batgrbproduct Analysis for Trigger=512164
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 Jan 21 13:52:37 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger512164/GCN5_download_cron
======================================================================
Trigger: 00512164 Segment: 000
BAT Trigger Time: 348831747.072 [s; MET]
Trigger Stop: 348831751.168 [s; MET]
UTC: 2012-01-21T09:42:19.266000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 249.336314295725 Dec: -23.9543948122384 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.97
Image Trigger?: NO
Rate S/N Ratio: 8.94427190999916 [ if not an image trigger ]
Image S/N Ratio: 9.97
Flight Position: [ source = BAT ]
RA: 249.336314295725 Dec: -23.9543948122384 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 249.36297074294 Dec: -23.9627544994094 [deg; J2000]
{ 16h 37m 27.1s , -23d 57' 45.9" }
+/- 1.36175744036078 [arcmin] (estimated 90% radius based on SNR)
+/- 0.417265966447144 [arcmin] (formal 1-sigma fit error)
SNR: 19.568038707806
Angular difference between Flight and Ground position is 1.545253 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 26.0879999399185 +/- 3.10419390482241
Measured from: -9.66799992322922
to: 16.4200000166893 [s; relative to TRIGTIME]
T50: 12.4519999623299 +/- 2.50281119983728
Measured from: -4.2279999256134
to: 8.22400003671646 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.85999995470047
to: 3.85999995470047 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.0040000081062
to: 18.3279999494553 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.290826 0.558680 0.554561 0.143289
0.044043 0.041415 0.035667 0.029584 [error]
Peak 0.019239 0.032257 0.031947 0.010023
0.008112 0.007661 0.006575 0.005447 [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 1.09e-07 2.36e-07 4.03e-07 1.58e-06 1.10e-06 2.33e-06 erg/cm2
Error 1.65e-08 2.15e-08 3.42e-08 3.04e-07 8.76e-08 3.21e-07 erg/cm2
Peak flux Power-law 2.25e-01 2.41e-01 1.83e-01 2.26e-01 7.34e-01 8.75e-01 ph/cm2/s
Error 1.00e-01 6.76e-02 5.15e-02 1.31e-01 1.89e-01 2.15e-01 ph/cm2/s
Fluence Cutoff-PL 9.00e-08 2.47e-07 4.32e-07 6.73e-07 1.06e-06 1.44e-06 erg/cm2
Error 2.09e-08 2.43e-08 4.14e-08 4.23e-07 9.45e-08 4.26e-07 erg/cm2
Peak flux Cutoff-PL 1.64e-01 2.59e-01 2.07e-01 8.20e-02 6.88e-01 7.12e-01 ph/cm2/s
Error 1.21e-01 8.11e-02 6.48e-02 2.15e-01 2.00e-01 2.60e-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 7.59e-01 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 1.231 0.132 - - 3.74e-03 2.83e-04 61.370 57
CPL 0.475 0.606 114.2 90.1 8.14e-03 5.37e-03 55.850 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.398 0.411 - - 6.03e-03 1.47e-03 39.980 57
CPL 0.073 1.584 78.9 -28.1 2.49e-02 2.29e-01 38.400 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: 24.000000 sec.
T50 in the 50-300 keV band: 12.992000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 29.332 -11.004 18.328
T90 26.088 -9.668 16.420
T50 12.452 -4.228 8.224
Peak 1.000 2.860 3.860
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
249.3630 -23.9628 0.0098 33.0 -26.1 1.5746 19.6 TRIG_00512164
------------------------------------------
Foreground time interval of the image:
-11.004 18.328 (delta_t = 29.332 [sec])
Background time interval of the image:
-239.072 -11.004 (delta_t = 228.068 [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 -11.004 sec. to 18.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23100 ( -0.132747 0.130568 )
Norm@50keV : 3.74253E-03 ( -0.000283338 0.000283003 )
------------------------------------------------------------
# Chi-Squared = 61.37 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 57 degrees of freedom
# Null hypothesis probability = 3.222922e-01
Photon flux (15-150 keV) in 29.33 sec: 0.441308 ( -0.0355733 0.0357405 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10415e-06 ( -8.74254e-08 8.77099e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.004 sec. to 18.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.474709 ( -0.65062 0.561473 )
Epeak [keV] : 114.241 ( -28.7471 151.36 )
Norm@50keV : 8.13552E-03 ( -0.00349527 0.00723797 )
------------------------------------------------------------
# Chi-Squared = 55.85 using 59 PHA bins.
# Reduced chi-squared = 0.9973 for 56 degrees of freedom
# Null hypothesis probability = 4.804751e-01
Photon flux (15-150 keV) in 29.33 sec: 0.423390 ( -0.037893 0.03803 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06173e-06 ( -9.46714e-08 9.42402e-08 ) ergs/cm2
Band function
Time interval is from -11.004 sec. to 18.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.433057 ( -0.480334 0.621876 )
beta : -9.37167 ( 9.99999 20 )
Epeak [keV] : 112.038 ( -19.4321 131.059 )
Norm@50keV : 8.43020E-03 ( -0.00377309 0.00578395 )
------------------------------------------------------------
# Chi-Squared = 55.87 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 55 degrees of freedom
# Null hypothesis probability = 4.421194e-01
Photon flux (15-150 keV) in 29.33 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] : 19.5160 (-1.74023 1.97627)
R^2/D10^2 : 2.19167E-02 (-0.00608932 0.00817598)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 73.17 using 59 PHA bins.
