batgrbproduct Analysis for Trigger=232339
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): Wed Jan 2 07:51:45 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger232339/GCN5_download_cron
======================================================================
Trigger: 00232339 Segment: 000
BAT Trigger Time: 181684232 [s; MET]
Trigger Stop: 181684233.024 [s; MET]
UTC: 2006-10-04T19:50:30.514260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 97.7482318589518 Dec: -45.8937054140806 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.2
Image Trigger?: NO
Rate S/N Ratio: 13.1909059582729 [ if not an image trigger ]
Image S/N Ratio: 8.2
Flight Position: [ source = BAT ]
RA: 97.7482318589518 Dec: -45.8937054140806 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 97.7906990205881 Dec: -45.9042250761667 [deg; J2000]
{ 06h 31m 09.8s , -45d 54' 15.2" }
+/- 0.858272704574558 [arcmin] (estimated 90% radius based on SNR)
+/- 0.25877342462978 [arcmin] (formal 1-sigma fit error)
SNR: 37.8389763119848
RA = 6h 31m 9.8s (97.790699 deg.)
Dec = -45d 54' 15" (-45.904225 deg.)
Angular difference between Flight and Ground position is 1.882224 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 6.27599999308586 +/- 0.65293185316178
Measured from: 0.84400001168251
to: 7.12000000476837 [s; relative to TRIGTIME]
T50: 1.91600000858307 +/- 0.272117613222992
Measured from: 2.64399999380112
to: 4.56000000238419 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.67199999094009
to: 3.67199999094009 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.243999987840652
to: 8.11599999666214 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.326639 0.410776 0.208064 0.046371
0.014635 0.015197 0.013086 0.010737 [error]
Peak 0.090589 0.120636 0.074265 0.023907
0.005846 0.006264 0.005457 0.004041 [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 1.06e-07 1.60e-07 1.82e-07 3.95e-07 5.66e-07 8.45e-07 erg/cm2
Error 8.92e-09 7.99e-09 1.32e-08 6.18e-08 3.04e-08 7.21e-08 erg/cm2
Peak flux Power-law 9.10e-01 8.50e-01 5.51e-01 5.51e-01 2.54e+00 2.86e+00 ph/cm2/s
Error 9.67e-02 5.51e-02 4.58e-02 9.38e-02 1.60e-01 1.77e-01 ph/cm2/s
Fluence Cutoff-PL 1.02e-07 1.64e-07 1.83e-07 2.78e-07 5.55e-07 7.09e-07 erg/cm2
Error 1.07e-08 9.86e-09 1.38e-08 1.57e-07 3.58e-08 1.53e-07 erg/cm2
Peak flux Cutoff-PL 8.76e-01 8.72e-01 5.60e-01 4.06e-01 2.51e+00 2.71e+00 ph/cm2/s
Error 1.14e-01 6.75e-02 4.98e-02 1.99e-01 1.67e-01 2.72e-01 ph/cm2/s
Fluence Band 9.63e-08 1.68e-07 1.78e-07 3.27e-07 5.49e-07 7.85e-07 erg/cm2
Error 1.18e-08 1.11e-08 1.42e-08 7.64e-08 3.41e-08 7.54e-08 erg/cm2
Peak flux Band 8.42e-01 8.99e-01 5.46e-01 4.72e-01 2.49e+00 2.76e+00 ph/cm2/s
Error 1.25e-01 7.90e-02 5.37e-02 1.52e-01 1.72e-01 2.29e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.814 0.095 - - 7.81e-03 4.11e-04 36.530 57
CPL 1.602 0.353 89.3 4974.0 1.01e-02 4.31e-03 35.638 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.626 0.112 - - 1.96e-02 1.27e-03 72.163 57
CPL 1.383 0.420 122.2 4965.7 2.63e-02 1.47e-02 71.346 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: 3.328000 sec.
