To minimise the timescale between the discovery-time (observation time of an LSQ frame containing a new transient) and the time an LSQ object appears as a new ticket in the PESSTO Marshall, we need to minimise the upper timescales shown in the following dataflow diagram.
Using a traffic light system for the time-scales:
Red = To be reduced
Orange = Could possibly be improved/unknown
Green = Cannot be reduced further
Note PESSTO users need to sign into the wiki to view the diagram. Once signed-in, to edit the diagram click on link at the bottom of image.
Examples of time delays
Latest discoveries from LSQ marked Discovery Date = 20140817
- LSQ14efn (LSQ link here) : first detection above V=20 was 20140805, 12 days before it appeared on the LSQ pages as discovered. What caused the delay ? As a counter example LSQ14eer was first detected at V=20 on 20140814 and appeared on LSQ pages on 20140816. Big difference between the latency for LSQ14efn and LSQ14eer
- LSQ14eft and LSQ14elf : discoveries on 20140817, but no recalibrated forced photometry.
Here's the the workflow for filtering LSQ objects:
- Reference image has a galaxy nearby
- If candidate is off the center of the galaxy, call it SNe nice
- If candidate is on center of galaxy call it SNe ?
- Reference image has a pointlike object at location of candidate , look at past history
- If no significant previous variability , SNe or Variable
- If history shows supernova-like light curve, call it SNe nice
- Reference image has nothing at location of candidate, look at past history
- If no significant previous history call it hostless SNe