batgrbproduct analysis for trigger=785917
batgrbproduct Analysis for Trigger=785917
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): Sun Nov 5 02:25:52 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger785917/GCN5_download_cron
======================================================================
Trigger: 00785917 Segment: 000
BAT Trigger Time: 531467457.332 [s; MET]
Trigger Stop: 531467457.396 [s; MET]
UTC: 2017-11-04T05:50:37.386160 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 40.9076314334273 Dec: 61.4540434321623 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 12.23
Image Trigger?: NO
Rate S/N Ratio: 14.8323969741913 [ if not an image trigger ]
Image S/N Ratio: 12.23
Flight Position: [ source = BAT ]
RA: 40.9076314334273 Dec: 61.4540434321623 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 40.9469023553163 Dec: 61.4301988645758 [deg; J2000]
{ 02h 43m 47.3s , +61d 25' 48.7" }
+/- 0.560601044940019 [arcmin] (estimated 90% radius based on SNR)
+/- 0.110339665733692 [arcmin] (formal 1-sigma fit error)
SNR: 69.5319217801594
Angular difference between Flight and Ground position is 1.820880 arcmin
Partial Coding Fraction: 0.7734375 [ including projection effects ]
Duration
T90: 934.77999997139 +/- 4.61169991126606
Measured from: -41.4799998998642
to: 893.300000071526 [s; relative to TRIGTIME]
T50: 521.271999955177 +/- 1.17293479666991
Measured from: 127.764000117779
to: 649.036000072956 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 540.407999992371
to: 541.407999992371 [s; relative to TRIGTIME]
Total Fluence
Measured from: -90.0680000185966
to: 962.715999960899 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 165.086865 114.058886 23.389228 0.458772
0.273058 0.254138 0.184633 0.147092 [error]
Peak 0.409230 0.362414 0.114461 0.000426
0.010983 0.010674 0.007158 0.004355 [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 7.64e-05 4.55e-05 1.73e-05 8.72e-06 1.44e-04 1.48e-04 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 4.73e+00 2.55e+00 8.57e-01 3.74e-01 8.34e+00 8.51e+00 ph/cm2/s
Error 2.86e-01 1.03e-01 5.88e-02 4.81e-02 3.67e-01 3.65e-01 ph/cm2/s
Fluence Cutoff-PL 5.18e-05 4.85e-05 1.79e-05 2.27e-06 1.20e-04 1.21e-04 erg/cm2
Error 2.64e-06 8.63e-07 3.52e-07 2.52e-07 3.18e-06 3.22e-06 erg/cm2
Peak flux Cutoff-PL 3.99e+00 2.85e+00 8.23e-01 9.12e-02 7.75e+00 7.76e+00 ph/cm2/s
Error 3.42e-01 1.34e-01 7.28e-02 3.84e-02 3.95e-01 3.99e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.99e+00 2.86e+00 8.23e-01 9.10e-02 7.74e+00 7.75e+00 ph/cm2/s
Error 3.25e-01 1.27e-01 7.05e-02 -------- 3.73e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.398 0.000 - - 9.23e-03 0.00e+00 446.860 57
CPL 1.638 0.170 9.8 3.7 6.96e-02 1.34e-02 29.950 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.571 0.079 - - 4.06e-02 2.12e-03 77.930 57
CPL 1.214 0.415 24.0 6.0 2.40e-01 1.41e-01 35.080 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: 925.248000 sec.
T50 in the 50-300 keV band: 512.256000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1052.780 -90.068 962.716
T90 934.780 -41.480 893.300
T50 521.272 127.764 649.036
Peak 1.000 540.408 541.408
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
40.9469 +61.4302 0.0028 18.0 -85.6 8.0796 69.5 TRIG_00785917
------------------------------------------
Foreground time interval of the image:
-15.231 12.369 (delta_t = 27.600 [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
-90.068000 132.788000
133.668000 962.716000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.39770 ( )
Norm@50keV : 9.22705E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 446.86 using 59 PHA bins.
# Reduced chi-squared = 7.8396 for 57 degrees of freedom
# Null hypothesis probability = 7.342222e-62
Photon flux (15-150 keV) in 1052 sec: 3.43736 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0.000143671 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-90.068000 132.788000
133.668000 962.716000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63807 ( -0.170655 0.16982 )
Epeak [keV] : 9.84840 ( -4.07988 3.40222 )
Norm@50keV : 6.95516E-02 ( -0.0120372 0.0147298 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 29.95 using 59 PHA bins.
# Reduced chi-squared = 0.5348 for 56 degrees of freedom
# Null hypothesis probability = 9.983230e-01
Photon flux (15-150 keV) in 1052 sec: 2.65307 ( -0.09386 0.0955 ) ph/cm2/s
Energy fluence (15-150 keV) : 0.000120211 ( -3.16021e-06 3.19913e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-90.068000 132.788000
133.668000 962.716000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.63942 ( -0.23876 0.128402 )
beta : -9.74984 ( 9.74984 19.7495 )
Epeak [keV] : 9.81551 ( -0.203131 3.45605 )
Norm@50keV : 6.94467E-02 ( -0.0119614 0.0148299 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 29.95 using 59 PHA bins.
