batgrbproduct Analysis for Trigger=610953
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 Aug 29 01:52:28 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger610953/batgroup_hand_proc
======================================================================
Trigger: 00610953 Segment: 000
BAT Trigger Time: 430901666.496 [s; MET]
Trigger Stop: 430901667.52 [s; MET]
UTC: 2014-08-28T06:54:14.043420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 142.011386710826 Dec: 14.5900409767357 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.41
Image Trigger?: NO
Rate S/N Ratio: 15.8429795177549 [ if not an image trigger ]
Image S/N Ratio: 7.41
Flight Position: [ source = BAT ]
RA: 142.011386710826 Dec: 14.5900409767357 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 142.029186361612 Dec: 14.5692160838886 [deg; J2000]
{ 09h 28m 07.0s , +14d 34' 09.2" }
+/- 1.30752446276221 [arcmin] (estimated 90% radius based on SNR)
+/- 0.423190574306311 [arcmin] (formal 1-sigma fit error)
SNR: 20.7377430988082
Angular difference between Flight and Ground position is 1.621586 arcmin
Partial Coding Fraction: 0.2617188 [ including projection effects ]
Duration
T90: 18.8160000443459 +/- 3.9532952948706
Measured from: -4.34399998188019
to: 14.4720000624657 [s; relative to TRIGTIME]
T50: 6.81600004434586 +/- 1.25994286821812
Measured from: -0.744000017642975
to: 6.07200002670288 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.508000016212463
to: 1.50800001621246 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.81599998474121
to: 18.4399999976158 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.694719 0.909006 0.582660 0.141473
0.054631 0.055980 0.050548 0.045048 [error]
Peak 0.073885 0.099082 0.076948 -0.002382
0.011476 0.012367 0.012074 0.009532 [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 2.53e-07 3.91e-07 4.56e-07 1.02e-06 1.40e-06 2.12e-06 erg/cm2
Error 2.82e-08 2.87e-08 4.92e-08 2.24e-07 1.17e-07 2.71e-07 erg/cm2
Peak flux Power-law 8.56e-01 7.37e-01 4.34e-01 3.83e-01 2.19e+00 2.41e+00 ph/cm2/s
Error 1.77e-01 1.06e-01 9.06e-02 1.51e-01 3.16e-01 3.53e-01 ph/cm2/s
Fluence Cutoff-PL 2.16e-07 4.43e-07 4.61e-07 2.30e-07 1.28e-06 1.35e-06 erg/cm2
Error 3.43e-08 3.96e-08 5.78e-08 1.75e-07 1.27e-07 2.12e-07 erg/cm2
Peak flux Cutoff-PL 7.31e-01 8.43e-01 4.64e-01 1.22e-01 2.13e+00 2.16e+00 ph/cm2/s
Error 2.06e-01 1.38e-01 1.09e-01 -------- 3.19e-01 3.40e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 7.47e-01 8.24e-01 4.66e-01 -------- -------- 2.21e+00 ph/cm2/s
Error 1.99e-01 1.41e-01 -------- -------- -------- 3.45e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.780 0.127 - - 6.27e-03 5.06e-04 81.570 57
CPL 0.606 0.677 54.2 10.5 2.68e-02 2.61e-02 70.260 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.764 0.237 - - 1.61e-02 2.64e-03 59.240 57
CPL 0.578 1.059 55.6 26.8 7.04e-02 1.49e-01 54.370 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: 12.224000 sec.
T50 in the 50-300 keV band: 6.080000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 24.256 -5.816 18.440
T90 18.816 -4.344 14.472
T50 6.816 -0.744 6.072
Peak 1.000 0.508 1.508
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
142.0292 14.5692 0.0093 38.1028 -60.1597 2.4533148 20.738 TRIG_00610953
Foreground time interval of the image:
-5.816 18.440 (delta_t = 24.256 [sec])
Background time interval of the image:
-239.496 -128.587 (delta_t = 110.909 [sec])
-127.496 -123.890 (delta_t = 3.606 [sec])
-122.496 -5.816 (delta_t = 116.680 [sec])
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 -5.816 sec. to 18.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78009 ( -0.125483 0.128589 )
Norm@50keV : 6.26735E-03 ( -0.000508444 0.000503662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.57 using 59 PHA bins.
# Reduced chi-squared = 1.431 for 57 degrees of freedom
# Null hypothesis probability = 1.806951e-02
Photon flux (15-150 keV) in 24.26 sec: 0.857052 ( -0.0634148 0.0634736 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40086e-06 ( -1.16081e-07 1.17164e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.816 sec. to 18.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.605798 ( -0.724884 0.628205 )
Epeak [keV] : 54.2392 ( -7.14641 13.7685 )
Norm@50keV : 2.68243E-02 ( -0.0143172 0.0379404 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.26 using 59 PHA bins.
