3. Overview of proposal preparation, validation, submission and selection
PIs of proposals will have to submit proposals to ISRO by the deadline given in the ISSDC website using AstroSat Proposal Processing System (APPS) software. APPS is available online through http://www.issdc.gov.in. APPS is not downloadable and cannot be used off-line. An APPS proposer’s guide is available in ISSDC and ASC websites which elaborates on the proposal submission procedure. A summary is provided in this section.
3.1 Proposal preparation pre-requisites
Depending on the scientific requirement, proposals to AstroSat can be submitted for observation with a single or more instruments. Proposals are to be made as per APPS proposer’s guide and this procedures document. Proposers can refer to redbook for the list of observed targets.
AstroSat proposals will require the following information at the minimum.
- Source coordinates, source angular size if extended, V magnitude, 2-10 keV flux, estimated count rates for different instruments, exposure times, UVIT bright source list, Astroviewer output for feasibility of observations of the target in pdf format. (use AstroSat tools listed in section 3.3)
- Instrument configuration parameters such as instrument mode, filter, etc. (Ref. Handbook)
- Scientific and technical justification.
3.2 APPS Instructions
Instructions to fill various entries within APPS to prepare proposals are available online. APPS proposer’s guide can also be referred for this purpose. Queries on APPS can be mailed to [email protected]for proposal preparation and submission. Queries will be answered on best effort basis.
3.3 Proposal Preparation Tools
Proposers can use the following tools in order to prepare an AstroSat proposal.
- Astroviewer (http://issdc.gov.in/astroviewer/index.html) to determine Astrosat visibility period for a target of interest.
- PIMMS (http://astrosat-ssc.iucaa.in:8080/WebPIMMS_ASTRO/index.jsp) to estimate source count rates.
- UVIT Exposure Time Calculator (http://uvit.iiap.res.in/Software/etc) to estimate required exposure time for an astronomical source.
- UVIT Bright Source Warning Tool (http://uvit.iiap.res.in/Software/bswt to set filters of the VIS channel for ensuring: a) safety of the detector against overexposure, b) adequacy of signal from stars in the field for tracking drift of the S/C.
- AstroSat Schedule viewer (https://webapps.issdc.gov.in/MCAP/) to check Tentative/Confirmed Target Schedule of Astrosat.
- Spectral simulation tools such as X-ray Spectral fitting package (XSPEC; https://heasarc.gsfc.nasa.gov/xanadu/xspec/), Interactive Spectral Interpretation System (ISIS ;http://space.mit.edu/CXC/ISIS/), Modelling and fitting package (Sherpa ; http://cxc.harvard.edu/sherpa4.4/) which are available online.