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Cosimo Q - for Stephen regarding spetroscopic addition to Lasair but confused about the various projects. 4most tides does not do targetted opportunities. So it might 20 to 100 days after the LSST discusovery. Can understand how SOXS can be contributebut not so much 4MOST/ So how much can these spectra actually controibute
SS - correct 4MOST cannot control the poiniting but likley to follow the LSST footprints. Can control the fibre poiting withing the fields of 4MOST. any thing brighter that 22 in the foiedl of 4MOST will have a fiber put on it. Speatra oif 20K to 30K transiernts plus 30K host glaxies. Cannot control exactly when that will be. challenge is to get objects out of alrte stream and onto the the 4MOST schedule. If can put the fiber on them then when an object is 4MOST obesvered, the then UK WP will reconginsed fiber is place, make esitamate and the information will go back to LAsair as a annotation. All of the data will be public in ESO archives. We will get information back asap into the broker.
Cosim Q - do you plan the same same thing for SOXS.
SJS - yes, there will be some link from Lasairt
Jakob Q - How well defined is the UK programme . Have the spectra discussed what they require in terms of triggering from LSST?
SJS - yes these discussions are happending at cocneptaual level. Triger are classsified as supernovae by sherlock( not an agn, not a variable star…). Essentially if bright enough for 4MOST to take a spectra then put a fibre on it.
Jakob - sounds like UK will only do supernvoa?
SJS - actually mean extragalactic transients
Question from Julien Q - Hardwar funding for Lasair - is this secured?
SJS - will be discussed in afternoon. Top level funding is secured. Lasair is a small part of the UK computing. LSSTUK is a small part of UK IRIS. So overall we are not the dominant partner and hence believe Lasair is safe. Andy agrees. Plan of UK expected requirements being put in to UKRI for the 10 years. This includes Lasair
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Matt - luckly numbers are not big so not a problem yet. Have been using a note in Google collab. In group have started tentative to build own marshall.
Cosimo Q - agree Agree color curve would be fantastic. …..What about using Gaussian processes to interpolate the light curves in order to produce colours (with uncertainties)?
Roy - happy to look at Gaussian code and include in the pipeline
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Differences between ZTF and LSST (Eric Bellm)
1405: Discussion
(need slides from Eric)
ZTF is on telescope that is almost 75 years old
(slide showing Slide 3 shows physical differences with Rubin. Only advantage for ZTF is in field of view. Total number of exposures per night will be similar on both telescopes.
Major difference is ZTF only processes the data once i.e. as live data comes off the telescope.
Q Julien on chat - Cutouts to be transmitted for LSST are template and difference. Why choosing template over science? The science one is probaby what I look first to judge quality.
A- The reason lost to pre-history. aim was to get 2 out of 3. Aim to go to 3 cut-outs.
Question: (Roy W asked) Can Lasair get awayt with using the LSST cutout service instead of saving them in our own database? How many can we fetch per day?
Answer: Do not think Lasair should use US cutout service. Capacity limits are not clear at moment, but cut-outs won’t become available until after the underlying images, which means a 3-day delay (in line with Government requirements)
1405: Discussion.Q Jakob - Regarding upper limits on forced photometry, will there always be 12 month limits on alerts with varying limits for forced photometry.?
A: Not built rigourously in pipelines, so remains conceptual. Should have history of every time observe a reason, and provide upper limit on noise estimate where don’t have forced photometry. This can change from night to night.
A: Details of workload management for PPDB are to be confirmed, though it is a concern. Several ways to think about this. Outpcome of Broker W/shop was action on project to offer a database export of PPDB (world-readable) for those who require significant information from DB.
Davy asked to clarify that forced photometry in alerts in one epoch behind actrual allert. Eric confirmed this was case. Getting triggering DSRs, but will. Eric will make a note and hope anomoly can be achieved without significant effort.