batgrbproduct Analysis for Trigger=152325
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): Tue Jan 8 18:30:55 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger152325/GCN5_download_cron
======================================================================
Trigger: 00152325 Segment: 000
BAT Trigger Time: 146861834.816 [s; MET]
Trigger Stop: 146861835.84 [s; MET]
UTC: 2005-08-27T18:57:15.118740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 64.2790125123005 Dec: 18.2176224509772 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.71
Image Trigger?: NO
Rate S/N Ratio: 24.8596057893121 [ if not an image trigger ]
Image S/N Ratio: 8.71
Flight Position: [ source = BAT ]
RA: 64.2790125123005 Dec: 18.2176224509772 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 64.2933170161854 Dec: 18.2167650859013 [deg; J2000]
{ 04h 17m 10.4s , +18d 13' 00.4" }
+/- 1.09066399331869 [arcmin] (estimated 90% radius based on SNR)
+/- 0.363383086184168 [arcmin] (formal 1-sigma fit error)
SNR: 26.8703998376736
RA = 4h 17m 10.4s (64.293317 deg.)
Dec = 18d 13' 0" (18.216765 deg.)
Angular difference between Flight and Ground position is 0.816874 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 48.1000000238419 +/- 9.19313069704841
Measured from: -22.7880000174046
to: 25.3120000064373 [s; relative to TRIGTIME]
T50: 10.6960000097752 +/- 1.71170559281001
Measured from: -6.81600001454353
to: 3.87999999523163 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.303999990224838
to: 1.30399999022484 [s; relative to TRIGTIME]
Total Fluence
Measured from: -31.1840000152588
to: 36.1239999830723 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.772806 1.143140 0.922935 0.283081
0.055809 0.057130 0.048501 0.038954 [error]
Peak 0.040086 0.088001 0.078220 0.027575
0.007311 0.008170 0.007502 0.005713 [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 2.46e-07 4.89e-07 7.52e-07 2.53e-06 2.10e-06 4.03e-06 erg/cm2
Error 2.72e-08 3.13e-08 4.86e-08 3.77e-07 1.21e-07 4.01e-07 erg/cm2
Peak flux Power-law 4.51e-01 5.72e-01 5.30e-01 8.59e-01 1.84e+00 2.41e+00 ph/cm2/s
Error 9.43e-02 7.36e-02 5.87e-02 2.03e-01 1.99e-01 2.58e-01 ph/cm2/s
Fluence Cutoff-PL 2.44e-07 4.91e-07 7.56e-07 2.34e-06 2.10e-06 3.71e-06 erg/cm2
Error 2.86e-08 3.33e-08 4.78e-08 7.08e-07 1.21e-07 7.28e-07 erg/cm2
Peak flux Cutoff-PL 4.09e-01 5.89e-01 5.58e-01 5.85e-01 1.82e+00 2.14e+00 ph/cm2/s
Error 1.15e-01 8.16e-02 7.60e-02 4.08e-01 2.01e-01 3.89e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.06e-01 5.93e-01 5.55e-01 7.90e-01 1.82e+00 2.24e+00 ph/cm2/s
Error 1.18e-01 9.96e-02 8.38e-02 1.75e-01 2.08e-01 3.68e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.379 0.101 - - 3.22e-03 1.74e-04 40.191 57
CPL 1.303 0.254 503.4 0.0 3.49e-03 1.75e-04 40.278 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.112 0.176 - - 1.59e-02 1.64e-03 52.609 57
CPL 0.711 0.658 182.9 5000.0 2.42e-02 1.92e-02 51.563 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: 15.040000 sec.
