batgrbproduct Analysis for Trigger=551126
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 batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sat Mar 16 07:14:11 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger551126/GCN5_download_cron
======================================================================
Trigger: 00551126 Segment: 000
BAT Trigger Time: 385044343.296 [s; MET]
Trigger Stop: 385044355.456 [s; MET]
UTC: 2013-03-15T12:45:32.970220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 157.542476803624 Dec: -51.8102228367283 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.07
Image Trigger?: NO
Rate S/N Ratio: 10.6301458127346 [ if not an image trigger ]
Image S/N Ratio: 8.07
Flight Position: [ source = BAT ]
RA: 157.542476803624 Dec: -51.8102228367283 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 157.541147533728 Dec: -51.7937310681136 [deg; J2000]
{ 10h 30m 09.9s , -51d 47' 37.4" }
+/- 1.32353496674533 [arcmin] (estimated 90% radius based on SNR)
+/- 0.495976834897246 [arcmin] (formal 1-sigma fit error)
SNR: 20.3803030625748
Angular difference between Flight and Ground position is 0.990734 arcmin
Partial Coding Fraction: 0.421875 [ including projection effects ]
Duration
T90: 233.379999935627 +/- 17.4808786701615
Measured from: 4.67200011014938
to: 238.052000045776 [s; relative to TRIGTIME]
T50: 139.707999944687 +/- 9.9838759986685
Measured from: 31.524000108242
to: 171.232000052929 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.40799999237061
to: 9.40799999237061 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.30000001192093
to: 267.995999991894 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.396834 2.952511 2.128377 0.436545
0.113031 0.115961 0.100423 0.083248 [error]
Peak 0.010978 0.044943 0.055727 0.007775
0.009264 0.010163 0.009383 0.007230 [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 8.99e-07 1.37e-06 1.57e-06 3.43e-06 4.86e-06 7.27e-06 erg/cm2
Error 7.03e-08 6.49e-08 9.87e-08 4.58e-07 2.35e-07 5.36e-07 erg/cm2
Peak flux Power-law 2.29e-01 2.97e-01 2.83e-01 4.77e-01 9.68e-01 1.29e+00 ph/cm2/s
Error 1.09e-01 9.16e-02 6.87e-02 2.31e-01 2.48e-01 3.09e-01 ph/cm2/s
Fluence Cutoff-PL 8.36e-07 1.42e-06 1.61e-06 1.96e-06 4.73e-06 5.82e-06 erg/cm2
Error 8.62e-08 7.82e-08 1.07e-07 9.09e-07 2.61e-07 9.38e-07 erg/cm2
Peak flux Cutoff-PL 1.51e-01 3.21e-01 3.40e-01 1.65e-01 9.27e-01 9.77e-01 ph/cm2/s
Error 1.24e-01 1.12e-01 9.44e-02 2.78e-01 2.51e-01 3.48e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 1.806 0.083 - - 1.95e-03 9.25e-05 67.180 57
CPL 1.400 0.350 73.7 57.5 3.11e-03 1.29e-03 62.860 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.071 0.379 - - 8.37e-03 2.06e-03 64.520 57
CPL -0.490 2.236 92.3 -32.1 4.08e-02 2.59e-01 62.100 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: 231.936000 sec.
T50 in the 50-300 keV band: 135.232000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 271.296 -3.300 267.996
T90 233.380 4.672 238.052
T50 139.708 31.524 171.232
Peak 1.000 8.408 9.408
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
157.5411 -51.7937 0.0094 44.0 -0.6 3.1928 20.4 TRIG_00551126
------------------------------------------
Foreground time interval of the image:
-3.300 60.005 (delta_t = 63.305 [sec])
Background time interval of the image:
-239.296 -3.300 (delta_t = 235.996 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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 -3.300 sec. to 267.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80607 ( -0.0823406 0.0832837 )
Norm@50keV : 1.94582E-03 ( -9.27224e-05 9.2367e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.18 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 57 degrees of freedom
# Null hypothesis probability = 1.675808e-01
Photon flux (15-150 keV) in 271.3 sec: 0.268763 ( -0.0130796 0.0131192 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.8589e-06 ( -2.35042e-07 2.35661e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.300 sec. to 267.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39962 ( -0.363567 0.335852 )
Epeak [keV] : 73.6943 ( -14.9462 100.049 )
Norm@50keV : 3.11438E-03 ( -0.000982276 0.00158871 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.86 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 56 degrees of freedom
# Null hypothesis probability = 2.463456e-01
Photon flux (15-150 keV) in 271.3 sec: 0.262252 ( -0.014038 0.0141 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.7261e-06 ( -2.61343e-07 2.60692e-07 ) ergs/cm2
Band function
Time interval is from -3.300 sec. to 267.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30118 ( -0.413951 1.0245 )
beta : -2.12124 ( 2.12152 0.287629 )
Epeak [keV] : 65.4262 ( -19.5613 85.4597 )
Norm@50keV : 3.55434E-03 ( -0.00136808 0.0165162 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.56 using 59 PHA bins.
