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- CHIME finds 3/day
- Already published 500 FRBs in a catalogue that is public
- Published 3 papers on 18 repeaters including one with a 16-day activity window
- The next repeater catalog will be submitted soon.
- How many repeaters you ask?
- Complicated as localisation not great and many FRBs could have similar DMs, characteristics, etc
- Gold sample physical repeaters ~20
- Silver sample >20
- Extra odds and ends
- How many repeaters you ask?
- CHIME outriggers
- Baby CHIMES in different places in Canada and USA
- Detect FRBs at same time at multiple sites so will achieve mas localisation to bursts
- Do not have resources for optical/IR/multi-wavelength(MW) follow-up
- Extensive MW follow-up will likely occur for the first few
- Following those, MW follow-up only on interesting FRBs
- After this CHIME will start releasing FRBs as they go when the statistical regime is reached.
- Outriggers due to come online during the first half of 2023 - good tining for O4!
- Backlog of baseline processing of thousands of events
- Getting towards ~4000 bursts detected by CHIME but
- Most have not been vetted. CHIME is completely overwhelmed as there are not enough people to process the data
- Online triggering system released as VOEvent if it "thinks" something is FRB-like
- Most turn out to not be FRBs
- Subset are real, about ~1 in 4 or 1 in 5 informally
- We could rigger MWA on VOEvents
- Next project is to use CHIME to search for objects the vary on timescales of minutes and days
- Next step is for CHIME to be sensitive to intermediate times
- Timescales mins
- Timescales of days
- Efforts currently on the backburner as CHIME have prioritised repeaters and outriggers.
- Clancy - outriggers good for host galaxy association. On what timescale might we expect better information on a localised FRB?
- Bryan's response (from email follow-up with direct quotes from https://chime-frb-open-data.github.io/voevents-faq/):
- VOEvents carry almost all the header information, including the probability that it is astrophysical. The false alarm rates at various S/N is also quantified for the VOEvent users: see https://chime-frb-open-data.github.io/
- Real-time VOEvents are verified by humans only after a VOEvent has been published. Following human verification, an event may be found to be a false positive signal, for example, due to RFI contamination. While the real-time FRB detection pipeline performs multiple levels of RFI excision, it is not a perfect filter.
- Under the current regime, once per day around 22:00 Pacific Standard Time we will publish retraction VOEvents in bulk for all false positives classified in the previous 24-hour period.
- Bryan's response (from email follow-up with direct quotes from https://chime-frb-open-data.github.io/voevents-faq/):
- Citizen science project, hand classifying FRBs, take results and use as a training set for current auto-detection of FRBs.
- There is also a person in the loop that currently rates an event as good <10 mins. This could result in sending out additional VOEvent for confirmation or retraction.
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