batgrbproduct Analysis for Trigger=525261
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): Thu Jun 28 13:17:22 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger525261/GCN5_download_cron
======================================================================
Trigger: 00525261 Segment: 000
BAT Trigger Time: 362533512 [s; MET]
Trigger Stop: 362533576 [s; MET]
UTC: 2012-06-27T23:45:03.634860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 128.947365097609 Dec: -43.1965665717601 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.11
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.11
Flight Position: [ source = BAT ]
RA: 128.947365097609 Dec: -43.1965665717601 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 129.064366374227 Dec: -43.202587094644 [deg; J2000]
{ 08h 36m 15.4s , -43d 12' 09.3" }
+/- 4.14322440720572 [arcmin] (estimated 90% radius based on SNR)
+/- 2.3781692375661 [arcmin] (formal 1-sigma fit error)
SNR: 3.99214492991149
Angular difference between Flight and Ground position is 5.130184 arcmin
Partial Coding Fraction: 0.734375 [ 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 0.276175 0.251698 -0.007933 -0.101512
0.050316 0.051177 0.044336 0.039326 [error]
Peak 0.276175 0.251698 -0.007933 -0.101512
0.050316 0.051177 0.044336 0.039326 [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 7.83e-08 7.43e-08 4.89e-08 5.00e-08 2.22e-07 2.53e-07 erg/cm2
Error 2.10e-08 2.32e-08 2.82e-08 6.05e-08 7.34e-08 1.04e-07 erg/cm2
Peak flux Power-law 4.04e-02 2.14e-02 7.05e-03 3.00e-03 7.05e-02 7.20e-02 ph/cm2/s
Error 1.10e-02 6.46e-03 3.94e-03 3.44e-03 1.80e-02 1.86e-02 ph/cm2/s
Fluence Cutoff-PL 7.80e-08 1.08e-07 1.08e-08 1.18e-11 1.96e-07 0.00e+00 erg/cm2
Error 2.50e-08 3.56e-08 1.96e-08 1.04e-09 5.11e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.85e-02 3.19e-02 1.85e-03 1.08e-06 7.22e-02 7.23e-02 ph/cm2/s
Error 1.30e-02 9.96e-03 3.07e-03 8.88e-05 1.67e-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 7.24e-02 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 2.610 0.504 - - 3.35e-04 1.48e-04 65.000 57
CPL -3.744 4.612 27.4 5.7 8.06e+00 0.00e+00 56.030 56
The chi2 of BB fit is 56.31 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 2.610 0.504 - - 3.35e-04 1.48e-04 65.000 57
CPL -3.744 4.612 27.4 5.7 8.06e+00 0.00e+00 56.030 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
129.0644 -43.2026 0.0482 19.0 60.4 0.3905 4.0 TRIG_00525261
------------------------------------------
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: 2.61003 ( -0.446254 0.562563 )
Norm@50keV : 3.34733E-04 ( -0.000142307 0.000154357 )
------------------------------------------------------------
# Chi-Squared = 65.00 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 57 degrees of freedom
# Null hypothesis probability = 2.180927e-01
Photon flux (15-150 keV) in 64 sec: 7.05200E-02 ( -0.0178417 0.0180714 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2195e-07 ( -6.94541e-08 7.7305e-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: -3.74415 ( -6.20977 3.01349 )
Epeak [keV] : 27.3875 ( -6.33443 5.1505 )
Norm@50keV : 8.05570 ( )
------------------------------------------------------------
# Chi-Squared = 56.03 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 56 degrees of freedom
# Null hypothesis probability = 4.739085e-01
Photon flux (15-150 keV) in 64 sec: 7.22333E-02 ( -0.0165422 0.016892 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96458e-07 ( -4.91341e-08 5.29754e-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 : 3.18744 ( -2.62003 -2.0035 )
beta : -9.37167 ( 10 19.9979 )
Epeak [keV] : 27.4122 ( -2.84457 5.24607 )
Norm@50keV : 3.21603 ( -3.21628 23.0706 )
------------------------------------------------------------
# Chi-Squared = 55.98 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 55 degrees of freedom
# Null hypothesis probability = 4.377377e-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] : 6.82998 (-1.25529 1.46671)
R^2/D10^2 : 0.171363 (-0.0957379 0.223907)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 56.31 using 59 PHA bins.
