batgrbproduct Analysis for Trigger=322590
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 Aug 28 18:31:17 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger322590/GCN5_download_cron
======================================================================
Trigger: 00322590 Segment: 000
BAT Trigger Time: 241604112.384 [s; MET]
Trigger Stop: 241604113.408 [s; MET]
UTC: 2008-08-28T08:15:09.330680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 323.467313774246 Dec: 42.0014163182813 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.76
Image Trigger?: NO
Rate S/N Ratio: 7 [ if not an image trigger ]
Image S/N Ratio: 6.76
Flight Position: [ source = BAT ]
RA: 323.467313774246 Dec: 42.0014163182813 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 323.458151268726 Dec: 41.9684720403909 [deg; J2000]
{ 21h 33m 50.0s , +41d 58' 06.5" }
+/- 3.22561505867292 [arcmin] (estimated 90% radius based on SNR)
+/- 1.66330616091508 [arcmin] (formal 1-sigma fit error)
SNR: 5.70859246708579
Angular difference between Flight and Ground position is 2.018455 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.640000015497208 +/- 0.181019323508289
Measured from: 0.296000093221664
to: 0.936000108718872 [s; relative to TRIGTIME]
T50: 0.448000013828278 +/- 0.181019323508289
Measured from: 0.424000084400177
to: 0.872000098228455 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.148000001907349
to: 1.14800000190735 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.296000003814697
to: 1 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.004172 0.020776 0.014416 0.003197
0.003930 0.004043 0.003616 0.003040 [error]
Peak 0.004172 0.020776 0.014416 0.003197
0.003930 0.004043 0.003616 0.003040 [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 2.71e-09 5.67e-09 9.26e-09 3.40e-08 2.56e-08 5.22e-08 erg/cm2
Error 1.29e-09 1.73e-09 3.21e-09 2.58e-08 8.10e-09 2.82e-08 erg/cm2
Peak flux Power-law 1.24e-01 1.41e-01 1.15e-01 1.57e-01 4.37e-01 5.37e-01 ph/cm2/s
Error 6.00e-02 4.40e-02 3.88e-02 1.09e-01 1.25e-01 1.60e-01 ph/cm2/s
Fluence Cutoff-PL 2.26e-09 6.37e-09 9.96e-09 8.86e-09 2.37e-08 2.77e-08 erg/cm2
Error 1.47e-09 2.22e-09 4.00e-09 2.86e-08 8.65e-09 3.02e-08 erg/cm2
Peak flux Cutoff-PL 1.01e-01 1.56e-01 1.26e-01 5.45e-02 4.21e-01 4.38e-01 ph/cm2/s
Error 6.80e-02 5.48e-02 4.71e-02 1.27e-01 1.28e-01 1.82e-01 ph/cm2/s
Fluence Band 2.22e-09 6.62e-09 9.24e-09 2.20e-08 2.44e-08 4.01e-08 erg/cm2
Error 8.34e-10 1.58e-09 3.90e-09 2.36e-08 8.46e-09 2.45e-08 erg/cm2
Peak flux Band 1.01e-01 1.56e-01 1.26e-01 5.41e-02 4.21e-01 4.37e-01 ph/cm2/s
Error 6.79e-02 5.55e-02 3.55e-02 1.27e-01 1.28e-01 1.83e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.291 0.470 - - 3.67e-03 1.04e-03 47.543 57
CPL 0.160 1.988 82.1 5000.0 1.35e-02 1.94e-01 46.469 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.291 0.470 - - 3.67e-03 1.04e-03 47.543 57
CPL 0.160 1.988 82.1 5000.0 1.35e-02 1.94e-01 46.469 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.704 0.296 1.000
T90 0.640 0.296 0.936
T50 0.448 0.424 0.872
Peak 1.000 0.148 1.148
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
323.4582 +41.9685 0.0339 5.4 179.8 0.0410 5.7 TRIG_00322590
------------------------------------------
Foreground time interval of the image:
0.296 1.000 (delta_t = 0.704 [sec])
Background time interval of the image:
-239.384 0.296 (delta_t = 239.680 [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 0.296 sec. to 1.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29124 ( -0.472736 0.467754 )
Norm@50keV : 3.671771E-03 ( -1.046558E-03 1.042279E-03) )
------------------------------------------------------------
Chi-Squared = 47.54326 using 59 PHA bins.
