batgrbproduct Analysis for Trigger=458345
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): Fri Jul 29 14:48:42 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger458345/GCN5_download_cron
======================================================================
Trigger: 00458345 Segment: 000
BAT Trigger Time: 333631162.604 [s; MET]
Trigger Stop: 333631162.612 [s; MET]
UTC: 2011-07-29T11:19:15.398420 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 26.5984666273142 Dec: 61.7286773680504 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.7
Image Trigger?: NO
Rate S/N Ratio: 41.6293165929973 [ if not an image trigger ]
Image S/N Ratio: 9.7
Flight Position: [ source = BAT ]
RA: 26.5984666273142 Dec: 61.7286773680504 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 26.4154709320619 Dec: 61.6935203683584 [deg; J2000]
{ 01h 45m 39.7s , +61d 41' 36.7" }
+/- 4.53179441668947 [arcmin] (estimated 90% radius based on SNR)
+/- 2.99636512980901 [arcmin] (formal 1-sigma fit error)
SNR: 3.51228317121021
Angular difference between Flight and Ground position is 5.614799 arcmin
Partial Coding Fraction: 0.3242188 [ including projection effects ]
Duration
T90: 386.307999968529 +/- 187.073451325776
Measured from: 9.94800013303757
to: 396.256000101566 [s; relative to TRIGTIME]
T50: 79.4559999108315 +/- 166.286796823613
Measured from: 80.228000164032
to: 159.684000074863 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0679999589920044
to: 0.932000041007996 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 425.040000021458 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.407026 0.136350 0.137485 0.185807
0.128646 0.131212 0.115776 0.101517 [error]
Peak 0.028514 0.028210 0.016768 0.006623
0.011583 0.012590 0.010705 0.008767 [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 1.46e-07 1.12e-07 5.75e-08 4.25e-08 3.35e-07 3.58e-07 erg/cm2
Error 1.12e-07 9.53e-08 8.99e-08 1.93e-07 2.31e-07 3.42e-07 erg/cm2
Peak flux Power-law 3.63e-01 2.45e-01 1.08e-01 6.62e-02 7.49e-01 7.83e-01 ph/cm2/s
Error 2.01e-01 1.11e-01 7.62e-02 9.17e-02 3.33e-01 3.49e-01 ph/cm2/s
Fluence Cutoff-PL 1.46e-07 1.12e-07 5.76e-08 4.22e-08 3.36e-07 3.62e-07 erg/cm2
Error 1.12e-07 7.68e-08 8.95e-08 1.91e-07 2.31e-07 3.51e-07 erg/cm2
Peak flux Cutoff-PL 2.88e-01 3.22e-01 1.21e-01 5.13e-03 7.40e-01 7.41e-01 ph/cm2/s
Error 2.35e-01 1.56e-01 2.49e-01 3.32e-01 0.00e+00 0.00e+00 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 3.42e-01 3.46e-01 7.48e-01 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 2.28e-01 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 2.962 1.755 - - 6.68e-05 7.57e-05 63.740 57
CPL 1.878 0.000 5.1 0.0 2.73e-04 0.00e+00 64.370 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.176 0.801 - - 4.58e-03 2.61e-03 48.060 57
CPL -0.041 4.035 40.4 0.0 8.08e-02 0.00e+00 46.460 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 425.040 0.000 425.040
T90 386.308 9.948 396.256
T50 79.456 80.228 159.684
Peak 1.000 -0.068 0.932
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
26.4155 +61.6935 0.0548 46.7 -25.8 0.2101 3.5 TRIG_00458345
------------------------------------------
Foreground time interval of the image:
0.000 7.597 (delta_t = 7.597 [sec])
Background time interval of the image:
-115.103 0.000 (delta_t = 115.103 [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 0.000 sec. to 425.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.96153 ( -1.23173 2.27796 )
Norm@50keV : 6.68491E-05 ( -6.68165e-05 8.46063e-05 )
------------------------------------------------------------
# Chi-Squared = 63.74 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 57 degrees of freedom
# Null hypothesis probability = 2.514930e-01
Photon flux (15-150 keV) in 425 sec: 1.78781E-02 ( -0.00863411 0.00864014 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.35364e-07 ( -1.99019e-07 2.62253e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 425.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87792 ( )
Epeak [keV] : 5.05663 ( )
Norm@50keV : 2.73104E-04 ( )
------------------------------------------------------------
# Chi-Squared = 64.37 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 56 degrees of freedom
# Null hypothesis probability = 2.069810e-01
Photon flux (15-150 keV) in 425 sec: 1.78656E-02 ( -0.00862404 0.0085886 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36482e-07 ( -2.00446e-07 2.61225e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 425.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.83899 ( 6.75108 6.75108 )
beta : -2.96217 ( -2.27649 1.23159 )
Epeak [keV] : 8.52810 ( -8.5281 -8.5281 )
Norm@50keV : 9.08106E-03 ( -0.00908106 0.0114994 )
------------------------------------------------------------
