batgrbproduct Analysis for Trigger=524364
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 Jun 15 06:13:15 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger524364/GCN5_download_cron
======================================================================
Trigger: 00524364 Segment: 000
BAT Trigger Time: 361393920 [s; MET]
Trigger Stop: 361394240 [s; MET]
UTC: 2012-06-14T19:11:51.682120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 280.284341184998 Dec: -5.56216254774058 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.47
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.47
Flight Position: [ source = BAT ]
RA: 280.284341184998 Dec: -5.56216254774058 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.272066286761 Dec: -5.55481708496861 [deg; J2000]
{ 18h 41m 05.3s , -05d 33' 17.3" }
+/- 2.8047702424513 [arcmin] (estimated 90% radius based on SNR)
+/- 1.76787173674906 [arcmin] (formal 1-sigma fit error)
SNR: 6.97051886681807
Angular difference between Flight and Ground position is 0.855322 arcmin
Partial Coding Fraction: 0.828125 [ including projection effects ]
Duration
T90: 828.895999968052 +/- 171.181539372873
Measured from: -42.1559998989105
to: 786.740000069141 [s; relative to TRIGTIME]
T50: 328.707999944687 +/- 71.2377255136671
Measured from: 291.224000096321
to: 619.932000041008 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 341.772000014782
to: 342.772000014782 [s; relative to TRIGTIME]
Total Fluence
Measured from: -91.2960000038147
to: 811.023999989033 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.974365 2.979534 0.460067 0.135398
0.185835 0.184505 0.162479 0.153529 [error]
Peak 0.027710 0.013745 0.011151 0.004936
0.006345 0.006426 0.005615 0.005111 [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 9.91e-07 9.89e-07 6.93e-07 7.69e-07 2.98e-06 3.44e-06 erg/cm2
Error 1.01e-07 9.05e-08 1.26e-07 2.58e-07 2.97e-07 4.43e-07 erg/cm2
Peak flux Power-law 2.12e-01 1.34e-01 5.47e-02 3.02e-02 4.17e-01 4.31e-01 ph/cm2/s
Error 9.25e-02 5.37e-02 4.27e-02 5.07e-02 1.45e-01 1.56e-01 ph/cm2/s
Fluence Cutoff-PL 8.85e-07 1.22e-06 3.50e-07 1.01e-08 2.46e-06 0.00e+00 erg/cm2
Error 1.17e-07 1.27e-07 1.57e-07 2.64e-08 2.57e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.12e-01 1.34e-01 5.46e-02 2.99e-02 4.17e-01 4.31e-01 ph/cm2/s
Error 9.24e-02 5.37e-02 4.26e-02 3.39e-02 1.45e-01 1.58e-01 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 2.88e-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 2.514 0.175 - - 3.31e-04 4.41e-05 73.350 57
CPL -0.255 1.422 27.2 3.8 2.05e-02 1.43e-01 51.140 56
The chi2 of BB fit is 52.75 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 2.296 0.867 - - 2.39e-03 1.90e-03 40.570 57
CPL 1.753 0.000 21.9 0.0 4.67e-03 0.00e+00 40.990 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 902.320 -91.296 811.024
T90 828.896 -42.156 786.740
T50 328.708 291.224 619.932
Peak 1.000 341.772 342.772
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.2721 -5.5548 0.0276 16.0 118.1 2.0159 7.0 TRIG_00524364
------------------------------------------
Foreground time interval of the image:
-17.899 266.000 (delta_t = 283.899 [sec])
267.000 338.301 (delta_t = 71.301 [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
Multiple GTIs in the spectrum
tstart tstop
-91.296000 266.000000
267.000000 343.610000
346.000000 379.450000
381.000000 386.293500
388.000000 811.024000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.51388 ( -0.169745 0.17975 )
Norm@50keV : 3.31176E-04 ( -4.40489e-05 4.42005e-05 )
------------------------------------------------------------
# Chi-Squared = 73.35 using 59 PHA bins.
# Reduced chi-squared = 1.287 for 57 degrees of freedom
# Null hypothesis probability = 7.126904e-02
Photon flux (15-150 keV) in 895.7 sec: 6.56150E-02 ( -0.005342 0.00534213 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.97743e-06 ( -2.93085e-07 3.01367e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-91.296000 266.000000
267.000000 343.610000
346.000000 379.450000
381.000000 386.293500
388.000000 811.024000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.255404 ( -1.58736 1.25682 )
Epeak [keV] : 27.2458 ( -4.64061 3.00523 )
Norm@50keV : 2.05316E-02 ( -0.0270236 0.259259 )
------------------------------------------------------------
# Chi-Squared = 51.14 using 59 PHA bins.
# Reduced chi-squared = 0.9132 for 56 degrees of freedom
# Null hypothesis probability = 6.589686e-01
Photon flux (15-150 keV) in 895.7 sec: 6.08546E-02 ( -0.0053826 0.0054547 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46326e-06 ( -2.44383e-07 2.69534e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-91.296000 266.000000
267.000000 343.610000
346.000000 379.450000
381.000000 386.293500
388.000000 811.024000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.435773 ( -1.40415 1.40506 )
beta : -9.99950 ( 6303.99 6313.99 )
Epeak [keV] : 27.5319 ( -4.66625 3.03155 )
Norm@50keV : 2.73494E-02 ( -0.0272255 0.25944 )
------------------------------------------------------------
# Chi-Squared = 51.02 using 59 PHA bins.
# Reduced chi-squared = 0.9276 for 55 degrees of freedom
# Null hypothesis probability = 6.275540e-01
Photon flux (15-150 keV) in 895.7 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] : 7.38406 (-0.556341 0.599874)
R^2/D10^2 : 0.100758 (-0.0282607 0.0396154)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 52.75 using 59 PHA bins.
