batgrbproduct Analysis for Trigger=666352
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): Sat Dec 5 19:37:19 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger666352/batgroup_hand_proc
======================================================================
Trigger: 00666352 Segment: 000
BAT Trigger Time: 471023176.448 [s; MET]
Trigger Stop: 471023179.52 [s; MET]
UTC: 2015-12-05T15:46:00.936900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 229.282355559918 Dec: 35.7691507793621 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.07
Image Trigger?: NO
Rate S/N Ratio: 16.431676725155 [ if not an image trigger ]
Image S/N Ratio: 7.07
Flight Position: [ source = BAT ]
RA: 229.282355559918 Dec: 35.7691507793621 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 229.290549843634 Dec: 35.7671507493265 [deg; J2000]
{ 15h 17m 09.7s , +35d 46' 01.7" }
+/- 1.27558638145339 [arcmin] (estimated 90% radius based on SNR)
+/- 0.430872389916709 [arcmin] (formal 1-sigma fit error)
SNR: 21.483462314195
Angular difference between Flight and Ground position is 0.416583 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 62.8320000767708 +/- 12.2822929448992
Measured from: -1.72000002861023
to: 61.1120000481606 [s; relative to TRIGTIME]
T50: 24.9920000433922 +/- 3.85131662314987
Measured from: 6.12000000476837
to: 31.1120000481606 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.97999995946884
to: 2.97999995946884 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.97600001096725
to: 69.5119999647141 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.478742 0.685136 0.744917 0.100205
0.050917 0.051877 0.046245 0.040082 [error]
Peak 0.022096 0.018162 0.032534 0.009584
0.006006 0.006097 0.006084 0.005062 [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 1.28e-07 2.87e-07 5.09e-07 2.12e-06 1.39e-06 3.04e-06 erg/cm2
Error 1.82e-08 2.42e-08 4.39e-08 4.15e-07 1.12e-07 4.41e-07 erg/cm2
Peak flux Power-law 9.16e-02 1.59e-01 2.10e-01 5.67e-01 6.14e-01 1.03e+00 ph/cm2/s
Error 5.58e-02 5.69e-02 4.43e-02 3.15e-01 1.38e-01 2.93e-01 ph/cm2/s
Fluence Cutoff-PL 1.11e-07 2.99e-07 5.38e-07 1.03e-06 1.34e-06 1.97e-06 erg/cm2
Error 2.32e-08 2.75e-08 5.21e-08 6.92e-07 1.21e-07 6.92e-07 erg/cm2
Peak flux Cutoff-PL 9.51e-02 1.62e-01 2.10e-01 5.47e-01 6.17e-01 1.02e+00 ph/cm2/s
Error -------- -------- -------- 3.50e-01 1.39e-01 3.36e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.174 0.129 - - 1.85e-03 1.35e-04 65.090 57
CPL 0.585 0.570 134.2 292.2 3.42e-03 2.14e-03 61.460 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 0.596 0.476 - - 5.25e-03 1.34e-03 56.960 57
CPL 0.602 0.482 9999.4 0.0 5.32e-03 4.53e-03 56.980 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: 30.336000 sec.
T50 in the 50-300 keV band: 15.104000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 73.488 -3.976 69.512
T90 62.832 -1.720 61.112
T50 24.992 6.120 31.112
Peak 1.000 1.980 2.980
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
229.2905 35.7672 0.0089 14.6839 143.3551 1.7572598 21.483 TRIG_00666352
Foreground time interval of the image:
-3.976 40.453 (delta_t = 44.429 [sec])
Background time interval of the image:
-255.747 -3.976 (delta_t = 251.771 [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 -3.976 sec. to 69.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17373 ( -0.129727 0.128433 )
Norm@50keV : 1.84829E-03 ( -0.000134547 0.000134526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.09 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 57 degrees of freedom
# Null hypothesis probability = 2.159118e-01
Photon flux (15-150 keV) in 73.49 sec: 0.216183 ( -0.016238 0.016268 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38849e-06 ( -1.11892e-07 1.12562e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.976 sec. to 69.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.585376 ( -0.609781 0.530516 )
Epeak [keV] : 134.208 ( -41.4797 542.833 )
Norm@50keV : 3.41994E-03 ( -0.00142809 0.0028485 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.46 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 56 degrees of freedom
# Null hypothesis probability = 2.867047e-01
Photon flux (15-150 keV) in 73.49 sec: 0.209830 ( -0.01731 0.017223 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3426e-06 ( -1.20678e-07 1.20781e-07 ) ergs/cm2
Band function
Time interval is from -3.976 sec. to 69.512 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.585388 ( -0.335269 0.561737 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 134.177 ( -29.1599 539.467 )
Norm@50keV : 3.42006E-03 ( -0.0014296 0.00284836 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.47 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 55 degrees of freedom
# Null hypothesis probability = 2.556481e-01
Photon flux (15-150 keV) in 73.49 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] : 19.9429 (-1.73947 1.96772)
R^2/D10^2 : 1.01943E-02 (-0.00270039 0.00357038)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.52 using 59 PHA bins.