Reduced chi-squared = 0.8340923 for 57 degrees of freedom
Null hypothesis probability = 0.810
Photon flux (15-150 keV) in 0.7040 sec: 0.437356 ( -0.125134 0.125531 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55842e-08 ( -7.97639e-09 8.22216e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.296 sec. to 1.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.159834 ( -2.82889 1.14758 )
Epeak [keV] : 82.1359 ( -82.1259 9917.86 )
Norm@50keV : 1.353572E-02 ( -1.353572E-02 0.373849 )
------------------------------------------------------------
Chi-Squared = 46.46874 using 59 PHA bins.
but latest trial 1.95690 gives Chi-Squared = 6.18311
Reduced chi-squared = 0.8297990 for 56 degrees of freedom
Null hypothesis probability = 0.814
Photon flux (15-150 keV) in 0.7040 sec: 0.420797 ( -0.127106 0.128267 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37241e-08 ( -8.50108e-09 8.80303e-09 ) ergs/cm2
Band function
Time interval is from 0.296 sec. to 1.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.158516 ( -1.48945 2.20544 )
beta : -9.36518 ( -0.634820 7.84002 )
Epeak [keV] : 82.1091 ( -29.1614 9917.89 )
Norm@50keV : 1.355263E-02 ( -10.9187 7.30436 )
------------------------------------------------------------
Chi-Squared = 46.46872 using 59 PHA bins.
Reduced chi-squared = 0.8448859 for 55 degrees of freedom
Null hypothesis probability = 0.787
Photon flux (15-150 keV) in 0.7040 sec: 0.420556 ( -0.126862 0.128627 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44334e-08 ( -8.80979e-09 8.1167e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.296 sec. to 1.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29124 ( -0.472736 0.467754 )
Norm@50keV : 3.671771E-03 ( -1.046558E-03 1.042279E-03) )
------------------------------------------------------------
Chi-Squared = 47.54326 using 59 PHA bins.
Reduced chi-squared = 0.8340923 for 57 degrees of freedom
Null hypothesis probability = 0.810
Photon flux (15-150 keV) in 0.7040 sec: 0.437356 ( -0.125134 0.125531 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55842e-08 ( -7.97639e-09 8.22216e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.296 sec. to 1.000 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.159834 ( -2.82889 1.14758 )
Epeak [keV] : 82.1359 ( -82.1259 9917.86 )
Norm@50keV : 1.353572E-02 ( -1.353572E-02 0.373849 )
------------------------------------------------------------
Chi-Squared = 46.46874 using 59 PHA bins.
but latest trial 1.95690 gives Chi-Squared = 6.18311
Reduced chi-squared = 0.8297990 for 56 degrees of freedom
Null hypothesis probability = 0.814
Photon flux (15-150 keV) in 0.7040 sec: 0.420797 ( -0.127106 0.128267 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37241e-08 ( -8.50108e-09 8.80303e-09 ) ergs/cm2
Band function
Time interval is from 0.296 sec. to 1.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.158516 ( -1.48945 2.20544 )
beta : -9.36518 ( -0.634820 7.84002 )
Epeak [keV] : 82.1091 ( -29.1614 9917.89 )
Norm@50keV : 1.355263E-02 ( -10.9187 7.30436 )
------------------------------------------------------------
Chi-Squared = 46.46872 using 59 PHA bins.
Reduced chi-squared = 0.8448859 for 55 degrees of freedom
Null hypothesis probability = 0.787
Photon flux (15-150 keV) in 0.7040 sec: 0.420556 ( -0.126862 0.128627 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44334e-08 ( -8.80979e-09 8.1167e-09 ) ergs/cm2
Plot creation:
Thu Aug 28 18:45:50 EDT 2008