batgrbproduct Analysis for Trigger=205373
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.41
Process Start Time (local time): Mon Dec 31 18:31:52 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger205373/GCN5_download_cron
======================================================================
Trigger: 00205373 Segment: 000
BAT Trigger Time: 166765090.624 [s; MET]
Trigger Stop: 166765091.648 [s; MET]
UTC: 2006-04-15T03:38:09.490440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 140.112543289651 Dec: -55.2398355021994 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.59
Image Trigger?: NO
Rate S/N Ratio: 9.59166304662544 [ if not an image trigger ]
Image S/N Ratio: 6.59
Flight Position: [ source = BAT ]
RA: 140.112543289651 Dec: -55.2398355021994 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 140.086869892333 Dec: -55.2904491039416 [deg; J2000]
{ 09h 20m 20.8s , -55d 17' 25.6" }
+/- 2.7650759192011 [arcmin] (estimated 90% radius based on SNR)
+/- 1.16963002205113 [arcmin] (formal 1-sigma fit error)
SNR: 7.11390881689549
RA = 9h 20m 20.8s (140.086870 deg.)
Dec = -55d 17' 26" (-55.290449 deg.)
Angular difference between Flight and Ground position is 3.161106 arcmin
Partial Coding Fraction: 0.515625 [ including projection effects ]
Duration
T90: 3 +/- 2.23606797749979
Measured from: -0.624000012874603
to: 2.3759999871254 [s; relative to TRIGTIME]
T50: 1 +/- 1.4142135623731
Measured from: 0.375999987125397
to: 1.3759999871254 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.3759999871254
to: 2.3759999871254 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.624000012874603
to: 3.3759999871254 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.170155 0.023019 0.017011 -0.008522
0.014746 0.013300 0.011942 0.011195 [error]
Peak 0.055658 0.003012 0.009291 0.006530
0.007533 0.006655 0.005898 0.005557 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 5.36e-08 1.56e-08 2.45e-09 4.43e-10 7.19e-08 7.19e-08 erg/cm2
Error 9.62e-09 7.25e-09 3.05e-09 9.95e-10 1.57e-08 1.59e-08 erg/cm2
Peak flux Power-law 4.69e-01 1.24e-01 1.75e-02 2.78e-03 6.13e-01 6.14e-01 ph/cm2/s
Error 1.33e-01 6.87e-02 2.42e-02 7.71e-03 1.82e-01 1.83e-01 ph/cm2/s
Fluence Cutoff-PL 5.38e-08 1.52e-08 1.03e-11 2.88e-18 6.57e-08 7.09e-08 erg/cm2
Error 1.27e-08 2.83e-09 9.19e-11 1.79e-08 1.81e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.69e-01 1.24e-01 1.74e-02 2.75e-03 6.13e-01 6.13e-01 ph/cm2/s
Error 1.33e-01 6.87e-02 2.42e-02 7.64e-03 1.82e-01 1.83e-01 ph/cm2/s
Fluence Band 5.79e-08 8.84e-09 2.99e-10 1.05e-11 6.70e-08 7.88e-08 erg/cm2
Error 1.05e-08 7.26e-09 2.76e-09 7.15e-10 1.25e-08 1.69e-08 erg/cm2
Peak flux Band 4.31e-01 1.63e-01 1.01e-02 5.81e-04 6.49e-01 6.40e-01 ph/cm2/s
Error 1.23e-01 1.07e-02 3.54e-03 1.85e-01 1.82e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.664 0.820 - - 4.85e-04 4.98e-04 39.651 57
CPL 1.212 0.000 4.5 6.8 4.21e-01 0.00e+00 39.362 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.674 1.038 - - 1.33e-03 1.30e-03 59.932 57
CPL -2.468 0.000 14.4 8.9 2.36e+02 1.14e+03 56.202 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 4.000 -0.624 3.376
T90 3.000 -0.624 2.376
T50 1.000 0.376 1.376
Peak 1.000 1.376 2.376
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
140.0869 -55.2904 0.0269 31.9 145.8 0.2123 7.1 TRIG_00205373
------------------------------------------
Foreground time interval of the image:
-0.624 3.376 (delta_t = 4.000 [sec])
Background time interval of the image:
-10.624 -0.624 (delta_t = 10.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.624 sec. to 3.376 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.66382 ( -0.753139 0.886267 )
Norm@50keV : 4.848948E-04 ( -4.848948E-04 5.107044E-04) )
------------------------------------------------------------
Chi-Squared = 39.65147 using 59 PHA bins.