# Reduced chi-squared = 1.284 for 57 degrees of freedom
# Null hypothesis probability = 7.325577e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.765e-08 8.374e-09
25- 50 2.335e-07 2.861e-08
50-150 6.567e-07 8.447e-08
15-150 9.379e-07 8.506e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.996 ( )
Norm : 1.88058 (-1.88058 -1.88058)
------------------------------------------------------------
# Chi-Squared = 76.17 using 59 PHA bins.
# Reduced chi-squared = 1.336 for 57 degrees of freedom
# Null hypothesis probability = 4.581930e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.374e-07 7.189e-08
25- 50 2.642e-07 1.375e-07
50-150 5.795e-07 3.003e-07
15-150 9.811e-07 5.144e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.44416 (-2.77525 4.11323)
R1^2/D10^2 : 0.235036 (-0.165798 0.982155)
kT2 [keV] : 25.6696 (-4.36676 11.0682)
R2^2/D10^2 : 7.57922E-03 (-0.00561167 0.00762298)
------------------------------------------------------------
# Chi-Squared = 55.75 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 55 degrees of freedom
# Null hypothesis probability = 4.465079e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.022e-08 4.459e-08
25- 50 2.444e-07 9.984e-08
50-150 7.224e-07 2.813e-07
15-150 1.057e-06 4.256e-07
Peak spectrum fit
Power-law model
Time interval is from 2.860 sec. to 3.860 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39762 ( -0.414303 0.408544 )
Norm@50keV : 6.03457E-03 ( -0.00147569 0.00147377 )
------------------------------------------------------------
# Chi-Squared = 39.98 using 59 PHA bins.
# Reduced chi-squared = 0.7015 for 57 degrees of freedom
# Null hypothesis probability = 9.575814e-01
Photon flux (15-150 keV) in 1 sec: 0.734483 ( -0.188127 0.190202 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.83397e-08 ( -1.50636e-08 1.52554e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.860 sec. to 3.860 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 7.31765E-02 ( -1.66363 1.5035 )
Epeak [keV] : 78.8625 ( -22.6243 -78.8625 )
Norm@50keV : 2.48841E-02 ( -0.0248841 0.432371 )
------------------------------------------------------------
# Chi-Squared = 38.40 using 59 PHA bins.
# Reduced chi-squared = 0.6857 for 56 degrees of freedom
# Null hypothesis probability = 9.651215e-01
Photon flux (15-150 keV) in 1 sec: 0.688435 ( -0.200101 0.200581 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.46088e-08 ( -1.57748e-08 1.62233e-08 ) ergs/cm2
Band function
Time interval is from 2.860 sec. to 3.860 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.29968E-02 ( -1.39866 2.65798 )
beta : -10.00000 ( 7.79883e+08 7.79883e+08 )
Epeak [keV] : 78.8469 ( -25.9093 -78.8477 )
Norm@50keV : 2.48909E-02 ( -0.0248896 0.433758 )
------------------------------------------------------------
# Chi-Squared = 38.40 using 59 PHA bins.
# Reduced chi-squared = 0.6982 for 55 degrees of freedom
# Null hypothesis probability = 9.565732e-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] : 17.2757 (-4.11749 5.79433)
R^2/D10^2 : 5.41832E-02 (-0.0344992 0.0864517)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 39.38 using 59 PHA bins.
# Reduced chi-squared = 0.6909 for 57 degrees of freedom
# Null hypothesis probability = 9.636927e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.278e-09 1.713e-09
25- 50 1.469e-08 6.310e-09
50-150 3.146e-08 1.967e-08
15-150 4.943e-08 2.204e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-107.653 -199.999)
Norm : 3.08657 (-0.752001 0.752077)
------------------------------------------------------------
# Chi-Squared = 39.80 using 59 PHA bins.
# Reduced chi-squared = 0.6982 for 57 degrees of freedom
# Null hypothesis probability = 9.595357e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.686e-09 4.395e-09
25- 50 1.478e-08 8.510e-09
50-150 3.243e-08 1.830e-08
15-150 5.490e-08 3.114e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.40073 (-4.40118 55.1193)
R1^2/D10^2 : 2.40530 (-2.40423 -2.40423)
kT2 [keV] : 19.3485 (-5.31923 -19.3487)
R2^2/D10^2 : 3.43739E-02 (-0.0343723 0.0750777)
------------------------------------------------------------
# Chi-Squared = 38.15 using 59 PHA bins.
# Reduced chi-squared = 0.6936 for 55 degrees of freedom
# Null hypothesis probability = 9.593504e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.923e-09 3.671e-09
25- 50 1.384e-08 7.845e-09
50-150 3.382e-08 2.011e-08
15-150 5.359e-08 2.928e-08
Plot creation:
Sat Jan 21 14:09:06 EST 2012