batgrbproduct Analysis for Trigger=668949
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): Sun Jan 3 07:48:15 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger668949/GCN5_download_cron
======================================================================
Trigger: 00668949 Segment: 000
BAT Trigger Time: 473275093.952 [s; MET]
Trigger Stop: 473275094.976 [s; MET]
UTC: 2015-12-31T17:17:58.319920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 305.995955581828 Dec: 33.8595250209549 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.99
Image Trigger?: NO
Rate S/N Ratio: 8.54400374531753 [ if not an image trigger ]
Image S/N Ratio: 6.99
Flight Position: [ source = BAT ]
RA: 305.995955581828 Dec: 33.8595250209549 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 305.998071140917 Dec: 33.8361055570941 [deg; J2000]
{ 20h 23m 59.5s , +33d 50' 10.0" }
+/- 1.46251271534846 [arcmin] (estimated 90% radius based on SNR)
+/- 0.6069451646917 [arcmin] (formal 1-sigma fit error)
SNR: 17.6710247952665
Angular difference between Flight and Ground position is 1.409117 arcmin
Partial Coding Fraction: 0.2070312 [ including projection effects ]
Duration
T90: 115.136000037193 +/- 11.1799706932878
Measured from: -3.08799988031387
to: 112.048000156879 [s; relative to TRIGTIME]
T50: 59.0240000486374 +/- 24.1606913983376
Measured from: 8.83200007677078
to: 67.8560001254082 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 22.2599999904633
to: 23.2599999904633 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.26399999856949
to: 123.95199996233 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.764311 3.573865 2.352485 0.452685
0.179720 0.185947 0.159074 0.130122 [error]
Peak 0.077964 0.133023 0.053104 0.022134
0.017662 0.018671 0.014940 0.011109 [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 1.20e-06 1.75e-06 1.90e-06 3.88e-06 6.03e-06 8.72e-06 erg/cm2
Error 1.17e-07 1.07e-07 1.60e-07 6.77e-07 3.84e-07 8.17e-07 erg/cm2
Peak flux Power-law 1.18e+00 8.76e-01 4.31e-01 3.02e-01 2.63e+00 2.79e+00 ph/cm2/s
Error 3.16e-01 1.70e-01 1.11e-01 1.39e-01 5.20e-01 5.39e-01 ph/cm2/s
Fluence Cutoff-PL 1.09e-06 1.84e-06 1.97e-06 1.88e-06 5.84e-06 6.78e-06 erg/cm2
Error 1.41e-07 1.31e-07 1.77e-07 1.04e-06 4.13e-07 1.11e-06 erg/cm2
Peak flux Cutoff-PL 8.22e-01 1.23e+00 4.30e-01 1.86e-02 2.50e+00 2.50e+00 ph/cm2/s
Error 3.70e-01 2.62e-01 1.68e-01 4.82e-02 5.23e-01 5.24e-01 ph/cm2/s
Fluence Band 1.08e-06 1.83e-06 1.96e-06 1.93e-06 5.85e-06 6.87e-06 erg/cm2
Error 1.20e-07 1.26e-07 -------- -------- 4.07e-07 -------- 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 1.877 0.106 - - 5.00e-03 3.19e-04 66.230 57
CPL 1.321 0.445 60.4 24.1 9.60e-03 5.23e-03 61.000 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.021 0.284 - - 1.74e-02 3.66e-03 72.270 57
CPL -1.255 2.402 42.1 7.6 1.23e+00 2.59e+01 61.870 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: 110.976000 sec.
T50 in the 50-300 keV band: 39.424000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 131.216 -7.264 123.952
T90 115.136 -3.088 112.048
T50 59.024 8.832 67.856
Peak 1.000 22.260 23.260
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
305.9981 +33.8361 0.0109 50.8 -159.0 7.6323 17.7 TRIG_00668949
------------------------------------------
Foreground time interval of the image:
-7.264 123.952 (delta_t = 131.216 [sec])
Background time interval of the image:
-239.952 -147.042 (delta_t = 92.910 [sec])
-119.952 -7.264 (delta_t = 112.688 [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 -7.264 sec. to 123.952 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87728 ( -0.105047 0.10711 )
Norm@50keV : 5.00333E-03 ( -0.000319552 0.000317489 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.23 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 57 degrees of freedom
# Null hypothesis probability = 1.885669e-01
Photon flux (15-150 keV) in 131.2 sec: 0.711206 ( -0.0450111 0.0451429 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.03458e-06 ( -3.83726e-07 3.84993e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.264 sec. to 123.952 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32070 ( -0.466973 0.422116 )
Epeak [keV] : 60.4111 ( -11.1433 37.0004 )
Norm@50keV : 9.59633E-03 ( -0.00366579 0.00679162 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.00 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 56 degrees of freedom
# Null hypothesis probability = 3.010405e-01
Photon flux (15-150 keV) in 131.2 sec: 0.690444 ( -0.047434 0.047555 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.84215e-06 ( -4.12952e-07 4.13004e-07 ) ergs/cm2
Band function
Time interval is from -7.264 sec. to 123.952 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32069 ( -0.318583 0.435274 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 60.3999 ( -11.1239 37.1788 )
Norm@50keV : 9.59515E-03 ( -0.00366445 0.00679888 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.00 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 55 degrees of freedom
# Null hypothesis probability = 2.691740e-01
Photon flux (15-150 keV) in 131.2 sec: 0.701351 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.84631e-06 ( -5.84539e-06 -4.18567e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.7944 ( )
R^2/D10^2 : 0.131027 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 120.73 using 59 PHA bins.
