Dear Keith, Here is a list of segments where the IRIG-B signal indicated questionable performance. The present consensus is that the handful of LHO segments should be vetoed as the loss is minimal, so why risk problems. For the numerous LLO segments: We should veto the segment with a ~1 s delay, as it might indicate an overall time-stamp problem. For the rest of the segments on the list we should indicate a local DCU problem. It is not clear at this point whether a synchronization failure on the DCU reading the IRIG-B signal has any global consequences. It is also not clear at this moment, whether the DCUs which does not have an IRIG-B recorder exhibited such behavior but it was undetected. Sincerely, Szabi and Daniel Note added by Keith: As I understand it, the timing problems marked by the DQ flag DCU_TIMING_OFFSET are probably unimportant to nearly every astrophysical analysis. The offsets are thought to affect only auxiliary PEM channels, and the offsets themselves are at the 1 ms level so that any reasonable PEM veto choices would be unaffected. [ Part 2: "Attached Text" ] #Possible overall timestamp problem: # #Seg# Start Stop Dur Min[ms] Max[ms] Ave[ms] Sig[ms] # 124 753155725 753156160 435 -1000.12 -1000.12 -1000.12 0.00 # #----------- # #DCU timing problem: # #Seg# Start Stop Dur Min[ms] Max[ms] Ave[ms] Sig[ms] # 8 751956468 751963188 6720 -1.22 -1.22 -1.22 0.00 8 751963188 751963202 14 -1.22 -1.22 -1.22 0.00 9 751966649 751968242 1593 -1.22 -1.22 -1.22 0.00 9 751968247 751974161 5914 -1.22 -1.22 -1.22 0.00 10 751974305 751983408 9103 -1.22 -1.22 -1.22 0.00 10 751983408 751983427 19 -1.22 -1.22 -1.22 0.00 11 752026180 752026207 27 -1.22 -1.22 -1.22 0.00 11 752026207 752026267 60 -1.22 -1.22 -1.22 0.00 11 752026267 752026327 60 -1.22 -1.22 -1.22 0.00 11 752026327 752026385 58 -1.22 -1.22 -1.22 0.00 13 752026455 752029507 3052 -1.22 -1.22 -1.22 0.00 14 752050172 752050221 49 -1.22 -1.22 -1.22 0.00 15 752050270 752051952 1682 -1.22 -1.22 -1.22 0.00 17 752053094 752053512 418 -1.22 -1.22 -1.22 0.00 18 752055872 752057232 1360 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