batgrbproduct Analysis for Trigger=323650
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): Thu Sep 4 05:25:30 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger323650/GCN5_download_cron
======================================================================
Trigger: 00323650 Segment: 000
BAT Trigger Time: 242160834.476 [s; MET]
Trigger Stop: 242160834.492 [s; MET]
UTC: 2008-09-03T18:53:51.406300 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 75.2669524534146 Dec: 45.2611080547911 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.91
Image Trigger?: NO
Rate S/N Ratio: 145.251506016289 [ if not an image trigger ]
Image S/N Ratio: 18.91
Flight Position: [ source = BAT ]
RA: 75.2669524534146 Dec: 45.2611080547911 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 75.2731849618181 Dec: 45.2541680101709 [deg; J2000]
{ 05h 01m 05.6s , +45d 15' 15.0" }
+/- 0.927568005994465 [arcmin] (estimated 90% radius based on SNR)
+/- 0.255735692083452 [arcmin] (formal 1-sigma fit error)
SNR: 33.8662643262873
Angular difference between Flight and Ground position is 0.492628 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 0.0920000076293945 +/- 0.024331070032646
Measured from: 8.94069671630859e-08
to: 0.0920000970363617 [s; relative to TRIGTIME]
T50: 0.0360000133514404 +/- 0.00400000810623169
Measured from: 0.00400006771087646
to: 0.0400000810623169 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.436000019311905
to: 0.563999980688095 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00400000810623169
to: 0.127999991178513 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.086847 0.101104 0.038495 -0.001201
0.004004 0.004141 0.002743 0.001415 [error]
Peak 0.086682 0.101335 0.038423 -0.001109
0.004017 0.004158 0.002755 0.001418 [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 3.08e-08 3.13e-08 2.24e-08 2.56e-08 9.46e-08 1.11e-07 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 Power-law 7.46e+00 4.23e+00 1.52e+00 7.13e-01 1.36e+01 1.39e+01 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 2.27e-08 4.19e-08 2.65e-08 3.92e-09 9.46e-08 9.56e-08 erg/cm2
Error 2.57e-09 2.64e-09 3.00e-09 1.87e-09 5.37e-09 0.00e+00 erg/cm2
Peak flux Cutoff-PL 5.36e+00 5.51e+00 1.87e+00 1.52e-01 1.29e+01 1.29e+01 ph/cm2/s
Error 6.33e-01 3.41e-01 1.97e-01 6.88e-02 7.89e-01 7.93e-01 ph/cm2/s
Fluence Band 2.28e-08 4.17e-08 2.65e-08 3.90e-09 9.45e-08 9.78e-08 erg/cm2
Error 2.51e-09 2.20e-09 2.58e-09 6.46e-10 5.72e-09 0.00e+00 erg/cm2
Peak flux Band 5.37e+00 5.50e+00 1.87e+00 1.55e-01 1.29e+01 1.29e+01 ph/cm2/s
Error 6.19e-01 3.15e-01 1.80e-01 4.08e-02 7.72e-01 7.34e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.485 0.000 - - 7.19e-02 0.00e+00 160.175 57
CPL 0.081 0.545 37.6 2.9 1.40e+00 1.11e+00 55.588 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.482 0.000 - - 7.00e-02 0.00e+00 155.819 57
CPL 0.106 0.545 37.5 2.9 1.32e+00 1.04e+00 53.487 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: 0.128000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.132 -0.004 0.128
T90 0.092 0.000 0.092
T50 0.036 0.004 0.040
Peak 1.000 -0.436 0.564
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
75.2732 +45.2542 0.0057 9.7 49.6 0.2327 33.9 TRIG_00323650
------------------------------------------
Foreground time interval of the image:
-0.004 0.128 (delta_t = 0.132 [sec])
Background time interval of the image:
-239.476 -0.004 (delta_t = 239.472 [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 -0.004 sec. to 0.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.48534 ( )
Norm@50keV : 7.191865E-02 ( )
------------------------------------------------------------
Chi-Squared = 160.1746 using 59 PHA bins.
Reduced chi-squared = 2.810080 for 57 degrees of freedom
Null hypothesis probability = 9.694E-12
Photon flux (15-150 keV) in 0.1320 sec: 14.0015 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.45652e-08 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 8.095438E-02 ( -0.583612 0.506917 )
Epeak [keV] : 37.5506 ( -3.03708 2.70167 )
Norm@50keV : 1.40074 ( -0.658346 1.55436 )
------------------------------------------------------------
Chi-Squared = 55.58779 using 59 PHA bins.
Reduced chi-squared = 0.9926391 for 56 degrees of freedom
Null hypothesis probability = 0.490
Photon flux (15-150 keV) in 0.1320 sec: 13.2485 ( -0.8098 0.8137 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.45868e-08 ( -4.99594e-09 5.749e-09 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.357709 ( -0.182338 0.965255 )
beta : -9.37167 ( -2.861023E-05 5.23435 )
Epeak [keV] : 37.3878 ( -2.49183 2.52402 )
Norm@50keV : 0.975022 ( -6.179583E-02 0.207321 )
------------------------------------------------------------
Chi-Squared = 56.73245 using 59 PHA bins.
Reduced chi-squared = 1.031499 for 55 degrees of freedom
Null hypothesis probability = 0.410
Photon flux (15-150 keV) in 0.1320 sec: 13.2499 ( -0.8082 0.8076 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.44645e-08 ( -5.69276e-09 5.74332e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.004 sec. to 0.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.48188 ( )
Norm@50keV : 6.996514E-02 ( )
------------------------------------------------------------
Chi-Squared = 155.8185 using 59 PHA bins.
Reduced chi-squared = 2.733659 for 57 degrees of freedom
Null hypothesis probability = 4.066E-11
Photon flux (15-150 keV) in 0.1360 sec: 13.5927 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.46992e-08 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.105678 ( -0.583993 0.505711 )
Epeak [keV] : 37.5192 ( -3.07584 2.73381 )
Norm@50keV : 1.31606 ( -0.617769 1.46403 )
------------------------------------------------------------
Chi-Squared = 53.48709 using 59 PHA bins.
Reduced chi-squared = 0.9551266 for 56 degrees of freedom
Null hypothesis probability = 0.571
Photon flux (15-150 keV) in 0.1360 sec: 12.8709 ( -0.7877 0.791 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.46914e-08 ( -5.74165e-09 5.78313e-09 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.132 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.357361 ( -0.291451 0.892184 )
beta : -9.35667 ( -4.863739E-05 0.643459 )
Epeak [keV] : 36.9078 ( -2.70353 3.73708 )
Norm@50keV : 0.955150 ( -0.314433 2.05539 )
------------------------------------------------------------
Chi-Squared = 54.13399 using 59 PHA bins.
Reduced chi-squared = 0.9842544 for 55 degrees of freedom
Null hypothesis probability = 0.508
Photon flux (15-150 keV) in 0.1360 sec: 12.8818 ( -0.7643 0.7802 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.41278e-08 ( -5.36588e-09 5.20445e-09 ) ergs/cm2
Plot creation:
Thu Sep 4 05:53:00 EDT 2008