batgrbproduct analysis for trigger=808755
batgrbproduct Analysis for Trigger=808755
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 Feb 6 19:29:27 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger808755/GCN5_download_cron
======================================================================
Trigger: 00808755 Segment: 000
BAT Trigger Time: 539551652.392 [s; MET]
Trigger Stop: 539551652.456 [s; MET]
UTC: 2018-02-05T19:27:11.960700 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 251.749289969315 Dec: -45.85038787502 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.73
Image Trigger?: NO
Rate S/N Ratio: 22.4722050542442 [ if not an image trigger ]
Image S/N Ratio: 9.73
Flight Position: [ source = BAT ]
RA: 251.749289969315 Dec: -45.85038787502 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 251.81786016268 Dec: -45.8430547517579 [deg; J2000]
{ 16h 47m 16.3s , -45d 50' 35.0" }
+/- 5.16658063448282 [arcmin] (estimated 90% radius based on SNR)
+/- 3.2687363315199 [arcmin] (formal 1-sigma fit error)
SNR: 2.91243773174693
Angular difference between Flight and Ground position is 2.899457 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 365.248000025749 +/- 170.424027063214
Measured from: -114.52799987793
to: 250.72000014782 [s; relative to TRIGTIME]
T50: 365.248000025749 +/- 181.080769703374
Measured from: -114.52799987793
to: 250.72000014782 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 249.796000003815
to: 250.796000003815 [s; relative to TRIGTIME]
Total Fluence
Measured from: -114.527999997139
to: 250.72000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.097518 0.087331 0.132560 0.052920
0.135847 0.119700 0.097659 0.082902 [error]
Peak 0.047387 0.082200 0.025086 -0.001179
0.007804 0.007631 0.005560 0.004473 [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 1.83e-09 1.10e-08 5.72e-081.56e-08 1.33e-06 1.85e-077.28e-08 1.40e-06 erg/cm2
Error 2.33e-08 3.53e-08 7.38e-08 3.69e-06 2.12e-07 3.72e-06 erg/cm2
Peak flux Power-law 5.70e-01 4.10e-01 1.95e-01 1.31e-01 1.24e+00 1.31e+00 ph/cm2/s
Error 1.00e-01 5.63e-02 4.09e-02 4.89e-02 1.69e-01 1.79e-01 ph/cm2/s
Fluence Cutoff-PL 2.95e-09 1.43e-08 6.01e-08 1.03e-06 1.86e-07 1.08e-06 erg/cm2
Error 2.26e-08 4.42e-08 9.83e-08 5.46e-06 2.14e-07 4.06e-05 erg/cm2
Peak flux Cutoff-PL 4.28e-01 6.00e-01 1.66e-01 4.11e-03 1.20e+00 1.20e+00 ph/cm2/s
Error 1.15e-01 8.89e-02 5.69e-02 8.15e-03 1.66e-01 1.66e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 4.34e-01 5.94e-01 1.72e-01 5.15e-03 1.20e+00 1.20e+00 ph/cm2/s
Error 1.14e-01 8.81e-02 5.56e-02 -------- 1.61e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.371 0.000 - - 2.24e-05 4.60e-05 53.980 57
CPL -3.077 0.000 9999.2 0.0 8.40e-07 0.00e+00 53.830 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.069 0.213 - - 7.99e-03 1.33e-03 92.330 57
CPL -1.452 1.699 38.7 4.3 9.92e-01 8.98e+00 65.580 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 365.248 -114.528 250.720
T90 365.248 -114.528 250.720
T50 365.248 -114.528 250.720
Peak 1.000 249.796 250.796
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.8179 -45.8431 0.0663 1.1 -111.7 0.5225 2.9 TRIG_00808755
------------------------------------------
Foreground time interval of the image:
-114.528 -36.696 (delta_t = 77.832 [sec])
-35.392 7.509 (delta_t = 42.901 [sec])
Background time interval of the image:
-239.392 -114.528 (delta_t = 124.864 [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
Multiple GTIs in the spectrum
tstart tstop
-114.528000 -36.696100
-35.392000 55.168000
56.608000 250.720000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.371400 ( 0.376293 0.376293 )
Norm@50keV : 2.24433E-05 ( -2.23333e-05 6.96484e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.98 using 59 PHA bins.
# Reduced chi-squared = 0.9471 for 57 degrees of freedom
# Null hypothesis probability = 5.889885e-01
Photon flux (15-150 keV) in 362.5 sec: 3.52734E-03 8.75565E-04 ( -0.000935536 0.00959244 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02584e-19 ( -7.59579e-08 3.48009e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-114.528000 -36.696100
-35.392000 55.168000
56.608000 250.720000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.07672 ( 3.07562 3.07562 )
Epeak [keV] : 9999.17 ( -9999.13 -9999.13 )
Norm@50keV : 8.40383E-07 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.83 using 59 PHA bins.
