batgrbproduct Analysis for Trigger=330367
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): Fri Oct 3 20:52:39 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger330367/GCN5_download_cron
======================================================================
Trigger: 00330367 Segment: 000
BAT Trigger Time: 244725377.044 [s; MET]
Trigger Stop: 244725377.108 [s; MET]
UTC: 2008-10-03T11:16:13.898260 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 237.704247420092 Dec: -54.3084172458207 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 18.24
Image Trigger?: NO
Rate S/N Ratio: 74.1350119714025 [ if not an image trigger ]
Image S/N Ratio: 18.24
Flight Position: [ source = BAT ]
RA: 237.704247420092 Dec: -54.3084172458207 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 237.730650094256 Dec: -54.2944799210204 [deg; J2000]
{ 15h 50m 55.4s , -54d 17' 40.1" }
+/- 0.811505807926857 [arcmin] (estimated 90% radius based on SNR)
+/- 0.234149123409485 [arcmin] (formal 1-sigma fit error)
SNR: 40.9922505238823
Angular difference between Flight and Ground position is 1.246513 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.608000010251999 +/- 0.0644980707101847
Measured from: 8.94069671630859e-08
to: 0.608000099658966 [s; relative to TRIGTIME]
T50: 0.30799999833107 +/- 0.0252982065794067
Measured from: 0.0480000972747803
to: 0.35600009560585 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.157999992370605
to: 0.842000007629395 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0600000023841858
to: 0.743999987840652 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.152540 0.237707 0.086178 0.001619
0.006441 0.007067 0.005108 0.004005 [error]
Peak 0.152540 0.237707 0.086178 0.001619
0.006441 0.007067 0.005108 0.004005 [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 5.60e-08 7.41e-08 7.25e-08 1.27e-07 2.44e-07 3.48e-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 2.26e+00 1.66e+00 8.12e-01 5.63e-01 5.00e+00 5.30e+00 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 4.21e-08 9.85e-08 6.44e-08 6.58e-09 2.11e-07 2.17e-07 erg/cm2
Error 4.06e-09 5.06e-09 6.50e-09 3.25e-09 1.09e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.65e+00 2.17e+00 7.73e-01 4.44e-02 4.64e+00 4.64e+00 ph/cm2/s
Error 1.67e-01 1.10e-01 7.02e-02 2.06e-02 2.27e-01 2.27e-01 ph/cm2/s
Fluence Band 4.01e-08 1.00e-07 6.19e-08 2.56e-08 2.17e-07 2.40e-07 erg/cm2
Error 4.55e-09 4.46e-09 5.29e-09 1.28e-08 1.10e-08 0.00e+00 erg/cm2
Peak flux Band 1.61e+00 2.21e+00 7.47e-01 1.35e-01 4.65e+00 4.78e+00 ph/cm2/s
Error 1.82e-01 9.42e-02 5.68e-02 6.86e-02 2.13e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.033 0.000 - - 3.28e-02 0.00e+00 190.766 57
CPL -0.774 0.537 41.3 1.8 1.29e+00 1.02e+00 55.422 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.033 0.000 - - 3.28e-02 0.00e+00 190.766 57
CPL -0.774 0.537 41.3 1.8 1.30e+00 1.02e+00 55.422 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: 0.448000 sec.
T50 in the 50-300 keV band: 0.256000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.804 -0.060 0.744
T90 0.608 0.000 0.608
T50 0.308 0.048 0.356
Peak 1.000 -0.158 0.842
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
237.7307 -54.2945 0.0047 0.0 143.5 0.4806 41.0 TRIG_00330367
------------------------------------------
Foreground time interval of the image:
-0.060 0.744 (delta_t = 0.804 [sec])
Background time interval of the image:
-239.044 -221.044 (delta_t = 18.000 [sec])
-220.044 -131.824 (delta_t = 88.220 [sec])
-131.044 -0.060 (delta_t = 130.984 [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.
- 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 -0.060 sec. to 0.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03308 ( )
Norm@50keV : 3.281298E-02 ( )
------------------------------------------------------------
Chi-Squared = 190.7664 using 59 PHA bins.
Reduced chi-squared = 3.346779 for 57 degrees of freedom
Null hypothesis probability = 2.499E-16
Photon flux (15-150 keV) in 0.8040 sec: 4.99828 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43769e-07 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.060 sec. to 0.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.774268 ( -0.563752 0.510838 )
Epeak [keV] : 41.3115 ( -1.71441 1.82018 )
Norm@50keV : 1.29483 ( -0.629893 1.41802 )
------------------------------------------------------------
Chi-Squared = 55.42176 using 59 PHA bins.
Reduced chi-squared = 0.9896744 for 56 degrees of freedom
Null hypothesis probability = 0.497
Photon flux (15-150 keV) in 0.8040 sec: 4.64111 ( -0.22618 0.22725 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11158e-07 ( -1.0702e-08 1.10944e-08 ) ergs/cm2
Band function
Time interval is from -0.060 sec. to 0.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.104498 ( -0.742738 0.842807 )
beta : -9.16619 ( -6.08034 13.9196 )
Epeak [keV] : 41.8296 ( -2.84282 2.09966 )
Norm@50keV : 0.410589 ( -1.35350 7.51574 )
------------------------------------------------------------
Chi-Squared = 64.14574 using 59 PHA bins.