# Reduced chi-squared = 1.137 for 55 degrees of freedom
# Null hypothesis probability = 2.256542e-01
Photon flux (15-150 keV) in 271.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.2938 ( )
R^2/D10^2 : 4.30779E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 162.81 using 59 PHA bins.
# Reduced chi-squared = 2.8564 for 57 degrees of freedom
# Null hypothesis probability = 4.027257e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.378e-07 3.432e-08
25- 50 1.544e-06 8.288e-08
50-150 1.748e-06 1.576e-07
15-150 3.730e-06 1.980e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 110.968 (-18.5112 22.4325)
Norm : 1.14351 (-0.0725651 0.0856063)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.12 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 57 degrees of freedom
# Null hypothesis probability = 2.689430e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.100e-07 6.810e-08
25- 50 1.429e-06 8.030e-08
50-150 2.451e-06 6.542e-07
15-150 4.690e-06 6.688e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.07468 (-1.14183 1.38404)
R1^2/D10^2 : 0.490003 (-0.246914 0.600552)
kT2 [keV] : 20.7030 (-2.75315 4.5087)
R2^2/D10^2 : 6.46518E-03 (-0.00356825 0.00522379)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.60 using 59 PHA bins.
# Reduced chi-squared = 1.265 for 55 degrees of freedom
# Null hypothesis probability = 8.896118e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.063e-07 1.415e-07
25- 50 1.407e-06 1.658e-07
50-150 2.388e-06 3.871e-07
15-150 4.602e-06 6.077e-07
Peak spectrum fit
Power-law model
Time interval is from 8.408 sec. to 9.408 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07137 ( -0.396111 0.36268 )
Norm@50keV : 8.36995E-03 ( -0.00207883 0.00204755 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.52 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 57 degrees of freedom
# Null hypothesis probability = 2.304967e-01
Photon flux (15-150 keV) in 1 sec: 0.968294 ( -0.246131 0.249805 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.83269e-08 ( -2.12677e-08 2.13541e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.408 sec. to 9.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.490326 ( -2.80263 1.66982 )
Epeak [keV] : 92.2703 ( -28.0839 -92.2569 )
Norm@50keV : 4.08146E-02 ( -0.0408335 0.477151 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.10 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 56 degrees of freedom
# Null hypothesis probability = 2.679479e-01
Photon flux (15-150 keV) in 1 sec: 0.926752 ( -0.248156 0.253588 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.45897e-08 ( -2.24223e-08 2.23333e-08 ) ergs/cm2
Band function
Time interval is from 8.408 sec. to 9.408 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97713 ( -14.8263 -4.97713 )
beta : -1.35236 ( -1.25533 0.481857 )
Epeak [keV] : 36.4258 ( -15.5684 19.0617 )
Norm@50keV : 73.7845 ( -16.8985 1758.36 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.64 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 55 degrees of freedom
# Null hypothesis probability = 2.507520e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.7760 (-4.61671 6.7966)
R^2/D10^2 : 4.36909E-02 (-0.0268763 0.0581887)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.60 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 57 degrees of freedom
# Null hypothesis probability = 2.843403e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.579e-09 1.730e-09
25- 50 1.827e-08 7.460e-09
50-150 5.874e-08 2.982e-08
15-150 8.059e-08 3.330e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 4.18051 (-1.03054 1.03033)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.60 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 57 degrees of freedom
# Null hypothesis probability = 1.395725e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.042e-08 6.425e-09
25- 50 2.004e-08 1.187e-08
50-150 4.395e-08 2.602e-08
15-150 7.442e-08 4.350e-08
Double BB
#Fit statistic : Chi-Squared = 61.95 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.93 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.91 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 55 degrees of freedom
# Reduced chi-squared = 1.127 for 55 degrees of freedom
# Reduced chi-squared = 1.126 for 55 degrees of freedom
# Reduced chi-squared = 1.126 for 55 degrees of freedom
# Reduced chi-squared = 1.126 for 55 degrees of freedom
# Null hypothesis probability = 2.396088e-01
# Null hypothesis probability = 2.416490e-01
# Null hypothesis probability = 2.420587e-01
# Null hypothesis probability = 2.427265e-01
# Null hypothesis probability = 2.432974e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.830e-09 3.756e-09
25- 50 1.929e-08 1.980e-08
50-150 6.067e-08 3.905e-08
15-150 8.479e-08 5.140e-08
Plot creation:
Sat Mar 16 07:51:21 EDT 2013