# Reduced chi-squared = 0.9613 for 56 degrees of freedom
# Null hypothesis probability = 5.574374e-01
Photon flux (15-150 keV) in 362.5 sec: 3.74852E-03 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85678e-07 ( -1.85678e-07 2.43134e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-114.528000 -36.696100
-35.392000 55.168000
56.608000 250.720000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.151685 ( 0.1456 0.1456 )
beta : 0.374114 ( -0.378597 -0.378597 )
Epeak [keV] : 15.0792 ( -15.1554 -15.1554 )
Norm@50keV : 4.08995E-05 ( -4.09803e-05 85.55 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.98 using 59 PHA bins.
# Reduced chi-squared = 0.9815 for 55 degrees of freedom
# Null hypothesis probability = 5.135037e-01
Photon flux (15-150 keV) in 362.5 sec: 3.66981 ( 3.33019 -0.50012 ) 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] : 200.000 (-200 -200)
R^2/D10^2 : 1.79991E-06 (-1.79802e-06 -1.79802e-06)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.02 using 59 PHA bins.
# Reduced chi-squared = 0.9476 for 57 degrees of freedom
# Null hypothesis probability = 5.877793e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.766e-09 1.308e-09
25- 50 1.290e-08 9.635e-09
50-150 1.651e-07 1.183e-07
15-150 1.798e-07 1.064e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.349 (-199.356 -199.356)
Norm : 1.60040E-02 (-0.0160476 0.0299765)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.81 using 59 PHA bins.
# Reduced chi-squared = 0.9615 for 57 degrees of freedom
# Null hypothesis probability = 5.577544e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.279e-09 1.373e-11
25- 50 5.889e-11 0.000e+00
50-150 9.367e-16 0.000e+00
15-150 5.337e-09 1.241e-21
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.60598 (-1.55463 -1.55463)
R1^2/D10^2 : 13.4188 (-24.9486 -24.9486)
kT2 [keV] : 198.832 (-198.975 -198.975)
R2^2/D10^2 : 1.78003E-06 (-1.78299e-06 -1.78299e-06)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.06 using 59 PHA bins.
#Fit statistic : Chi-Squared = 53.94 using 59 PHA bins.
# Reduced chi-squared = 0.9830 for 55 degrees of freedom
# Reduced chi-squared = 0.9807 for 55 degrees of freedom
# Null hypothesis probability = 5.104278e-01
# Null hypothesis probability = 5.152312e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 249.796 sec. to 250.796 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06901 ( -0.207266 0.219343 )
Norm@50keV : 7.98818E-03 ( -0.0013341 0.00131978 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 92.33 using 59 PHA bins.
# Reduced chi-squared = 1.620 for 57 degrees of freedom
# Null hypothesis probability = 2.123607e-03
Photon flux (15-150 keV) in 1 sec: 1.23788 ( -0.169353 0.169447 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.39875e-08 ( -1.14676e-08 1.17112e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 249.796 sec. to 250.796 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.45200 ( -1.98029 1.41684 )
Epeak [keV] : 38.6729 ( -4.03889 4.65692 )
Norm@50keV : 0.992423 ( -1.22325 16.7407 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.58 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 56 degrees of freedom
# Null hypothesis probability = 1.787143e-01
Photon flux (15-150 keV) in 1 sec: 1.19785 ( -0.16505 0.16614 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.47656e-08 ( -9.3842e-09 9.9385e-09 ) ergs/cm2
Band function
Time interval is from 249.796 sec. to 250.796 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.55175 ( -1.21777 2.74334 )
beta : -10.0000 ( 10 2.30926e-14 )
Epeak [keV] : 38.6105 ( -4.04914 4.63498 )
Norm@50keV : 1.14031 ( -1.14018 16.8016 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.56 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 55 degrees of freedom
# Null hypothesis probability = 1.559229e-01
Photon flux (15-150 keV) in 1 sec: 1.20427 ( 5.79573 -0.16317 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.60642e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.93894 (-1.03724 1.1516)
R^2/D10^2 : 0.680438 (-0.241768 0.365714)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.64 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 57 degrees of freedom
# Null hypothesis probability = 2.023139e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.366e-08 2.695e-09
25- 50 3.367e-08 5.130e-09
50-150 1.726e-08 5.815e-09
15-150 6.459e-08 1.084e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 53.1463 (-13.2334 20.5073)
Norm : 7.16170 (-1.29988 1.59569)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.66 using 59 PHA bins.
# Reduced chi-squared = 1.398 for 57 degrees of freedom
# Null hypothesis probability = 2.539422e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.774e-08 2.950e-09
25- 50 2.603e-08 4.720e-09
50-150 2.674e-08 9.585e-09
15-150 7.051e-08 1.397e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.81002 (-7.67593 -7.67593)
R1^2/D10^2 : 0.260910 (-0.236 -0.236)
kT2 [keV] : 10.3494 (-10.2813 -10.2813)
R2^2/D10^2 : 0.499460 (-0.534404 -0.534404)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.63 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 55 degrees of freedom
# Null hypothesis probability = 1.545772e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.384e-08 8.650e-06
25- 50 3.346e-08 7.635e-05
50-150 1.769e-08 1.714e-03
15-150 6.500e-08 1.631e-03
Plot creation:
Tue Feb 6 19:35:35 EST 2018