batgrbproduct Analysis for Trigger=526892
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): Tue Jul 17 14:14:39 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger526892/GCN5_download_cron
======================================================================
Trigger: 00526892 Segment: 000
BAT Trigger Time: 364165200 [s; MET]
Trigger Stop: 364165264 [s; MET]
UTC: 2012-07-16T20:59:50.566780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.002236549871 Dec: -24.7485899798734 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.01
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.01
Flight Position: [ source = BAT ]
RA: 267.002236549871 Dec: -24.7485899798734 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.980363491232 Dec: -24.7777664045683 [deg; J2000]
{ 17h 47m 55.3s , -24d 46' 40.0" }
+/- 3.89255193589458 [arcmin] (estimated 90% radius based on SNR)
+/- 2.25212990793914 [arcmin] (formal 1-sigma fit error)
SNR: 4.36441819260882
Angular difference between Flight and Ground position is 2.117714 arcmin
Partial Coding Fraction: 0.9921875 [ 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 0.219863 0.190183 0.031244 -0.026560
0.050432 0.045642 0.037914 0.032539 [error]
Peak 0.219863 0.190183 0.031244 -0.026560
0.050432 0.045642 0.037914 0.032539 [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 5.70e-08 6.47e-08 5.26e-08 7.15e-08 2.00e-07 2.46e-07 erg/cm2
Error 2.08e-08 2.09e-08 3.02e-08 9.07e-08 7.36e-08 1.24e-07 erg/cm2
Peak flux Power-law 2.92e-02 1.84e-02 7.49e-03 4.13e-03 5.72e-02 5.92e-02 ph/cm2/s
Error 1.09e-02 5.82e-03 4.16e-03 4.92e-03 1.72e-02 1.79e-02 ph/cm2/s
Fluence Cutoff-PL 5.43e-08 8.09e-08 2.81e-08 1.19e-09 1.65e-07 0.00e+00 erg/cm2
Error 2.32e-08 2.91e-08 3.78e-08 2.79e-08 9.78e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.72e-02 2.32e-02 4.41e-03 1.02e-04 5.49e-02 5.49e-02 ph/cm2/s
Error 1.20e-02 8.27e-03 5.43e-03 2.88e-03 1.68e-02 1.68e-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 2.73e-02 5.57e-02 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 2.297 0.577 - - 3.28e-04 1.42e-04 58.420 57
CPL 0.087 4.815 29.1 18.9 9.23e-03 2.77e+03 56.250 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.297 0.577 - - 3.28e-04 1.42e-04 58.420 57
CPL 0.087 4.815 29.1 18.9 9.23e-03 2.77e+03 56.250 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
266.9804 -24.7778 0.0441 17.8 -154.8 0.4115 4.4 TRIG_00526892
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.29697 ( -0.526583 0.626592 )
Norm@50keV : 3.28000E-04 ( -0.00014133 0.000141838 )
------------------------------------------------------------
# Chi-Squared = 58.42 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 57 degrees of freedom
# Null hypothesis probability = 4.231114e-01
Photon flux (15-150 keV) in 64 sec: 5.72235E-02 ( -0.0171543 0.0171586 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00421e-07 ( -7.04838e-08 7.68115e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 8.73019E-02 ( -7.66456 1.96475 )
Epeak [keV] : 29.1024 ( -18.0623 19.7015 )
Norm@50keV : 9.22711E-03 ( -0.0110094 5538.86 )
------------------------------------------------------------
# Chi-Squared = 56.25 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 56 degrees of freedom
# Null hypothesis probability = 4.653258e-01
Photon flux (15-150 keV) in 64 sec: 5.48847E-02 ( -0.0165942 0.0169213 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64602e-07 ( -5.75974e-08 1.3796e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.09141E-02 ( 0.074022 0.074022 )
beta : -9.99999 ( 216323 216333 )
Epeak [keV] : 29.2085 ( -26.4763 19.3838 )
Norm@50keV : 1.14614E-02 ( -0.017193 18.428 )
------------------------------------------------------------
# Chi-Squared = 56.24 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 55 degrees of freedom
# Null hypothesis probability = 4.283535e-01
Photon flux (15-150 keV) in 64 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] : 7.57210 (-2.00091 2.77225)
R^2/D10^2 : 8.27649E-02 (-0.0827763 0.211041)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 56.50 using 59 PHA bins.
