batgrbproduct Analysis for Trigger=340923
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 v2.42
Process Start Time (local time): Fri Jan 23 14:10:07 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger340923/GCN5_download_cron
======================================================================
Trigger: 00340923 Segment: 000
BAT Trigger Time: 254414909.536 [s; MET]
Trigger Stop: 254414909.552 [s; MET]
UTC: 2009-01-23T14:48:25.096260 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 237.702935804616 Dec: -54.316287107192 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.71
Image Trigger?: NO
Rate S/N Ratio: 94.0956959695819 [ if not an image trigger ]
Image S/N Ratio: 15.71
Flight Position: [ source = BAT ]
RA: 237.702935804616 Dec: -54.316287107192 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 237.710799544383 Dec: -54.3146816831551 [deg; J2000]
{ 15h 50m 50.6s , -54d 18' 52.9" }
+/- 1.09777766945187 [arcmin] (estimated 90% radius based on SNR)
+/- 0.380709153365653 [arcmin] (formal 1-sigma fit error)
SNR: 26.6219998535197
Angular difference between Flight and Ground position is 0.291595 arcmin
Partial Coding Fraction: 0.390625 [ including projection effects ]
Duration
T90: 0.224000006914139 +/- 0.0441814445652141
Measured from: -0.0159999132156372
to: 0.208000093698502 [s; relative to TRIGTIME]
T50: 0.108000010251999 +/- 0.00894427670812023
Measured from: 0.00400006771087646
to: 0.112000077962875 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.380000025033951
to: 0.619999974966049 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0200000107288361
to: 0.255999982357025 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.149483 0.185925 0.099196 0.000612
0.008907 0.009667 0.007628 0.003889 [error]
Peak 0.149483 0.185870 0.098580 0.000231
0.008923 0.009688 0.007657 0.003907 [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 5.56e-08 7.33e-08 7.09e-08 1.23e-07 2.40e-07 3.49e-07 erg/cm2
Error 5.06e-09 4.65e-09 6.59e-09 2.19e-08 1.63e-08 0.00e+00 erg/cm2
Peak flux Power-law 6.47e+00 4.72e+00 2.28e+00 1.56e+00 1.42e+01 1.50e+01 ph/cm2/s
Error 6.02e-01 3.02e-01 2.06e-01 2.63e-01 9.33e-01 9.58e-01 ph/cm2/s
Fluence Cutoff-PL 4.69e-08 8.43e-08 7.82e-08 3.61e-08 2.34e-07 2.72e-07 erg/cm2
Error 6.06e-09 6.31e-09 8.11e-09 1.67e-08 1.67e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 5.33e+00 5.35e+00 2.56e+00 6.03e-01 1.37e+01 1.38e+01 ph/cm2/s
Error 7.21e-01 3.93e-01 2.59e-01 2.37e-01 9.46e-01 9.81e-01 ph/cm2/s
Fluence Band 4.60e-08 8.39e-08 7.80e-08 3.63e-08 2.34e-07 2.76e-07 erg/cm2
Error 4.41e-09 6.29e-09 8.09e-09 1.62e-08 1.67e-08 0.00e+00 erg/cm2
Peak flux Band 5.33e+00 5.35e+00 2.56e+00 6.03e-01 1.37e+01 1.38e+01 ph/cm2/s
Error 7.21e-01 3.93e-01 2.59e-01 2.31e-01 9.45e-01 9.81e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.047 0.104 - - 9.41e-02 6.70e-03 66.373 57
CPL 0.844 0.499 47.3 5.8 3.95e-01 2.52e-01 45.499 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.048 0.104 - - 9.26e-02 6.62e-03 66.971 57
CPL 0.848 0.499 47.2 5.8 3.89e-01 2.49e-01 46.180 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: 0.704000 sec.
T50 in the 50-300 keV band: 0.256000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.276 -0.020 0.256
T90 0.224 -0.016 0.208
T50 0.108 0.004 0.112
Peak 1.000 -0.380 0.620
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
237.7108 -54.3147 0.0072 34.8 -119.8 0.4368 26.6 TRIG_00340923
------------------------------------------
Foreground time interval of the image:
-0.020 0.256 (delta_t = 0.276 [sec])
Background time interval of the image:
-119.536 -0.020 (delta_t = 119.516 [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 -0.020 sec. to 0.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04656 ( -0.101593 0.105584 )
Norm@50keV : 9.407361E-02 ( -6.728142E-03 6.662920E-03) )
------------------------------------------------------------
Chi-Squared = 66.37283 using 59 PHA bins.
Reduced chi-squared = 1.164436 for 57 degrees of freedom
Null hypothesis probability = 0.185
Photon flux (15-150 keV) in 0.2760 sec: 14.4219 ( -0.9443 0.9453 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.40138e-07 ( -1.62931e-08 1.63734e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.020 sec. to 0.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.843937 ( -0.522699 0.475031 )
Epeak [keV] : 47.3404 ( -5.82457 5.80311 )
Norm@50keV : 0.395038 ( -0.168147 0.335170 )
------------------------------------------------------------
Chi-Squared = 45.49876 using 59 PHA bins.
Reduced chi-squared = 0.8124779 for 56 degrees of freedom
Null hypothesis probability = 0.841
Photon flux (15-150 keV) in 0.2760 sec: 13.9161 ( -0.9563 0.9611 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33972e-07 ( -1.665e-08 1.67151e-08 ) ergs/cm2
Band function
Time interval is from -0.020 sec. to 0.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.857808 ( -0.461190 0.535475 )
beta : -9.22690 ( -0.773101 6.44887 )
Epeak [keV] : 47.3168 ( -5.45815 5.81665 )
Norm@50keV : 0.388604 ( -0.161749 0.342081 )
------------------------------------------------------------
Chi-Squared = 45.50168 using 59 PHA bins.
