batgrbproduct analysis for trigger=811167
batgrbproduct Analysis for Trigger=811167
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 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Fri Feb 23 07:54:38 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger811167/GCN5_download_cron
======================================================================
Trigger: 00811167 Segment: 000
BAT Trigger Time: 540951648 [s; MET]
Trigger Stop: 540953200 [s; MET]
UTC: 2018-02-22T00:20:27.484460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 273.387010460856 Dec: -9.50084497408389 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.73
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.73
Flight Position: [ source = BAT ]
RA: 273.387010460856 Dec: -9.50084497408389 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 273.435909075088 Dec: -9.49309596394157 [deg; J2000]
{ 18h 13m 44.6s , -09d 29' 35.1" }
+/- 3.62602495252832 [arcmin] (estimated 90% radius based on SNR)
+/- 1.62469802457506 [arcmin] (formal 1-sigma fit error)
SNR: 4.82982660473305
Angular difference between Flight and Ground position is 2.930819 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 1552 +/-
Measured from: 0
to: 1552 [s; relative to TRIGTIME]
T50: 1552 +/-
Measured from: 0
to: 1552 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1552 second)
Measured from: 0
to: 1552 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1552 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.667770 2.004770 1.055219 0.018041
0.220017 0.208827 0.181178 0.173927 [error]
Peak 1.667770 2.004770 1.055219 0.018041
0.220017 0.208827 0.181178 0.173927 [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 4.98e-07 7.37e-07 8.14e-07 1.69e-06 2.57e-06 3.74e-06 erg/cm2
Error 9.94e-08 9.24e-08 1.79e-07 7.82e-07 4.00e-07 9.48e-07 erg/cm2
Peak flux Power-law 1.68e-02 1.37e-02 7.58e-03 6.15e-03 4.09e-02 4.43e-02 ph/cm2/s
Error 3.43e-03 1.73e-03 1.61e-03 2.63e-03 5.16e-03 5.63e-03 ph/cm2/s
Fluence Cutoff-PL 5.01e-07 7.38e-07 8.17e-07 1.55e-06 2.55e-06 3.60e-06 erg/cm2
Error 1.00e-07 9.25e-08 1.79e-07 1.08e-06 4.05e-07 1.18e-06 erg/cm2
Peak flux Cutoff-PL 1.70e-02 1.37e-02 7.48e-03 5.93e-03 4.09e-02 4.43e-02 ph/cm2/s
Error 3.48e-03 1.72e-03 1.61e-03 4.55e-03 5.17e-03 5.60e-03 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- 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 1.856 0.262 - - 2.90e-04 4.49e-05 47.100 57
CPL 2.209 0.522 81.9 0.0 1.93e-04 0.00e+00 46.580 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.856 0.262 - - 2.90e-04 4.49e-05 47.100 57
CPL 2.209 0.547 81.9 0.0 1.93e-04 0.00e+00 46.580 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 1552.000 0.000 1552.000
T90 1552.000 0.000 1552.000
T50 1552.000 0.000 1552.000
Peak 1552.000 0.000 1552.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
273.4359 -9.4931 0.0399 10.4 34.5 4.8468 4.8 TRIG_00811167
------------------------------------------
Foreground time interval of the image:
0.000 474.820 (delta_t = 474.820 [sec])
476.000 963.047 (delta_t = 487.047 [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
Multiple GTIs in the spectrum
tstart tstop
0.000000 474.820000
476.000000 963.046800
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85633 ( -0.254939 0.269977 )
Norm@50keV : 2.90061E-04 ( -4.57125e-05 4.40601e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.10 using 59 PHA bins.
# Reduced chi-squared = 0.8262 for 57 degrees of freedom
# Null hypothesis probability = 8.222802e-01
Photon flux (15-150 keV) in 961.9 sec: 4.08765E-02 ( -0.0051608 0.00516914 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56524e-06 ( -3.9388e-07 4.05918e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 474.820000
476.000000 963.046800
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.20922 ( -0.998161 0.0467883 )
Epeak [keV] : 81.8779 ( )
Norm@50keV : 1.93123E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.58 using 59 PHA bins.
# Reduced chi-squared = 0.8318 for 56 degrees of freedom
# Null hypothesis probability = 8.109784e-01
Photon flux (15-150 keV) in 961.9 sec: 4.09040E-02 ( -0.0052029 0.0051308 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55079e-06 ( -3.97871e-07 4.11645e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 474.820000
476.000000 963.046800
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50532 ( 1.50539 1.50539 )
beta : -1.85626 ( -0.270188 0.254687 )
Epeak [keV] : 16.2376 ( -16.2124 -16.2124 )
Norm@50keV : 6.89676E-04 ( -0.0004373 0.044722 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.10 using 59 PHA bins.
