batgrbproduct Analysis for Trigger=131213
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 Jan 7 09:28:50 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger131213/SDC
======================================================================
Trigger: 00131213 Segment: 000
BAT Trigger Time: 139330546.944 [s; MET]
Trigger Stop: 139330555.136 [s; MET]
UTC: 2005-06-01T14:55:47.392860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.236604355148 Dec: -39.9146500434185 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11
Image Trigger?: NO
Rate S/N Ratio: 11.8743420870379 [ if not an image trigger ]
Image S/N Ratio: 11
Flight Position: [ source = BAT ]
RA: 135.236604355148 Dec: -39.9146500434185 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 135.226453217047 Dec: -39.8722259825307 [deg; J2000]
{ 09h 00m 54.3s , -39d 52' 20.0" }
+/- 2.24110744368454 [arcmin] (estimated 90% radius based on SNR)
+/- 1.34604453232334 [arcmin] (formal 1-sigma fit error)
SNR: 9.60411631864959
RA = 9h 0m 54.3s (135.226453 deg.)
Dec = -39d 52' 20" (-39.872226 deg.)
Angular difference between Flight and Ground position is 2.587982 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 315.248000025749 +/- 239.14408153779
Measured from: -253.552000015974
to: 61.6960000097752 [s; relative to TRIGTIME]
T50: 239.416000008583 +/- 221.375762815009
Measured from: -233.140000015497
to: 6.27599999308586 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 154.919999986887
to: 155.919999986887 [s; relative to TRIGTIME]
Total Fluence
Measured from: -261.252000004053
to: 236.944000005722 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.871315 4.553324 0.267418 0.099582
0.111807 0.113517 0.097461 0.085696 [error]
Peak 0.032731 0.026743 0.010580 0.006763
0.004441 0.004484 0.003599 0.003050 [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 2.37e-06 1.67e-06 7.82e-07 5.13e-07 5.07e-06 5.33e-06 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 3.41e-01 2.06e-01 8.00e-02 4.15e-02 6.48e-01 6.68e-01 ph/cm2/s
Error 7.46e-02 3.81e-02 2.93e-02 2.81e-02 1.09e-01 1.15e-01 ph/cm2/s
Fluence Cutoff-PL 2.36e-06 1.68e-06 7.83e-07 5.10e-07 5.07e-06 5.33e-06 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 Cutoff-PL 3.41e-01 2.06e-01 7.99e-02 4.11e-02 6.48e-01 6.68e-01 ph/cm2/s
Error 7.46e-02 3.81e-02 2.93e-02 2.79e-02 1.09e-01 1.14e-01 ph/cm2/s
Fluence Band 1.91e-06 1.83e-06 5.69e-07 2.41e-07 4.38e-06 4.79e-06 erg/cm2
Error 9.38e-08 7.48e-08 5.29e-08 1.89e-08 1.83e-07 2.04e-07 erg/cm2
Peak flux Band 2.90e-01 2.17e-01 6.70e-02 2.64e-02 6.48e-01 6.79e-01 ph/cm2/s
Error 4.06e-02 2.45e-02 1.11e-02 1.09e-01 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 3.097 0.000 - - 8.08e-04 0.00e+00 166.040 57
CPL -0.460 0.000 22.8 2.6 1.54e-01 0.00e+00 59.804 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.368 0.375 - - 3.57e-03 9.87e-04 50.084 57
CPL 2.714 0.837 245.3 4910.3 2.31e-03 2.16e-03 49.065 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 498.196 -261.252 236.944
T90 315.248 -253.552 61.696
T50 239.416 -233.140 6.276
Peak 1.000 154.920 155.920
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.2265 -39.8722 0.0200 22.8 -7.0 6.4050 9.6 TRIG_00131213
------------------------------------------
Foreground time interval of the image:
-261.252 236.944 (delta_t = 498.196 [sec])
Background time interval of the image:
-299.944 -261.252 (delta_t = 38.692 [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 -261.252 sec. to 236.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.09702 ( )
Norm@50keV : 8.084315E-04 ( )
------------------------------------------------------------
Chi-Squared = 166.0402 using 59 PHA bins.
Reduced chi-squared = 2.912986 for 57 degrees of freedom
Null hypothesis probability = 1.364E-12
Photon flux (15-150 keV) in 498.2 sec: 0.238792 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.06789e-06 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -261.252 sec. to 236.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.460363 ( )
Epeak [keV] : 22.8441 ( -4.00487 1.24569 )
Norm@50keV : 0.154117 ( )
------------------------------------------------------------
Chi-Squared = 59.80367 using 59 PHA bins.
Reduced chi-squared = 1.067923 for 56 degrees of freedom
Null hypothesis probability = 0.339
Photon flux (15-150 keV) in 498.2 sec: 0.200925 ( -0.01287 0.012957 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.06794e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -261.252 sec. to 236.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32910 ( -4.875374E-02 0.197520 )
beta : -9.19464 ( -0.642909 19.3570 )
Epeak [keV] : 14.1322 ( -2.22908 2.41538 )
Norm@50keV : 9.391437E-03 ( -0.197512 0.759021 )
------------------------------------------------------------
Chi-Squared = 88.42537 using 59 PHA bins.
Reduced chi-squared = 1.607734 for 55 degrees of freedom
Null hypothesis probability = 2.850E-03
Photon flux (15-150 keV) in 498.2 sec: 0.238557 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.38107e-06 ( -1.79038e-07 1.8681e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 154.920 sec. to 155.920 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.36785 ( -0.352025 0.398474 )
Norm@50keV : 3.570821E-03 ( -9.995508E-04 9.752768E-04) )
------------------------------------------------------------
Chi-Squared = 50.08410 using 59 PHA bins.
Reduced chi-squared = 0.8786684 for 57 degrees of freedom
Null hypothesis probability = 0.730
Photon flux (15-150 keV) in 1.000 sec: 0.648470 ( -0.109467 0.109475 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.4592e-08 ( -7.4226e-09 7.8034e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 154.920 sec. to 155.920 sec.
Photon index: 2.71384 ( -1.42838 0.246338 )
Epeak [keV] : 245.347 ( -66.0199 9754.65 )
Norm@50keV : 2.311331E-03 ( -2.311331E-03 2.017063E-03) )
------------------------------------------------------------
Chi-Squared = 49.06524 using 59 PHA bins.
but latest trial 2.96017 gives Chi-Squared = 46.7610
but latest trial 179.959 gives Chi-Squared = 0.505592
but latest trial 4.320920E-03 gives Chi-Squared = 2.67210
Reduced chi-squared = 0.8761650 for 56 degrees of freedom
Null hypothesis probability = 0.733
Photon flux (15-150 keV) in 1.000 sec: 0.648228 ( -0.109428 0.10944 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.45834e-08 ( -7.4174e-09 7.7955e-09 ) ergs/cm2
Band function
Time interval is from 154.920 sec. to 155.920 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49714 ( -8.50286 6.49714 )
beta : -2.49253 ( -2.27018 0.448897 )
Epeak [keV] : 13.3343 ( -13.2343 26.5221 )
Norm@50keV : 1.739207E-02 ( -34.8405 1138.17 )
------------------------------------------------------------
Chi-Squared = 49.65757 using 59 PHA bins.
Reduced chi-squared = 0.9028649 for 55 degrees of freedom
Null hypothesis probability = 0.678
Photon flux (15-150 keV) in 1.000 sec: 0.647687 ( -0.109668 0.108619 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36458e-08 ( -6.2643e-09 7.0406e-09 ) ergs/cm2
Plot creation:
Mon Jan 7 09:42:07 EST 2008