batgrbproduct Analysis for Trigger=524542
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): Mon Jun 18 05:25:47 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger524542/GCN5_download_cron
======================================================================
Trigger: 00524542 Segment: 000
BAT Trigger Time: 361640824 [s; MET]
Trigger Stop: 361640888 [s; MET]
UTC: 2012-06-17T15:46:55.671880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 282.785233371014 Dec: 0.0246607746816676 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.11
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.11
Flight Position: [ source = BAT ]
RA: 282.785233371014 Dec: 0.0246607746816676 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 282.797966273288 Dec: 0.000632021998642741 [deg; J2000]
{ 18h 51m 11.5s , +00d 00' 02.3" }
+/- 3.35055001873725 [arcmin] (estimated 90% radius based on SNR)
+/- 1.87845941850031 [arcmin] (formal 1-sigma fit error)
SNR: 5.4069520068637
Angular difference between Flight and Ground position is 1.631634 arcmin
Partial Coding Fraction: 1 [ 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 0.301693 0.245821 0.038437 0.003543
0.050939 0.047209 0.040179 0.037051 [error]
Peak 0.301693 0.245821 0.038437 0.003543
0.050939 0.047209 0.040179 0.037051 [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 8.10e-08 8.72e-08 6.67e-08 8.34e-08 2.67e-07 3.18e-07 erg/cm2
Error 2.12e-08 2.18e-08 3.00e-08 6.99e-08 7.45e-08 1.16e-07 erg/cm2
Peak flux Power-law 4.16e-02 2.49e-02 9.54e-03 4.87e-03 7.86e-02 8.09e-02 ph/cm2/s
Error 1.11e-02 6.07e-03 4.15e-03 3.80e-03 1.77e-02 1.85e-02 ph/cm2/s
Fluence Cutoff-PL 7.73e-08 1.17e-07 2.77e-08 3.80e-10 2.22e-07 0.00e+00 erg/cm2
Error 2.41e-08 3.12e-08 3.42e-08 6.54e-09 5.78e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.85e-02 3.38e-02 4.49e-03 3.37e-05 7.68e-02 7.67e-02 ph/cm2/s
Error 1.26e-02 8.73e-03 5.14e-03 5.13e-04 1.69e-02 1.69e-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 2.389 0.419 - - 4.28e-04 1.46e-04 49.830 57
CPL -0.982 3.248 28.8 5.9 7.53e-02 3.81e+01 42.600 56
The chi2 of BB fit is 42.67 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 2.389 0.419 - - 4.28e-04 1.46e-04 49.830 57
CPL -0.982 3.248 28.8 5.9 7.53e-02 3.81e+01 42.600 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
282.7980 +0.0006 0.0357 17.6 -172.0 0.5217 5.4 TRIG_00524542
------------------------------------------
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: 2.38895 ( -0.389472 0.449393 )
Norm@50keV : 4.27540E-04 ( -0.000143885 0.000147132 )
------------------------------------------------------------
# Chi-Squared = 49.83 using 59 PHA bins.
# Reduced chi-squared = 0.8742 for 57 degrees of freedom
# Null hypothesis probability = 7.384804e-01
Photon flux (15-150 keV) in 64 sec: 7.86066E-02 ( -0.0176868 0.0177262 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.66509e-07 ( -7.18182e-08 7.7168e-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: -0.981924 ( -4.22571 2.27004 )
Epeak [keV] : 28.8443 ( -4.87013 6.98637 )
Norm@50keV : 7.52615E-02 ( -0.0852632 76.1295 )
------------------------------------------------------------
# Chi-Squared = 42.60 using 59 PHA bins.
# Reduced chi-squared = 0.7606 for 56 degrees of freedom
# Null hypothesis probability = 9.066299e-01
Photon flux (15-150 keV) in 64 sec: 7.67571E-02 ( -0.0168123 0.0169436 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2229e-07 ( -5.38035e-08 6.17152e-08 ) 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 : 1.00563 ( -2.14611 -0.875341 )
beta : -9.99979 ( 15454.9 15464.9 )
Epeak [keV] : 28.8491 ( -9.13019 6.95053 )
Norm@50keV : 7.81489E-02 ( -0.0952722 21.9703 )
------------------------------------------------------------
# Chi-Squared = 42.59 using 59 PHA bins.
# Reduced chi-squared = 0.7744 for 55 degrees of freedom
# Null hypothesis probability = 8.889745e-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] : 7.48181 (-1.39413 1.67907)
R^2/D10^2 : 0.124089 (-0.070576 0.165116)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 42.67 using 59 PHA bins.
