batgrbproduct Analysis for Trigger=618634
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 Nov 15 06:39:08 EST 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger618634/GCN5_download_cron
======================================================================
Trigger: 00618634 Segment: 000
BAT Trigger Time: 437692285.12 [s; MET]
Trigger Stop: 437692312 [s; MET]
UTC: 2014-11-14T21:11:12.331980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.535845302648 Dec: -40.5342672971675 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 16.14
Image Trigger?: NO
Rate S/N Ratio: 18.4390889145858 [ if not an image trigger ]
Image S/N Ratio: 16.14
Flight Position: [ source = BAT ]
RA: 135.535845302648 Dec: -40.5342672971675 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 135.471650394544 Dec: -40.5431615249011 [deg; J2000]
{ 09h 01m 53.2s , -40d 32' 35.4" }
+/- 2.43756689662146 [arcmin] (estimated 90% radius based on SNR)
+/- 1.57912222774369 [arcmin] (formal 1-sigma fit error)
SNR: 8.51771918685752
Angular difference between Flight and Ground position is 2.975408 arcmin
Partial Coding Fraction: 0.7109375 [ including projection effects ]
Duration
T90: 938.699999928474 +/- 74.6540939881991
Measured from: -88.6439998745918
to: 850.056000053883 [s; relative to TRIGTIME]
T50: 475.771999955177 +/- 56.9782176214038
Measured from: 87.0000001192093
to: 562.772000074387 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 23.0320000052452
to: 24.0320000052452 [s; relative to TRIGTIME]
Total Fluence
Measured from: -144.736000001431
to: 883.296000003815 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 16.374861 11.509735 0.714066 0.158465
0.200597 0.200963 0.166841 0.144241 [error]
Peak 0.061157 0.042559 0.007790 0.001169
0.007632 0.007677 0.005728 0.005201 [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 6.83e-06 4.04e-06 1.52e-06 7.60e-07 1.28e-05 1.32e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 5.98e-01 3.03e-01 9.46e-02 3.77e-02 1.02e+00 1.03e+00 ph/cm2/s
Error 1.21e-01 6.42e-02 3.98e-02 2.81e-02 1.79e-01 1.84e-01 ph/cm2/s
Fluence Cutoff-PL 4.95e-06 4.87e-06 3.04e-07 1.48e-10 1.01e-05 1.01e-05 erg/cm2
Error 4.04e-07 1.78e-07 7.60e-08 2.34e-10 4.62e-07 4.62e-07 erg/cm2
Peak flux Cutoff-PL 5.97e-01 3.43e-01 5.72e-02 2.09e-03 9.99e-01 9.99e-01 ph/cm2/s
Error 1.28e-01 8.60e-02 5.68e-02 2.89e-02 1.77e-01 1.77e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 6.24e-01 3.20e-01 7.24e-02 1.97e-02 1.03e+00 1.04e+00 ph/cm2/s
Error 1.37e-01 -------- -------- -------- 1.81e-01 1.86e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.410 0.000 - - 8.35e-04 0.00e+00 307.220 57
CPL 1.000 0.000 50.0 0.0 3.14e-03 0.00e+00 1251.770 56
The chi2 of BB fit is 71.43 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 2.679 0.393 - - 4.62e-03 1.51e-03 51.500 57
CPL 1.086 2.574 17.3 0.0 5.96e-02 0.00e+00 49.890 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 1028.030 -144.736 883.296
T90 938.700 -88.644 850.056
T50 475.772 87.000 562.772
Peak 1.000 23.032 24.032
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.4717 -40.5432 0.0225 22.4 -98.9 2.9331 8.5 TRIG_00618634
------------------------------------------
Foreground time interval of the image:
-144.736 81.981 (delta_t = 226.717 [sec])
Background time interval of the image:
-239.120 -144.736 (delta_t = 94.384 [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 -144.736 sec. to 883.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.40979 ( )
Norm@50keV : 8.34807E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 307.22 using 59 PHA bins.
# Reduced chi-squared = 5.3897 for 57 degrees of freedom
# Null hypothesis probability = 5.516450e-36
Photon flux (15-150 keV) in 1028 sec: 0.314003 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2792e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -144.736 sec. to 883.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.13631E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1251.77 using 59 PHA bins.
# Reduced chi-squared = 22.3530 for 56 degrees of freedom
# Null hypothesis probability = 4.674856e-225
Photon flux (15-150 keV) in 1028 sec: 0.249165 ( -0.013795 0.013968 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01196e-05 ( -4.60112e-07 4.63926e-07 ) ergs/cm2
Band function
Time interval is from -144.736 sec. to 883.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48817 ( )
beta : -5.30627 ( )
Epeak [keV] : 8.35660 ( )
Norm@50keV : 1.61184E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 154.02 using 59 PHA bins.