# Chi-Squared = 63.74 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 55 degrees of freedom
# Null hypothesis probability = 1.961018e-01
Photon flux (15-150 keV) in 425 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] : 3.85785 (-1.44295 2.94102)
R^2/D10^2 : 0.517888 (-0.517915 7.16801)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 64.23 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 57 degrees of freedom
# Null hypothesis probability = 2.381975e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.675e-07 1.006e-07
25- 50 5.449e-08 3.808e-08
50-150 5.301e-10 7.121e-10
15-150 2.226e-07 1.500e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.1525 (-12.1795 135.613)
Norm : 0.399387 (-0.397263 4.37408)
------------------------------------------------------------
# Chi-Squared = 64.39 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 57 degrees of freedom
# Null hypothesis probability = 2.338281e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.557e-07 9.849e-08
25- 50 8.541e-08 5.395e-08
50-150 9.591e-09 1.156e-08
15-150 2.507e-07 1.703e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.49328 (-3.49078 2.21065)
R1^2/D10^2 : 0.784448 (-0.786547 28.3612)
kT2 [keV] : 20.7970 (-20.7564 -20.7564)
R2^2/D10^2 : 2.80609E-04 (-0.00028304 1.85348)
------------------------------------------------------------
# Chi-Squared = 62.28 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 55 degrees of freedom
# Null hypothesis probability = 2.331698e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.610e-07 1.013e-07
25- 50 8.642e-08 4.951e-08
50-150 1.612e-07 1.275e-07
15-150 4.086e-07 2.284e-07
Peak spectrum fit
Power-law model
Time interval is from -0.068 sec. to 0.932 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17621 ( -0.675173 0.926146 )
Norm@50keV : 4.58260E-03 ( -0.00265954 0.00255088 )
------------------------------------------------------------
# Chi-Squared = 48.06 using 59 PHA bins.
# Reduced chi-squared = 0.8432 for 57 degrees of freedom
# Null hypothesis probability = 7.944348e-01
Photon flux (15-150 keV) in 1 sec: 0.749336 ( -0.333016 0.333186 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.29159e-08 ( -2.12328e-08 2.26707e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.068 sec. to 0.932 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.08766E-02 ( -5.95258 2.11702 )
Epeak [keV] : 40.4260 ( )
Norm@50keV : 8.08043E-02 ( )
------------------------------------------------------------
# Chi-Squared = 46.46 using 59 PHA bins.
# Reduced chi-squared = 0.8297 for 56 degrees of freedom
# Null hypothesis probability = 8.143732e-01
Photon flux (15-150 keV) in 1 sec: 0.740037 ( -0.329633 0.168271 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.12855e-08 ( -1.81479e-08 2.13964e-08 ) ergs/cm2
Band function
Time interval is from -0.068 sec. to 0.932 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.12754E-02 ( 0.649841 0.649841 )
beta : -10.00000 ( 9.64595e+07 9.64595e+07 )
Epeak [keV] : 40.4149 ( -31.7585 -40.5503 )
Norm@50keV : 8.08388E-02 ( -0.0799662 32.1968 )
------------------------------------------------------------
# Chi-Squared = 46.46 using 59 PHA bins.
# Reduced chi-squared = 0.8448 for 55 degrees of freedom
# Null hypothesis probability = 7.869235e-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] : 10.8559 (-4.2472 5.32875)
R^2/D10^2 : 0.285301 (-0.285271 1.5474)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 46.81 using 59 PHA bins.
# Reduced chi-squared = 0.8213 for 57 degrees of freedom
# Null hypothesis probability = 8.300006e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.006e-09 4.733e-09
25- 50 1.948e-08 1.196e-08
50-150 1.283e-08 1.056e-08
15-150 3.931e-08 2.671e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 52.2481 (-31.4235 142.496)
Norm : 4.35964 (-2.26306 4.60509)
------------------------------------------------------------
# Chi-Squared = 46.96 using 59 PHA bins.
# Reduced chi-squared = 0.8238 for 57 degrees of freedom
# Null hypothesis probability = 8.260551e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.076e-08 7.340e-09
25- 50 1.570e-08 1.045e-08
50-150 1.588e-08 1.302e-08
15-150 4.234e-08 3.015e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.06910 (-4.29528 41.8175)
R1^2/D10^2 : 5.24843 (-4.80526 -4.80526)
kT2 [keV] : 12.6274 (-12.8906 -12.8906)
R2^2/D10^2 : 0.134894 (-0.123381 1.20689)
------------------------------------------------------------
# Chi-Squared = 46.14 using 59 PHA bins.
# Reduced chi-squared = 0.8389 for 55 degrees of freedom
# Null hypothesis probability = 7.968806e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.745e-09 4.630e-09
25- 50 1.718e-08 1.064e-08
50-150 1.510e-08 1.148e-08
15-150 4.203e-08 2.722e-08
Plot creation:
Fri Jul 29 15:06:31 EDT 2011