batgrbproduct Analysis for Trigger=145754
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 Jan 7 15:03:14 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger145754/GCN5_download_cron
======================================================================
Trigger: 00145754 Segment: 000
BAT Trigger Time: 142949237.248 [s; MET]
Trigger Stop: 142949249.408 [s; MET]
UTC: 2005-07-13T12:07:17.628280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 307.843067664678 Dec: 60.9200340587601 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33472
Image Trigger?: NO
Rate S/N Ratio: 30.3973683071413 [ if not an image trigger ]
Image S/N Ratio: 33472
Flight Position: [ source = BAT ]
RA: 307.843067664678 Dec: 60.9200340587601 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: Dec: [deg; J2000]
{ 00h 00m 00.0s , +00d 00' 00.0" }
+/- inf [arcmin] (estimated 90% radius based on SNR)
+/- 0 [arcmin] (formal 1-sigma fit error)
SNR:
RA = 0h 0m 0.0s (0.000000 deg.)
Dec = 0d 0' 0" (0.000000 deg.)
Angular difference between Flight and Ground position is 4359.101745 arcmin
Partial Coding Fraction: 0.04296875 [ including projection effects ]
Duration
T90: 56.8959999978542 +/- 13.454011749326
Measured from: -0.0239999890327454
to: 56.8720000088215 [s; relative to TRIGTIME]
T50: 26.5600000321865 +/- 6.95247409432368
Measured from: 7.52799999713898
to: 34.0880000293255 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.91600000858307
to: 9.91600000858307 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.82400000095367
to: 62.9519999921322 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.282287 1.916595 1.886532 0.374125
0.179743 0.191025 0.170504 0.143680 [error]
Peak 0.077413 0.093426 0.077164 0.027735
0.020929 0.026515 0.025813 0.019583 [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 4.76e-07 9.34e-07 1.42e-06 4.72e-06 3.99e-06 7.55e-06 erg/cm2
Error 8.99e-08 1.06e-07 1.63e-07 1.20e-06 4.11e-07 1.30e-06 erg/cm2
Peak flux Power-law 7.27e-01 7.02e-01 4.73e-01 4.98e-01 2.10e+00 2.40e+00 ph/cm2/s
Error 3.96e-01 2.39e-01 2.07e-01 4.53e-01 6.85e-01 7.81e-01 ph/cm2/s
Fluence Cutoff-PL 4.21e-07 9.71e-07 1.51e-06 2.58e-06 3.92e-06 5.45e-06 erg/cm2
Error 1.15e-07 1.22e-07 2.53e-07 2.15e-06 4.30e-07 2.17e-06 erg/cm2
Peak flux Cutoff-PL 7.26e-01 7.02e-01 4.73e-01 4.94e-01 2.10e+00 2.40e+00 ph/cm2/s
Error 3.96e-01 2.39e-01 2.07e-01 4.50e-01 6.85e-01 7.80e-01 ph/cm2/s
Fluence Band 4.17e-07 9.68e-07 1.50e-06 2.58e-06 3.92e-06 5.47e-06 erg/cm2
Error 1.14e-07 1.22e-07 2.04e-07 2.15e-06 4.30e-07 2.17e-06 erg/cm2
Peak flux Band 7.10e-01 6.98e-01 4.77e-01 5.10e-01 2.10e+00 2.43e+00 ph/cm2/s
Error 2.18e-01 2.39e-01 1.66e-01 3.49e-01 6.72e-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 1.393 0.171 - - 6.08e-03 5.95e-04 53.644 57
CPL 0.874 0.740 122.3 4963.4 1.05e-02 9.12e-03 52.133 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.571 0.625 - - 1.65e-02 5.68e-03 50.028 57
CPL 1.569 0.629 9994.1 5000.0 1.66e-02 5.72e-03 50.030 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: 19.392000 sec.
