batgrbproduct Analysis for Trigger=203755
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): Mon Dec 31 16:55:38 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger203755/SDC
======================================================================
Trigger: 00203755 Segment: 000
BAT Trigger Time: 165762738.24 [s; MET]
Trigger Stop: 165762739.264 [s; MET]
UTC: 2006-04-03T13:12:17.129580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 282.306272499452 Dec: 8.32978203469296 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.6
Image Trigger?: NO
Rate S/N Ratio: 20.1246117974981 [ if not an image trigger ]
Image S/N Ratio: 9.6
Flight Position: [ source = BAT ]
RA: 282.306272499452 Dec: 8.32978203469296 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 282.337180178467 Dec: 8.33112455063393 [deg; J2000]
{ 18h 49m 20.9s , +08d 19' 52.0" }
+/- 1.05867051253617 [arcmin] (estimated 90% radius based on SNR)
+/- 0.3895287080206 [arcmin] (formal 1-sigma fit error)
SNR: 28.0379195114703
RA = 18h 49m 20.9s (282.337180 deg.)
Dec = 8d 19' 52" (8.331125 deg.)
Angular difference between Flight and Ground position is 1.836661 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 27.2760000228882 +/- 4.89690720027714
Measured from: -4.16800001263618
to: 23.108000010252 [s; relative to TRIGTIME]
T50: 14.1960000097752 +/- 1.75144282870157
Measured from: 0.139999985694885
to: 14.33599999547 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.80399999022484
to: 2.80399999022484 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.2320000231266
to: 32.0839999914169 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.366584 0.714791 0.657997 0.166457
0.034327 0.034398 0.029829 0.024450 [error]
Peak 0.009803 0.052658 0.050147 0.015048
0.005620 0.005874 0.005385 0.004144 [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 1.10e-07 2.63e-07 4.98e-07 2.29e-06 1.35e-06 3.16e-06 erg/cm2
Error 1.21e-08 1.70e-08 2.78e-08 3.01e-07 7.27e-08 3.13e-07 erg/cm2
Peak flux Power-law 1.75e-01 2.68e-01 3.06e-01 6.71e-01 9.48e-01 1.42e+00 ph/cm2/s
Error 5.04e-02 4.79e-02 3.96e-02 1.84e-01 1.28e-01 2.02e-01 ph/cm2/s
Fluence Cutoff-PL 1.01e-07 2.69e-07 5.18e-07 1.46e-06 1.33e-06 2.34e-06 erg/cm2
Error 1.50e-08 1.88e-08 3.43e-08 6.49e-07 7.70e-08 6.36e-07 erg/cm2
Peak flux Cutoff-PL 1.18e-01 2.76e-01 3.58e-01 2.71e-01 9.14e-01 1.02e+00 ph/cm2/s
Error 5.99e-02 5.69e-02 5.62e-02 1.92e-01 1.30e-01 2.28e-01 ph/cm2/s
Fluence Band 1.00e-07 2.68e-07 5.17e-07 1.46e-06 1.33e-06 2.36e-06 erg/cm2
Error 1.48e-08 1.87e-08 3.43e-08 5.13e-07 7.69e-08 6.44e-07 erg/cm2
Peak flux Band 1.18e-01 2.76e-01 3.58e-01 2.71e-01 9.14e-01 1.02e+00 ph/cm2/s
Error 5.99e-02 5.69e-02 5.62e-02 1.90e-01 1.30e-01 2.28e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.078 0.092 - - 3.34e-03 1.74e-04 54.708 57
CPL 0.732 0.368 210.3 3006.6 4.78e-03 1.82e-03 51.853 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.805 0.220 - - 8.25e-03 1.14e-03 63.368 57
CPL -0.484 1.151 118.3 101.4 2.81e-02 3.78e-02 58.090 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: 22.272000 sec.