Reduced chi-squared = 1.166286 for 55 degrees of freedom
Null hypothesis probability = 0.187
Photon flux (15-150 keV) in 0.8040 sec: 4.63727 ( -0.21477 0.20317 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17351e-07 ( -1.05597e-08 1.14884e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.5611 -0.3883 0.4031
R^2/D10^2 : 2.05414 -0.28515 0.32887
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 61.52488 using 59 PHA bins.
Reduced chi-squared = 1.079384 for 57 degrees of freedom
Null hypothesis probability = 0.317
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.813e-08 2.882e-09
25- 50 1.022e-07 4.498e-09
50-150 6.235e-08 6.323e-09
15-150 2.027e-07 8.703e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 60.5790
Norm : 26.8601
------------------------------------------------------------
Chi-Squared = 117.1343 using 59 PHA bins.
Reduced chi-squared = 2.054987 for 57 degrees of freedom
Null hypothesis probability = 4.795E-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.436e-08 3.247e-09
25- 50 8.297e-08 3.393e-09
50-150 9.517e-08 9.286e-09
15-150 2.325e-07 1.138e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.17293 -3.00937 1.25397
R1^2/D10^2 : 2.80433 -0.42283 0.78336
kT2 [keV] : 17.9753 -11.8207 101.505
R2^2/D10^2 : 7.413875E-02
------------------------------------------------------------
Chi-Squared = 53.66719 using 59 PHA bins.
but latest trial 2.03787 gives Chi-Squared = 3.33285
but latest trial 4.32642 gives Chi-Squared = 3.17006
but latest trial 98.8361 gives Chi-Squared = 2.25392
Reduced chi-squared = 0.9757670 for 55 degrees of freedom
Null hypothesis probability = 0.526
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.108e-08 9.241e-09
25- 50 9.955e-08 3.347e-08
50-150 7.505e-08 3.687e-08
15-150 2.157e-07 7.714e-08
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.060 sec. to 0.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03312 ( )
Norm@50keV : 3.281226E-02 ( )
------------------------------------------------------------
Chi-Squared = 190.7664 using 59 PHA bins.
Reduced chi-squared = 3.346779 for 57 degrees of freedom
Null hypothesis probability = 2.499E-16
Photon flux (15-150 keV) in 0.8040 sec: 4.99830 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43775e-07 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.060 sec. to 0.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.774392 ( -0.563623 0.510964 )
Epeak [keV] : 41.3117 ( -1.71466 1.81992 )
Norm@50keV : 1.29502 ( -0.630078 1.41783 )
------------------------------------------------------------
Chi-Squared = 55.42177 using 59 PHA bins.
Reduced chi-squared = 0.9896744 for 56 degrees of freedom
Null hypothesis probability = 0.497
Photon flux (15-150 keV) in 0.8040 sec: 4.64110 ( -0.22617 0.22726 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11221e-07 ( -1.07326e-08 1.10638e-08 ) ergs/cm2
Band function
Time interval is from -0.060 sec. to 0.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.153219 ( -0.636992 1.14200 )
beta : -9.31622 ( -5.97022 14.0297 )
Epeak [keV] : 42.0063 ( -3.11789 1.90263 )
Norm@50keV : 0.387374 ( -2.18904 7.47940 )
------------------------------------------------------------
Chi-Squared = 65.54943 using 59 PHA bins.
Reduced chi-squared = 1.191808 for 55 degrees of freedom
Null hypothesis probability = 0.156
Photon flux (15-150 keV) in 0.8040 sec: 4.64861 ( -0.21987 0.20633 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17722e-07 ( -1.09505e-08 1.09215e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.5611 -0.3883 0.4031
R^2/D10^2 : 2.05413 -0.28514 0.32888
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 61.52490 using 59 PHA bins.
Reduced chi-squared = 1.079384 for 57 degrees of freedom
Null hypothesis probability = 0.317
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.813e-08 2.547e-09
25- 50 1.022e-07 3.968e-09
50-150 6.235e-08 5.926e-09
15-150 2.027e-07 8.989e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 60.5733
Norm : 26.8609
------------------------------------------------------------
Chi-Squared = 117.1343 using 59 PHA bins.
Reduced chi-squared = 2.054987 for 57 degrees of freedom
Null hypothesis probability = 4.795E-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.436e-08 3.509e-09
25- 50 8.297e-08 3.645e-09
50-150 9.516e-08 9.174e-09
15-150 2.325e-07 1.098e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.17297 -3.00941 1.20413
R1^2/D10^2 : 2.80435 -0.42285 0.78341
kT2 [keV] : 17.9761 -11.8215 139.072
R2^2/D10^2 : 7.412166E-02
------------------------------------------------------------
Chi-Squared = 53.66717 using 59 PHA bins.
but latest trial 10.4252 gives Chi-Squared = 2.84183
but latest trial 2.03785 gives Chi-Squared = 3.33250
but latest trial 4.32647 gives Chi-Squared = 3.16894
Reduced chi-squared = 0.9757668 for 55 degrees of freedom
Null hypothesis probability = 0.526
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.108e-08 8.363e-09
25- 50 9.955e-08 3.234e-08
50-150 7.505e-08 3.613e-08
15-150 2.157e-07 7.146e-08
Plot creation:
Fri Oct 3 21:11:58 EDT 2008