T50 in the 50-300 keV band: 12.224000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 67.776 -4.824 62.952
T90 56.896 -0.024 56.872
T50 26.560 7.528 34.088
Peak 1.000 8.916 9.916
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
------------------------------------------
--> command terminated with status 0
Foreground time interval of the image:
-4.824 59.653 (delta_t = 64.477 [sec])
Background time interval of the image:
-60.248 -4.824 (delta_t = 55.424 [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 -4.824 sec. to 62.952 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39339 ( -0.171553 0.170186 )
Norm@50keV : 6.079109E-03 ( -5.952171E-04 5.951449E-04) )
------------------------------------------------------------
Chi-Squared = 53.64409 using 59 PHA bins.
Reduced chi-squared = 0.9411244 for 57 degrees of freedom
Null hypothesis probability = 0.602
Photon flux (15-150 keV) in 67.78 sec: 0.739219 ( -0.078245 0.078642 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.98705e-06 ( -4.10333e-07 4.11018e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.824 sec. to 62.952 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.874390 ( -0.849129 0.629958 )
Epeak [keV] : 122.289 ( -49.1957 9877.71 )
Norm@50keV : 1.048712E-02 ( -4.012773E-03 1.423089E-02) )
------------------------------------------------------------
Chi-Squared = 52.13293 using 59 PHA bins.
but latest trial 47.8685 gives Chi-Squared = 31.0662
but latest trial 4.488048E-03 gives Chi-Squared = 21.2446
Reduced chi-squared = 0.9309452 for 56 degrees of freedom
Null hypothesis probability = 0.622
Photon flux (15-150 keV) in 67.78 sec: 0.721836 ( -0.082078 0.082168 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.91745e-06 ( -4.31908e-07 4.27109e-07 ) ergs/cm2
Band function
Time interval is from -4.824 sec. to 62.952 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.872718 ( -0.631629 0.848169 )
beta : -7.89915 ( -2.10085 7.53794 )
Epeak [keV] : 122.032 ( -44.3841 9877.97 )
Norm@50keV : 1.050581E-02 ( -5.058262E-03 1.421477E-02) )
------------------------------------------------------------
Chi-Squared = 52.13294 using 59 PHA bins.
Reduced chi-squared = 0.9478717 for 55 degrees of freedom
Null hypothesis probability = 0.585
Photon flux (15-150 keV) in 67.78 sec: 0.721871 ( -0.082116 0.082188 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.91503e-06 ( -4.31853e-07 4.2717e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 8.936 sec. to 9.896 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57052 ( -0.588648 0.661577 )
Norm@50keV : 1.651203E-02 ( -5.874006E-03 5.494695E-03) )
------------------------------------------------------------
Chi-Squared = 50.02800 using 59 PHA bins.
Reduced chi-squared = 0.8776843 for 57 degrees of freedom
Null hypothesis probability = 0.732
Photon flux (15-150 keV) in 0.9600 sec: 2.10295 ( -0.68471 0.68509 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48409e-07 ( -5.42064e-08 5.54986e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.936 sec. to 9.896 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56872 ( -0.592645 0.664854 )
Epeak [keV] : 9994.06 ( -9994.05 5.93750 )
Norm@50keV : 1.655427E-02 ( -5.919483E-03 5.524937E-03) )
------------------------------------------------------------
Chi-Squared = 50.03033 using 59 PHA bins.
Reduced chi-squared = 0.8933988 for 56 degrees of freedom
Null hypothesis probability = 0.699
Photon flux (15-150 keV) in 0.9600 sec: 2.10232 ( -0.68451 0.68492 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48806e-07 ( -5.46034e-08 5.5177e-08 ) ergs/cm2
Band function
Time interval is from 8.936 sec. to 9.896 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25153 ( -8.74847 6.25153 )
beta : -1.57022 ( -8.42978 0.588132 )
Epeak [keV] : 28.8300 ( -28.7300 9971.17 )
Norm@50keV : 3.553194E-02 ( -3.553193E-02 11.2807 )
------------------------------------------------------------
Chi-Squared = 50.02800 using 59 PHA bins.
Reduced chi-squared = 0.9096001 for 55 degrees of freedom
Null hypothesis probability = 0.665
Photon flux (15-150 keV) in 0.9600 sec: 2.09906 ( -0.67036 0.67449 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4949e-07 ( -5.34893e-08 2.57173e-05 ) ergs/cm2
Plot creation:
Mon Jan 7 15:28:42 EST 2008