# Reduced chi-squared = 1.255 for 56 degrees of freedom
# Null hypothesis probability = 9.521346e-02
Photon flux (15-150 keV) in 24.26 sec: 0.815639 ( -0.066886 0.066936 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2785e-06 ( -1.24791e-07 1.29815e-07 ) ergs/cm2
Band function
Time interval is from -5.816 sec. to 18.440 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.594197 ( -0.595635 0.859296 )
beta : -2.94874 ( 2.95272 0.813966 )
Epeak [keV] : 53.7231 ( -8.31501 10.0026 )
Norm@50keV : 2.73770E-02 ( -0.00945181 0.0519698 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.84 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 55 degrees of freedom
# Null hypothesis probability = 8.587227e-02
Photon flux (15-150 keV) in 24.26 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] : 12.4793 (-0.94023 1.01288)
R^2/D10^2 : 0.183927 (-0.0463131 0.0617335)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.86 using 59 PHA bins.
# Reduced chi-squared = 1.541 for 57 degrees of freedom
# Null hypothesis probability = 5.400960e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.473e-07 1.903e-08
25- 50 4.850e-07 3.930e-08
50-150 4.658e-07 8.418e-08
15-150 1.098e-06 9.498e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9783 (-22.4244 35.9441)
Norm : 3.81512 (-0.37599 0.418063)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.54 using 59 PHA bins.
# Reduced chi-squared = 1.290 for 57 degrees of freedom
# Null hypothesis probability = 6.927800e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.419e-07 2.809e-08
25- 50 4.183e-07 3.651e-08
50-150 6.778e-07 2.193e-07
15-150 1.338e-06 2.391e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.44383 (-1.29528 1.88514)
R1^2/D10^2 : 3.74705 (-2.76176 14.5746)
kT2 [keV] : 15.1106 (-1.73124 2.63709)
R2^2/D10^2 : 7.88029E-02 (-0.0402329 0.0314112)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.56 using 59 PHA bins.
# Reduced chi-squared = 1.246 for 55 degrees of freedom
# Null hypothesis probability = 1.035204e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.259e-07 9.089e-08
25- 50 4.301e-07 1.114e-07
50-150 5.707e-07 1.390e-07
15-150 1.227e-06 2.293e-07
Peak spectrum fit
Power-law model
Time interval is from 0.508 sec. to 1.508 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76383 ( -0.229729 0.244554 )
Norm@50keV : 1.61300E-02 ( -0.00266516 0.0026121 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.24 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 57 degrees of freedom
# Null hypothesis probability = 3.937904e-01
Photon flux (15-150 keV) in 1 sec: 2.19227 ( -0.315668 0.315741 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48734e-07 ( -2.49194e-08 2.54087e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.508 sec. to 1.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.578421 ( -1.17611 0.941927 )
Epeak [keV] : 55.6433 ( -12.9901 40.6771 )
Norm@50keV : 7.03670E-02 ( -0.0703573 0.228429 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.37 using 59 PHA bins.
# Reduced chi-squared = 0.9708 for 56 degrees of freedom
# Null hypothesis probability = 5.369324e-01
Photon flux (15-150 keV) in 1 sec: 2.13133 ( -0.31828 0.31878 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.508 sec. to 1.508 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.576851 ( -0.721243 1.5052 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 55.6099 ( -12.9575 18.7087 )
Norm@50keV : 7.05164E-02 ( -0.0705161 0.228546 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.37 using 59 PHA bins.
# Reduced chi-squared = 0.9885 for 55 degrees of freedom
# Null hypothesis probability = 4.987916e-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] : 12.6345 (-2.10151 2.39711)
R^2/D10^2 : 0.462502 (-0.215307 0.424449)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.47 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.189713e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.566e-08 4.624e-09
25- 50 5.227e-08 1.105e-08
50-150 5.185e-08 1.536e-08
15-150 1.198e-07 2.352e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 103.959 (-39.1317 87.4919)
Norm : 9.75861 (-1.66933 2.09487)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.87 using 59 PHA bins.
# Reduced chi-squared = 0.9802 for 57 degrees of freedom
# Null hypothesis probability = 5.174771e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.550e-08 5.005e-09
25- 50 4.444e-08 9.995e-09
50-150 7.360e-08 3.857e-08
15-150 1.435e-07 5.282e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.34921 (-2.07034 3.07614)
R1^2/D10^2 : 5.44779 (-4.24942 32.6218)
kT2 [keV] : 17.4435 (-3.945 7.11308)
R2^2/D10^2 : 0.115125 (-0.0885519 0.162866)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.84 using 59 PHA bins.
# Reduced chi-squared = 0.9606 for 55 degrees of freedom
# Null hypothesis probability = 5.577715e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.431e-08 1.293e-08
25- 50 4.522e-08 2.324e-08
50-150 7.076e-08 4.231e-08
15-150 1.403e-07 7.480e-08
Plot creation:
Fri Aug 29 02:01:13 EDT 2014