# Reduced chi-squared = 0.9912 for 57 degrees of freedom
# Null hypothesis probability = 4.938488e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.256e-08 2.796e-08
25- 50 8.342e-08 5.050e-08
50-150 1.822e-08 1.424e-08
15-150 1.542e-07 9.200e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.9259 (-17.7323 50.0914)
Norm : 0.400750 (-0.173515 0.336097)
------------------------------------------------------------
# Chi-Squared = 56.84 using 59 PHA bins.
# Reduced chi-squared = 0.9972 for 57 degrees of freedom
# Null hypothesis probability = 4.810121e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.723e-08 2.900e-08
25- 50 7.265e-08 4.407e-08
50-150 5.138e-08 4.009e-08
15-150 1.813e-07 1.111e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 14.5205 ( )
R1^2/D10^2 : 2.42279E-03 (-0.00255272 0.24956)
kT2 [keV] : 6.06065 (-5.99118 -5.99118)
R2^2/D10^2 : 0.156486 (-0.159414 -0.159414)
------------------------------------------------------------
# Chi-Squared = 56.01 using 59 PHA bins.
# Chi-Squared = 55.91 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 55 degrees of freedom
# Reduced chi-squared = 1.017 for 55 degrees of freedom
# Null hypothesis probability = 4.369006e-01
# Null hypothesis probability = 4.405386e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.647e-08 4.029e-08
25- 50 7.827e-08 5.482e-08
50-150 3.390e-08 2.417e-08
15-150 1.686e-07 1.091e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.29697 ( -0.526583 0.626592 )
Norm@50keV : 3.28000E-04 ( -0.00014133 0.000141838 )
------------------------------------------------------------
# Chi-Squared = 58.42 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 57 degrees of freedom
# Null hypothesis probability = 4.231114e-01
Photon flux (15-150 keV) in 64 sec: 5.72235E-02 ( -0.0171543 0.0171586 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00421e-07 ( -7.04838e-08 7.68115e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 8.73019E-02 ( -7.66456 1.96475 )
Epeak [keV] : 29.1024 ( -18.0623 19.7015 )
Norm@50keV : 9.22711E-03 ( -0.0110094 5538.86 )
------------------------------------------------------------
# Chi-Squared = 56.25 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 56 degrees of freedom
# Null hypothesis probability = 4.653258e-01
Photon flux (15-150 keV) in 64 sec: 5.48847E-02 ( -0.0165942 0.0169213 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64602e-07 ( -5.75974e-08 1.3796e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.09141E-02 ( 0.074022 0.074022 )
beta : -9.99999 ( 216323 216333 )
Epeak [keV] : 29.2085 ( -26.5274 19.3806 )
Norm@50keV : 1.14614E-02 ( -0.017193 18.4232 )
------------------------------------------------------------
# Chi-Squared = 56.24 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 55 degrees of freedom
# Null hypothesis probability = 4.283535e-01
Photon flux (15-150 keV) in 64 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] : 7.57210 (-2.00091 2.77225)
R^2/D10^2 : 8.27649E-02 (-0.0827763 0.211041)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 56.50 using 59 PHA bins.
# Reduced chi-squared = 0.9912 for 57 degrees of freedom
# Null hypothesis probability = 4.938488e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.256e-08 3.113e-08
25- 50 8.342e-08 5.290e-08
50-150 1.822e-08 1.376e-08
15-150 1.542e-07 9.533e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.9259 (-17.7323 50.0914)
Norm : 0.400750 (-0.173515 0.336097)
------------------------------------------------------------
# Chi-Squared = 56.84 using 59 PHA bins.
# Reduced chi-squared = 0.9972 for 57 degrees of freedom
# Null hypothesis probability = 4.810121e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.723e-08 2.860e-08
25- 50 7.265e-08 4.011e-08
50-150 5.138e-08 4.198e-08
15-150 1.813e-07 1.042e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 14.5205 ( )
R1^2/D10^2 : 2.42279E-03 (-0.00255272 0.24956)
kT2 [keV] : 6.06065 (-5.99118 -5.99118)
R2^2/D10^2 : 0.156486 (-0.159414 -0.159414)
------------------------------------------------------------
# Chi-Squared = 56.01 using 59 PHA bins.
# Chi-Squared = 55.91 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 55 degrees of freedom
# Reduced chi-squared = 1.017 for 55 degrees of freedom
# Null hypothesis probability = 4.369006e-01
# Null hypothesis probability = 4.405386e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.647e-08 3.760e-08
25- 50 7.827e-08 5.754e-08
50-150 3.390e-08 2.473e-08
15-150 1.686e-07 1.190e-07
Plot creation:
Tue Jul 17 14:23:19 EDT 2012