# Reduced chi-squared = 1.430 for 57 degrees of freedom
# Null hypothesis probability = 1.822405e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.750e-08 8.293e-09
25- 50 2.859e-07 3.182e-08
50-150 8.426e-07 9.796e-08
15-150 1.186e-06 1.095e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-15.5333 -200)
Norm : 0.895558 (-0.0665963 0.0665963)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.81 using 59 PHA bins.
# Reduced chi-squared = 1.523 for 57 degrees of freedom
# Null hypothesis probability = 6.659925e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.639e-07 1.742e-08
25- 50 3.153e-07 4.854e-08
50-150 6.916e-07 2.594e-07
15-150 1.171e-06 2.355e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.12776 (-1.47683 1.99486)
R1^2/D10^2 : 0.442511 (-0.317747 1.5328)
kT2 [keV] : 24.1321 (-2.88866 4.03944)
R2^2/D10^2 : 5.03415E-03 (-0.00207634 0.00252199)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.55 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 55 degrees of freedom
# Null hypothesis probability = 4.168484e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.255e-07 5.644e-08
25- 50 2.730e-07 6.331e-08
50-150 9.236e-07 1.867e-07
15-150 1.322e-06 2.355e-07
Peak spectrum fit
Power-law model
Time interval is from 1.980 sec. to 2.980 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.596003 ( -0.50433 0.447432 )
Norm@50keV : 5.25222E-03 ( -0.00140468 0.0012847 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.96 using 59 PHA bins.
# Reduced chi-squared = 0.9994 for 57 degrees of freedom
# Null hypothesis probability = 4.764494e-01
Photon flux (15-150 keV) in 1 sec: 0.613525 ( -0.137708 0.138995 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.72949e-08 ( -1.50644e-08 1.50914e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.980 sec. to 2.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.601609 ( -0.526048 0.437193 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 5.31825E-03 ( -0.00143187 0.00762791 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.98 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 56 degrees of freedom
# Null hypothesis probability = 4.382601e-01
Photon flux (15-150 keV) in 1 sec: 0.616530 ( -0.141217 0.136035 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.73641e-08 ( -1.4932e-08 1.48165e-08 ) ergs/cm2
Band function
Time interval is from 1.980 sec. to 2.980 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.850869 ( 0.850524 0.850524 )
beta : -0.596067 ( -0.447181 0.504336 )
Epeak [keV] : 14.0064 ( -14.0092 -14.0092 )
Norm@50keV : 7.85908E-03 ( -0.00397015 90932.1 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.96 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.018914e-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] : 38.4409 (-11.5095 25.5017)
R^2/D10^2 : 4.92116E-03 (-0.00341835 0.00788901)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.40 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 57 degrees of freedom
# Null hypothesis probability = 3.540821e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.652e-10 5.741e-10
25- 50 6.506e-09 3.813e-09
50-150 5.916e-08 3.045e-08
15-150 6.663e-08 3.621e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-58.3124 -200)
Norm : 2.43666 (-0.574279 0.574279)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.06 using 59 PHA bins.
# Reduced chi-squared = 1.229 for 57 degrees of freedom
# Null hypothesis probability = 1.146544e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.071e-09 3.614e-09
25- 50 1.168e-08 6.905e-09
50-150 2.561e-08 1.518e-08
15-150 4.336e-08 2.529e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.00579 (-2.71762 2.6723)
R1^2/D10^2 : 4.94600 (-4.81345 15730.4)
kT2 [keV] : 46.5023 (-15.9313 62.0655)
R2^2/D10^2 : 2.94594E-03 (-0.00231601 0.00570807)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.45 using 59 PHA bins.
# Reduced chi-squared = 0.9718 for 55 degrees of freedom
# Null hypothesis probability = 5.340605e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.265e-09 3.087e-09
25- 50 6.866e-09 3.572e-09
50-150 5.933e-08 3.265e-08
15-150 7.146e-08 3.782e-08
Plot creation:
Sat Dec 5 19:46:18 EST 2015