T50 in the 50-300 keV band: 6.400000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 67.308 -31.184 36.124
T90 48.100 -22.788 25.312
T50 10.696 -6.816 3.880
Peak 1.000 0.304 1.304
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
64.2933 +18.2168 0.0073 31.1 145.4 3.1583 26.9 TRIG_00152325
------------------------------------------
Foreground time interval of the image:
-31.184 36.124 (delta_t = 67.308 [sec])
Background time interval of the image:
-299.816 -31.184 (delta_t = 268.632 [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 -31.184 sec. to 36.124 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37918 ( -0.101084 0.100406 )
Norm@50keV : 3.218868E-03 ( -1.742174E-04 1.741960E-04) )
------------------------------------------------------------
Chi-Squared = 40.19055 using 59 PHA bins.
Reduced chi-squared = 0.7050974 for 57 degrees of freedom
Null hypothesis probability = 0.955
Photon flux (15-150 keV) in 67.31 sec: 0.390186 ( -0.023031 0.023148 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10272e-06 ( -1.20586e-07 1.21037e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -31.184 sec. to 36.124 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30302 ( -0.332477 0.175360 )
Epeak [keV] : 503.401 ( )
Norm@50keV : 3.492365E-03 ( -1.698066E-04 1.799420E-04) )
------------------------------------------------------------
Chi-Squared = 40.27822 using 59 PHA bins.
Reduced chi-squared = 0.7192540 for 56 degrees of freedom
Null hypothesis probability = 0.944
Photon flux (15-150 keV) in 67.31 sec: 0.390034 ( -0.023022 0.023138 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10252e-06 ( -1.2027e-07 1.21468e-07 ) ergs/cm2
Band function
Time interval is from -31.184 sec. to 36.124 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.926841 ( -9.07316 3.13285 )
beta : -1.41224 ( -8.58776 0.130944 )
Epeak [keV] : 81.2223 ( -81.1223 9918.78 )
Norm@50keV : 6.147079E-03 ( -6.147079E-03 255.252 )
------------------------------------------------------------
Chi-Squared = 40.02275 using 59 PHA bins.
Reduced chi-squared = 0.7276865 for 55 degrees of freedom
Null hypothesis probability = 0.935
Photon flux (15-150 keV) in 67.31 sec: 0.387558 ( -0.02502 0.024434 ) 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 0.304 sec. to 1.304 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11168 ( -0.178617 0.173455 )
Norm@50keV : 1.588032E-02 ( -1.644689E-03 1.640012E-03) )
------------------------------------------------------------
Chi-Squared = 52.60935 using 59 PHA bins.
Reduced chi-squared = 0.9229710 for 57 degrees of freedom
Null hypothesis probability = 0.640
Photon flux (15-150 keV) in 1.000 sec: 1.84413 ( -0.19831 0.19889 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6538e-07 ( -1.796e-08 1.8112e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.304 sec. to 1.304 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.710789 ( -0.780359 0.536234 )
Epeak [keV] : 182.858 ( -182.848 9817.14 )
Norm@50keV : 2.421621E-02 ( -9.548236E-03 2.879240E-02) )
------------------------------------------------------------
Chi-Squared = 51.56345 using 59 PHA bins.
but latest trial 1.24224 gives Chi-Squared = 6.51846
Reduced chi-squared = 0.9207759 for 56 degrees of freedom
Null hypothesis probability = 0.643
Photon flux (15-150 keV) in 1.000 sec: 1.82391 ( -0.20147 0.20135 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63398e-07 ( -1.891e-08 1.8635e-08 ) ergs/cm2
Band function
Time interval is from 0.304 sec. to 1.304 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.125819 ( -10.1258 4.86474 )
beta : -1.23703 ( -8.76297 0.246447 )
Epeak [keV] : 62.4079 ( -62.3079 1120.82 )
Norm@50keV : 8.941689E-02 ( -129.903 21.3068 )
------------------------------------------------------------
Chi-Squared = 50.96119 using 59 PHA bins.
Reduced chi-squared = 0.9265671 for 55 degrees of freedom
Null hypothesis probability = 0.630
Photon flux (15-150 keV) in 1.000 sec: 1.82069 ( -0.21076 0.20552 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63291e-07 ( -1.8895e-08 1.8628e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 18:41:53 EST 2008