batgrbproduct Analysis for Trigger=141086
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): Thu Jan 10 17:41:54 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger141086/SDC
======================================================================
Trigger: 00141086 Segment: 000
BAT Trigger Time: 140461702.976 [s; MET]
Trigger Stop: 140461719.36 [s; MET]
UTC: 2005-06-14T17:08:23.403720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 133.55608223552 Dec: -40.9632754538101 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.32
Image Trigger?: NO
Rate S/N Ratio: 9.1104335791443 [ if not an image trigger ]
Image S/N Ratio: 12.32
Flight Position: [ source = BAT ]
RA: 133.55608223552 Dec: -40.9632754538101 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 133.382596352496 Dec: -40.9885774252457 [deg; J2000]
{ 08h 53m 31.8s , -40d 59' 18.9" }
+/- 1.46676163382374 [arcmin] (estimated 90% radius based on SNR)
+/- 0.633641044780357 [arcmin] (formal 1-sigma fit error)
SNR: 17.5979424063983
RA = 8h 53m 31.8s (133.382596 deg.)
Dec = -40d 59' 19" (-40.988577 deg.)
Angular difference between Flight and Ground position is 8.004043 arcmin
Partial Coding Fraction: 0.5 [ including projection effects ]
Duration
T90: 204 +/- 98.5203024761902
Measured from: -181.976000010967
to: 22.0239999890327 [s; relative to TRIGTIME]
T50: 204 +/- 132.925731143372
Measured from: -181.976000010967
to: 22.0239999890327 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -131.976000010967
to: -130.976000010967 [s; relative to TRIGTIME]
Total Fluence
Measured from: -181.976000010967
to: 22.0239999890327 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.323444 1.234213 0.022527 0.129746
0.099663 0.100849 0.087051 0.080165 [error]
Peak 0.022031 0.015655 0.011029 0.015274
0.007038 0.007140 0.006068 0.005764 [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 5.54e-07 4.51e-07 2.49e-07 2.02e-07 1.34e-06 1.46e-06 erg/cm2
Error 6.72e-08 5.69e-08 6.24e-08 9.11e-08 1.65e-07 2.08e-07 erg/cm2
Peak flux Power-law 1.41e-01 1.56e-01 1.23e-01 1.60e-01 4.79e-01 5.80e-01 ph/cm2/s
Error 1.34e-01 7.54e-02 5.25e-02 1.86e-01 1.88e-01 2.08e-01 ph/cm2/s
Fluence Cutoff-PL 5.13e-07 5.64e-07 5.67e-08 1.06e-10 1.13e-06 1.13e-06 erg/cm2
Error 7.70e-08 9.90e-08 4.37e-08 1.02e-09 1.29e-07 1.29e-07 erg/cm2
Peak flux Cutoff-PL 1.41e-01 1.56e-01 1.23e-01 1.59e-01 4.79e-01 5.79e-01 ph/cm2/s
Error 1.34e-01 7.55e-02 5.26e-02 1.85e-01 1.87e-01 2.07e-01 ph/cm2/s
Fluence Band 5.33e-07 5.41e-07 1.15e-07 2.77e-09 1.20e-06 1.09e-06 erg/cm2
Error 7.86e-08 6.96e-08 3.40e-08 1.30e-07 1.89e-07 0.00e+00 erg/cm2
Peak flux Band 1.26e-01 1.49e-01 1.26e-01 1.83e-01 4.66e-01 5.84e-01 ph/cm2/s
Error 4.78e-02 7.82e-02 4.79e-02 2.04e-01 1.78e-01 2.12e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.858 0.229 - - 5.84e-04 1.10e-04 81.520 57
CPL -1.566 1.506 24.2 3.0 6.48e-01 0.00e+00 56.907 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.345 0.862 - - 3.99e-03 1.46e-03 48.602 57
CPL 1.342 0.867 9998.9 5000.0 4.00e-03 1.46e-03 48.611 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 204.000 -181.976 22.024
T90 204.000 -181.976 22.024
T50 204.000 -181.976 22.024
Peak 1.000 -131.976 -130.976
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
133.3826 -40.9886 0.0109 42.1 -16.0 5.2789 17.6 TRIG_00141086
------------------------------------------
Foreground time interval of the image:
-181.976 22.024 (delta_t = 204.000 [sec])
Background time interval of the image:
-299.976 -181.976 (delta_t = 118.000 [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 -181.976 sec. to 22.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.85757 ( -0.219909 0.237405 )
Norm@50keV : 5.835622E-04 ( -1.086020E-04 1.110917E-04) )
------------------------------------------------------------
Chi-Squared = 81.52002 using 59 PHA bins.
