batgrbproduct Analysis for Trigger=106107
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): Fri Jan 4 20:51:30 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger106107/GCN_download_cron
======================================================================
Trigger: 00106107 Segment: 000
BAT Trigger Time: 130127622.592 [s; MET]
Trigger Stop: 130127624.64 [s; MET]
UTC: 2005-02-15T02:33:43.199080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 174.439240209498 Dec: 40.7963490256769 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8
Image Trigger?: NO
Rate S/N Ratio: 13.2664991614216 [ if not an image trigger ]
Image S/N Ratio: 8
Flight Position: [ source = BAT ]
RA: 174.439240209498 Dec: 40.7963490256769 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 174.47956240827 Dec: 40.7921364983032 [deg; J2000]
{ 11h 37m 55.1s , +40d 47' 31.7" }
+/- 1.81869681181744 [arcmin] (estimated 90% radius based on SNR)
+/- 0.825973004752916 [arcmin] (formal 1-sigma fit error)
SNR: 12.9429188820582
RA = 11h 37m 55.1s (174.479562 deg.)
Dec = 40d 47' 32" (40.792136 deg.)
Angular difference between Flight and Ground position is 1.848938 arcmin
Partial Coding Fraction: 0.828125 [ including projection effects ]
Duration
T90: 10.4640000015497 +/- 4.42436888401704
Measured from: -1.34399999678135
to: 9.12000000476837 [s; relative to TRIGTIME]
T50: 4.75200000405312 +/- 1.68547678779036
Measured from: 0
to: 4.75200000405312 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.132000014185905
to: 1.13200001418591 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.79199999570847
to: 13.472000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.218749 0.171772 0.080700 -0.000881
0.018836 0.019472 0.016773 0.014375 [error]
Peak 0.027287 0.034079 0.015240 0.003865
0.005102 0.005308 0.004499 0.003732 [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 6.30e-08 7.42e-08 6.30e-08 9.07e-08 2.32e-07 2.93e-07 erg/cm2
Error 9.93e-09 9.41e-09 1.54e-08 4.26e-08 3.50e-08 6.20e-08 erg/cm2
Peak flux Power-law 2.73e-01 2.27e-01 1.28e-01 1.08e-01 6.75e-01 7.36e-01 ph/cm2/s
Error 7.20e-02 4.19e-02 3.61e-02 5.76e-02 1.25e-01 1.39e-01 ph/cm2/s
Fluence Cutoff-PL 6.19e-08 7.78e-08 5.99e-08 4.10e-08 2.22e-07 2.41e-07 erg/cm2
Error 1.04e-08 1.25e-08 1.46e-08 5.79e-08 4.08e-08 8.27e-08 erg/cm2
Peak flux Cutoff-PL 2.38e-01 2.72e-01 1.23e-01 1.78e-02 6.48e-01 6.51e-01 ph/cm2/s
Error 8.54e-02 6.46e-02 4.74e-02 6.01e-02 1.28e-01 1.34e-01 ph/cm2/s
Fluence Band 6.23e-08 7.68e-08 5.82e-08 7.17e-08 2.25e-07 2.72e-07 erg/cm2
Error 1.10e-08 1.12e-08 1.70e-08 3.68e-08 5.80e-08 0.00e+00 erg/cm2
Peak flux Band 2.37e-01 2.73e-01 1.21e-01 3.69e-02 6.53e-01 6.67e-01 ph/cm2/s
Error 8.52e-02 6.03e-02 3.75e-02 5.73e-02 1.24e-01 1.40e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.236 0.248 - - 1.61e-03 2.86e-04 66.391 57
CPL 1.619 0.000 23.5 0.0 3.84e-03 7.69e-03 65.991 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.821 0.321 - - 4.86e-03 1.06e-03 60.474 57
CPL 0.241 2.016 45.6 4983.2 4.07e-02 4.90e-01 57.892 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 15.264 -1.792 13.472
T90 10.464 -1.344 9.120
T50 4.752 0.000 4.752
Peak 1.000 0.132 1.132
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
174.4796 +40.7921 0.0148 23.9 21.2 0.4791 12.9 TRIG_00106107
------------------------------------------
Foreground time interval of the image:
-1.792 13.472 (delta_t = 15.264 [sec])
Background time interval of the image:
-60.592 -1.792 (delta_t = 58.800 [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 -1.792 sec. to 13.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.23639 ( -0.238335 0.258447 )
Norm@50keV : 1.611326E-03 ( -2.887896E-04 2.823333E-04) )
------------------------------------------------------------
Chi-Squared = 66.39087 using 59 PHA bins.
