batgrbproduct Analysis for Trigger=521567
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 May 5 10:19:58 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger521567/GCN5_download_cron
======================================================================
Trigger: 00521567 Segment: 000
BAT Trigger Time: 357875088 [s; MET]
Trigger Stop: 357875408 [s; MET]
UTC: 2012-05-05T01:44:39.827060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 281.23396535837 Dec: -4.59137274041935 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.26
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.26
Flight Position: [ source = BAT ]
RA: 281.23396535837 Dec: -4.59137274041935 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 281.306764408642 Dec: -4.60208074377184 [deg; J2000]
{ 18h 45m 13.6s , -04d 36' 07.5" }
+/- 3.6087401294147 [arcmin] (estimated 90% radius based on SNR)
+/- 3.64653858439904 [arcmin] (formal 1-sigma fit error)
SNR: 4.86290831404815
Angular difference between Flight and Ground position is 4.401042 arcmin
Partial Coding Fraction: 0.3945312 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.884399 0.760672 0.192234 -0.070768
0.194706 0.172036 0.142579 0.122905 [error]
Peak 0.884399 0.760672 0.192234 -0.070768
0.194706 0.172036 0.142579 0.122905 [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 3.12e-07 3.20e-07 2.31e-07 2.67e-07 9.67e-07 1.13e-06 erg/cm2
Error 1.00e-07 8.99e-08 1.21e-07 3.15e-07 2.95e-07 4.52e-07 erg/cm2
Peak flux Power-law 3.21e-02 1.83e-02 6.62e-03 3.15e-03 5.88e-02 6.02e-02 ph/cm2/s
Error 1.05e-02 5.01e-03 3.36e-03 3.51e-03 1.51e-02 1.55e-02 ph/cm2/s
Fluence Cutoff-PL 2.92e-07 3.86e-07 1.29e-07 6.13e-09 8.13e-07 0.00e+00 erg/cm2
Error 1.12e-07 1.28e-07 1.63e-07 1.20e-07 4.36e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.94e-02 2.23e-02 4.04e-03 1.05e-04 5.58e-02 5.58e-02 ph/cm2/s
Error 1.18e-02 7.31e-03 4.68e-03 2.08e-03 1.54e-02 1.54e-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 2.470 0.532 - - 3.05e-04 1.19e-04 74.540 57
CPL 0.634 4.042 25.1 0.0 4.79e-03 0.00e+00 72.980 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.470 0.532 - - 3.05e-04 1.19e-04 74.540 57
CPL 0.634 4.042 25.1 0.0 4.79e-03 0.00e+00 72.980 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
281.3068 -4.6021 0.0393 39.4 -136.2 2.2969 4.9 TRIG_00521567
------------------------------------------
Foreground time interval of the image:
0.000 320.000 (delta_t = 320.000 [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
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.46950 ( -0.484607 0.579727 )
Norm@50keV : 3.04725E-04 ( -0.000119409 0.000118386 )
------------------------------------------------------------
# Chi-Squared = 74.54 using 59 PHA bins.
# Reduced chi-squared = 1.308 for 57 degrees of freedom
# Null hypothesis probability = 5.933700e-02
Photon flux (15-150 keV) in 320 sec: 5.87613E-02 ( -0.0151198 0.0151258 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.67296e-07 ( -2.86668e-07 3.04271e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.633556 ( -6.68834 1.39496 )
Epeak [keV] : 25.1207 ( )
Norm@50keV : 4.79347E-03 ( )
------------------------------------------------------------
# Chi-Squared = 72.98 using 59 PHA bins.
# Reduced chi-squared = 1.303 for 56 degrees of freedom
# Null hypothesis probability = 6.328327e-02
Photon flux (15-150 keV) in 320 sec: 5.57692E-02 ( -0.0152674 0.0155223 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.13366e-07 ( -2.4775e-07 6.24442e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.79519 ( -11.2894 -11.2894 )
beta : -3.10370 ( 3.10354 0.836705 )
Epeak [keV] : 24.5651 ( -24.5651 6.74667 )
Norm@50keV : 62.2674 ( -62.265 17.7198 )
------------------------------------------------------------
# Chi-Squared = 72.46 using 59 PHA bins.
# Reduced chi-squared = 1.317 for 55 degrees of freedom
# Null hypothesis probability = 5.738776e-02
Photon flux (15-150 keV) in 320 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] : 7.25393 (-1.64623 2.1382)
R^2/D10^2 : 9.82043E-02 (-0.0654481 0.195997)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 73.30 using 59 PHA bins.
