batgrbproduct Analysis for Trigger=313417
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 Jun 7 12:58:18 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger313417/GCN5_download_cron
======================================================================
Trigger: 00313417 Segment: 000
BAT Trigger Time: 234511649.856 [s; MET]
Trigger Stop: 234511650.88 [s; MET]
UTC: 2008-06-07T06:07:27.008340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 194.967287472106 Dec: 15.9004689525493 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 17.87
Image Trigger?: NO
Rate S/N Ratio: 238.88490952758 [ if not an image trigger ]
Image S/N Ratio: 17.87
Flight Position: [ source = BAT ]
RA: 194.967287472106 Dec: 15.9004689525493 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 194.963647094787 Dec: 15.9103862910476 [deg; J2000]
{ 12h 59m 51.3s , +15d 54' 37.4" }
+/- 0.892601097820795 [arcmin] (estimated 90% radius based on SNR)
+/- 0.277722519996961 [arcmin] (formal 1-sigma fit error)
SNR: 35.7773183000384
Angular difference between Flight and Ground position is 0.631030 arcmin
Partial Coding Fraction: 0.1113281 [ including projection effects ]
Duration
T90: 79.4280000030994 +/- 3.28506192878632
Measured from: -2.97600001096725
to: 76.4519999921322 [s; relative to TRIGTIME]
T50: 22.5200000107288 +/- 1.7563826490842
Measured from: 1.7039999961853
to: 24.2240000069141 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.50400000810623
to: 2.50400000810623 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.91200000047684
to: 183.699999988079 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 8.137451 11.903328 11.162140 3.729998
0.137487 0.159093 0.160776 0.124898 [error]
Peak 0.412212 0.900857 1.152068 0.443178
0.029165 0.039542 0.047851 0.036305 [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 2.67e-06 5.49e-06 8.82e-06 3.17e-05 2.44e-05 4.86e-05 erg/cm2
Error 1.21e-07 1.42e-07 1.81e-07 1.62e-06 4.64e-07 1.65e-06 erg/cm2
Peak flux Power-law 4.59e+00 6.70e+00 7.29e+00 1.49e+01 2.31e+01 3.34e+01 ph/cm2/s
Error 4.53e-01 4.02e-01 3.59e-01 1.60e+00 1.09e+00 1.79e+00 ph/cm2/s
Fluence Cutoff-PL 2.66e-06 5.50e-06 8.84e-06 3.09e-05 2.44e-05 4.58e-05 erg/cm2
Error 1.59e-07 1.41e-07 2.19e-07 3.47e-06 4.84e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.28e+00 6.79e+00 7.57e+00 1.18e+01 2.30e+01 3.05e+01 ph/cm2/s
Error 4.34e-01 4.27e-01 4.93e-01 3.45e+00 1.09e+00 3.36e+00 ph/cm2/s
Fluence Band 2.64e-06 5.47e-06 8.82e-06 3.11e-05 2.44e-05 4.58e-05 erg/cm2
Error 1.20e-07 1.42e-07 2.21e-07 3.65e-06 4.86e-07 0.00e+00 erg/cm2
Peak flux Band 4.28e+00 6.79e+00 7.57e+00 1.18e+01 2.30e+01 3.04e+01 ph/cm2/s
Error 5.83e-01 4.27e-01 4.96e-01 3.45e+00 1.10e+00 3.54e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.317 0.038 - - 1.31e-02 2.56e-04 33.960 57
CPL 1.312 0.038 9982.3 4848.1 1.32e-02 1.88e-04 33.931 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.877 0.081 - - 2.02e-01 9.53e-03 47.490 57
CPL 0.621 0.316 326.6 4911.6 2.60e-01 8.00e-02 45.633 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: 52.672000 sec.
T50 in the 50-300 keV band: 6.336000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 189.612 -5.912 183.700
T90 79.428 -2.976 76.452
T50 22.520 1.704 24.224
Peak 1.000 1.504 2.504
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
194.9636 +15.9104 0.0054 40.5 123.2 24.9615 35.8 TRIG_00313417
------------------------------------------
Foreground time interval of the image:
-5.912 11.145 (delta_t = 17.057 [sec])
Background time interval of the image:
-239.856 -5.912 (delta_t = 233.944 [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 -5.912 sec. to 183.700 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31652 ( -3.807127E-02 3.798485E-02) )
Norm@50keV : 1.309992E-02 ( -2.568522E-04 2.561333E-04) )
------------------------------------------------------------
Chi-Squared = 33.95990 using 59 PHA bins.