Reduced chi-squared = 1.164752 for 57 degrees of freedom
Null hypothesis probability = 0.185
Photon flux (15-150 keV) in 15.26 sec: 0.271970 ( -0.032351 0.032352 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32446e-07 ( -3.44571e-08 3.56352e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.792 sec. to 13.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61879 ( )
Epeak [keV] : 23.4771 ( )
Norm@50keV : 3.841025E-03 ( -3.093274E-03 1.229400E-02) )
------------------------------------------------------------
Chi-Squared = 65.99072 using 59 PHA bins.
Reduced chi-squared = 1.178406 for 56 degrees of freedom
Null hypothesis probability = 0.170
Photon flux (15-150 keV) in 15.26 sec: 0.268574 ( -0.033179 0.033193 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22151e-07 ( -3.99705e-08 4.16796e-08 ) ergs/cm2
Band function
Time interval is from -1.792 sec. to 13.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.99067 ( -8.10525 6.89475 )
beta : -4.57166 ( -7.69437 0.293198 )
Epeak [keV] : 7.18022 ( -7.08222 33.9284 )
Norm@50keV : 1.893870E-03 ( -1.00919 476.801 )
------------------------------------------------------------
Chi-Squared = 67.98615 using 59 PHA bins.
Reduced chi-squared = 1.236112 for 55 degrees of freedom
Null hypothesis probability = 0.112
Photon flux (15-150 keV) in 15.26 sec: 0.268573 ( -0.033187 0.033214 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24812e-07 ( -3.58579e-08 3.78311e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.128 sec. to 1.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82138 ( -0.309359 0.332286 )
Norm@50keV : 4.860217E-03 ( -1.074080E-03 1.041958E-03) )
------------------------------------------------------------
Chi-Squared = 60.47380 using 59 PHA bins.
Reduced chi-squared = 1.060944 for 57 degrees of freedom
Null hypothesis probability = 0.352
Photon flux (15-150 keV) in 1.008 sec: 0.675365 ( -0.124765 0.124792 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50993e-08 ( -9.84695e-09 1.00908e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.128 sec. to 1.136 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.241169 ( -2.39113 1.64014 )
Epeak [keV] : 45.6449 ( -12.1010 9954.36 )
Norm@50keV : 4.067925E-02 ( -3.604510E-02 0.944523 )
------------------------------------------------------------
Chi-Squared = 57.89202 using 59 PHA bins.
but latest trial 1.88143 gives Chi-Squared = 2.67499
Reduced chi-squared = 1.033786 for 56 degrees of freedom
Null hypothesis probability = 0.405
Photon flux (15-150 keV) in 1.008 sec: 0.648406 ( -0.127622 0.128284 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.91991e-08 ( -9.47248e-09 1.15941e-08 ) ergs/cm2
Band function
Time interval is from 0.128 sec. to 1.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.253144 ( -2.16526 3.08107 )
beta : -3.02341 ( -6.97659 1.29714 )
Epeak [keV] : 45.0234 ( -21.3733 205.038 )
Norm@50keV : 4.067993E-02 ( -3.653051E-02 185.714 )
------------------------------------------------------------
Chi-Squared = 57.61879 using 59 PHA bins.
Reduced chi-squared = 1.047614 for 55 degrees of freedom
Null hypothesis probability = 0.379
Photon flux (15-150 keV) in 1.008 sec: 0.653428 ( -0.125261 0.122463 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.03229e-08 ( -7.43924e-09 5.43262e-09 ) ergs/cm2
Plot creation:
Fri Jan 4 20:58:18 EST 2008