# Reduced chi-squared = 1.286 for 57 degrees of freedom
# Null hypothesis probability = 7.178874e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.752e-07 1.474e-07
25- 50 4.035e-07 2.496e-07
50-150 7.593e-08 5.549e-08
15-150 7.547e-07 4.265e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 31.5896 (-13.468 30.5195)
Norm : 0.457196 (-0.19249 0.364308)
------------------------------------------------------------
# Chi-Squared = 73.24 using 59 PHA bins.
# Reduced chi-squared = 1.285 for 57 degrees of freedom
# Null hypothesis probability = 7.249715e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.054e-07 1.124e-07
25- 50 3.589e-07 1.511e-07
50-150 2.101e-07 1.586e-07
15-150 8.744e-07 3.600e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.46731 (-6.47137 2.54163)
R1^2/D10^2 : 0.143203 (-0.143027 -0.143027)
kT2 [keV] : 21.8957 (-21.9901 -21.9901)
R2^2/D10^2 : 3.37025E-04 (-0.00033213 0.245861)
------------------------------------------------------------
# Chi-Squared = 72.52 using 59 PHA bins.
# Reduced chi-squared = 1.319 for 55 degrees of freedom
# Null hypothesis probability = 5.675426e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.911e-07 1.699e-07
25- 50 3.796e-07 2.317e-07
50-150 2.217e-07 1.217e-07
15-150 8.924e-07 4.789e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.46950 ( -0.484607 0.579727 )
Norm@50keV : 3.04725E-04 ( -0.000119409 0.000118386 )
------------------------------------------------------------
# Chi-Squared = 74.54 using 59 PHA bins.
# Reduced chi-squared = 1.308 for 57 degrees of freedom
# Null hypothesis probability = 5.933700e-02
Photon flux (15-150 keV) in 320 sec: 5.87613E-02 ( -0.0151198 0.0151258 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.67296e-07 ( -2.86668e-07 3.04271e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.633556 ( -6.68834 1.39496 )
Epeak [keV] : 25.1207 ( )
Norm@50keV : 4.79347E-03 ( )
------------------------------------------------------------
# Chi-Squared = 72.98 using 59 PHA bins.
# Reduced chi-squared = 1.303 for 56 degrees of freedom
# Null hypothesis probability = 6.328327e-02
Photon flux (15-150 keV) in 320 sec: 5.57692E-02 ( -0.0152674 0.0155223 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.13366e-07 ( -2.4775e-07 6.24442e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.79519 ( -11.2894 -11.2894 )
beta : -3.10370 ( 3.10354 0.836705 )
Epeak [keV] : 24.5651 ( -24.5651 6.74667 )
Norm@50keV : 62.2674 ( -62.265 17.7198 )
------------------------------------------------------------
# Chi-Squared = 72.46 using 59 PHA bins.
# Reduced chi-squared = 1.317 for 55 degrees of freedom
# Null hypothesis probability = 5.738776e-02
Photon flux (15-150 keV) in 320 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] : 7.25393 (-1.64623 2.1382)
R^2/D10^2 : 9.82043E-02 (-0.0654481 0.195997)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 73.30 using 59 PHA bins.
# Reduced chi-squared = 1.286 for 57 degrees of freedom
# Null hypothesis probability = 7.178874e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.752e-07 1.669e-07
25- 50 4.035e-07 2.504e-07
50-150 7.593e-08 5.671e-08
15-150 7.547e-07 4.215e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 31.5896 (-13.468 30.5195)
Norm : 0.457196 (-0.19249 0.364308)
------------------------------------------------------------
# Chi-Squared = 73.24 using 59 PHA bins.
# Reduced chi-squared = 1.285 for 57 degrees of freedom
# Null hypothesis probability = 7.249715e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.054e-07 1.208e-07
25- 50 3.589e-07 1.742e-07
50-150 2.101e-07 1.589e-07
15-150 8.744e-07 3.901e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.46731 (-6.47137 2.54163)
R1^2/D10^2 : 0.143203 (-0.143027 -0.143027)
kT2 [keV] : 21.8957 (-21.9901 -21.9901)
R2^2/D10^2 : 3.37025E-04 (-0.00033213 0.245861)
------------------------------------------------------------
# Chi-Squared = 72.52 using 59 PHA bins.
# Reduced chi-squared = 1.319 for 55 degrees of freedom
# Null hypothesis probability = 5.675426e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.911e-07 1.742e-07
25- 50 3.796e-07 2.450e-07
50-150 2.217e-07 1.365e-07
15-150 8.924e-07 5.136e-07
Plot creation:
Sat May 5 10:38:03 EDT 2012