batgrbproduct Analysis for Trigger=323542
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 Sep 3 13:53:58 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger323542/GCN5_download_cron
======================================================================
Trigger: 00323542 Segment: 000
BAT Trigger Time: 242097146.368 [s; MET]
Trigger Stop: 242097147.392 [s; MET]
UTC: 2008-09-03T01:12:23.300160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 86.796749000734 Dec: 51.3264586033656 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.95
Image Trigger?: NO
Rate S/N Ratio: 14.2126704035519 [ if not an image trigger ]
Image S/N Ratio: 8.95
Flight Position: [ source = BAT ]
RA: 86.796749000734 Dec: 51.3264586033656 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 86.7900434431965 Dec: 51.2562075866366 [deg; J2000]
{ 05h 47m 09.6s , +51d 15' 22.3" }
+/- 0.924752158663322 [arcmin] (estimated 90% radius based on SNR)
+/- 0.243164827125962 [arcmin] (formal 1-sigma fit error)
SNR: 34.0136774411355
Angular difference between Flight and Ground position is 4.222564 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 66.447999984026 +/- 10.4731085993435
Measured from: -7.83199989795685
to: 58.6160000860691 [s; relative to TRIGTIME]
T50: 20.9679999947548 +/- 3.31554460537187
Measured from: -0.363999903202057
to: 20.6040000915527 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -2.45600000023842
to: -1.45600000023842 [s; relative to TRIGTIME]
Total Fluence
Measured from: -10.5439999997616
to: 68.0200000107288 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.883689 1.112322 0.614587 0.098268
0.044379 0.045053 0.041789 0.041538 [error]
Peak 0.023755 0.040457 0.032908 0.010796
0.005115 0.005419 0.005096 0.004730 [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 2.58e-07 4.14e-07 5.02e-07 1.19e-06 1.52e-06 2.38e-06 erg/cm2
Error 2.22e-08 2.17e-08 4.05e-08 2.03e-07 9.30e-08 2.38e-07 erg/cm2
Peak flux Power-law 1.99e-01 2.48e-01 2.26e-01 3.58e-01 7.95e-01 1.03e+00 ph/cm2/s
Error 5.52e-02 4.25e-02 3.96e-02 1.33e-01 1.20e-01 1.71e-01 ph/cm2/s
Fluence Cutoff-PL 2.26e-07 4.48e-07 4.99e-07 3.45e-07 1.38e-06 1.51e-06 erg/cm2
Error 2.78e-08 2.87e-08 4.58e-08 2.25e-07 1.13e-07 2.54e-07 erg/cm2
Peak flux Cutoff-PL 1.66e-01 2.70e-01 2.41e-01 1.32e-01 7.62e-01 8.09e-01 ph/cm2/s
Error 6.95e-02 5.42e-02 4.69e-02 2.03e-01 1.30e-01 2.48e-01 ph/cm2/s
Fluence Band 2.23e-07 4.48e-07 4.91e-07 5.86e-07 1.40e-06 1.73e-06 erg/cm2
Error 2.79e-08 2.92e-08 3.71e-08 4.72e-07 8.32e-08 3.89e-07 erg/cm2
Peak flux Band 1.50e-01 2.82e-01 2.36e-01 2.07e-01 7.57e-01 8.72e-01 ph/cm2/s
Error 7.22e-02 5.67e-02 4.71e-02 1.71e-01 1.20e-01 2.07e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.722 0.100 - - 2.09e-03 1.21e-04 72.241 57
CPL 0.847 0.518 60.3 14.6 6.07e-03 4.20e-03 62.046 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.136 0.256 - - 6.83e-03 1.02e-03 69.296 57
CPL 0.171 1.489 95.2 4966.9 2.08e-02 8.09e-02 67.650 0
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: 29.312000 sec.
