batgrbproduct Analysis for Trigger=668641
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): Tue Dec 29 20:03:25 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger668641/GCN5_download_cron
======================================================================
Trigger: 00668641 Segment: 000
BAT Trigger Time: 473035650.56 [s; MET]
Trigger Stop: 473035651.584 [s; MET]
UTC: 2015-12-28T22:47:14.940840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 344.440697667699 Dec: 8.07622585061263 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.83
Image Trigger?: NO
Rate S/N Ratio: 26.2488094968134 [ if not an image trigger ]
Image S/N Ratio: 11.83
Flight Position: [ source = BAT ]
RA: 344.440697667699 Dec: 8.07622585061263 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 344.425904101947 Dec: 8.08845757670119 [deg; J2000]
{ 22h 57m 42.2s , +08d 05' 18.4" }
+/- 0.940252251299984 [arcmin] (estimated 90% radius based on SNR)
+/- 0.372398601924542 [arcmin] (formal 1-sigma fit error)
SNR: 33.2154921323296
Angular difference between Flight and Ground position is 1.144945 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 48 +/- 16
Measured from: -15.5599998831749
to: 32.4400001168251 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 0.440000116825104
to: 16.4400001168251 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.93999999761581
to: 8.93999999761581 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.5600000023842
to: 48.4399999976158 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.261125 1.614335 1.137520 0.169615
0.049757 0.052778 0.046504 0.039890 [error]
Peak 0.044822 0.065612 0.036385 0.004617
0.006636 0.007329 0.006359 0.004796 [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 3.80e-07 6.42e-07 8.26e-07 2.13e-06 2.44e-06 3.98e-06 erg/cm2
Error 2.61e-08 2.63e-08 4.55e-08 2.53e-07 1.07e-07 2.88e-07 erg/cm2
Peak flux Power-law 4.51e-01 4.17e-01 2.67e-01 2.64e-01 1.25e+00 1.40e+00 ph/cm2/s
Error 8.66e-02 5.41e-02 4.98e-02 9.47e-02 1.60e-01 1.88e-01 ph/cm2/s
Fluence Cutoff-PL 3.46e-07 6.74e-07 8.42e-07 9.85e-07 2.32e-06 2.85e-06 erg/cm2
Error 3.18e-08 3.19e-08 4.92e-08 4.08e-07 1.24e-07 4.24e-07 erg/cm2
Peak flux Cutoff-PL 4.11e-01 4.61e-01 2.74e-01 9.79e-02 1.21e+00 1.24e+00 ph/cm2/s
Error 9.95e-02 7.53e-02 5.72e-02 1.50e-01 1.65e-01 2.09e-01 ph/cm2/s
Fluence Band -------- 5.50e-07 -------- 8.01e-07 -------- 2.32e-06 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 1.638 0.073 - - 4.09e-03 1.68e-04 63.000 57
CPL 1.096 0.317 81.6 28.2 7.70e-03 2.88e-03 53.320 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.642 0.219 - - 9.56e-03 1.38e-03 38.840 57
CPL 0.809 1.062 63.6 -23.0 2.78e-02 6.61e-02 36.570 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: 26.816000 sec.
T50 in the 50-300 keV band: 11.584000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 -15.560 48.440
T90 48.000 -15.560 32.440
T50 16.000 0.440 16.440
Peak 1.000 7.940 8.940
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
344.4259 +8.0885 0.0058 1.6 -86.0 2.1397 33.2 TRIG_00668641
------------------------------------------
Foreground time interval of the image:
-15.560 10.441 (delta_t = 26.001 [sec])
Background time interval of the image:
-239.560 -15.560 (delta_t = 224.000 [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 -15.560 sec. to 48.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63835 ( -0.0726276 0.0731788 )
Norm@50keV : 4.08831E-03 ( -0.000168446 0.000167917 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.00 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.724435e-01
Photon flux (15-150 keV) in 64 sec: 0.531802 ( -0.0216939 0.0217275 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43638e-06 ( -1.07059e-07 1.07577e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.560 sec. to 48.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09552 ( -0.328329 0.305577 )
Epeak [keV] : 81.6483 ( -14.4046 41.9897 )
Norm@50keV : 7.69649E-03 ( -0.00225904 0.00350285 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.32 using 59 PHA bins.
# Reduced chi-squared = 0.9522 for 56 degrees of freedom
# Null hypothesis probability = 5.767938e-01
Photon flux (15-150 keV) in 64 sec: 0.514113 ( -0.023634 0.023679 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32164e-06 ( -1.23949e-07 1.2455e-07 ) ergs/cm2
Band function
Time interval is from -15.560 sec. to 48.440 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.08130 ( -0.311178 0.467666 )
beta : -2.27744 ( 2.28696 0.497951 )
Epeak [keV] : 80.3274 ( -25.4372 41.5338 )
Norm@50keV : 7.83899E-03 ( -0.00236117 0.00719322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.22 using 59 PHA bins.