# Reduced chi-squared = 2.8004 for 55 degrees of freedom
# Null hypothesis probability = 2.555692e-11
Photon flux (15-150 keV) in 1028 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] : 5.76644 (-0.147984 0.152451)
R^2/D10^2 : 1.23227 (-0.159233 0.182759)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.43 using 59 PHA bins.
# Reduced chi-squared = 1.253 for 57 degrees of freedom
# Null hypothesis probability = 9.454946e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.275e-06 2.991e-07
25- 50 4.819e-06 1.701e-07
50-150 3.739e-07 4.837e-08
15-150 1.047e-05 3.531e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.4798 ( )
Norm : 5.14621 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 148.50 using 59 PHA bins.
# Reduced chi-squared = 2.6052 for 57 degrees of freedom
# Null hypothesis probability = 4.317951e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.374e-06 2.930e-07
25- 50 4.479e-06 1.670e-07
50-150 8.405e-07 1.057e-07
15-150 1.169e-05 3.906e-07
Double BB
R1^2/D10^2 : 2.99381E-06 ( )
kT2 [keV] : 5.72163 (-0.148413 0.155309)
R2^2/D10^2 : 1.27619 (-0.16986 0.195202)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.43 using 59 PHA bins.
#Fit statistic : Chi-Squared = 66.78 using 59 PHA bins.
#Fit statistic : Chi-Squared = 66.52 using 59 PHA bins.
# Reduced chi-squared = 1.299 for 55 degrees of freedom
# Reduced chi-squared = 1.214 for 55 degrees of freedom
# Reduced chi-squared = 1.209 for 55 degrees of freedom
# Null hypothesis probability = 6.739422e-02
# Null hypothesis probability = 1.325402e-01
# Null hypothesis probability = 1.373206e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.274e-06 3.096e+01
25- 50 4.819e-06 2.617e+02
50-150 3.741e-07 6.805e+03
15-150 1.047e-05 6.137e+03
Peak spectrum fit
Power-law model
Time interval is from 23.032 sec. to 24.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.67890 ( -0.361475 0.425018 )
Norm@50keV : 4.61913E-03 ( -0.00149005 0.00152203 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.50 using 59 PHA bins.
# Reduced chi-squared = 0.9036 for 57 degrees of freedom
# Null hypothesis probability = 6.805443e-01
Photon flux (15-150 keV) in 1 sec: 1.01665 ( -0.179084 0.179242 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.87822e-08 ( -1.07839e-08 1.14292e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 23.032 sec. to 24.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08569 ( -3.76468 1.38415 )
Epeak [keV] : 17.3352 ( )
Norm@50keV : 5.96477E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.89 using 59 PHA bins.
# Reduced chi-squared = 0.8909 for 56 degrees of freedom
# Null hypothesis probability = 7.040235e-01
Photon flux (15-150 keV) in 1 sec: 0.999152 ( -0.176157 0.177848 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.27816e-08 ( -9.7489e-09 1.34019e-08 ) ergs/cm2
Band function
Time interval is from 23.032 sec. to 24.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.90741 ( -6.94359 -4.90741 )
beta : -3.12582 ( -1.31496 0.569707 )
Epeak [keV] : 20.2629 ( -5.7174 3.814 )
Norm@50keV : 5226.22 ( -897.546 107830 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.63 using 59 PHA bins.
# Reduced chi-squared = 0.8843 for 55 degrees of freedom
# Null hypothesis probability = 7.149261e-01
Photon flux (15-150 keV) in 1 sec: 1.02908 ( 5.97092 -0.181068 ) 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] : 6.01000 (-1.04514 1.22737)
R^2/D10^2 : 3.80206 (-2.09759 4.96743)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.65 using 59 PHA bins.
# Reduced chi-squared = 0.9061 for 57 degrees of freedom
# Null hypothesis probability = 6.753695e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.829e-08 6.345e-09
25- 50 1.831e-08 7.381e-09
50-150 1.688e-09 1.201e-09
15-150 3.829e-08 1.158e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 23.7651 (-7.6147 12.3176)
Norm : 10.3307 (-3.47907 5.85071)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.91 using 59 PHA bins.
# Reduced chi-squared = 0.8757 for 57 degrees of freedom
# Null hypothesis probability = 7.357440e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.829e-08 4.055e-09
25- 50 1.813e-08 5.375e-09
50-150 7.150e-09 4.729e-09
15-150 4.357e-08 1.227e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.14990 (-5.15188 1.52221)
R1^2/D10^2 : 6.57423 (-6.56322 122.659)
kT2 [keV] : 17.6928 (-17.7338 -17.7338)
R2^2/D10^2 : 1.53619E-02 (-0.0152192 4.15367)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.97 using 59 PHA bins.
# Reduced chi-squared = 0.8904 for 55 degrees of freedom
# Null hypothesis probability = 7.029705e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.894e-08 1.073e-08
25- 50 1.703e-08 9.265e-09
50-150 1.059e-08 6.715e-09
15-150 4.655e-08 2.381e-08
Plot creation:
Sat Nov 15 06:42:13 EST 2014