T50 in the 50-300 keV band: 11.392000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 78.564 -10.544 68.020
T90 66.448 -7.832 58.616
T50 20.968 -0.364 20.604
Peak 1.000 -2.456 -1.456
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
86.7900 +51.2562 0.0056 9.7 -123.5 1.9242 34.0 TRIG_00323542
------------------------------------------
Foreground time interval of the image:
-10.544 15.733 (delta_t = 26.277 [sec])
Background time interval of the image:
-239.368 -10.544 (delta_t = 228.824 [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 -10.544 sec. to 68.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72203 ( -9.965873E-02 0.101250 )
Norm@50keV : 2.088360E-03 ( -1.214060E-04 1.204966E-04) )
------------------------------------------------------------
Chi-Squared = 72.24052 using 59 PHA bins.
Reduced chi-squared = 1.267378 for 57 degrees of freedom
Null hypothesis probability = 8.408E-02
Photon flux (15-150 keV) in 78.56 sec: 0.279525 ( -0.014756 0.014772 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51657e-06 ( -9.24494e-08 9.35021e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.544 sec. to 68.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.846864 ( -0.549879 0.486706 )
Epeak [keV] : 60.3471 ( -8.49911 20.6819 )
Norm@50keV : 6.074461E-03 ( -2.684251E-03 5.722228E-03) )
------------------------------------------------------------
Chi-Squared = 62.04599 using 59 PHA bins.
Reduced chi-squared = 1.107964 for 56 degrees of freedom
Null hypothesis probability = 0.269
Photon flux (15-150 keV) in 78.56 sec: 0.264500 ( -0.016691 0.016717 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38143e-06 ( -1.11202e-07 1.15727e-07 ) ergs/cm2
Band function
Time interval is from -10.544 sec. to 68.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.884786 ( -0.411844 0.886928 )
beta : -2.40338 ( -7.59662 0.453856 )
Epeak [keV] : 60.0593 ( -14.1874 8.61914 )
Norm@50keV : 5.869355E-03 ( -2.311084E-03 1.341887E-02) )
------------------------------------------------------------
Chi-Squared = 61.54260 using 59 PHA bins.
Reduced chi-squared = 1.118956 for 55 degrees of freedom
Null hypothesis probability = 0.253
Photon flux (15-150 keV) in 78.56 sec: 0.264941 ( -0.016993 0.015546 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39586e-06 ( -5.74745e-08 1.08868e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -2.456 sec. to -1.456 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13617 ( -0.259218 0.253524 )
Norm@50keV : 6.832064E-03 ( -1.019968E-03 1.019695E-03) )
------------------------------------------------------------
Chi-Squared = 69.29610 using 59 PHA bins.
Reduced chi-squared = 1.215721 for 57 degrees of freedom
Null hypothesis probability = 0.127
Photon flux (15-150 keV) in 1.000 sec: 0.795493 ( -0.119983 0.120117 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.06367e-08 ( -1.19569e-08 1.21431e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.456 sec. to -1.456 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.170966 ( -1.85623 1.12098 )
Epeak [keV] : 95.2048 ( -29.0558 9904.79 )
Norm@50keV : 2.077908E-02 ( -1.646228E-02 0.145269 )
------------------------------------------------------------
Chi-Squared = 67.64953 using 59 PHA bins.
but latest trial 53.2581 gives Chi-Squared = 6.79848
but latest trial 5.332247E-03 gives Chi-Squared = 7.69374
Reduced chi-squared = 1.208027 for 56 degrees of freedom
Null hypothesis probability = 0.137
Photon flux (15-150 keV) in 1.000 sec: 0.762471 ( -0.132027 0.128847 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.45612e-08 ( -1.45176e-08 1.47e-08 ) ergs/cm2
Band function
Time interval is from -2.456 sec. to -1.456 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.429046 ( )
beta : -1.44914 ( )
Epeak [keV] : 109.279 ( )
Norm@50keV : 1.553870E-02 ( )
------------------------------------------------------------
Chi-Squared = 67.23885 using 59 PHA bins.
Reduced chi-squared = 1.222525 for 55 degrees of freedom
Null hypothesis probability = 0.125
Photon flux (15-150 keV) in 1.000 sec: 0.757297 ( -0.127267 0.112965 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.45926e-08 ( -1.45083e-08 1.4706e-08 ) ergs/cm2
Plot creation:
Wed Sep 3 14:18:53 EDT 2008