batgrbproduct analysis for trigger=884906
batgrbproduct Analysis for Trigger=884906
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): Tue Jan 22 11:36:24 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger884906/GCN5_download_cron
======================================================================
Trigger: 00884906 Segment: 000
BAT Trigger Time: 569758040 [s; MET]
Trigger Stop: 569758104 [s; MET]
UTC: 2019-01-21T10:06:57.714500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 247.749497541048 Dec: -47.772513886198 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.18
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.18
Flight Position: [ source = BAT ]
RA: 247.749497541048 Dec: -47.772513886198 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 247.82705752032 Dec: -47.7537129942745 [deg; J2000]
{ 16h 31m 18.5s , -47d 45' 13.4" }
+/- 2.59109056119778 [arcmin] (estimated 90% radius based on SNR)
+/- 1.04751209136092 [arcmin] (formal 1-sigma fit error)
SNR: 7.80600746826595
Angular difference between Flight and Ground position is 3.325319 arcmin
Partial Coding Fraction: 1.015625 [ 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 0.422405 0.310436 0.181087 0.038328
0.058104 0.055160 0.047493 0.044702 [error]
Peak 0.422405 0.310436 0.181087 0.038328
0.058104 0.055160 0.047493 0.044702 [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 1.18e-07 1.42e-07 1.24e-07 1.85e-07 4.48e-07 5.68e-07 erg/cm2
Error 2.64e-08 2.52e-08 4.37e-08 1.29e-07 9.73e-08 1.81e-07 erg/cm2
Peak flux Power-law 6.01e-02 4.02e-02 1.75e-02 1.05e-02 1.23e-01 1.28e-01 ph/cm2/s
Error 1.38e-02 6.95e-03 5.97e-03 6.83e-03 2.03e-02 2.16e-02 ph/cm2/s
Fluence Cutoff-PL 1.18e-07 1.42e-07 1.24e-07 1.83e-07 4.48e-07 5.66e-07 erg/cm2
Error 2.64e-08 2.95e-08 4.59e-08 1.85e-07 1.03e-07 2.70e-07 erg/cm2
Peak flux Cutoff-PL 5.98e-02 4.03e-02 1.77e-02 1.07e-02 1.23e-01 1.28e-01 ph/cm2/s
Error 1.46e-02 6.87e-03 -------- 9.15e-03 2.04e-02 2.33e-02 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 5.93e-02 4.03e-02 1.79e-02 1.09e-02 1.23e-01 1.29e-01 ph/cm2/s
Error 1.47e-02 -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.197 0.369 - - 7.44e-04 1.89e-04 57.100 57
CPL 1.971 0.000 5.6 0.0 9.99e-04 0.00e+00 57.170 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.197 0.369 - - 7.44e-04 1.89e-04 57.100 57
CPL 1.971 0.000 5.6 0.0 9.99e-04 0.00e+00 57.170 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
247.8271 -47.7537 0.0245 10.0 -165.9 0.9062 7.8 TRIG_00884906
------------------------------------------
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: 2.19676 ( -0.3445 0.394453 )
Norm@50keV : 7.44328E-04 ( -0.000193122 0.00018459 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.712942e-01
Photon flux (15-150 keV) in 64 sec: 0.123017 ( -0.020337 0.0203372 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.47683e-07 ( -9.47955e-08 9.98784e-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: 1.97063 ( )
Epeak [keV] : 5.64301 ( )
Norm@50keV : 9.98691E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.17 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 56 degrees of freedom
# Null hypothesis probability = 4.313298e-01
Photon flux (15-150 keV) in 64 sec: 0.122975 ( -0.020468 0.02033 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.47636e-07 ( -1.07136e-07 9.87622e-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 : -9.99512 ( 9.99512 9.99512 )
beta : -2.19676 ( -0.394453 0.34496 )
Epeak [keV] : 9.54502 ( -9.54502 -9.54502 )
Norm@50keV : 0.101165 ( -0.026248 0.0250883 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 55 degrees of freedom
# Null hypothesis probability = 3.969198e-01
Photon flux (15-150 keV) in 64 sec: 0.122781 ( ) 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] : 8.85728 (-1.93864 2.44247)