# Reduced chi-squared = 0.9677 for 55 degrees of freedom
# Null hypothesis probability = 5.427306e-01
Photon flux (15-150 keV) in 64 sec: 0.513699 ( 6.4863 -0.023601 ) 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] : 13.9325 ( )
R^2/D10^2 : 7.44989E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 157.64 using 59 PHA bins.
# Reduced chi-squared = 2.7656 for 57 degrees of freedom
# Null hypothesis probability = 2.238630e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.956e-07 1.482e-08
25- 50 7.240e-07 3.488e-08
50-150 9.231e-07 7.648e-08
15-150 1.843e-06 8.576e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 158.169 (-31.0971 36.4582)
Norm : 2.16708 (-0.0963761 0.117733)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.30 using 59 PHA bins.
# Reduced chi-squared = 0.9527 for 57 degrees of freedom
# Null hypothesis probability = 5.768827e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.545e-07 2.230e-08
25- 50 6.621e-07 5.773e-08
50-150 1.335e-06 3.920e-07
15-150 2.352e-06 4.269e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.10264 (-0.984011 1.15202)
R1^2/D10^2 : 0.823769 (-0.364584 0.763005)
kT2 [keV] : 20.7068 (-2.22599 3.20992)
R2^2/D10^2 : 1.45005E-02 (-0.00635561 0.00836989)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.34 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 55 degrees of freedom
# Null hypothesis probability = 4.618362e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.428e-07 5.094e-08
25- 50 6.618e-07 7.254e-08
50-150 1.257e-06 1.773e-07
15-150 2.262e-06 2.410e-07
Peak spectrum fit
Power-law model
Time interval is from 7.940 sec. to 8.940 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64180 ( -0.214019 0.223134 )
Norm@50keV : 9.56092E-03 ( -0.00139579 0.00136945 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.84 using 59 PHA bins.
# Reduced chi-squared = 0.6815 for 57 degrees of freedom
# Null hypothesis probability = 9.685598e-01
Photon flux (15-150 keV) in 1 sec: 1.24507 ( -0.160351 0.160363 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.89953e-08 ( -1.37221e-08 1.39995e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.940 sec. to 8.940 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.809194 ( -1.21421 0.909217 )
Epeak [keV] : 63.5870 ( -17.5901 -63.5865 )
Norm@50keV : 2.78100E-02 ( -0.0278107 0.104315 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.57 using 59 PHA bins.
# Reduced chi-squared = 0.6531 for 56 degrees of freedom
# Null hypothesis probability = 9.793256e-01
Photon flux (15-150 keV) in 1 sec: 1.21419 ( -0.16485 0.1643 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.23967e-08 ( -1.51093e-08 1.58673e-08 ) ergs/cm2
Band function
Time interval is from 7.940 sec. to 8.940 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.701979 ( 0.642807 0.642807 )
beta : -2.32110 ( 2.32227 0.759432 )
Epeak [keV] : 59.0799 ( -57.4165 128.523 )
Norm@50keV : 3.26460E-02 ( -0.022068 603.583 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.36 using 59 PHA bins.
# Reduced chi-squared = 0.6611 for 55 degrees of freedom
# Null hypothesis probability = 9.752812e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.32362e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2311 (-1.66659 1.98035)
R^2/D10^2 : 0.295252 (-0.124177 0.205282)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.34 using 59 PHA bins.
# Reduced chi-squared = 0.7779 for 57 degrees of freedom
# Null hypothesis probability = 8.894028e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.355e-09 2.157e-09
25- 50 3.010e-08 4.990e-09
50-150 2.742e-08 7.800e-09
15-150 6.688e-08 1.137e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 140.096 (-58.6683 -138.531)
Norm : 5.22047 (-0.733656 0.922962)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.18 using 59 PHA bins.
# Reduced chi-squared = 0.6523 for 57 degrees of freedom
# Null hypothesis probability = 9.805475e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.348e-08 5.911e-09
25- 50 2.473e-08 1.149e-08
50-150 4.742e-08 2.863e-08
15-150 8.564e-08 4.959e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.03883 (-3.75333 5.63084)
R1^2/D10^2 : 1.88692 (-1.4388 123.839)
kT2 [keV] : 18.1392 (-5.63908 -18.2664)
R2^2/D10^2 : 5.44633E-02 (-0.052222 0.193593)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.31 using 59 PHA bins.
# Reduced chi-squared = 0.6784 for 55 degrees of freedom
# Null hypothesis probability = 9.675416e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.281e-08 6.865e-09
25- 50 2.598e-08 1.325e-08
50-150 4.071e-08 2.356e-08
15-150 7.950e-08 4.165e-08
Plot creation:
Tue Dec 29 20:07:41 EST 2015