batgrbproduct Analysis for Trigger=118707
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): Sat Jan 5 02:13:59 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger118707/SDC2
======================================================================
Trigger: 00118707 Segment: 000
BAT Trigger Time: 137295988.032 [s; MET]
Trigger Stop: 137295989.056 [s; MET]
UTC: 2005-05-09T01:46:28.517900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 310.588276969851 Dec: 54.0700958528791 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9
Image Trigger?: NO
Rate S/N Ratio: 19.94993734326 [ if not an image trigger ]
Image S/N Ratio: 9
Flight Position: [ source = BAT ]
RA: 310.588276969851 Dec: 54.0700958528791 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 310.572149311135 Dec: 54.0811014453044 [deg; J2000]
{ 20h 42m 17.3s , +54d 04' 52.0" }
+/- 1.28777665939858 [arcmin] (estimated 90% radius based on SNR)
+/- 0.534726241947179 [arcmin] (formal 1-sigma fit error)
SNR: 21.1935305140977
RA = 20h 42m 17.3s (310.572149 deg.)
Dec = 54d 4' 52" (54.081101 deg.)
Angular difference between Flight and Ground position is 0.870847 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 11.4079999923706 +/- 2.32640494635445
Measured from: -5.59999999403954
to: 5.80799999833107 [s; relative to TRIGTIME]
T50: 4.1240000128746 +/- 0.859769738517603
Measured from: -2.79199999570847
to: 1.33200001716614 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.703999996185303
to: 1.7039999961853 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.26800000667572
to: 8.0639999806881 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.291729 0.252452 0.121047 0.033816
0.018046 0.018234 0.015701 0.013197 [error]
Peak 0.046938 0.039016 0.022996 0.005180
0.005134 0.005046 0.004377 0.003456 [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 8.30e-08 1.06e-07 9.80e-08 1.60e-07 3.41e-07 4.45e-07 erg/cm2
Error 1.04e-08 8.69e-09 1.53e-08 5.05e-08 3.36e-08 6.60e-08 erg/cm2
Peak flux Power-law 4.26e-01 2.94e-01 1.34e-01 8.44e-02 8.95e-01 9.38e-01 ph/cm2/s
Error 7.84e-02 4.08e-02 3.41e-02 4.02e-02 1.21e-01 1.29e-01 ph/cm2/s
Fluence Cutoff-PL 8.29e-08 1.06e-07 9.81e-08 1.59e-07 3.41e-07 4.49e-07 erg/cm2
Error 1.04e-08 8.70e-09 1.53e-08 5.01e-08 3.36e-08 8.93e-08 erg/cm2
Peak flux Cutoff-PL 4.17e-01 3.07e-01 1.31e-01 5.03e-02 8.86e-01 9.05e-01 ph/cm2/s
Error 8.33e-02 5.27e-02 3.84e-02 6.32e-02 1.20e-01 1.44e-01 ph/cm2/s
Fluence Band 4.56e-07 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 3.24e-08 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.17e-01 3.07e-01 1.31e-01 5.02e-02 8.86e-01 9.05e-01 ph/cm2/s
Error 8.33e-02 5.26e-02 3.86e-02 4.81e-02 1.23e-01 1.44e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.106 0.177 - - 2.56e-03 2.80e-04 59.136 57
CPL 1.996 0.243 1.9 0.0 2.90e-03 1.79e-03 59.441 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.140 0.272 - - 5.58e-03 1.07e-03 67.019 57
CPL 1.811 0.728 22.5 5000.0 8.82e-03 2.22e-02 66.662 0
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: 7.488000 sec.
T50 in the 50-300 keV band: 4.352000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 14.332 -6.268 8.064
T90 11.408 -5.600 5.808
T50 4.124 -2.792 1.332
Peak 1.000 0.704 1.704
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
310.5721 +54.0811 0.0091 8.2 85.9 0.6755 21.2 TRIG_00118707
------------------------------------------
Foreground time interval of the image:
-6.268 8.064 (delta_t = 14.332 [sec])
Background time interval of the image:
-299.032 -6.268 (delta_t = 292.764 [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 -6.268 sec. to 8.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.10615 ( -0.172794 0.181009 )
Norm@50keV : 2.557867E-03 ( -2.833421E-04 2.762459E-04) )
------------------------------------------------------------
Chi-Squared = 59.13585 using 59 PHA bins.