T50 in the 50-300 keV band: 1.088000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.872 0.244 8.116
T90 6.276 0.844 7.120
T50 1.916 2.644 4.560
Peak 1.000 2.672 3.672
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
97.7907 -45.9042 0.0051 16.6 173.8 1.0316 37.8 TRIG_00232339
------------------------------------------
Foreground time interval of the image:
0.244 8.116 (delta_t = 7.872 [sec])
Background time interval of the image:
-239.000 0.244 (delta_t = 239.244 [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 0.244 sec. to 8.116 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81374 ( -9.465039E-02 9.586227E-02) )
Norm@50keV : 7.809956E-03 ( -4.128641E-04 4.096609E-04) )
------------------------------------------------------------
Chi-Squared = 36.53020 using 59 PHA bins.
Reduced chi-squared = 0.6408808 for 57 degrees of freedom
Null hypothesis probability = 0.984
Photon flux (15-150 keV) in 7.872 sec: 1.08198 ( -0.05548 0.05564 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.65724e-07 ( -3.03214e-08 3.05355e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.244 sec. to 8.116 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.60249 ( -0.416260 0.289077 )
Epeak [keV] : 89.3267 ( -37.2814 9910.67 )
Norm@50keV : 1.006835E-02 ( -2.198681E-03 6.423136E-03) )
------------------------------------------------------------
Chi-Squared = 35.63751 using 59 PHA bins.
but latest trial 26.5513 gives Chi-Squared = 4.26580
but latest trial 6.954823E-03 gives Chi-Squared = 12.5169
Reduced chi-squared = 0.6363841 for 56 degrees of freedom
Null hypothesis probability = 0.985
Photon flux (15-150 keV) in 7.872 sec: 1.06807 ( -0.06066 0.05801 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.54723e-07 ( -3.62765e-08 3.53594e-08 ) ergs/cm2
Band function
Time interval is from 0.244 sec. to 8.116 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.16004 ( -0.926999 1.67382 )
beta : -1.97457 ( -0.310632 0.181111 )
Epeak [keV] : 50.2733 ( -23.4904 184.009 )
Norm@50keV : 1.872807E-02 ( -1.872807E-02 0.313697 )
------------------------------------------------------------
Chi-Squared = 33.46393 using 59 PHA bins.
Reduced chi-squared = 0.6084350 for 55 degrees of freedom
Null hypothesis probability = 0.990
Photon flux (15-150 keV) in 7.872 sec: 1.05162 ( -0.062449 0.06199 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.48874e-07 ( -3.38787e-08 3.42338e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.672 sec. to 3.672 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62589 ( -0.111075 0.112239 )
Norm@50keV : 1.959217E-02 ( -1.271028E-03 1.263496E-03) )
------------------------------------------------------------
Chi-Squared = 72.16284 using 59 PHA bins.
Reduced chi-squared = 1.266015 for 57 degrees of freedom
Null hypothesis probability = 8.504E-02
Photon flux (15-150 keV) in 1.000 sec: 2.53830 ( -0.1604 0.16058 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82708e-07 ( -1.269e-08 1.2715e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.672 sec. to 3.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38285 ( -0.505173 0.335647 )
Epeak [keV] : 122.172 ( -53.6042 9877.83 )
Norm@50keV : 2.627102E-02 ( -7.704975E-03 2.168872E-02) )
------------------------------------------------------------
Chi-Squared = 71.34623 using 59 PHA bins.
Reduced chi-squared = 1.274040 for 56 degrees of freedom
Null hypothesis probability = 8.118E-02
Photon flux (15-150 keV) in 1.000 sec: 2.51211 ( -0.16783 0.16599 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.78939e-07 ( -1.4487e-08 7.231e-09 ) ergs/cm2
Band function
Time interval is from 2.672 sec. to 3.672 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.982739 ( -9.01726 4.13556 )
beta : -1.85634 ( -8.14366 0.280227 )
Epeak [keV] : 65.9788 ( -65.8788 9934.02 )
Norm@50keV : 4.523349E-02 ( -0.132790 785.845 )
------------------------------------------------------------
Chi-Squared = 69.60004 using 59 PHA bins.
Reduced chi-squared = 1.265455 for 55 degrees of freedom
Null hypothesis probability = 8.893E-02
Photon flux (15-150 keV) in 1.000 sec: 2.49326 ( -0.17472 0.1689 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77614e-07 ( -1.4264e-08 1.4818e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 08:05:57 EST 2008