Isn't 30 Pulses with 30 Repeating Pulses Kinda High for AstroPulse?


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Message boards : Number crunching : Isn't 30 Pulses with 30 Repeating Pulses Kinda High for AstroPulse?

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Message 1316594 - Posted: 17 Dec 2012, 22:51:36 UTC

I don't remember seeing one that high, however, I haven't been doing this very long. It finished early too, usually it takes around 40 minutes.
Found 30 single pulses and 30 repeating pulses, exiting.
percent blanked: 0.00

Interesting...

Josef W. Segur
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Message 1316673 - Posted: 18 Dec 2012, 3:19:02 UTC - in response to Message 1316594.

That's the astropulse early exit which serves the same function as result_overflow in MB tasks. It doesn't happen as often because there are separate limits of 30 for the two basic types, where MB quits on a total of all types it processes.

The zero blanking indicates there wasn't a huge amount of RFI, but that comes in all kinds and amounts so is the most likely cause. But we're here to find the very unlikely possibilities...

Joe

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Message 1316751 - Posted: 18 Dec 2012, 8:39:38 UTC - in response to Message 1316673.

That's the astropulse early exit which serves the same function as result_overflow in MB tasks. It doesn't happen as often because there are separate limits of 30 for the two basic types, where MB quits on a total of all types it processes.

The zero blanking indicates there wasn't a huge amount of RFI, but that comes in all kinds and amounts so is the most likely cause. But we're here to find the very unlikely possibilities...
Joe

It appears to have found an active area. Here's another one that threw down the slide-rule and raised it's hand in half the time as the last;
Found 30 single pulses and 30 repeating pulses, exiting.
percent blanked: 0.00


This one almost reached the point;
single pulses: 22
repetitive pulses: 30
percent blanked: 0.00


It would be nice to know if we are analyzing reruns of Gilligan's Island or if something more interesting is making all that noise. If I had the coordinates I could look it up on the program Starry Night and see if there are any Pulsars close by...

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Message 1316784 - Posted: 18 Dec 2012, 10:54:16 UTC - in response to Message 1316751.
Last modified: 18 Dec 2012, 10:54:40 UTC

If I had the coordinates I could look it up ...

The coordinates are in the WU files (both for astropulse and MB):
<astropulse_workunit> <workunit_header> <name>ap_12no12aa_B1_P1_00195_20121217_20994.wu</name> <tape_info> <name>12no12aa</name> <start_time>2456243.7446014</start_time> <last_block_time>2456243.7747359</last_block_time> <last_block_done>12547</last_block_done> <wu_count>195</wu_count> <beam>1</beam> <polarization>1</polarization> </tape_info> <receiver_cfg> <s4_id>6</s4_id> <name>Arecibo 1.4GHz Array, Beam 1, Pol 1</name> <beam_width>0.0500000007</beam_width> <center_freq>1420</center_freq> <latitude>18.3538056</latitude> <longitude>-66.7552222</longitude> <elevation>497</elevation> <diameter>168</diameter> <az_orientation>180</az_orientation> <az_corr_coeff length=99 encoding="x-csv"> -37,-6.05,92.35,-731.21,-1013.97,-24.53,-11.19,9.18,106.04,3.02,-1.74, -3.46,1.29 </az_corr_coeff> <zen_corr_coeff length=99 encoding="x-csv"> -57.55,-95.56,-4.13,141.69,677.51,-10.41,-7.71,-10.39,0.08,0.43,-0.62, 0.03,-0.36 </zen_corr_coeff> <array_az_ellipse>329.06</array_az_ellipse> <array_za_ellipse>384.005</array_za_ellipse> <array_angle>120</array_angle> </receiver_cfg> <workunit> <workunit_header> <name>11no12aa.16935.59941.140733193388036.10.240.vlar</name> <group_info> <tape_info> <name>11no12aa</name> <start_time>2456243.7219106</start_time> <last_block_time>2456243.7219106</last_block_time> <last_block_done>59941</last_block_done> <missed>0</missed> <tape_quality>0</tape_quality> <beam>1</beam> </tape_info> <name>11no12aa.16935.59941.4.10</name> <data_desc> <start_ra>4.7084258771624</start_ra> <start_dec>25.722075800679</start_dec> <end_ra>4.7084236273757</end_ra> <end_dec>25.722215030445</end_dec> <true_angle_range>0.012500221082135</true_angle_range> <time_recorded>Mon Nov 12 05:19:32 2012</time_recorded> <time_recorded_jd>2456243.7219094</time_recorded_jd> <nsamples>1048576</nsamples> <coords> <coordinate_t> <time>2456243.7219094</time> <ra>4.7084258771624</ra> <dec>25.722075800679</dec> </coordinate_t> <coordinate_t> <time>2456243.7219097</time> <ra>4.7084259071924</ra> <dec>25.722075998447</dec> </coordinate_t> .............