T50 in the 50-300 keV band: 8.512000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 38.316 -6.232 32.084
T90 27.276 -4.168 23.108
T50 14.196 0.140 14.336
Peak 1.000 1.804 2.804
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
282.3372 +8.3311 0.0067 4.5 89.9 1.5827 28.0 TRIG_00203755
------------------------------------------
Foreground time interval of the image:
-6.232 17.765 (delta_t = 23.997 [sec])
Background time interval of the image:
-239.240 -6.232 (delta_t = 233.008 [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 -6.232 sec. to 32.084 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07816 ( -9.325331E-02 9.157407E-02) )
Norm@50keV : 3.343846E-03 ( -1.740968E-04 1.733664E-04) )
------------------------------------------------------------
Chi-Squared = 54.70811 using 59 PHA bins.
Reduced chi-squared = 0.9597914 for 57 degrees of freedom
Null hypothesis probability = 0.562
Photon flux (15-150 keV) in 38.32 sec: 0.387087 ( -0.020997 0.021048 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34929e-06 ( -7.26049e-08 7.2785e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.232 sec. to 32.084 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.731513 ( -0.399370 0.335705 )
Epeak [keV] : 210.279 ( -82.5747 5930.55 )
Norm@50keV : 4.777733E-03 ( -1.322078E-03 2.316162E-03) )
------------------------------------------------------------
Chi-Squared = 51.85297 using 59 PHA bins.
but latest trial 1.06931 gives Chi-Squared = 2.76872
Reduced chi-squared = 0.9259459 for 56 degrees of freedom
Null hypothesis probability = 0.633
Photon flux (15-150 keV) in 38.32 sec: 0.381420 ( -0.021754 0.021652 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32885e-06 ( -7.71841e-08 7.67396e-08 ) ergs/cm2
Band function
Time interval is from -6.232 sec. to 32.084 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.285112 ( -3.71803 0.996858 )
beta : -1.20277 ( -0.112954 0.120556 )
Epeak [keV] : 62.3643 ( -32.7617 132.115 )
Norm@50keV : 2.136420E-02 ( -10.5535 15.6284 )
------------------------------------------------------------
Chi-Squared = 49.80318 using 59 PHA bins.
Reduced chi-squared = 0.9055125 for 55 degrees of freedom
Null hypothesis probability = 0.673
Photon flux (15-150 keV) in 38.32 sec: 0.377439 ( -0.022167 0.021444 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32809e-06 ( -7.7211e-08 7.6571e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.804 sec. to 2.804 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.804511 ( -0.226531 0.213076 )
Norm@50keV : 8.253448E-03 ( -1.146391E-03 1.126722E-03) )
------------------------------------------------------------
Chi-Squared = 63.36795 using 59 PHA bins.
Reduced chi-squared = 1.111718 for 57 degrees of freedom
Null hypothesis probability = 0.262
Photon flux (15-150 keV) in 1.000 sec: 0.948435 ( -0.127483 0.128205 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.62942e-08 ( -1.27571e-08 1.27858e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.804 sec. to 2.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.483748 ( -1.31077 0.991552 )
Epeak [keV] : 118.302 ( -31.0656 171.764 )
Norm@50keV : 2.806648E-02 ( -1.683899E-02 5.877320E-02) )
------------------------------------------------------------
Chi-Squared = 58.08962 using 59 PHA bins.
Reduced chi-squared = 1.037315 for 56 degrees of freedom
Null hypothesis probability = 0.398
Photon flux (15-150 keV) in 1.000 sec: 0.914115 ( -0.12967 0.130755 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.32797e-08 ( -1.37402e-08 1.34603e-08 ) ergs/cm2
Band function
Time interval is from 1.804 sec. to 2.804 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.483723 ( -0.991466 1.15398 )
beta : -9.24777 ( -0.752230 8.42591 )
Epeak [keV] : 118.303 ( -45.3867 171.818 )
Norm@50keV : 2.806756E-02 ( -1.684042E-02 5.883461E-02) )
------------------------------------------------------------
Chi-Squared = 58.08966 using 59 PHA bins.
Reduced chi-squared = 1.056176 for 55 degrees of freedom
Null hypothesis probability = 0.362
Photon flux (15-150 keV) in 1.000 sec: 0.914047 ( -0.129583 0.130823 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.3159e-08 ( -1.3647e-08 1.3539e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 17:16:40 EST 2007