Changes between Version 8 and Version 9 of PS1_GPC1_Magic_Status_20090628

Timestamp:

Jun 28, 2009, 9:57:29 PM (17 years ago)

Author:

eugene

Comment:

--

PS1_GPC1_Magic_Status_20090628

@@ -37 +37 @@
 The other features are persistent star trails which were not corrected by burntool.  These structures are seen in other parts of this exposure.  I am somewhat surprised that burntool left these behind.  It is certain that this exposure was processed by burntool, but I wonder if there was a failure of some sort in the processing or the sequencing.  We can double check that burntool has entries from the previous exposures.  It might simply be that the decay timescale is not long enough so that these escaped the burntool algorithm.  Assuming that burntool was correctly run on the exposures in this sequence, then we will have to accept these type of artifacts until burntool can be improved.
 
-We have also had concerns that some of the Magic false positives are caused by fractional errors in the variance.  We have found that the GPC1 data processed to the difference level has a higher pixel-to-pixel standard deviation in the background than expected from the noise propagation.  The effect is ranges from about The last four images illustrate the impact of the 
+We have also had concerns that some of the Magic false positives are caused by fractional errors in the variance.  We have found that the GPC1 data processed to the difference level has a higher pixel-to-pixel standard deviation in the background than expected from the noise propagation.  In the case of the exposure above, the effect ranges from about 15% to 25% (ie, stdev is 15% to 25% higher than expected).  We have shown that this effect does not appear in our simulated data analysis, which seems to suggest it is not caused by the software specifically.  The last four images illustrate the impact of an error in the variance level of this scale.  
+
+|| [[Image(http://kiawe.ifa.hawaii.edu/eugene/software/magic/72897.raw.clusters.png)]] 
+|| [[Image(http://kiawe.ifa.hawaii.edu/eugene/software/magic/72897.raw.streaks.png)]] 
+|| 
+|| [[Image(http://kiawe.ifa.hawaii.edu/eugene/software/magic/72897.sig29.clusters.png)]] 
+|| [[Image(http://kiawe.ifa.hawaii.edu/eugene/software/magic/72897.sig29.streaks.png)]] 
+|| 
 
 In conclusion, there are a number of camera ar