batgrbproduct Analysis for Trigger=674752
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 Feb 21 12:57:26 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger674752/GCN5_download_cron
======================================================================
Trigger: 00674752 Segment: 000
BAT Trigger Time: 477668112 [s; MET]
Trigger Stop: 477668176 [s; MET]
UTC: 2016-02-20T13:34:56.130080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.195736392093 Dec: -32.9391756217063 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.89
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.89
Flight Position: [ source = BAT ]
RA: 267.195736392093 Dec: -32.9391756217063 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 267.165870272551 Dec: -32.9637067315399 [deg; J2000]
{ 17h 48m 39.8s , -32d 57' 49.3" }
+/- 3.44068460236964 [arcmin] (estimated 90% radius based on SNR)
+/- 2.08985355413685 [arcmin] (formal 1-sigma fit error)
SNR: 5.20574463359011
Angular difference between Flight and Ground position is 2.104161 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.174009 0.212353 0.023545 -0.024553
0.053683 0.047306 0.039297 0.034446 [error]
Peak 0.174009 0.212353 0.023545 -0.024553
0.053683 0.047306 0.039297 0.034446 [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 4.61e-08 5.96e-08 5.64e-08 9.42e-08 1.94e-07 2.56e-07 erg/cm2
Error 2.07e-08 2.12e-08 3.23e-08 1.22e-07 7.92e-08 1.51e-07 erg/cm2
Peak flux Power-law 2.35e-02 1.68e-02 7.96e-03 5.30e-03 5.09e-02 5.36e-02 ph/cm2/s
Error 1.07e-02 5.91e-03 4.42e-03 6.43e-03 1.78e-02 1.88e-02 ph/cm2/s
Fluence Cutoff-PL 3.55e-08 9.24e-08 1.33e-08 1.10e-11 1.41e-07 1.41e-07 erg/cm2
Error 2.40e-08 3.29e-08 2.66e-08 3.84e-09 5.12e-08 5.00e-08 erg/cm2
Peak flux Cutoff-PL 1.70e-02 2.65e-02 2.26e-03 1.01e-06 4.58e-02 4.58e-02 ph/cm2/s
Error 1.21e-02 9.20e-03 4.03e-03 3.14e-04 1.65e-02 1.65e-02 ph/cm2/s
Fluence Band 2.02e-07 1.28e-06 9.62e-07 3.33e-08 2.48e-06 2.47e-06 erg/cm2
Error -------- 1.21e-06 -------- -------- -------- -------- erg/cm2
Peak flux Band 1.84e-02 2.57e-02 3.32e-03 1.14e-04 4.76e-02 4.78e-02 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 2.076 0.614 - - 3.27e-04 1.43e-04 58.630 57
CPL -5.239 0.212 32.8 7.1 1.78e+01 1.25e+04 53.140 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.076 0.614 - - 3.27e-04 1.43e-04 58.630 57
CPL -5.239 0.212 32.8 7.1 1.78e+01 1.33e+04 53.140 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
267.1659 -32.9637 0.0368 16.2 -28.1 0.5377 5.2 TRIG_00674752
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.07619 ( -0.57746 0.650985 )
Norm@50keV : 3.27014E-04 ( -0.000143172 0.00014211 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.63 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.153815e-01
Photon flux (15-150 keV) in 64 sec: 5.08568E-02 ( -0.0177465 0.0177655 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93748e-07 ( -7.59302e-08 8.23789e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -5.23851 ( 5.25128 5.67429 )
Epeak [keV] : 32.8488 ( -6.11037 8.11114 )
Norm@50keV : 17.7621 ( -18.4661 25009.3 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.14 using 59 PHA bins.
# Reduced chi-squared = 0.9489 for 56 degrees of freedom
# Null hypothesis probability = 5.839803e-01
Photon flux (15-150 keV) in 64 sec: 4.57666E-02 ( -0.0161846 0.0168896 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41206e-07 ( -4.77517e-08 5.47123e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.86578 ( -5.2344 -4.86578 )
beta : -6.75713 ( 6.75713 16.1912 )
Epeak [keV] : 32.9331 ( -5.9591 6.91152 )
Norm@50keV : 10.1439 ( -3.16541 91.0172 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.07 using 59 PHA bins.
# Reduced chi-squared = 0.9650 for 55 degrees of freedom
# Null hypothesis probability = 5.485670e-01
Photon flux (15-150 keV) in 64 sec: 4.76115E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.48027e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.41163 (-1.96636 2.76114)
R^2/D10^2 : 5.14930E-02 (-0.051493 0.0986697)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.11 using 59 PHA bins.
