Too bad there is no technical description of the signals, what part of the spectrum they encompass, burst durations, repetition rate, etc. Not so interesting with no detail.
Quote from: MikeB on September 06, 2017, 06:48:32 PMToo bad there is no technical description of the signals, what part of the spectrum they encompass, burst durations, repetition rate, etc. Not so interesting with no detail.Ah, well if you go to an earlier National Geographic article about this phenomenon, you'll find a link included in the text that will take you to a page that will (if you wait a few seconds) open an in-depth letter in Nature that has plenty of technical details. Look for the paragraph beginning "It's the first time astronomers have caught a fast radio burst in the act of repeating" and click on the link to the Nature article you see there. Can't link it from here because it opens with a National Geographic token.
[-]maxcresswellturner 8343 points 5 days ago*x3 Has anyone actually listened to these? I've processed some of these recordings and now we can all analyze them further![EDIT: looks like this post has had quite a bit of reach, see here for original post: https://www.reddit.com/r/space/comments/6y3mv1/fast_radio_burst_121102_analyzed_audio/]As I like to play with sound here and there I was pretty immediately familiarized with the high pitched screech in these 2s clips as they sound like an accidental export of a track at 100x its regular BPM.I reduced speed of 9 of these recordings as provided by Harvard database (see below) to about 1% of the original speed and this quickly rendered an audible, irregularly oscillating hum between approx. 20-400Hz (low bass range).I've uploaded this to youtube here (https://youtu.be/XBEQXgUyR2c) and have a whole lot of downloads available below.
The hum does has a very eerie sound (like a low bassy pad) however there are two interesting aspects to these recordings. The first are the spikes in 4 of these recordings - they seem to exhibit some sort of doppler effect and sound as if an oscillating or pumping machine/engine is reaching maximum capacity (simply an example of what the effect sounds like) OR perhaps we are simply hearing the clearest recording of this signal at these spikes. Another interesting aspect is also the apparently silent portions of each recording during which a relatively long in duration white noise with a super low frequency of below 200Hz and a high frequency of 15-20 kHz (although this could be a white noise from the recording) (appearing at 3:30-4 minutes and 4:45-5 minutes into the below file).Note the pitch range in all of the recordings - they cut off from the low end at around 400Hz and cut in high end at 15-20kHz. Also note that the oscillation at normal activity is not consistent. Finally, the pulses are perfectly separated by equal intervals between each pulse.Could be a pulsar or a magnetar? Between you and me... if we're going to entertain the possibility of an intentional signal - my theory is an engine reaching max capacity or a signal being deflected unintentionally. (EDIT: I am NOT theorizing that this is an alien signal - my "what-if" theory was purely for entertainment purposes)For listening pleasure and intrigue I have compiled all of these processed files both in ZIP form below as well as a 4 minute wav file concatenating an original 2s FRB clip as well as peak activity from the files.GUIDE: 0m15-0m17 --- Original file (Rec 01) 0m30-1m00 --- AUD 01 (1m45-2m15) 1m15-1m45 --- AUD 02 (1m30-2m) 2m00-2m45 --- AUD 05 (1m30-2m15) 3m00-3m30 --- AUD 05 (2m45-3m15) (WATCH <200Hz) 3m45-4m15 --- AUD 07 (0m00-0m30) 4m30-5m15 --- AUD 07 (2m15-3m) (WATCH <200Hz)Processed concatenated (peak acitivty) file: http://www.mediafire.com/file/6bboetwy7m1y4x3/The_Sound_of_Fast_Radio_Burst_FRB_121102_SPIKES_CONCATENATED.wavProcessed ZIP files: https://www.mediafire.com/file/5tbqesqql0oc1ka/FRB%20121102%20Processed%20-%20ALL.zipOriginal files: https://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/QSWJE6