batgrbproduct Analysis for Trigger=672897
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): Mon Feb 8 18:43:20 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger672897/GCN5_download_cron
======================================================================
Trigger: 00672897 Segment: 000
BAT Trigger Time: 476581808 [s; MET]
Trigger Stop: 476581904 [s; MET]
UTC: 2016-02-07T23:49:52.189120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 156.058699134501 Dec: 19.7705673189114 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.93
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.93
Flight Position: [ source = BAT ]
RA: 156.058699134501 Dec: 19.7705673189114 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 156.053996444496 Dec: 19.7198856422743 [deg; J2000]
{ 10h 24m 13.0s , +19d 43' 11.6" }
+/- 5.25058065889906 [arcmin] (estimated 90% radius based on SNR)
+/- 2.92321223669396 [arcmin] (formal 1-sigma fit error)
SNR: 2.84610395848017
Angular difference between Flight and Ground position is 3.052475 arcmin
Partial Coding Fraction: 0.796875 [ including projection effects ]
Duration
T90: 96 +/-
Measured from: 0
to: 96 [s; relative to TRIGTIME]
T50: 96 +/-
Measured from: 0
to: 96 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 96 second)
Measured from: 0
to: 96 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 96 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.295603 0.214274 -0.083987 -0.025223
0.066394 0.068615 0.058691 0.050462 [error]
Peak 0.295603 0.214274 -0.083987 -0.025223
0.066394 0.068615 0.058691 0.050462 [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 6.40e-08 5.79e-08 3.65e-08 3.48e-08 1.73e-07 2.00e-07 erg/cm2
Error 2.72e-08 2.96e-08 3.85e-08 6.65e-08 9.14e-08 1.28e-07 erg/cm2
Peak flux Power-law 2.19e-02 1.13e-02 3.64e-03 1.49e-03 3.77e-02 3.82e-02 ph/cm2/s
Error 9.46e-03 5.52e-03 3.63e-03 2.47e-03 1.57e-02 1.62e-02 ph/cm2/s
Fluence Cutoff-PL 6.65e-08 8.79e-08 8.65e-09 1.04e-11 1.63e-07 1.64e-07 erg/cm2
Error 3.26e-08 6.78e-08 2.39e-08 3.81e-09 6.73e-08 6.71e-08 erg/cm2
Peak flux Cutoff-PL 2.19e-02 1.74e-02 9.83e-04 6.43e-07 4.03e-02 4.04e-02 ph/cm2/s
Error 1.65e-02 8.99e-03 2.43e-03 2.01e-04 1.47e-02 1.47e-02 ph/cm2/s
Fluence Band 6.54e-08 8.75e-08 1.70e-08 8.86e-11 1.68e-07 1.67e-07 erg/cm2
Error -------- 6.68e-08 2.58e-08 -------- -------- -------- 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 2.656 0.806 - - 1.73e-04 1.20e-04 95.230 57
CPL -2.242 0.000 26.6 0.0 4.24e-01 0.00e+00 90.470 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.656 0.806 - - 1.73e-04 1.20e-04 95.230 57
CPL -2.242 0.000 26.6 0.0 4.24e-01 0.00e+00 90.470 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 96.000 0.000 96.000
T90 96.000 0.000 96.000
T50 96.000 0.000 96.000
Peak 96.000 0.000 96.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
156.0540 +19.7199 0.0677 17.9 125.7 0.3876 2.8 TRIG_00672897
------------------------------------------
Foreground time interval of the image:
0.000 96.000 (delta_t = 96.000 [sec])
Background time interval of the image:
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 0.000 sec. to 96.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.65568 ( -0.674354 0.93726 )
Norm@50keV : 1.73432E-04 ( -0.000110319 0.00012968 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.23 using 59 PHA bins.
# Reduced chi-squared = 1.671 for 57 degrees of freedom
# Null hypothesis probability = 1.124148e-03
Photon flux (15-150 keV) in 96 sec: 3.76790E-02 ( -0.0155087 0.0158491 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72533e-07 ( -8.53288e-08 9.75312e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 96.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.24206 ( )
Epeak [keV] : 26.6167 ( )
Norm@50keV : 0.424385 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.47 using 59 PHA bins.
# Reduced chi-squared = 1.616 for 56 degrees of freedom
# Null hypothesis probability = 2.410291e-03
Photon flux (15-150 keV) in 96 sec: 4.02886E-02 ( -0.0145447 0.0147983 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62791e-07 ( -6.35395e-08 7.1088e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 96.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.55267 ( -3.7083 -2.00348 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 26.8610 ( -7.69033 8.66389 )
Norm@50keV : 3.64425 ( -1.30196 75.0727 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.44 using 59 PHA bins.