Reduced chi-squared = 1.430176 for 57 degrees of freedom
Null hypothesis probability = 1.823E-02
Photon flux (15-150 keV) in 204.0 sec: 0.144935 ( -0.015095 0.015095 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34399e-06 ( -1.62129e-07 1.67019e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -181.976 sec. to 22.024 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.56623 ( -1.43377 1.57904 )
Epeak [keV] : 24.2498 ( -3.13177 2.95701 )
Norm@50keV : 0.647866 ( )
------------------------------------------------------------
Chi-Squared = 56.90651 using 59 PHA bins.
but latest trial 19.7829 gives Chi-Squared = 8.30494
Reduced chi-squared = 1.016188 for 56 degrees of freedom
Null hypothesis probability = 0.441
Photon flux (15-150 keV) in 204.0 sec: 0.136327 ( -0.014704 0.015168 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13362e-06 ( -1.23704e-07 1.3363e-07 ) ergs/cm2
Band function
Time interval is from -181.976 sec. to 22.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43382 ( -0.601867 0.598824 )
beta : -9.32368 ( -0.676321 19.3237 )
Epeak [keV] : 13.7057 ( -2.60046 6.65138 )
Norm@50keV : 4.898490E-03 ( -1.27967 70.5661 )
------------------------------------------------------------
Chi-Squared = 67.49542 using 59 PHA bins.
Reduced chi-squared = 1.227190 for 55 degrees of freedom
Null hypothesis probability = 0.120
Photon flux (15-150 keV) in 204.0 sec: 0.139543 ( -0.019671 0.014671 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20007e-06 ( -1.21496e-07 1.39414e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -131.976 sec. to -130.976 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34466 ( -0.948505 0.775321 )
Norm@50keV : 3.985146E-03 ( -1.500338E-03 1.415643E-03) )
------------------------------------------------------------
Chi-Squared = 48.60248 using 59 PHA bins.
Reduced chi-squared = 0.8526751 for 57 degrees of freedom
Null hypothesis probability = 0.778
Photon flux (15-150 keV) in 1.000 sec: 0.479437 ( -0.184866 0.190139 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.89952e-08 ( -1.4923e-08 1.4967e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -131.976 sec. to -130.976 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34155 ( -0.954186 0.780422 )
Epeak [keV] : 9998.87 ( -9998.86 1.13184 )
Norm@50keV : 4.000522E-03 ( -1.494143E-03 1.420563E-03) )
------------------------------------------------------------
Chi-Squared = 48.61087 using 59 PHA bins.
Reduced chi-squared = 0.8680512 for 56 degrees of freedom
Null hypothesis probability = 0.748
Photon flux (15-150 keV) in 1.000 sec: 0.479222 ( -0.1848 0.190089 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.89676e-08 ( -1.4908e-08 1.4991e-08 ) ergs/cm2
Band function
Time interval is from -131.976 sec. to -130.976 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00778 ( -8.99222 6.00778 )
beta : -1.33278 ( -8.66722 0.935610 )
Epeak [keV] : 57.1125 ( -57.0125 9942.89 )
Norm@50keV : 7.608405E-03 ( -302.273 2286.76 )
------------------------------------------------------------
Chi-Squared = 48.59814 using 59 PHA bins.
Reduced chi-squared = 0.8836026 for 55 degrees of freedom
Null hypothesis probability = 0.716
Photon flux (15-150 keV) in 1.000 sec: 0.465997 ( -0.178722 0.176623 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84409e-08 ( -1.38664e-08 1.39993e-08 ) ergs/cm2
Plot creation:
Thu Jan 10 17:57:51 EST 2008