# Reduced chi-squared = 0.7486 for 57 degrees of freedom
# Null hypothesis probability = 9.208448e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.613e-08 3.066e-08
25- 50 1.182e-07 5.262e-08
50-150 2.478e-08 1.608e-08
15-150 2.191e-07 9.315e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.4026 (-11.5358 21.743)
Norm : 0.616073 (-0.210126 0.327568)
------------------------------------------------------------
# Chi-Squared = 45.50 using 59 PHA bins.
# Reduced chi-squared = 0.7983 for 57 degrees of freedom
# Null hypothesis probability = 8.633932e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.330e-08 2.838e-08
25- 50 9.919e-08 4.042e-08
50-150 5.995e-08 4.070e-08
15-150 2.424e-07 8.646e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.29215 (-5.30984 -5.30984)
R1^2/D10^2 : 0.154330 (-0.153935 -0.153935)
kT2 [keV] : 8.47617 (-8.55007 -8.55007)
R2^2/D10^2 : 5.57729E-02 (-0.0524914 0.231096)
------------------------------------------------------------
# Chi-Squared = 42.54 using 59 PHA bins.
# Reduced chi-squared = 0.7735 for 55 degrees of freedom
# Null hypothesis probability = 8.900478e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.823e-08 3.853e-07
25- 50 1.156e-07 1.756e-06
50-150 3.067e-08 6.157e-06
15-150 2.245e-07 4.922e-06
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: 2.38895 ( -0.389472 0.449393 )
Norm@50keV : 4.27540E-04 ( -0.000143885 0.000147132 )
------------------------------------------------------------
# Chi-Squared = 49.83 using 59 PHA bins.
# Reduced chi-squared = 0.8742 for 57 degrees of freedom
# Null hypothesis probability = 7.384804e-01
Photon flux (15-150 keV) in 64 sec: 7.86066E-02 ( -0.0176868 0.0177262 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.66509e-07 ( -7.18182e-08 7.7168e-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: -0.981924 ( -4.22571 2.27004 )
Epeak [keV] : 28.8443 ( -4.87013 6.9908 )
Norm@50keV : 7.52615E-02 ( -0.0852632 76.1295 )
------------------------------------------------------------
# Chi-Squared = 42.60 using 59 PHA bins.
# Reduced chi-squared = 0.7606 for 56 degrees of freedom
# Null hypothesis probability = 9.066299e-01
Photon flux (15-150 keV) in 64 sec: 7.67571E-02 ( -0.0168123 0.0169436 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2229e-07 ( -5.38035e-08 6.17152e-08 ) 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 : 1.00563 ( -2.14611 -0.875341 )
beta : -9.99979 ( 15454.9 15464.9 )
Epeak [keV] : 28.8491 ( -9.13019 6.95053 )
Norm@50keV : 7.81489E-02 ( -0.0952722 21.9626 )
------------------------------------------------------------
# Chi-Squared = 42.59 using 59 PHA bins.
# Reduced chi-squared = 0.7744 for 55 degrees of freedom
# Null hypothesis probability = 8.889745e-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] : 7.48181 (-1.39413 1.67907)
R^2/D10^2 : 0.124089 (-0.070576 0.165116)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 42.67 using 59 PHA bins.
# Reduced chi-squared = 0.7486 for 57 degrees of freedom
# Null hypothesis probability = 9.208448e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.613e-08 3.501e-08
25- 50 1.182e-07 5.070e-08
50-150 2.478e-08 1.613e-08
15-150 2.191e-07 9.856e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.4026 (-11.5358 21.743)
Norm : 0.616073 (-0.210126 0.327568)
------------------------------------------------------------
# Chi-Squared = 45.50 using 59 PHA bins.
# Reduced chi-squared = 0.7983 for 57 degrees of freedom
# Null hypothesis probability = 8.633932e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.330e-08 3.022e-08
25- 50 9.919e-08 3.738e-08
50-150 5.995e-08 4.117e-08
15-150 2.424e-07 1.005e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.29215 (-5.30984 -5.30984)
R1^2/D10^2 : 0.154330 (-0.153935 -0.153935)
kT2 [keV] : 8.47617 (-8.55007 -8.55007)
R2^2/D10^2 : 5.57729E-02 (-0.0524914 0.231096)
------------------------------------------------------------
# Chi-Squared = 42.54 using 59 PHA bins.
# Reduced chi-squared = 0.7735 for 55 degrees of freedom
# Null hypothesis probability = 8.900478e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.823e-08 6.365e-07
25- 50 1.156e-07 1.965e-06
50-150 3.067e-08 4.720e-06
15-150 2.245e-07 6.723e-06
Plot creation:
Mon Jun 18 05:44:19 EDT 2012