# Reduced chi-squared = 0.9493 for 57 degrees of freedom
# Null hypothesis probability = 5.841627e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.366e-08 2.701e-08
25- 50 8.321e-08 5.021e-08
50-150 2.570e-08 2.074e-08
15-150 1.526e-07 9.846e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 45.9334 (-23.8048 103.663)
Norm : 0.312595 (-0.143216 0.26061)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.03 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 57 degrees of freedom
# Null hypothesis probability = 4.740271e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.790e-08 2.968e-08
25- 50 6.667e-08 4.179e-08
50-150 5.961e-08 5.024e-08
15-150 1.742e-07 1.163e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.996 (-199.996 -199.996)
R1^2/D10^2 : 7.35218E-07 (-7.35218e-07 -7.35218e-07)
kT2 [keV] : 8.30737 (-2.0026 2.81791)
R2^2/D10^2 : 5.35816E-02 (-0.0375942 0.0954071)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.11 using 59 PHA bins.
#Fit statistic : Chi-Squared = 54.07 using 59 PHA bins.
# Reduced chi-squared = 0.9838 for 55 degrees of freedom
# Reduced chi-squared = 0.9831 for 55 degrees of freedom
# Null hypothesis probability = 5.085697e-01
# Null hypothesis probability = 5.100667e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.352e-08 1.176e-01
25- 50 8.326e-08 9.328e-01
50-150 2.592e-08 2.164e+01
15-150 1.527e-07 2.264e+01
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.07619 ( -0.57746 0.650985 )
Norm@50keV : 3.27014E-04 ( -0.000143172 0.00014211 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.63 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.153815e-01
Photon flux (15-150 keV) in 64 sec: 5.08568E-02 ( -0.0177465 0.0177655 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93748e-07 ( -7.59302e-08 8.23789e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -5.23851 ( 5.25128 5.67429 )
Epeak [keV] : 32.8488 ( -6.11037 8.11114 )
Norm@50keV : 17.7621 ( -18.4661 26659.6 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.14 using 59 PHA bins.
# Reduced chi-squared = 0.9489 for 56 degrees of freedom
# Null hypothesis probability = 5.839803e-01
Photon flux (15-150 keV) in 64 sec: 4.57666E-02 ( -0.0161846 0.0168896 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41206e-07 ( -4.77517e-08 5.47123e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.86578 ( -5.2344 -4.86578 )
beta : -6.75713 ( 6.75713 16.1912 )
Epeak [keV] : 32.9331 ( -5.95908 6.91152 )
Norm@50keV : 10.1439 ( -3.16541 91.0172 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.07 using 59 PHA bins.
# Reduced chi-squared = 0.9650 for 55 degrees of freedom
# Null hypothesis probability = 5.485670e-01
Photon flux (15-150 keV) in 64 sec: 4.76115E-02 ( ) 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] : 8.41163 (-1.96636 2.76114)
R^2/D10^2 : 5.14930E-02 (-0.051493 0.0986697)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.11 using 59 PHA bins.
# Reduced chi-squared = 0.9493 for 57 degrees of freedom
# Null hypothesis probability = 5.841627e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.366e-08 2.699e-08
25- 50 8.321e-08 5.136e-08
50-150 2.570e-08 1.943e-08
15-150 1.526e-07 9.798e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 45.9334 (-23.8048 103.663)
Norm : 0.312595 (-0.143216 0.26061)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.03 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 57 degrees of freedom
# Null hypothesis probability = 4.740271e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.790e-08 2.943e-08
25- 50 6.667e-08 4.109e-08
50-150 5.961e-08 4.538e-08
15-150 1.742e-07 1.124e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.996 (-199.996 -199.996)
R1^2/D10^2 : 7.35218E-07 (-7.35218e-07 -7.35218e-07)
kT2 [keV] : 8.30737 (-2.0026 2.81791)
R2^2/D10^2 : 5.35816E-02 (-0.0375942 0.0954071)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.11 using 59 PHA bins.
#Fit statistic : Chi-Squared = 54.07 using 59 PHA bins.
# Reduced chi-squared = 0.9838 for 55 degrees of freedom
# Reduced chi-squared = 0.9831 for 55 degrees of freedom
# Null hypothesis probability = 5.085697e-01
# Null hypothesis probability = 5.100667e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.352e-08 1.152e-01
25- 50 8.326e-08 9.258e-01
50-150 2.592e-08 2.312e+01
15-150 1.527e-07 2.504e+01
Plot creation:
Sun Feb 21 13:01:59 EST 2016