batgrbproduct Analysis for Trigger=131177
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 17:25:45 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger131177/SDC
======================================================================
Trigger: 00131177 Segment: 000
BAT Trigger Time: 139313266.88 [s; MET]
Trigger Stop: 139313293.76 [s; MET]
UTC: 2005-06-01T10:07:47.329180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 134.906947573277 Dec: -40.9701915043352 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7
Image Trigger?: NO
Rate S/N Ratio: 12.0415945787923 [ if not an image trigger ]
Image S/N Ratio: 7
Flight Position: [ source = BAT ]
RA: 134.906947573277 Dec: -40.9701915043352 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 134.776569563655 Dec: -41.0860900257224 [deg; J2000]
{ 08h 59m 06.4s , -41d 05' 09.9" }
+/- 7.61729608969335 [arcmin] (estimated 90% radius based on SNR)
+/- 5.95035975111253 [arcmin] (formal 1-sigma fit error)
SNR: 1.67264161672186
RA = 8h 59m 6.4s (134.776570 deg.)
Dec = -41d 5' 10" (-41.086090 deg.)
Angular difference between Flight and Ground position is 9.120446 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 26.8799999952316 +/-
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
T50: 26.8799999952316 +/-
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 26.8799999952316 second)
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.021424 -0.005122 -0.005612 -0.021739
0.021645 0.021998 0.018744 0.016041 [error]
Peak 0.021424 -0.005122 -0.005612 -0.021739
0.021645 0.021998 0.018744 0.016041 [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 3.50e-10 7.14e-10 1.15e-09 4.17e-09 3.21e-09 6.87e-09 erg/cm2
Error 4.17e-09 5.05e-09 8.85e-09 3.50e-07 2.41e-08 3.54e-07 erg/cm2
Peak flux Power-law 4.14e-04 4.68e-04 3.77e-04 5.16e-04 1.44e-03 1.74e-03 ph/cm2/s
Error 5.15e-03 3.34e-03 2.81e-03 3.11e-02 9.96e-03 3.21e-02 ph/cm2/s
Fluence Cutoff-PL 2.41e-10 1.58e-09 2.95e-09 8.20e-10 5.50e-09 5.37e-09 erg/cm2
Error 5.05e-09 7.17e-09 1.18e-08 3.85e-07 2.41e-08 3.89e-07 erg/cm2
Peak flux Cutoff-PL 3.61e-04 9.24e-04 9.73e-04 1.48e-04 2.38e-03 2.19e-03 ph/cm2/s
Error 6.21e-03 4.68e-03 3.83e-03 3.38e-02 9.89e-03 1.90e-02 ph/cm2/s
Fluence Band 2.49e-10 1.68e-09 3.35e-09 5.93e-10 6.13e-09 5.61e-09 erg/cm2
Error 6.98e-09 1.11e-08 3.69e-07 2.08e-08 6.38e-07 0.00e+00 erg/cm2
Peak flux Band 1.14e-04 7.96e-04 1.20e-03 1.80e-04 2.41e-03 2.16e-03 ph/cm2/s
Error 1.97e-03 2.60e-03 4.02e-03 3.24e-02 9.82e-03 1.20e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.351 6.500 - - 1.20e-05 8.14e-05 67.910 57
CPL -2.214 0.000 68.0 5000.0 9.21e-04 5.00e+23 67.859 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.351 6.500 - - 1.20e-05 8.14e-05 67.910 57
CPL -2.214 0.000 68.0 5000.0 9.21e-04 5.00e+23 67.859 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 26.880 0.000 26.880
T90 26.880 0.000 26.880
T50 26.880 0.000 26.880
Peak 26.880 0.000 26.880
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
134.7766 -41.0861 0.1141 13.0 -11.7 0.0732 1.7 TRIG_00131177
------------------------------------------
Foreground time interval of the image:
0.000 26.880 (delta_t = 26.880 [sec])
Background time interval of the image:
-299.880 -42.880 (delta_t = 257.000 [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 0.000 sec. to 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35147 ( -4.35147 8.64853 )
Norm@50keV : 1.198627E-05 ( -1.198627E-05 1.508933E-04) )
------------------------------------------------------------
Chi-Squared = 67.90985 using 59 PHA bins.
Reduced chi-squared = 1.191401 for 57 degrees of freedom
Null hypothesis probability = 0.153
Photon flux (15-150 keV) in 26.88 sec: 1.444035E-03 ( -0.00144403 0.0184727 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.20869e-09 ( -3.20869e-09 4.506e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.21424 ( )
Epeak [keV] : 68.0394 ( -68.0021 9931.99 )
Norm@50keV : 9.209187E-04 ( -1.496507E-03 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 67.85867 using 59 PHA bins.
Reduced chi-squared = 1.211762 for 56 degrees of freedom
Null hypothesis probability = 0.133
Photon flux (15-150 keV) in 26.88 sec: 2.382950E-03 ( -0.00238295 0.0173926 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.50252e-09 ( -5.50252e-09 4.26895e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.95181 ( -14.9797 2.026606E-02) )
beta : -9.37128 ( -0.628514 19.3715 )
Epeak [keV] : 69.1823 ( -69.0762 9930.82 )
Norm@50keV : 1.354223E-03 ( -6.788763E-03 131495. )
------------------------------------------------------------
Chi-Squared = 67.84761 using 59 PHA bins.
Reduced chi-squared = 1.233593 for 55 degrees of freedom
Null hypothesis probability = 0.114
Photon flux (15-150 keV) in 26.88 sec: 2.406876E-03 ( -0.00240688 0.0172367 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.12974e-09 ( -6.12974e-09 3.54235e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35147 ( -4.35147 8.64853 )
Norm@50keV : 1.198627E-05 ( -1.198627E-05 1.508933E-04) )
------------------------------------------------------------
Chi-Squared = 67.90985 using 59 PHA bins.
Reduced chi-squared = 1.191401 for 57 degrees of freedom
Null hypothesis probability = 0.153
Photon flux (15-150 keV) in 26.88 sec: 1.444035E-03 ( -0.00144403 0.0184727 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.20869e-09 ( -3.20869e-09 4.506e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.21424 ( )
Epeak [keV] : 68.0394 ( -68.0021 9931.99 )
Norm@50keV : 9.209187E-04 ( -1.496507E-03 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 67.85867 using 59 PHA bins.
Reduced chi-squared = 1.211762 for 56 degrees of freedom
Null hypothesis probability = 0.133
Photon flux (15-150 keV) in 26.88 sec: 2.382950E-03 ( -0.00238295 0.0173926 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.50252e-09 ( -5.50252e-09 4.26895e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.95181 ( -14.9797 2.026606E-02) )
beta : -9.37128 ( -0.628514 19.3715 )
Epeak [keV] : 69.1823 ( -69.0762 9930.82 )
Norm@50keV : 1.354223E-03 ( -6.788763E-03 131495. )
------------------------------------------------------------
Chi-Squared = 67.84761 using 59 PHA bins.
Reduced chi-squared = 1.233593 for 55 degrees of freedom
Null hypothesis probability = 0.114
Photon flux (15-150 keV) in 26.88 sec: 2.406876E-03 ( -0.00240688 0.0172367 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.12974e-09 ( -6.12974e-09 3.54235e-08 ) ergs/cm2
Plot creation:
Thu Jan 10 17:40:42 EST 2008