batgrbproduct Analysis for Trigger=294120
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 Dec 14 19:58:54 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger294120/SDC
======================================================================
Trigger: 00294120 Segment: 000
BAT Trigger Time: 213970161.344 [s; MET]
Trigger Stop: 213970177.728 [s; MET]
UTC: 2007-10-13T12:09:19.055540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 279.524890921608 Dec: 33.8574571315757 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.84
Image Trigger?: NO
Rate S/N Ratio: 10.9087121146357 [ if not an image trigger ]
Image S/N Ratio: 7.84
Flight Position: [ source = BAT ]
RA: 279.524890921608 Dec: 33.8574571315757 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 279.309551807887 Dec: 33.8208058679668 [deg; J2000]
{ 18h 37m 14.3s , +33d 49' 14.9" }
+/- 9.12534818763787 [arcmin] (estimated 90% radius based on SNR)
+/- 8.27081603686445 [arcmin] (formal 1-sigma fit error)
SNR: 1.2922110764954
RA = 18h 37m 14.3s (279.309552 deg.)
Dec = 33d 49' 15" (33.820806 deg.)
Angular difference between Flight and Ground position is 10.954688 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 279.792000025511 +/- 277.685567565928
Measured from: -5.11600002646446
to: 274.675999999046 [s; relative to TRIGTIME]
T50: 545.511999994516 +/- 531.822115479059
Measured from: -5.93999999761581
to: 539.571999996901 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 10.4039999842644
to: 11.4039999842644 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.93999999761581
to: 539.571999996901 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.093428 0.123423 -0.069819 0.096076
0.142421 0.140427 0.122406 0.106939 [error]
Peak 0.016321 0.018308 0.003433 0.010707
0.006455 0.006277 0.005274 0.004691 [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 3.82e-08 8.41e-10 4.65e-12 2.58e-14 3.90e-08 3.90e-08 erg/cm2
Error 5.61e-08 3.52e-08 3.65e-08 1.85e-07 6.35e-08 7.01e-08 erg/cm2
Peak flux Power-law 1.39e-01 1.35e-01 9.21e-02 9.85e-02 4.05e-01 4.64e-01 ph/cm2/s
Error 9.71e-02 5.79e-02 4.71e-02 1.22e-01 1.59e-01 1.78e-01 ph/cm2/s
Fluence Cutoff-PL 3.80e-08 8.37e-10 4.61e-12 2.55e-14 3.89e-08 3.89e-08 erg/cm2
Error 5.61e-08 3.52e-08 3.65e-08 1.83e-07 6.46e-08 7.01e-08 erg/cm2
Peak flux Cutoff-PL 1.38e-01 1.35e-01 9.20e-02 9.77e-02 4.05e-01 4.63e-01 ph/cm2/s
Error 9.71e-02 5.79e-02 4.71e-02 1.22e-01 1.59e-01 1.78e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 Band 4.65e-01 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+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
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 9.493 0.000 - - 1.62e-08 2.16e-05 56.520 57
CPL 1.680 0.000 0.6 0.0 1.08e+00 0.00e+00 56.422 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.553 0.835 - - 3.20e-03 1.29e-03 51.356 57
CPL 1.552 0.839 9998.0 5000.0 3.21e-03 1.30e-03 51.360 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 545.512 -5.940 539.572
T90 279.792 -5.116 274.676
T50 545.512 -5.940 539.572
Peak 1.000 10.404 11.404
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
279.3096 +33.8208 0.1482 30.8 -35.9 0.6086 1.3 TRIG_00294120
------------------------------------------
Foreground time interval of the image:
-5.940 539.572 (delta_t = 545.512 [sec])
Background time interval of the image:
-239.344 -96.030 (delta_t = 143.314 [sec])
-95.344 -5.940 (delta_t = 89.404 [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 -5.940 sec. to 539.572 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 9.49274 ( )
Norm@50keV : 1.617611E-08 ( -1.327577E-08 4.317171E-05) )
------------------------------------------------------------
Chi-Squared = 56.52011 using 59 PHA bins.
Reduced chi-squared = 0.9915809 for 57 degrees of freedom
Null hypothesis probability = 0.493
Photon flux (15-150 keV) in 545.5 sec: 2.625170E-03 ( -0.00262517 0.00589032 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90004e-08 ( -3.90004e-08 8.80732e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.940 sec. to 539.572 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68012 ( )
Epeak [keV] : 0.559353 ( )
Norm@50keV : 1.08150 ( )
------------------------------------------------------------
Chi-Squared = 56.42183 using 59 PHA bins.
Reduced chi-squared = 1.007533 for 56 degrees of freedom
Null hypothesis probability = 0.459
Photon flux (15-150 keV) in 545.5 sec: 2.616974E-03 ( -0.00261697 0.00589607 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.88716e-08 ( -3.88716e-08 9.03446e-08 ) ergs/cm2
Band function
Time interval is from -5.940 sec. to 539.572 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.03840 ( -0.961598 8.10623 )
beta : -9.37157 ( -20.0000 -11.1916 )
Epeak [keV] : 620.326 ( -620.226 9379.67 )
Norm@50keV : 2.554031E-06 ( -1.171488E-06 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 56.53501 using 59 PHA bins.
Reduced chi-squared = 1.027909 for 55 degrees of freedom
Null hypothesis probability = 0.417
Photon flux (15-150 keV) in 545.5 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 10.404 sec. to 11.404 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55314 ( -0.865353 0.804524 )
Norm@50keV : 3.198455E-03 ( -1.331233E-03 1.245166E-03) )
------------------------------------------------------------
Chi-Squared = 51.35612 using 59 PHA bins.
Reduced chi-squared = 0.9009846 for 57 degrees of freedom
Null hypothesis probability = 0.686
Photon flux (15-150 keV) in 1.000 sec: 0.405291 ( -0.158232 0.159278 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.01216e-08 ( -1.28358e-08 1.3209e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.404 sec. to 11.404 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55229 ( -0.869780 0.807573 )
Epeak [keV] : 9998.00 ( -9997.99 1.99707 )
Norm@50keV : 3.206248E-03 ( -1.341360E-03 1.251661E-03) )
------------------------------------------------------------
Chi-Squared = 51.35983 using 59 PHA bins.
Reduced chi-squared = 0.9171399 for 56 degrees of freedom
Null hypothesis probability = 0.651
Photon flux (15-150 keV) in 1.000 sec: 0.405142 ( -0.158179 0.159234 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.00802e-08 ( -1.28059e-08 1.3246e-08 ) ergs/cm2
Band function
Time interval is from 10.404 sec. to 11.404 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21062 ( -8.78938 6.21062 )
beta : -1.55132 ( -8.44868 0.862967 )
Epeak [keV] : 47.4893 ( -47.3893 9952.51 )
Norm@50keV : 6.098336E-03 ( -6.098336E-03 23.2128 )
------------------------------------------------------------
Chi-Squared = 51.35505 using 59 PHA bins.
Reduced chi-squared = 0.9337282 for 55 degrees of freedom
Null hypothesis probability = 0.615
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Dec 14 20:15:06 EST 2007