utils
• D3 response functions, form and interface – Davis & ?
• O1 orbit and attitude simulation – Obs. sim
• O2 & interim simulated data set – Obs. sim
Ready
Signs of progress
Signs of life
Moribund
• A1 & supporting tools
–
Functional prototype likelihood analysis
– Chiang, Source detection
– Source model definition - ?
– Exposure calculation? – Chiang, Source detection
–
Response function visualization - ?
• Map generation – counts, exposure, intensity, model - ?
7

GLAST LAT Project Ground Software Workshop, July 15-18, 2003
Pulsar period search (A4)
Pulsar ephem. (D4)
Ephemeris extract (U11)
Level 0.5
Event display (UI1)
Level 1 (D1)
Data extract
(U1)
Pointing/livetime history (D2)
Pt.ing/livetime extractor (U3)
Arrival time correction (U10)
Pulsar phase assign (U12)
Exposure calc. (U4)
Pulsar profiles (A3) 1
Source model def. tool (U7)
Likelihood (A1)
LAT Point source catalog (D5)
Catalog
Access (U9)
Astron.
catalogs (D6)
Src. ID (A2)
Alternative source for testing highlevel analysis
Observation simulator (O2)
Alternative for making additional cuts on alreadyretrieved event data
Data subselection (U2)
Pt.ing/livetime simulator (O1)
Pt.ing/livetime extractor (U3)
1 This tool also performs periodicity tests and the results can be used to refine ephemerides
2 These tools can also take as input binned data from other instruments, e.g., GBM; the corresponding DRMs must also be available.
Interstellar em.
model (U5)
IRFs (D3)
Map gen
(U6)
IRF visualization (U8)
GRB unbinned spectral analysis (A9)
GRB LAT DRM gen. (U14)
GRB spectral analysis (A8) 2
GRB rebinning
(A6) 2
GRB event binning (A5)
GRB spectral-temporal modeling (A10)
GRB visualization (U13)
GRB temporal analysis (A7) 2
User Interface aspects of the standard analysis environment, such as
Image/plot display (UI2), Command line interface & scripting (UI4), and
GUI & Web access (UI5) are not shown explicitly.
8
14 Sept 2002