batgrbproduct Analysis for Trigger=552142
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): Thu Mar 28 20:23:53 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger552142/GCN5_download_cron
======================================================================
Trigger: 00552142 Segment: 000
BAT Trigger Time: 386129648 [s; MET]
Trigger Stop: 386129712 [s; MET]
UTC: 2013-03-28T02:13:57.626700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 270.747131670602 Dec: 21.327205081268 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.08
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.08
Flight Position: [ source = BAT ]
RA: 270.747131670602 Dec: 21.327205081268 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 270.81256045641 Dec: 21.3688855995782 [deg; J2000]
{ 18h 03m 15.0s , +21d 22' 08.0" }
+/- 3.55644705886345 [arcmin] (estimated 90% radius based on SNR)
+/- 1.84830066303713 [arcmin] (formal 1-sigma fit error)
SNR: 4.96537631475907
Angular difference between Flight and Ground position is 4.429806 arcmin
Partial Coding Fraction: 0.796875 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.231156 0.255999 -0.054423 -0.005346
0.051373 0.049581 0.041498 0.035751 [error]
Peak 0.231156 0.255999 -0.054423 -0.005346
0.051373 0.049581 0.041498 0.035751 [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 7.75e-08 6.85e-08 4.16e-08 3.82e-08 2.04e-07 2.25e-07 erg/cm2
Error 2.26e-08 2.34e-08 2.68e-08 5.12e-08 7.09e-08 9.63e-08 erg/cm2
Peak flux Power-law 4.10e-02 2.03e-02 6.16e-03 2.37e-03 6.88e-02 6.99e-02 ph/cm2/s
Error 1.22e-02 6.69e-03 3.85e-03 3.00e-03 1.88e-02 1.92e-02 ph/cm2/s
Fluence Cutoff-PL 7.64e-08 9.54e-08 5.26e-09 8.83e-13 1.77e-07 1.77e-07 erg/cm2
Error 2.65e-08 3.57e-08 1.38e-08 4.32e-10 4.93e-08 4.93e-08 erg/cm2
Peak flux Cutoff-PL 3.84e-02 2.95e-02 9.38e-04 8.38e-08 6.89e-02 6.89e-02 ph/cm2/s
Error 1.41e-02 1.02e-02 2.26e-03 3.83e-05 1.77e-02 1.77e-02 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 2.714 0.575 - - 3.05e-04 1.49e-04 64.190 57
CPL -4.588 0.185 26.4 4.9 3.96e+01 0.00e+00 56.040 56
The chi2 of BB fit is 56.76 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.714 0.575 - - 3.05e-04 1.49e-04 64.190 57
CPL -4.588 0.185 26.4 4.9 3.96e+01 0.00e+00 56.040 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
270.8126 +21.3689 0.0389 22.5 147.9 0.4778 5.0 TRIG_00552142
------------------------------------------
Foreground time interval of the image:
0.000 36.560 (delta_t = 36.560 [sec])
38.000 64.000 (delta_t = 26.000 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
0.000000 36.560000
38.000000 64.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.71438 ( -0.513556 0.636908 )
Norm@50keV : 3.05372E-04 ( -0.000142846 0.000155224 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.19 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 57 degrees of freedom
# Null hypothesis probability = 2.392309e-01
Photon flux (15-150 keV) in 62.56 sec: 6.87781E-02 ( -0.0187014 0.0188464 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03838e-07 ( -6.70374e-08 7.47567e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 36.560000
38.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.58766 ( 3.27152 3.64157 )
Epeak [keV] : 26.3569 ( -5.01934 4.82587 )
Norm@50keV : 39.5723 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.04 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 56 degrees of freedom
# Null hypothesis probability = 4.733683e-01
Photon flux (15-150 keV) in 62.56 sec: 6.88812E-02 ( -0.0176396 0.0177343 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77075e-07 ( -4.77377e-08 5.07681e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 36.560000
38.000000 64.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.48264 ( -4.46907 -4.48264 )
beta : -9.37167 ( 9.37167 19.303 )
Epeak [keV] : 26.2998 ( -4.00315 4.54606 )
Norm@50keV : 33.8315 ( -8.24515 189.781 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.04 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 55 degrees of freedom
# Null hypothesis probability = 4.355285e-01
Photon flux (15-150 keV) in 62.56 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] : 6.44645 (-1.23738 1.46665)
R^2/D10^2 : 0.209495 (-0.123495 0.309951)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.76 using 59 PHA bins.