Reduced chi-squared = 0.6956398 for 57 degrees of freedom
Null hypothesis probability = 0.961
Photon flux (15-150 keV) in 4.000 sec: 0.544923 ( -0.1006 0.100767 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.18844e-08 ( -1.52096e-08 1.62368e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.624 sec. to 3.376 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21212 ( )
Epeak [keV] : 4.48428 ( -9.60533 3.95697 )
Norm@50keV : 0.421031 ( )
------------------------------------------------------------
Chi-Squared = 39.36174 using 59 PHA bins.
but latest trial 13.5723 gives Chi-Squared = 6.92894
Reduced chi-squared = 0.7028881 for 56 degrees of freedom
Null hypothesis probability = 0.955
Photon flux (15-150 keV) in 4.000 sec: 0.544483 ( -0.10055 0.100716 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.57408e-08 ( -1.24332e-08 2.33848e-08 ) ergs/cm2
Band function
Time interval is from -0.624 sec. to 3.376 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.77969 ( -7.35181 0.326806 )
beta : -9.37084 ( -0.886206 0.752862 )
Epeak [keV] : 11.3091 ( -11.2091 9988.69 )
Norm@50keV : 6.202867E-03 ( -2.35554 72.0356 )
------------------------------------------------------------
Chi-Squared = 70.51264 using 59 PHA bins.
Reduced chi-squared = 1.282048 for 55 degrees of freedom
Null hypothesis probability = 7.759E-02
Photon flux (15-150 keV) in 4.000 sec: 0.544494 ( -0.101192 0.100771 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.69944e-08 ( -1.25492e-08 1.24516e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.376 sec. to 2.376 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.67362 ( -0.756266 1.31949 )
Norm@50keV : 1.334356E-03 ( -1.334356E-03 1.260986E-03) )
------------------------------------------------------------
Chi-Squared = 59.93191 using 59 PHA bins.
Reduced chi-squared = 1.051437 for 57 degrees of freedom
Null hypothesis probability = 0.370
Photon flux (15-150 keV) in 1.000 sec: 0.613028 ( -0.181255 0.183144 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24711e-08 ( -7.9064e-09 9.4443e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.376 sec. to 2.376 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.46754 ( )
Epeak [keV] : 14.3667 ( -14.8300 2.90606 )
Norm@50keV : 235.683 ( -629.031 1653.45 )
------------------------------------------------------------
Chi-Squared = 56.20159 using 59 PHA bins.
Reduced chi-squared = 1.003600 for 56 degrees of freedom
Null hypothesis probability = 0.467
Photon flux (15-150 keV) in 1.000 sec: 0.612639 ( -0.181186 0.183077 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99242e-08 ( -5.6778e-09 5.9533e-09 ) ergs/cm2
Band function
Time interval is from 1.376 sec. to 2.376 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.56951 ( -0.515270 5.99708 )
beta : -8.99417 ( -4.577637E-05 6.88277 )
Epeak [keV] : 7.43122 ( -6.03081 2.57537 )
Norm@50keV : 2.878370E-02 ( -8486.59 11513.1 )
------------------------------------------------------------
Chi-Squared = 62.88531 using 59 PHA bins.
Reduced chi-squared = 1.143369 for 55 degrees of freedom
Null hypothesis probability = 0.217
Photon flux (15-150 keV) in 1.000 sec: 0.648608 ( -0.196076 0.173426 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13777e-08 ( -7.2985e-09 5.8371e-09 ) ergs/cm2
Plot creation:
Mon Dec 31 18:36:47 EST 2007