# Reduced chi-squared = 1.644 for 55 degrees of freedom
# Null hypothesis probability = 1.838797e-03
Photon flux (15-150 keV) in 96 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67502e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.73632 (-1.92379 2.41079)
R^2/D10^2 : 0.100826 (-0.100829 0.302953)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.59 using 59 PHA bins.
# Reduced chi-squared = 1.589 for 57 degrees of freedom
# Null hypothesis probability = 3.076158e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.769e-08 4.152e-08
25- 50 8.595e-08 5.765e-08
50-150 1.237e-08 1.176e-08
15-150 1.660e-07 1.035e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.5729 (-12.0052 28.9967)
Norm : 0.393981 (-0.206104 0.460146)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 92.74 using 59 PHA bins.
# Reduced chi-squared = 1.627 for 57 degrees of freedom
# Null hypothesis probability = 1.941167e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.849e-08 4.229e-08
25- 50 6.942e-08 4.599e-08
50-150 2.878e-08 2.744e-08
15-150 1.667e-07 1.138e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.81918 (-6.79257 -6.79257)
R1^2/D10^2 : 5.02965E-02 (-0.0504614 -0.0504614)
kT2 [keV] : 6.66646 (-6.7108 -6.7108)
R2^2/D10^2 : 5.00547E-02 (-0.0503045 -0.0503045)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.59 using 59 PHA bins.
# Reduced chi-squared = 1.647 for 55 degrees of freedom
# Null hypothesis probability = 1.782328e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.759e-08 1.569e-01
25- 50 8.607e-08 1.330e+00
50-150 1.247e-08 3.325e+01
15-150 1.661e-07 3.478e+01
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 96.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.65568 ( -0.674354 0.93726 )
Norm@50keV : 1.73432E-04 ( -0.000110319 0.00012968 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.23 using 59 PHA bins.
# Reduced chi-squared = 1.671 for 57 degrees of freedom
# Null hypothesis probability = 1.124148e-03
Photon flux (15-150 keV) in 96 sec: 3.76790E-02 ( -0.0155087 0.0158491 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72533e-07 ( -8.53288e-08 9.75312e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 96.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.24206 ( )
Epeak [keV] : 26.6167 ( )
Norm@50keV : 0.424385 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.47 using 59 PHA bins.
# Reduced chi-squared = 1.616 for 56 degrees of freedom
# Null hypothesis probability = 2.410291e-03
Photon flux (15-150 keV) in 96 sec: 4.02886E-02 ( -0.0145447 0.0147983 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62791e-07 ( -6.35395e-08 7.1088e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 96.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.55267 ( -3.7083 -2.00348 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 26.8610 ( -7.69033 8.66389 )
Norm@50keV : 3.64425 ( -1.30196 75.0727 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.44 using 59 PHA bins.
# Reduced chi-squared = 1.644 for 55 degrees of freedom
# Null hypothesis probability = 1.838797e-03
Photon flux (15-150 keV) in 96 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67502e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.73632 (-1.92379 2.41079)
R^2/D10^2 : 0.100826 (-0.100829 0.302953)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.59 using 59 PHA bins.
# Reduced chi-squared = 1.589 for 57 degrees of freedom
# Null hypothesis probability = 3.076158e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.769e-08 4.149e-08
25- 50 8.595e-08 5.554e-08
50-150 1.237e-08 1.029e-08
15-150 1.660e-07 1.042e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.5729 (-12.0052 28.9967)
Norm : 0.393981 (-0.206104 0.460146)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 92.74 using 59 PHA bins.
# Reduced chi-squared = 1.627 for 57 degrees of freedom
# Null hypothesis probability = 1.941167e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.849e-08 4.416e-08
25- 50 6.942e-08 4.601e-08
50-150 2.878e-08 2.615e-08
15-150 1.667e-07 1.096e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.81918 (-6.79257 -6.79257)
R1^2/D10^2 : 5.02965E-02 (-0.0504614 -0.0504614)
kT2 [keV] : 6.66646 (-6.7108 -6.7108)
R2^2/D10^2 : 5.00547E-02 (-0.0503045 -0.0503045)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.59 using 59 PHA bins.
# Reduced chi-squared = 1.647 for 55 degrees of freedom
# Null hypothesis probability = 1.782328e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.759e-08 1.518e-01
25- 50 8.607e-08 1.346e+00
50-150 1.247e-08 3.536e+01
15-150 1.661e-07 3.333e+01
Plot creation:
Mon Feb 8 18:48:36 EST 2016