R^2/D10^2 : 8.67693E-02 (-0.0524687 0.142283)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.58 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 57 degrees of freedom
# Null hypothesis probability = 1.399432e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.410e-08 3.000e-08
25- 50 1.743e-07 5.430e-08
50-150 6.331e-08 3.141e-08
15-150 3.217e-07 9.558e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 50.5852 (-19.8597 43.008)
Norm : 0.685393 (-0.181915 0.286412)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.21 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 57 degrees of freedom
# Null hypothesis probability = 4.305261e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.075e-07 2.486e-08
25- 50 1.551e-07 4.179e-08
50-150 1.522e-07 7.465e-08
15-150 4.149e-07 1.239e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.26496 (-1.72382 2.33294)
R1^2/D10^2 : 4.41260 (-4.03722 860.75)
kT2 [keV] : 14.2596 (-4.25341 8.11246)
R2^2/D10^2 : 1.13950E-02 (-0.00955467 0.0149)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.18 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 55 degrees of freedom
# Null hypothesis probability = 4.305513e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.189e-07 6.342e-08
25- 50 1.354e-07 7.472e-08
50-150 1.601e-07 1.006e-07
15-150 4.144e-07 2.150e-07
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: 2.19676 ( -0.3445 0.394453 )
Norm@50keV : 7.44328E-04 ( -0.000193122 0.00018459 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.712942e-01
Photon flux (15-150 keV) in 64 sec: 0.123017 ( -0.020337 0.0203372 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.47683e-07 ( -9.47955e-08 9.98784e-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: 1.97063 ( )
Epeak [keV] : 5.64301 ( )
Norm@50keV : 9.98691E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.17 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 56 degrees of freedom
# Null hypothesis probability = 4.313298e-01
Photon flux (15-150 keV) in 64 sec: 0.122975 ( -0.020468 0.02033 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.47636e-07 ( -1.07136e-07 9.87622e-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 : -9.99512 ( 9.99512 9.99512 )
beta : -2.19676 ( -0.394453 0.34496 )
Epeak [keV] : 9.54502 ( -9.54502 -9.54502 )
Norm@50keV : 0.101165 ( -0.026248 0.0250883 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 55 degrees of freedom
# Null hypothesis probability = 3.969198e-01
Photon flux (15-150 keV) in 64 sec: 0.122781 ( ) 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] : 8.85728 (-1.93864 2.44247)
R^2/D10^2 : 8.67693E-02 (-0.0524687 0.142283)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.58 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 57 degrees of freedom
# Null hypothesis probability = 1.399432e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.410e-08 2.861e-08
25- 50 1.743e-07 5.597e-08
50-150 6.331e-08 2.998e-08
15-150 3.217e-07 8.256e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 50.5852 (-19.8597 43.008)
Norm : 0.685393 (-0.181915 0.286412)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.21 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 57 degrees of freedom
# Null hypothesis probability = 4.305261e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.075e-07 2.675e-08
25- 50 1.551e-07 3.242e-08
50-150 1.522e-07 8.103e-08
15-150 4.149e-07 1.063e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.26496 (-1.72382 2.33294)
R1^2/D10^2 : 4.41260 (-4.03722 860.75)
kT2 [keV] : 14.2596 (-4.25341 8.11246)
R2^2/D10^2 : 1.13950E-02 (-0.00955467 0.0150375)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.18 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 55 degrees of freedom
# Null hypothesis probability = 4.305513e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.189e-07 6.403e-08
25- 50 1.354e-07 7.283e-08
50-150 1.601e-07 1.002e-07
15-150 4.144e-07 2.137e-07
Plot creation:
Tue Jan 22 11:41:01 EST 2019