# Reduced chi-squared = 2.1181 for 57 degrees of freedom
# Null hypothesis probability = 1.780270e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.969e-07 7.177e-08
25- 50 2.020e-06 1.528e-07
50-150 2.071e-06 2.722e-07
15-150 4.688e-06 3.129e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 94.7196 (-17.0933 23.7635)
Norm : 3.15448 (-0.278247 0.310087)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.05 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 57 degrees of freedom
# Null hypothesis probability = 3.325016e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.081e-06 1.081e-07
25- 50 1.849e-06 1.187e-07
50-150 2.903e-06 8.672e-07
15-150 5.833e-06 8.823e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.05304 (-1.40347 1.5712)
R1^2/D10^2 : 1.35952 (-0.735868 2.4136)
kT2 [keV] : 20.2315 (-3.2277 5.12083)
R2^2/D10^2 : 1.77922E-02 (-0.0107094 0.0192168)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.09 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 55 degrees of freedom
# Null hypothesis probability = 2.121123e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.063e-06 2.737e-07
25- 50 1.814e-06 3.645e-07
50-150 2.881e-06 7.282e-07
15-150 5.758e-06 1.078e-06
Peak spectrum fit
Power-law model
Time interval is from 22.260 sec. to 23.260 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02133 ( -0.273784 0.293552 )
Norm@50keV : 1.73660E-02 ( -0.0036883 0.00362975 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.27 using 59 PHA bins.
# Reduced chi-squared = 1.268 for 57 degrees of freedom
# Null hypothesis probability = 8.373219e-02
Photon flux (15-150 keV) in 1 sec: 2.63102 ( -0.519397 0.521247 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60315e-07 ( -3.25513e-08 3.28178e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 22.260 sec. to 23.260 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.25505 ( -2.8355 1.96777 )
Epeak [keV] : 42.1044 ( -6.57054 8.60142 )
Norm@50keV : 1.22752 ( -1.35685 50.52 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.87 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 56 degrees of freedom
# Null hypothesis probability = 2.746965e-01
Photon flux (15-150 keV) in 1 sec: 2.49633 ( -0.51908 0.5265 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43156e-07 ( -2.9567e-08 3.241e-08 ) ergs/cm2
Band function
Time interval is from 22.260 sec. to 23.260 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.987002 ( -1.81278 -1.20346 )
beta : -4.06520 ( 4.08953 1.67578 )
Epeak [keV] : 42.1786 ( -10.4871 8.31497 )
Norm@50keV : 0.879763 ( -1.50792 222.057 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.61 using 59 PHA bins.
# Reduced chi-squared = 1.120 for 55 degrees of freedom
# Null hypothesis probability = 2.514077e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47956e-07 ( -1.47949e-07 -3.2594e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8053 (-1.62127 1.8838)
R^2/D10^2 : 1.04462 (-0.498911 0.922215)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.93 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.047287e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.539e-08 7.705e-09
25- 50 7.014e-08 1.895e-08
50-150 4.562e-08 1.930e-08
15-150 1.411e-07 3.955e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 63.6274 (-21.8627 41.5308)
Norm : 14.1483 (-3.66923 4.56601)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.19 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 57 degrees of freedom
# Null hypothesis probability = 1.674302e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.588e-08 8.975e-09
25- 50 5.557e-08 1.279e-08
50-150 6.632e-08 2.825e-08
15-150 1.578e-07 3.825e-08
Double BB
R1^2/D10^2 : 4.70818E-05 (-4.70821e-05 -4.70821e-05)
kT2 [keV] : 10.4659 (-1.60283 1.91257)
R2^2/D10^2 : 1.15570 (-0.562971 0.607699)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.86 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.09 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.08 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 55 degrees of freedom
# Reduced chi-squared = 1.111 for 55 degrees of freedom
# Reduced chi-squared = 1.111 for 55 degrees of freedom
# Null hypothesis probability = 2.446127e-01
# Null hypothesis probability = 2.664506e-01
# Null hypothesis probability = 2.667842e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.641e-08 9.895e-07
25- 50 6.924e-08 6.530e-06
50-150 4.825e-08 9.590e-05
15-150 1.439e-07 9.615e-05
Plot creation:
Sun Jan 3 07:51:32 EST 2016