# Reduced chi-squared = 0.9255 for 57 degrees of freedom
# Null hypothesis probability = 6.349744e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.328e-07 1.034e-07
25- 50 1.262e-06 1.397e-07
50-150 2.528e-07 7.421e-08
15-150 2.348e-06 2.194e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.9915 (-4.91087 6.27192)
Norm : 0.529743 (-0.0848527 0.104125)
------------------------------------------------------------
# Chi-Squared = 57.13 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.703013e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.656e-07 9.700e-08
25- 50 1.103e-06 1.146e-07
50-150 6.039e-07 1.821e-07
15-150 2.673e-06 2.893e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.89772 (-1.87847 34.0583)
R1^2/D10^2 : 23.2244 (-26.6678 -26.6747)
kT2 [keV] : 7.75021 (-0.706006 -7.73364)
R2^2/D10^2 : 7.91845E-02 (-0.0800851 0.0421541)
------------------------------------------------------------
# Chi-Squared = 49.98 using 59 PHA bins.
# Reduced chi-squared = 0.9088 for 55 degrees of freedom
# Null hypothesis probability = 6.663212e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.709e-07 2.263e-07
25- 50 1.247e-06 2.002e-07
50-150 2.940e-07 9.906e-08
15-150 2.411e-06 4.375e-07
Peak spectrum fit
Power-law model
Time interval is from 341.772 sec. to 342.772 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.29567 ( -0.73931 0.995552 )
Norm@50keV : 2.39012E-03 ( -0.00239012 0.00140341 )
------------------------------------------------------------
# Chi-Squared = 40.57 using 59 PHA bins.
# Reduced chi-squared = 0.7118 for 57 degrees of freedom
# Null hypothesis probability = 9.508568e-01
Photon flux (15-150 keV) in 1 sec: 0.416689 ( -0.144934 0.145277 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28221e-08 ( -1.03383e-08 1.20884e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 341.772 sec. to 342.772 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75289 ( )
Epeak [keV] : 21.8562 ( )
Norm@50keV : 4.66947E-03 ( )
------------------------------------------------------------
# Chi-Squared = 40.99 using 59 PHA bins.
# Reduced chi-squared = 0.7319 for 56 degrees of freedom
# Null hypothesis probability = 9.338893e-01
Photon flux (15-150 keV) in 1 sec: 0.416531 ( -0.144674 0.145146 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79418e-08 ( -1.65404e-08 2.67266e-08 ) ergs/cm2
Band function
Time interval is from 341.772 sec. to 342.772 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.96056 ( 1.55142 1.55142 )
beta : -2.49621 ( 2.37405 0.810324 )
Epeak [keV] : 20.1701 ( -15.5263 -15.5263 )
Norm@50keV : 44.6661 ( -45.5301 5307.96 )
------------------------------------------------------------
# Chi-Squared = 40.42 using 59 PHA bins.
# Reduced chi-squared = 0.7349 for 55 degrees of freedom
# Null hypothesis probability = 9.293987e-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] : 6.21628 (-2.1686 3.4155)
R^2/D10^2 : 1.25634 (-1.25358 6.86937)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 42.28 using 59 PHA bins.
# Reduced chi-squared = 0.7417 for 57 degrees of freedom
# Null hypothesis probability = 9.272511e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.776e-09 4.271e-09
25- 50 7.291e-09 4.705e-09
50-150 7.703e-10 6.945e-10
15-150 1.484e-08 9.425e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.2406 (-21.878 -34.2634)
Norm : 2.96511 (-1.61237 5.27742)
------------------------------------------------------------
# Chi-Squared = 41.18 using 59 PHA bins.
# Reduced chi-squared = 0.7225 for 57 degrees of freedom
# Null hypothesis probability = 9.431908e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.419e-09 4.023e-09
25- 50 7.859e-09 4.935e-09
50-150 5.084e-09 4.238e-09
15-150 1.936e-08 1.248e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.42755 (-2.3763 2.94006)
R1^2/D10^2 : 2.06827 (-1.00797 33.467)
kT2 [keV] : 64.2229 (-66.3188 -72.9508)
R2^2/D10^2 : 3.30925E-04 (-0.000262559 0.748315)
------------------------------------------------------------
# Chi-Squared = 39.39 using 59 PHA bins.
# Reduced chi-squared = 0.7161 for 55 degrees of freedom
# Null hypothesis probability = 9.444587e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.029e-09 4.277e-09
25- 50 6.419e-09 3.675e-09
50-150 1.433e-08 1.025e-08
15-150 2.778e-08 1.481e-08
Plot creation:
Fri Jun 15 06:37:11 EDT 2012