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Message 1316787 - Posted: 18 Dec 2012, 11:15:21 UTC - in response to Message 1316784.
Last modified: 18 Dec 2012, 11:31:08 UTC

If I had the coordinates I could look it up ...

The coordinates are in the WU files (both for astropulse and MB):
<astropulse_workunit> <workunit_header> <name>ap_12no12aa_B1_P1_00195_20121217_20994.wu</name> <tape_info> <name>12no12aa</name> <start_time>2456243.7446014</start_time> <last_block_time>2456243.7747359</last_block_time> <last_block_done>12547</last_block_done> <wu_count>195</wu_count> <beam>1</beam> <polarization>1</polarization> </tape_info> <receiver_cfg> <s4_id>6</s4_id> <name>Arecibo 1.4GHz Array, Beam 1, Pol 1</name> <beam_width>0.0500000007</beam_width> <center_freq>1420</center_freq> <latitude>18.3538056</latitude> <longitude>-66.7552222</longitude> <elevation>497</elevation> <diameter>168</diameter> <az_orientation>180</az_orientation> <az_corr_coeff length=99 encoding="x-csv"> -37,-6.05,92.35,-731.21,-1013.97,-24.53,-11.19,9.18,106.04,3.02,-1.74, -3.46,1.29 </az_corr_coeff> <zen_corr_coeff length=99 encoding="x-csv"> -57.55,-95.56,-4.13,141.69,677.51,-10.41,-7.71,-10.39,0.08,0.43,-0.62, 0.03,-0.36 </zen_corr_coeff> <array_az_ellipse>329.06</array_az_ellipse> <array_za_ellipse>384.005</array_za_ellipse> <array_angle>120</array_angle> </receiver_cfg> .............


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Notepad do not show the layout OK, use WordPad
(lines end with only LF (0A) (Unix style))

You only get Azimuth & Zenith readings for the AP? The Azimuth is 'upside down' similar to an optical scope? It would be much easier with a RA & Dec as with the MB. I'm not sure how to decipher the az & zen readings given. If you could work that out to simple AZ & ALT from Arecibo I could use that...

Where do you obtain a copy of the File? Say, this one; ap_12no12aa_B3_P0_00126_20121217_25009.wu

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Message 1316793 - Posted: 18 Dec 2012, 11:53:44 UTC - in response to Message 1316787.

Where do you obtain a copy of the File? Say, this one; ap_12no12aa_B3_P0_00126_20121217_25009.wu

If you're quick, you can download it from

http://boinc2.ssl.berkeley.edu/sah/download_fanout/194/ap_12no12aa_B3_P0_00126_20121217_25009.wu

(files are deleted from disk soon after validation)

For how to work out the download url, see my thread

WOW! Where on earth did that come from?

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Message 1316805 - Posted: 18 Dec 2012, 12:48:12 UTC - in response to Message 1316793.
Last modified: 18 Dec 2012, 13:13:59 UTC

Where do you obtain a copy of the File? Say, this one; ap_12no12aa_B3_P0_00126_20121217_25009.wu

If you're quick, you can download it from

http://boinc2.ssl.berkeley.edu/sah/download_fanout/194/ap_12no12aa_B3_P0_00126_20121217_25009.wu

(files are deleted from disk soon after validation)

For how to work out the download url, see my thread

WOW! Where on earth did that come from?

Thanks. The RA & Dec is a little lower in the data. I got;
<start>
<time>2456243.7641723</time>
<ra>6.1291691646237</ra>
<dec>18.6518676557</dec>
</start>
<end>
<time>2456243.7643278</time>
<ra>6.1291429443197</ra>
<dec>18.651741365036</dec>
From Arecibo, that would be around 0120 Nov 12th, pointed around AZ 86 degrees & ALT 77 degrees, in Orion. According to Starry Night, there were 2 Pulsars within 4 degrees of that location at that time. PSR0614+2229 & PSR0633+1746
How wide is the Arecibo FOV?

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Message 1317161 - Posted: 19 Dec 2012, 16:16:25 UTC
Last modified: 19 Dec 2012, 16:31:30 UTC

I'm still getting these noisy, short AstroPulses. I'm having a hard time getting any at all, but the last two I managed to receive have been;
Run time 1,418.59
single pulses: 27
repetitive pulses: 30
percent blanked: 0.00

&
Run time 882.86
Found 30 single pulses and 30 repeating pulses, exiting.
percent blanked: 2.88


What's up with that?

The ones on my other slower machine appear 'normal', Tasks for Computer 6796475

Of course, the slower machine is loaded with tasks whereas I can't seem to receive any on the faster machine...

Message boards : Number crunching : Isn't 30 Pulses with 30 Repeating Pulses Kinda High for AstroPulse?

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