Reduced chi-squared = 0.8273033 for 55 degrees of freedom
Null hypothesis probability = 0.816
Photon flux (15-150 keV) in 0.2760 sec: 13.9156 ( -0.956 0.9614 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33746e-07 ( -1.66514e-08 1.66762e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.0044 -0.8084 0.8461
R^2/D10^2 : 3.53084 -0.80812 1.0596
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 84.28389 using 59 PHA bins.
Reduced chi-squared = 1.478665 for 57 degrees of freedom
Null hypothesis probability = 1.090E-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.970e-08 3.052e-09
25- 50 9.352e-08 7.237e-09
50-150 8.105e-08 1.160e-08
15-150 2.043e-07 1.437e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 71.2251 -10.488 13.1122
Norm : 71.3218 -6.6284 7.2652
------------------------------------------------------------
Chi-Squared = 48.27962 using 59 PHA bins.
Reduced chi-squared = 0.8470109 for 57 degrees of freedom
Null hypothesis probability = 0.788
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.059e-08 4.452e-09
25- 50 8.087e-08 5.088e-09
50-150 1.052e-07 1.340e-08
15-150 2.367e-07 1.612e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.87089 -1.4386 1.91864
R1^2/D10^2 : 56.2277 -39.3926 114.264
kT2 [keV] : 15.7935 -1.8901 2.9053
R2^2/D10^2 : 0.997614 -0.562682 0.411536
------------------------------------------------------------
Chi-Squared = 45.68066 using 59 PHA bins.
but latest trial 274.847 gives Chi-Squared = 368.886
but latest trial 1.77817 gives Chi-Squared = 57.3722
Reduced chi-squared = 0.8305575 for 55 degrees of freedom
Null hypothesis probability = 0.811
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.819e-08 1.439e-08
25- 50 8.003e-08 1.372e-08
50-150 1.035e-07 1.695e-08
15-150 2.318e-07 3.737e-08
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.020 sec. to 0.260 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04843 ( -0.101883 0.105906 )
Norm@50keV : 9.258227E-02 ( -6.650187E-03 6.585225E-03) )
------------------------------------------------------------
Chi-Squared = 66.97109 using 59 PHA bins.
Reduced chi-squared = 1.174931 for 57 degrees of freedom
Null hypothesis probability = 0.172
Photon flux (15-150 keV) in 0.2800 sec: 14.2057 ( -0.9322 0.9337 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39788e-07 ( -1.63274e-08 1.64094e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.020 sec. to 0.260 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.847550 ( -0.523474 0.475408 )
Epeak [keV] : 47.1750 ( -5.85302 5.81743 )
Norm@50keV : 0.388794 ( -0.165785 0.331419 )
------------------------------------------------------------
Chi-Squared = 46.17961 using 59 PHA bins.
Reduced chi-squared = 0.8246359 for 56 degrees of freedom
Null hypothesis probability = 0.822
Photon flux (15-150 keV) in 0.2800 sec: 13.7130 ( -0.9441 0.9482 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33591e-07 ( -1.67023e-08 1.67583e-08 ) ergs/cm2
Band function
Time interval is from -0.020 sec. to 0.260 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.861096 ( -0.461876 0.535787 )
beta : -9.25028 ( -0.749716 6.47864 )
Epeak [keV] : 47.1459 ( -5.98149 5.83649 )
Norm@50keV : 0.382660 ( -0.159682 0.258533 )
------------------------------------------------------------
Chi-Squared = 46.18240 using 59 PHA bins.
Reduced chi-squared = 0.8396800 for 55 degrees of freedom
Null hypothesis probability = 0.796
Photon flux (15-150 keV) in 0.2800 sec: 13.7128 ( -0.9439 0.9455 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33377e-07 ( -1.67104e-08 1.67112e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9535 -0.8102 0.85
R^2/D10^2 : 3.53099 -0.81407 1.06798
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 84.85890 using 59 PHA bins.
Reduced chi-squared = 1.488753 for 57 degrees of freedom
Null hypothesis probability = 9.760E-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.987e-08 3.058e-09
25- 50 9.357e-08 6.391e-09
50-150 8.018e-08 1.089e-08
15-150 2.036e-07 1.585e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 70.9095 -10.4431 13.1129
Norm : 70.3875 -6.5791 7.1848
------------------------------------------------------------
Chi-Squared = 48.91017 using 59 PHA bins.
Reduced chi-squared = 0.8580731 for 57 degrees of freedom
Null hypothesis probability = 0.768
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.063e-08 4.325e-09
25- 50 8.084e-08 5.377e-09
50-150 1.048e-07 1.392e-08
15-150 2.363e-07 1.715e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.96856 -1.47064 1.91827
R1^2/D10^2 : 51.3731 -35.4385 194.201
kT2 [keV] : 15.8794 -1.9501 3.0017
R2^2/D10^2 : 0.952705 -0.546846 0.410085
------------------------------------------------------------
Chi-Squared = 46.52855 using 59 PHA bins.
but latest trial 1.73013 gives Chi-Squared = 58.3013
Reduced chi-squared = 0.8459737 for 55 degrees of freedom
Null hypothesis probability = 0.785
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.804e-08 1.500e-08
25- 50 8.017e-08 1.243e-08
50-150 1.032e-07 2.018e-08
15-150 2.314e-07 3.210e-08
Plot creation:
Fri Jan 23 14:20:00 EST 2009