Reduced chi-squared = 0.5957878 for 57 degrees of freedom
Null hypothesis probability = 0.993
Photon flux (15-150 keV) in 189.6 sec: 1.56771 ( -0.03566 0.03583 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44463e-05 ( -4.63762e-07 4.64141e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.912 sec. to 183.700 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.31216 ( -3.835452E-02 3.826308E-02) )
Epeak [keV] : 9982.31 ( -9678.61 17.6943 )
Norm@50keV : 1.315282E-02 ( -2.486128E-04 1.282832E-04) )
------------------------------------------------------------
Chi-Squared = 33.93060 using 59 PHA bins.
but latest trial 1.290418E-02 gives Chi-Squared = 2.53511
but latest trial 1.340917E-02 gives Chi-Squared = 2.92144
Reduced chi-squared = 0.6059035 for 56 degrees of freedom
Null hypothesis probability = 0.991
Photon flux (15-150 keV) in 189.6 sec: 1.56668 ( -0.03563 0.0358 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44375e-05 ( -4.93529e-07 4.7381e-07 ) ergs/cm2
Band function
Time interval is from -5.912 sec. to 183.700 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01615 ( -0.178761 14.3365 )
beta : -1.31621 ( -3.798366E-02 3.807354E-02) )
Epeak [keV] : 46.7332 ( -46.6332 9953.27 )
Norm@50keV : 2.580578E-02 ( -3.487575E-02 3.480530E-02) )
------------------------------------------------------------
Chi-Squared = 33.97573 using 59 PHA bins.
Reduced chi-squared = 0.6177406 for 55 degrees of freedom
Null hypothesis probability = 0.988
Photon flux (15-150 keV) in 189.6 sec: 1.56762 ( -0.02945 0.01794 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4419e-05 ( -4.98079e-07 4.73621e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.504 sec. to 2.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.877457 ( -8.147299E-02 8.060765E-02) )
Norm@50keV : 0.201676 ( -9.553537E-03 9.509787E-03) )
------------------------------------------------------------
Chi-Squared = 47.49039 using 59 PHA bins.
Reduced chi-squared = 0.8331648 for 57 degrees of freedom
Null hypothesis probability = 0.811
Photon flux (15-150 keV) in 1.000 sec: 23.1461 ( -1.0919 1.0924 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28343e-06 ( -1.15306e-07 1.15518e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.504 sec. to 2.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.620566 ( -0.333376 0.298239 )
Epeak [keV] : 326.630 ( -149.834 9673.37 )
Norm@50keV : 0.259987 ( -6.259866E-02 9.743842E-02) )
------------------------------------------------------------
Chi-Squared = 45.63282 using 59 PHA bins.
Reduced chi-squared = 0.8148717 for 56 degrees of freedom
Null hypothesis probability = 0.837
Photon flux (15-150 keV) in 1.000 sec: 23.0409 ( -1.0828 1.0952 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27828e-06 ( -1.1774e-07 1.17254e-07 ) ergs/cm2
Band function
Time interval is from 1.504 sec. to 2.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.805518 ( -14.9992 8.049011E-04) )
beta : -0.877465 ( -8.084327E-02 8.170104E-02) )
Epeak [keV] : 18.0751 ( -17.9786 9981.91 )
Norm@50keV : 0.285428 ( -6257.63 2.025762E+07) )
------------------------------------------------------------
Chi-Squared = 47.49041 using 59 PHA bins.
Reduced chi-squared = 0.8634619 for 55 degrees of freedom
Null hypothesis probability = 0.754
Photon flux (15-150 keV) in 1.000 sec: 23.0413 ( -1.0985 1.0994 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27678e-06 ( -1.17599e-07 1.17374e-07 ) ergs/cm2
Plot creation:
Sat Jun 7 13:31:11 EDT 2008