# Reduced chi-squared = 0.9879 for 57 degrees of freedom
# Null hypothesis probability = 5.009691e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.006e-08 3.959e-08
25- 50 1.045e-07 4.881e-08
50-150 1.583e-08 1.267e-08
15-150 2.004e-07 1.176e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 25.8519 (-9.28313 17.0028)
Norm : 0.686348 (-0.257434 0.441204)
------------------------------------------------------------
# Chi-Squared = 60.49 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 57 degrees of freedom
# Null hypothesis probability = 3.508570e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.218e-08 3.159e-08
25- 50 8.604e-08 4.127e-08
50-150 3.841e-08 3.041e-08
15-150 2.066e-07 9.711e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.88645 (-6.86928 -6.86928)
R1^2/D10^2 : 7.53139E-02 (-0.0754797 -0.0754797)
kT2 [keV] : 6.79129 (-6.81396 -6.81396)
R2^2/D10^2 : 9.56641E-02 (-0.0958866 -0.0958866)
------------------------------------------------------------
# Chi-Squared = 56.31 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 55 degrees of freedom
# Null hypothesis probability = 4.256810e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.001e-08 4.019e-01
25- 50 1.045e-07 3.443e+00
50-150 1.588e-08 9.130e+01
15-150 2.004e-07 9.101e+01
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: 2.61003 ( -0.446254 0.562563 )
Norm@50keV : 3.34733E-04 ( -0.000142307 0.000154357 )
------------------------------------------------------------
# Chi-Squared = 65.00 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 57 degrees of freedom
# Null hypothesis probability = 2.180927e-01
Photon flux (15-150 keV) in 64 sec: 7.05200E-02 ( -0.0178417 0.0180714 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2195e-07 ( -6.94541e-08 7.7305e-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: -3.74415 ( -6.20977 3.01349 )
Epeak [keV] : 27.3875 ( -6.33443 5.1505 )
Norm@50keV : 8.05570 ( )
------------------------------------------------------------
# Chi-Squared = 56.03 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 56 degrees of freedom
# Null hypothesis probability = 4.739085e-01
Photon flux (15-150 keV) in 64 sec: 7.22333E-02 ( -0.0165422 0.016892 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96458e-07 ( -4.91341e-08 5.29754e-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 : 3.18744 ( -2.62003 -2.0035 )
beta : -9.37167 ( 10 19.9979 )
Epeak [keV] : 27.4122 ( -2.84457 5.24607 )
Norm@50keV : 3.21603 ( -3.21628 23.0691 )
------------------------------------------------------------
# Chi-Squared = 55.98 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 55 degrees of freedom
# Null hypothesis probability = 4.377377e-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] : 6.82998 (-1.25529 1.46671)
R^2/D10^2 : 0.171363 (-0.0957379 0.223907)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 56.31 using 59 PHA bins.
# Reduced chi-squared = 0.9879 for 57 degrees of freedom
# Null hypothesis probability = 5.009691e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.006e-08 3.910e-08
25- 50 1.045e-07 4.395e-08
50-150 1.583e-08 1.200e-08
15-150 2.004e-07 9.477e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 25.8519 (-9.28313 17.0028)
Norm : 0.686348 (-0.257434 0.441204)
------------------------------------------------------------
# Chi-Squared = 60.49 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 57 degrees of freedom
# Null hypothesis probability = 3.508570e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.218e-08 3.631e-08
25- 50 8.604e-08 4.415e-08
50-150 3.841e-08 3.165e-08
15-150 2.066e-07 9.142e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.88645 (-6.86928 -6.86928)
R1^2/D10^2 : 7.53139E-02 (-0.0754797 -0.0754797)
kT2 [keV] : 6.79129 (-6.81396 -6.81396)
R2^2/D10^2 : 9.56641E-02 (-0.0958866 -0.0958866)
------------------------------------------------------------
# Chi-Squared = 56.31 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 55 degrees of freedom
# Null hypothesis probability = 4.256810e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.001e-08 4.010e-01
25- 50 1.045e-07 3.766e+00
50-150 1.588e-08 9.075e+01
15-150 2.004e-07 8.486e+01
Plot creation:
Thu Jun 28 13:23:52 EDT 2012