batgrbproduct analysis for trigger=811235
batgrbproduct Analysis for Trigger=811235
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 20:35:35 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger811235/GCN5_download_cron
======================================================================
Trigger: 00811235 Segment: 000
BAT Trigger Time: 540997824.064 [s; MET]
Trigger Stop: 540997826.112 [s; MET]
UTC: 2018-02-22T13:10:03.545680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 256.571083609051 Dec: -36.8026566389767 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.78
Image Trigger?: NO
Rate S/N Ratio: 14.9666295470958 [ if not an image trigger ]
Image S/N Ratio: 7.78
Flight Position: [ source = BAT ]
RA: 256.571083609051 Dec: -36.8026566389767 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 256.538816017176 Dec: -36.8191701862386 [deg; J2000]
{ 17h 06m 09.3s , -36d 49' 09.0" }
+/- 1.56386127593283 [arcmin] (estimated 90% radius based on SNR)
+/- 0.757952113141715 [arcmin] (formal 1-sigma fit error)
SNR: 16.058032888232
Angular difference between Flight and Ground position is 1.839655 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 48 +/- 22.6274169979695
Measured from: -15.0639998912811
to: 32.9360001087189 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 0.936000108718872
to: 16.9360001087189 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.43599998950958
to: 9.43599998950958 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.0640000104904
to: 32.9359999895096 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.325470 0.425492 0.381887 0.100304
0.045274 0.041138 0.035501 0.030704 [error]
Peak 0.003907 0.025594 0.020672 -0.005875
0.006558 0.006152 0.005317 0.004327 [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 8.55e-08 1.76e-07 2.82e-07 1.01e-06 7.82e-07 1.55e-06 erg/cm2
Error 1.59e-08 1.91e-08 3.41e-08 2.80e-07 8.44e-08 3.01e-07 erg/cm2
Peak flux Power-law 1.26e-01 1.41e-01 1.12e-01 1.48e-01 4.34e-01 5.27e-01 ph/cm2/s
Error 6.57e-02 4.78e-02 3.94e-02 1.05e-01 1.36e-01 1.65e-01 ph/cm2/s
Fluence Cutoff-PL 8.34e-08 1.78e-07 2.85e-07 8.33e-07 7.74e-07 1.36e-06 erg/cm2
Error 1.88e-08 2.13e-08 3.70e-08 4.91e-07 9.25e-08 4.99e-07 erg/cm2
Peak flux Cutoff-PL 6.68e-02 1.67e-01 1.34e-01 2.13e-02 3.87e-01 3.89e-01 ph/cm2/s
Error 7.56e-02 6.40e-02 5.41e-02 -------- 1.37e-01 1.44e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 7.72e-02 1.81e-01 1.13e-01 9.23e-02 4.12e-01 4.63e-01 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 1.318 0.180 - - 1.66e-03 1.60e-04 37.070 57
CPL 1.187 0.526 315.1 0.0 1.91e-03 1.54e-03 36.980 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.327 0.487 - - 3.62e-03 1.11e-03 45.180 57
CPL -1.611 3.917 63.1 52.2 9.33e-02 9.11e+00 41.330 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: 13.120000 sec.
T50 in the 50-300 keV band: 6.656000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 48.000 -15.064 32.936
T90 48.000 -15.064 32.936
T50 16.000 0.936 16.936
Peak 1.000 8.436 9.436
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
256.5388 -36.8192 0.0120 11.4 40.0 1.2203 16.1 TRIG_00811235
------------------------------------------
Foreground time interval of the image:
-15.064 27.637 (delta_t = 42.701 [sec])
Background time interval of the image:
-239.064 -53.494 (delta_t = 185.570 [sec])
-52.064 -15.064 (delta_t = 37.000 [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 -15.064 sec. to 32.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31801 ( -0.180256 0.178879 )
Norm@50keV : 1.65521E-03 ( -0.000159754 0.000159588 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.07 using 59 PHA bins.
# Reduced chi-squared = 0.6503 for 57 degrees of freedom
# Null hypothesis probability = 9.811877e-01
Photon flux (15-150 keV) in 48 sec: 0.198141 ( -0.0197974 0.0198855 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.81718e-07 ( -8.39755e-08 8.48078e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.064 sec. to 32.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18697 ( -0.759271 0.291957 )
Epeak [keV] : 315.127 ( -339.412 -339.412 )
Norm@50keV : 1.91170E-03 ( -0.000724809 0.00236395 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.98 using 59 PHA bins.
# Reduced chi-squared = 0.6604 for 56 degrees of freedom
# Null hypothesis probability = 9.766096e-01
Photon flux (15-150 keV) in 48 sec: 0.196707 ( -0.021269 0.020868 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.74389e-07 ( -9.46464e-08 9.03408e-08 ) ergs/cm2
Band function
Time interval is from -15.064 sec. to 32.936 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.859776 ( 0.852359 0.852359 )
beta : -1.34757 ( 1.3476 0.20638 )
Epeak [keV] : 79.2797 ( -76.687 -76.687 )
Norm@50keV : 3.28639E-03 ( -0.0019266 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.98 using 59 PHA bins.