Reduced chi-squared = 1.037471 for 57 degrees of freedom
Null hypothesis probability = 0.397
Photon flux (15-150 keV) in 14.33 sec: 0.403644 ( -0.033409 0.033461 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.40772e-07 ( -3.32198e-08 3.38819e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.268 sec. to 8.064 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99594 ( -0.473274 1.183891E-02) )
Epeak [keV] : 1.91808 ( )
Norm@50keV : 2.899889E-03 ( -9.216128E-04 2.668000E-03) )
------------------------------------------------------------
Chi-Squared = 59.44108 using 59 PHA bins.
but latest trial 2.00407 gives Chi-Squared = 0.625828
Reduced chi-squared = 1.061448 for 56 degrees of freedom
Null hypothesis probability = 0.351
Photon flux (15-150 keV) in 14.33 sec: 0.403471 ( -0.033394 0.033447 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.40714e-07 ( -3.32126e-08 3.38962e-08 ) ergs/cm2
Band function
Time interval is from -6.268 sec. to 8.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62700 ( -8.926392E-04 14.9991 )
beta : -2.09088 ( -0.181501 0.172800 )
Epeak [keV] : 5.02294 ( -4.92294 9994.98 )
Norm@50keV : 1.074476E-02 ( -3.853270E-02 3.754762E-02) )
------------------------------------------------------------
Chi-Squared = 59.15624 using 59 PHA bins.
Reduced chi-squared = 1.075568 for 55 degrees of freedom
Null hypothesis probability = 0.326
Photon flux (15-150 keV) in 14.33 sec: 0.403778 ( -0.033057 0.032919 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.704 sec. to 1.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13960 ( -0.260024 0.283594 )
Norm@50keV : 5.576324E-03 ( -1.087136E-03 1.055318E-03) )
------------------------------------------------------------
Chi-Squared = 67.01947 using 59 PHA bins.
Reduced chi-squared = 1.175780 for 57 degrees of freedom
Null hypothesis probability = 0.171
Photon flux (15-150 keV) in 1.000 sec: 0.894844 ( -0.120882 0.120886 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.19829e-08 ( -8.7181e-09 9.1142e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.704 sec. to 1.704 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81140 ( -1.13618 0.319039 )
Epeak [keV] : 22.5018 ( -22.4918 9977.50 )
Norm@50keV : 8.822784E-03 ( -8.822784E-03 3.556657E-02) )
------------------------------------------------------------
Chi-Squared = 66.66219 using 59 PHA bins.
but latest trial 2.02775 gives Chi-Squared = 0.840851
Reduced chi-squared = 1.190396 for 56 degrees of freedom
Null hypothesis probability = 0.156
Photon flux (15-150 keV) in 1.000 sec: 0.886439 ( -0.119602 0.119601 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.02097e-08 ( -9.8913e-09 1.01386e-08 ) ergs/cm2
Band function
Time interval is from 0.704 sec. to 1.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.81741 ( -11.6406 3.35936 )
beta : -3.51800 ( -0.495142 12.2640 )
Epeak [keV] : 22.0657 ( -22.4725 616.290 )
Norm@50keV : 8.760582E-03 ( -1355.29 580.645 )
------------------------------------------------------------
Chi-Squared = 66.66224 using 59 PHA bins.
Reduced chi-squared = 1.212041 for 55 degrees of freedom
Null hypothesis probability = 0.135
Photon flux (15-150 keV) in 1.000 sec: 0.886372 ( -0.122958 0.123008 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.007e-08 ( -8.37e-09 8.3014e-09 ) ergs/cm2
Plot creation:
Sat Jan 5 02:24:34 EST 2008