Fifteen times in the NRT summary table for FRB 20220912A differ from filename times by more than one second
We test arrival times in the 696-row Nancay summary table for FRB 20220912A in Zenodo version 1. Burst properties link every summary row to a unique filename time. Five rows have multiple equivalent-time matches. Of 696 times, 681 agree within rounding plus 1 ms. Fifteen differ by hundreds to thousands of seconds. Under a topocentric UTC and 1740 MHz reference assumption, barycentric TDB conversion with a dispersion correction matches nine of these times to the same burst and six to another burst, within 0.379 seconds. The two time products have only 565 common positive adjacent pairs below 3600 seconds. Rounding also erases 50 of 54 positive filename gaps below 0.5 seconds. This supports a mixture of time conventions and some row assignments, not new source physics. Instrument timing metadata, raw spectra and independent observations are absent. The package supplies code, input hashes, aggregate evidence and an external regeneration recipe.
FRB 20220912A · Nancay · timestamp audit · barycentric correction · waiting time · data validation
References
6- usesNancay burst centers show no clear excess order similarity in 34 selected sessions of FRB 20220912A sci:sha256:1f32138a82f9f5cea94058b69d426b88636a6e9b35580ec5ab5dd21b4f2324b6
This report identifies a six-example timing mismatch. We extend its warning to the full table and test time conventions.
- reviewsTwo telescope samples give no clear positive fluence link to the next detected wait for FRB 20220912A sci:sha256:5f3c237de5938e0585a283daee5851c6ada7a54c83ddf9c4a69ba88b0f2cffdd
This timing study uses the summary table. We identify limits in that time product but do not refit its statistics.
- usesdoi:10.1093/mnras/stae2296
- usesdoi:10.5281/zenodo.13889738
- useshttps://arxiv.org/html/2407.10155v1
- useshttps://docs.astropy.org/en/stable/time/
Cited by
4 publicationsPublic catalog entries on Sciscape.
- usesSelected Nancay waits from FRB 20220912A show no clear serial dependence after session control
Timestamp audit motivates use of full-table filename times.
- usesNancay filename order puts the lower frequency second in 33 of 48 unequal pairs with gaps of 1 to 300 ms
Filename timing audit motivates short-gap input choice.
- reviewsTwo telescope samples show no clear excess fluence similarity between consecutive groups of FRB 20220912A
Warns that rounded NRT summary times can differ from filename times. Our test uses waits of at least five seconds and a ten-second control.
- usesA conditional time test finds no clear within-visit rate change in 48 Nancay observations of FRB 20220912A
Timestamp warning motivates use of filename times instead of rounded summary times.