batgrbproduct Analysis for Trigger=331964
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 Oct 18 11:11:56 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger331964/GCN5_download_cron
======================================================================
Trigger: 00331964 Segment: 000
BAT Trigger Time: 245979496 [s; MET]
Trigger Stop: 245979816 [s; MET]
UTC: 2008-10-17T23:38:12.816960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 230.179956090345 Dec: -32.815165184944 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.34
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.34
Flight Position: [ source = BAT ]
RA: 230.179956090345 Dec: -32.815165184944 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 230.208779582142 Dec: -32.7897988222791 [deg; J2000]
{ 15h 20m 50.1s , -32d 47' 23.3" }
+/- 2.28811426086122 [arcmin] (estimated 90% radius based on SNR)
+/- 1.41791226282059 [arcmin] (formal 1-sigma fit error)
SNR: 9.32349618131217
Angular difference between Flight and Ground position is 2.104639 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.825115 0.798801 0.661223 0.109210
0.109398 0.099277 0.087468 0.082779 [error]
Peak 0.825115 0.798801 0.661223 0.109210
0.109398 0.099277 0.087468 0.082779 [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 2.21e-07 3.73e-07 4.78e-07 1.23e-06 1.41e-06 2.29e-06 erg/cm2
Error 4.57e-08 4.73e-08 8.80e-08 4.85e-07 2.06e-07 5.59e-07 erg/cm2
Peak flux Power-law 2.23e-02 2.07e-02 1.33e-02 1.31e-02 6.17e-02 6.94e-02 ph/cm2/s
Error 4.71e-03 2.67e-03 2.35e-03 4.76e-03 7.81e-03 8.78e-03 ph/cm2/s
Fluence Cutoff-PL 2.15e-07 3.81e-07 4.81e-07 8.44e-07 1.38e-06 1.91e-06 erg/cm2
Error 5.25e-08 5.76e-08 9.16e-08 5.83e-07 2.29e-07 8.20e-07 erg/cm2
Peak flux Cutoff-PL 2.16e-02 2.11e-02 1.34e-02 9.75e-03 6.10e-02 6.59e-02 ph/cm2/s
Error 5.46e-03 3.19e-03 1.87e-03 9.05e-03 8.15e-03 1.04e-02 ph/cm2/s
Fluence Band 2.09e-07 3.81e-07 4.78e-07 9.96e-07 1.38e-06 2.03e-06 erg/cm2
Error 4.92e-08 5.81e-08 9.34e-08 4.65e-07 2.19e-07 7.57e-07 erg/cm2
Peak flux Band 2.15e-02 2.12e-02 1.34e-02 1.09e-02 6.09e-02 6.69e-02 ph/cm2/s
Error 4.23e-03 3.24e-03 1.89e-03 8.89e-03 8.26e-03 1.13e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.641 0.234 - - 4.74e-04 6.41e-05 44.224 57
CPL 1.219 0.753 87.1 0.0 7.90e-04 1.07e-03 44.171 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.641 0.234 - - 4.74e-04 6.41e-05 44.224 57
CPL 1.219 0.753 87.1 0.0 7.90e-04 1.07e-03 44.171 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
230.2088 -32.7898 0.0208 22.1 -50.4 2.3696 9.3 TRIG_00331964
------------------------------------------
Foreground time interval of the image:
0.000 320.000 (delta_t = 320.000 [sec])
Background time interval of the image:
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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64087 ( -0.230983 0.236251 )
Norm@50keV : 4.738997E-04 ( -6.463315E-05 6.354152E-05) )
------------------------------------------------------------
Chi-Squared = 44.22398 using 59 PHA bins.
Reduced chi-squared = 0.7758594 for 57 degrees of freedom
Null hypothesis probability = 0.892
Photon flux (15-150 keV) in 320.0 sec: 6.169471E-02 ( -0.00780268 0.00782032 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41169e-06 ( -2.04048e-07 2.08202e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21918 ( -0.852338 0.654581 )
Epeak [keV] : 87.1403 ( )
Norm@50keV : 7.896171E-04 ( -5.454122E-04 1.588799E-03) )
------------------------------------------------------------
Chi-Squared = 44.17067 using 59 PHA bins.
Reduced chi-squared = 0.7887620 for 56 degrees of freedom
Null hypothesis probability = 0.874
Photon flux (15-150 keV) in 320.0 sec: 6.096858E-02 ( -0.00832237 0.00798609 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38073e-06 ( -2.35635e-07 2.22922e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21313 ( -10.3153 4.68468 )
beta : -1.97363 ( -0.349043 0.249092 )
Epeak [keV] : 83.8501 ( -26.8119 407.660 )
Norm@50keV : 8.029931E-04 ( -1.611456E-02 70.1914 )
------------------------------------------------------------
Chi-Squared = 44.10232 using 59 PHA bins.
Reduced chi-squared = 0.8018603 for 55 degrees of freedom
Null hypothesis probability = 0.854
Photon flux (15-150 keV) in 320.0 sec: 6.093514E-02 ( -0.00828823 0.00823681 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38014e-06 ( -2.07315e-07 2.30736e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64087 ( -0.230983 0.236251 )
Norm@50keV : 4.738997E-04 ( -6.463315E-05 6.354152E-05) )
------------------------------------------------------------
Chi-Squared = 44.22398 using 59 PHA bins.
Reduced chi-squared = 0.7758594 for 57 degrees of freedom
Null hypothesis probability = 0.892
Photon flux (15-150 keV) in 320.0 sec: 6.169471E-02 ( -0.00780268 0.00782032 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41169e-06 ( -2.04048e-07 2.08202e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21918 ( -0.852338 0.654581 )
Epeak [keV] : 87.1403 ( )
Norm@50keV : 7.896171E-04 ( -5.454122E-04 1.588799E-03) )
------------------------------------------------------------
Chi-Squared = 44.17067 using 59 PHA bins.
Reduced chi-squared = 0.7887620 for 56 degrees of freedom
Null hypothesis probability = 0.874
Photon flux (15-150 keV) in 320.0 sec: 6.096858E-02 ( -0.00832237 0.00798609 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38073e-06 ( -2.35635e-07 2.22922e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21313 ( -10.3153 4.68468 )
beta : -1.97363 ( -0.348531 0.249092 )
Epeak [keV] : 83.8501 ( -26.8119 407.660 )
Norm@50keV : 8.029931E-04 ( -1.611456E-02 70.1914 )
------------------------------------------------------------
Chi-Squared = 44.10232 using 59 PHA bins.
Reduced chi-squared = 0.8018603 for 55 degrees of freedom
Null hypothesis probability = 0.854
Photon flux (15-150 keV) in 320.0 sec: 6.093514E-02 ( -0.00828823 0.00823681 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38014e-06 ( -2.07315e-07 2.30736e-07 ) ergs/cm2
Plot creation:
Sat Oct 18 11:38:04 EDT 2008