# Reduced chi-squared = 0.5445 for 55 degrees of freedom
# Null hypothesis probability = 9.976595e-01
Photon flux (15-150 keV) in 1052 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] : 8.96512 ( )
R^2/D10^2 : 1.34138 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 677.23 using 59 PHA bins.
# Reduced chi-squared = 11.881 for 57 degrees of freedom
# Null hypothesis probability = 6.104473e-107
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.204e-05 6.522e-07
25- 50 4.656e-05 9.152e-07
50-150 1.755e-05 3.682e-07
15-150 8.614e-05 1.531e-06
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.2455 (-0.458386 0.471499)
Norm : 25.5862 (-0.988718 1.0224)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.19 using 59 PHA bins.
# Reduced chi-squared = 0.6349 for 57 degrees of freedom
# Null hypothesis probability = 9.857417e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.831e-05 1.304e-06
25- 50 4.854e-05 8.521e-07
50-150 1.972e-05 4.208e-07
15-150 1.166e-04 2.157e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.22137 (-0.290004 0.294955)
R1^2/D10^2 : 12.7953 (-2.82309 3.92558)
kT2 [keV] : 12.0385 (-0.446337 0.512152)
R2^2/D10^2 : 0.203904 (-0.0477383 0.0557043)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.88 using 59 PHA bins.
# Reduced chi-squared = 0.7252 for 55 degrees of freedom
# Null hypothesis probability = 9.375261e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.539e-05 2.730e-06
25- 50 4.894e-05 1.341e-06
50-150 1.955e-05 5.576e-07
15-150 1.139e-04 3.577e-06
Peak spectrum fit
Power-law model
Time interval is from 540.408 sec. to 541.408 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.57145 ( -0.0781897 0.0802045 )
Norm@50keV : 4.06031E-02 ( -0.00212423 0.00210887 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.93 using 59 PHA bins.
# Reduced chi-squared = 1.367 for 57 degrees of freedom
# Null hypothesis probability = 3.420721e-02
Photon flux (15-150 keV) in 1 sec: 8.33874 ( -0.366763 0.367904 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.14325e-07 ( -1.72128e-08 1.72379e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 540.408 sec. to 541.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21424 ( -0.435108 0.39544 )
Epeak [keV] : 23.9872 ( -7.4182 4.63325 )
Norm@50keV : 0.240111 ( -0.0964942 0.1857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.08 using 59 PHA bins.
# Reduced chi-squared = 0.6264 for 56 degrees of freedom
# Null hypothesis probability = 9.871604e-01
Photon flux (15-150 keV) in 1 sec: 7.74514 ( -0.39393 0.39606 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.80402e-07 ( -1.8562e-08 1.8804e-08 ) ergs/cm2
Band function
Time interval is from 540.408 sec. to 541.408 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21402 ( -0.286699 0.582265 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 23.9836 ( -7.41465 4.63138 )
Norm@50keV : 0.240171 ( -0.0965586 0.185865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.08 using 59 PHA bins.
# Reduced chi-squared = 0.6378 for 55 degrees of freedom
# Null hypothesis probability = 9.833451e-01
Photon flux (15-150 keV) in 1 sec: 7.74343 ( -0.74343 -0.38262 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79646e-07 ( -3.79639e-07 -1.8201e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.68011 (-0.368699 0.381971)
R^2/D10^2 : 6.02860 (-1.02103 1.23924)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 107.98 using 59 PHA bins.
# Reduced chi-squared = 1.8944 for 57 degrees of freedom
# Null hypothesis probability = 5.328633e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.669e-08 6.050e-09
25- 50 1.740e-07 7.450e-09
50-150 5.934e-08 6.710e-09
15-150 3.200e-07 1.355e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 35.1913 (-2.86722 3.19212)
Norm : 57.0440 (-4.79236 5.27447)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.35 using 59 PHA bins.
# Reduced chi-squared = 0.6203 for 57 degrees of freedom
# Null hypothesis probability = 9.891985e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.249e-07 6.750e-09
25- 50 1.550e-07 6.100e-09
50-150 1.036e-07 1.099e-08
15-150 3.835e-07 1.515e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.07333 (-0.758604 0.792182)
R1^2/D10^2 : 37.2185 (-15.5918 34.1464)
kT2 [keV] : 13.1325 (-1.50988 2.04835)
R2^2/D10^2 : 0.698439 (-0.370655 0.617424)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.00 using 59 PHA bins.
# Reduced chi-squared = 0.6181 for 55 degrees of freedom
# Null hypothesis probability = 9.883847e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.214e-07 2.047e-08
25- 50 1.538e-07 2.500e-08
50-150 1.004e-07 2.126e-08
15-150 3.757e-07 5.490e-08
Plot creation:
Sun Nov 5 02:48:27 EST 2017