# Reduced chi-squared = 0.8563 for 55 degrees of freedom
# Null hypothesis probability = 7.669013e-01
Photon flux (15-150 keV) in 961.9 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] : 10.8855 (-1.69988 2.09441)
R^2/D10^2 : 1.33436E-02 (-0.00640455 0.0119799)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.35 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 57 degrees of freedom
# Null hypothesis probability = 2.093379e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.171e-07 7.291e-08
25- 50 8.846e-07 1.453e-07
50-150 5.873e-07 2.055e-07
15-150 1.789e-06 3.266e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 93.5529 (-36.7511 94.7664)
Norm : 0.180664 (-0.0315074 0.0436677)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.93 using 59 PHA bins.
# Reduced chi-squared = 0.8585 for 57 degrees of freedom
# Null hypothesis probability = 7.676785e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.539e-07 8.032e-08
25- 50 7.741e-07 1.325e-07
50-150 1.207e-06 6.524e-07
15-150 2.435e-06 6.892e-07
Double BB
R1^2/D10^2 : 146.365 (-143.351 697170)
kT2 [keV] : 12.9931 (-2.38436 63.9134)
R2^2/D10^2 : 6.48293E-03 (-0.00498358 0.00610697)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.69 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.67 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.65 using 59 PHA bins.
# Reduced chi-squared = 0.9034 for 55 degrees of freedom
# Reduced chi-squared = 0.9030 for 55 degrees of freedom
# Reduced chi-squared = 0.9028 for 55 degrees of freedom
# Null hypothesis probability = 6.771384e-01
# Null hypothesis probability = 6.779342e-01
# Null hypothesis probability = 6.783775e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.596e-07 1.669e-07
25- 50 7.599e-07 1.962e-07
50-150 8.426e-07 2.982e-07
15-150 2.062e-06 4.906e-07
Peak spectrum fit
Power-law model
Time interval is from 476.000 sec. to 963.047 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85633 ( -0.254939 0.269977 )
Norm@50keV : 2.90061E-04 ( -4.57125e-05 4.40601e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.10 using 59 PHA bins.
# Reduced chi-squared = 0.8262 for 57 degrees of freedom
# Null hypothesis probability = 8.222802e-01
Photon flux (15-150 keV) in 961.9 sec: 4.08765E-02 ( -0.0051608 0.00516914 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56524e-06 ( -3.9388e-07 4.05918e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 476.000 sec. to 963.047 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.20922 ( -0.998161 0.0960994 )
Epeak [keV] : 81.8779 ( )
Norm@50keV : 1.93123E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.58 using 59 PHA bins.
# Reduced chi-squared = 0.8318 for 56 degrees of freedom
# Null hypothesis probability = 8.109784e-01
Photon flux (15-150 keV) in 961.9 sec: 4.09040E-02 ( -0.0052029 0.0051308 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55079e-06 ( -3.97871e-07 4.11645e-07 ) ergs/cm2
Band function
Time interval is from 476.000 sec. to 963.047 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50532 ( 1.50539 1.50539 )
beta : -1.85626 ( -0.270188 0.254687 )
Epeak [keV] : 16.2376 ( -16.2124 -16.2124 )
Norm@50keV : 6.89676E-04 ( -0.0004373 0.044722 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.10 using 59 PHA bins.
# Reduced chi-squared = 0.8563 for 55 degrees of freedom
# Null hypothesis probability = 7.669013e-01
Photon flux (15-150 keV) in 961.9 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] : 10.8855 (-1.69988 2.09441)
R^2/D10^2 : 1.33436E-02 (-0.00640455 0.0119799)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.35 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 57 degrees of freedom
# Null hypothesis probability = 2.093379e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.171e-07 7.738e-08
25- 50 8.846e-07 1.647e-07
50-150 5.873e-07 2.030e-07
15-150 1.789e-06 3.405e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 93.5529 (-36.7511 94.7664)
Norm : 0.180664 (-0.0315074 0.0436677)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.93 using 59 PHA bins.
# Reduced chi-squared = 0.8585 for 57 degrees of freedom
# Null hypothesis probability = 7.676785e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.539e-07 8.181e-08
25- 50 7.741e-07 1.354e-07
50-150 1.207e-06 6.218e-07
15-150 2.435e-06 7.142e-07
Double BB
R1^2/D10^2 : 146.365 (-143.347 697193)
kT2 [keV] : 12.9931 (-2.38436 63.9134)
R2^2/D10^2 : 6.48293E-03 (-0.00498358 0.00610697)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.69 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.67 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.65 using 59 PHA bins.
# Reduced chi-squared = 0.9034 for 55 degrees of freedom
# Reduced chi-squared = 0.9030 for 55 degrees of freedom
# Reduced chi-squared = 0.9028 for 55 degrees of freedom
# Null hypothesis probability = 6.771384e-01
# Null hypothesis probability = 6.779342e-01
# Null hypothesis probability = 6.783775e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.596e-07 1.792e-07
25- 50 7.599e-07 2.234e-07
50-150 8.426e-07 3.118e-07
15-150 2.062e-06 5.209e-07
Plot creation:
Fri Feb 23 07:59:02 EST 2018