# Reduced chi-squared = 0.6724 for 55 degrees of freedom
# Null hypothesis probability = 9.704063e-01
Photon flux (15-150 keV) in 48 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] : 17.7268 (-2.23219 2.63415)
R^2/D10^2 : 1.28751E-02 (-0.00477135 0.0074405)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.18 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 57 degrees of freedom
# Null hypothesis probability = 4.317704e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.907e-08 7.922e-09
25- 50 1.786e-07 2.662e-08
50-150 4.058e-07 7.862e-08
15-150 6.234e-07 8.136e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-36.2551 -200)
Norm : 0.821795 (-0.0797443 0.0797443)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.99 using 59 PHA bins.
# Reduced chi-squared = 0.7367 for 57 degrees of freedom
# Null hypothesis probability = 9.316982e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.822e-08 5.386e-08
25- 50 1.889e-07 1.030e-07
50-150 4.144e-07 2.213e-07
15-150 7.015e-07 3.823e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.46892 (-2.12947 3.18169)
R1^2/D10^2 : 0.227369 (-0.163938 0.831271)
kT2 [keV] : 26.4376 (-5.79944 15.7283)
R2^2/D10^2 : 2.91201E-03 (-0.00228098 0.00275257)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.34 using 59 PHA bins.
# Reduced chi-squared = 0.6790 for 55 degrees of freedom
# Null hypothesis probability = 9.672484e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.355e-08 4.215e-08
25- 50 1.745e-07 6.317e-08
50-150 5.023e-07 2.571e-07
15-150 7.603e-07 2.945e-07
Peak spectrum fit
Power-law model
Time interval is from 8.436 sec. to 9.436 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32666 ( -0.490367 0.484283 )
Norm@50keV : 3.61752E-03 ( -0.00110663 0.00110501 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.18 using 59 PHA bins.
# Reduced chi-squared = 0.7926 for 57 degrees of freedom
# Null hypothesis probability = 8.709155e-01
Photon flux (15-150 keV) in 1 sec: 0.433892 ( -0.135337 0.136477 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.55078e-08 ( -1.15728e-08 1.18814e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.436 sec. to 9.436 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.61126 ( -5.22332 2.61099 )
Epeak [keV] : 63.0754 ( -16.0202 88.3777 )
Norm@50keV : 9.33200E-02 ( -0.0934228 18.1329 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.33 using 59 PHA bins.
# Reduced chi-squared = 0.7380 for 56 degrees of freedom
# Null hypothesis probability = 9.286240e-01
Photon flux (15-150 keV) in 1 sec: 0.387339 ( -0.133429 0.140814 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.02735e-08 ( -1.06036e-08 1.23663e-08 ) ergs/cm2
Band function
Time interval is from 8.436 sec. to 9.436 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.45665 ( -1.91885 -0.916385 )
beta : -9.99999 ( 9.99999 3.00019e-05 )
Epeak [keV] : 63.7577 ( -16.2754 87.752 )
Norm@50keV : 7.92556E-02 ( -0.0227248 3.0137 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.33 using 59 PHA bins.
# Reduced chi-squared = 0.7515 for 55 degrees of freedom
# Null hypothesis probability = 9.138445e-01
Photon flux (15-150 keV) in 1 sec: 0.411827 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.55574e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.3229 (-4.09715 5.9133)
R^2/D10^2 : 4.16591E-02 (-0.0416591 0.0716639)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.32 using 59 PHA bins.
# Reduced chi-squared = 0.7249 for 57 degrees of freedom
# Null hypothesis probability = 9.413261e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.284e-09 1.386e-09
25- 50 9.777e-09 5.800e-09
50-150 1.834e-08 1.202e-08
15-150 3.040e-08 1.628e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-119.961 -199.363)
Norm : 1.82500 (-0.554398 0.554398)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.93 using 59 PHA bins.
# Reduced chi-squared = 0.7882 for 57 degrees of freedom
# Null hypothesis probability = 8.766990e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.544e-09 2.817e-09
25- 50 8.742e-09 5.250e-09
50-150 1.917e-08 1.189e-08
15-150 3.246e-08 1.986e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.655477 (-0.381697 21.8601)
R1^2/D10^2 : 8.59104E+07 (-1.17706e+08 1.03688e+14)
kT2 [keV] : 16.3609 (-4.1449 6.02666)
R2^2/D10^2 : 4.11556E-02 (-0.0269397 0.0699073)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.32 using 59 PHA bins.
#Fit statistic : Chi-Squared = 41.18 using 59 PHA bins.
# Reduced chi-squared = 0.7513 for 55 degrees of freedom
# Reduced chi-squared = 0.7488 for 55 degrees of freedom
# Null hypothesis probability = 9.141021e-01
# Null hypothesis probability = 9.165398e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.283e-09 1.282e-02
25- 50 9.773e-09 9.905e-02
50-150 1.835e-08 2.721e+00
15-150 3.041e-08 3.122e+00
Plot creation:
Fri Feb 23 20:40:58 EST 2018