# Reduced chi-squared = 0.9957 for 57 degrees of freedom
# Null hypothesis probability = 4.841735e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.966e-08 4.654e-08
25- 50 9.251e-08 5.295e-08
50-150 1.127e-08 9.359e-09
15-150 1.834e-07 9.754e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 22.6595 (-8.36633 15.6857)
Norm : 0.759132 (-0.318986 0.591406)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.54 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.493144e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.128e-08 3.097e-08
25- 50 7.801e-08 4.078e-08
50-150 2.859e-08 2.437e-08
15-150 1.879e-07 9.120e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.809897 (-6.43068 72.6382)
R1^2/D10^2 : 7.00231E+04 ( )
kT2 [keV] : 6.46412 (-1.25238 1.58082)
R2^2/D10^2 : 0.206307 (-0.119783 0.311948)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.76 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.74 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Null hypothesis probability = 4.093533e-01
# Null hypothesis probability = 4.098853e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.966e-08 1.044e+00
25- 50 9.251e-08 9.009e+00
50-150 1.127e-08 2.270e+02
15-150 1.834e-07 2.066e+02
Peak spectrum fit
Power-law model
Time interval is from 38.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.71438 ( -0.513556 0.636908 )
Norm@50keV : 3.05372E-04 ( -0.000142846 0.000155224 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.19 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 57 degrees of freedom
# Null hypothesis probability = 2.392309e-01
Photon flux (15-150 keV) in 62.56 sec: 6.87781E-02 ( -0.0187014 0.0188464 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03838e-07 ( -6.70374e-08 7.47567e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 38.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.58766 ( 3.27152 3.64157 )
Epeak [keV] : 26.3569 ( -5.01934 4.82587 )
Norm@50keV : 39.5723 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.04 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 56 degrees of freedom
# Null hypothesis probability = 4.733683e-01
Photon flux (15-150 keV) in 62.56 sec: 6.88812E-02 ( -0.0176396 0.0177343 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77075e-07 ( -4.77377e-08 5.07681e-08 ) ergs/cm2
Band function
Time interval is from 38.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.48264 ( -4.46907 -4.48264 )
beta : -9.37167 ( 9.37167 19.303 )
Epeak [keV] : 26.2998 ( -4.00315 4.54606 )
Norm@50keV : 33.8315 ( -8.24515 189.781 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.04 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 55 degrees of freedom
# Null hypothesis probability = 4.355285e-01
Photon flux (15-150 keV) in 62.56 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] : 6.44645 (-1.23738 1.46665)
R^2/D10^2 : 0.209495 (-0.123495 0.309951)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.76 using 59 PHA bins.
# Reduced chi-squared = 0.9957 for 57 degrees of freedom
# Null hypothesis probability = 4.841735e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.966e-08 4.121e-08
25- 50 9.251e-08 5.824e-08
50-150 1.127e-08 9.097e-09
15-150 1.834e-07 1.117e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 22.6595 (-8.36633 15.6857)
Norm : 0.759132 (-0.318986 0.591406)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.54 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.493144e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.128e-08 3.726e-08
25- 50 7.801e-08 4.614e-08
50-150 2.859e-08 2.366e-08
15-150 1.879e-07 8.795e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.809897 (-6.43068 72.6382)
R1^2/D10^2 : 7.00231E+04 ( )
kT2 [keV] : 6.46412 (-1.25238 1.58082)
R2^2/D10^2 : 0.206307 (-0.119783 0.311948)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.76 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.74 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Null hypothesis probability = 4.093533e-01
# Null hypothesis probability = 4.098853e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.966e-08 1.067e+00
25- 50 9.251e-08 8.727e+00
50-150 1.127e-08 2.457e+02
15-150 1.834e-07 2.168e+02
Plot creation:
Thu Mar 28 20:51:10 EDT 2013