batgrbproduct analysis for trigger=783479
batgrbproduct Analysis for Trigger=783479
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): Sat Oct 28 23:54:01 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger783479/batgroup_hand_proc
======================================================================
Trigger: 00783479 Segment: 000
BAT Trigger Time: 530785406.528 [s; MET]
Trigger Stop: 530785410.624 [s; MET]
UTC: 2017-10-27T08:23:06.622860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 61.6803931109227 Dec: -2.60607661453514 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.64
Image Trigger?: NO
Rate S/N Ratio: 19.4164878389476 [ if not an image trigger ]
Image S/N Ratio: 10.64
Flight Position: [ source = BAT ]
RA: 61.6803931109227 Dec: -2.60607661453514 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 61.6828325019643 Dec: -2.60134352669912 [deg; J2000]
{ 04h 06m 43.9s , -02d 36' 04.8" }
+/- 1.08397245082418 [arcmin] (estimated 90% radius based on SNR)
+/- 0.54707911111024 [arcmin] (formal 1-sigma fit error)
SNR: 27.1076778664962
Angular difference between Flight and Ground position is 0.319415 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 97.5559999346733 +/- 4.9988430358009
Measured from: 7.00800001621246
to: 104.563999950886 [s; relative to TRIGTIME]
T50: 29.7879999279976 +/- 1.30550831221641
Measured from: 43.7800000309944
to: 73.567999958992 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 62.3000000119209
to: 63.3000000119209 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.00800001621246
to: 129.98400002718 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.486135 4.639301 3.470780 0.746665
0.073281 0.075237 0.066436 0.054147 [error]
Peak 0.086481 0.147016 0.127915 0.027124
0.007278 0.008137 0.007311 0.005206 [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 1.05e-06 1.90e-06 2.64e-06 7.62e-06 7.58e-06 1.32e-05 erg/cm2
Error 4.82e-08 4.96e-08 7.16e-08 4.83e-07 1.75e-07 5.16e-07 erg/cm2
Peak flux Power-law 8.64e-01 9.90e-01 8.14e-01 1.12e+00 3.08e+00 3.79e+00 ph/cm2/s
Error 9.44e-02 6.72e-02 5.77e-02 1.63e-01 1.89e-01 2.38e-01 ph/cm2/s
Fluence Cutoff-PL 9.76e-07 1.93e-06 2.70e-06 5.28e-06 7.43e-06 1.09e-05 erg/cm2
Error 6.43e-08 5.29e-08 8.12e-08 1.14e-06 1.97e-07 1.15e-06 erg/cm2
Peak flux Cutoff-PL 7.39e-01 1.05e+00 8.77e-01 5.50e-01 2.99e+00 3.22e+00 ph/cm2/s
Error 1.16e-01 7.94e-02 7.05e-02 2.26e-01 1.96e-01 2.96e-01 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 1.528 0.043 - - 6.08e-03 1.34e-04 43.920 57
CPL 1.236 0.179 145.9 82.1 8.21e-03 1.50e-03 35.770 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.282 0.100 - - 2.59e-02 1.56e-03 58.260 57
CPL 0.536 0.470 103.9 47.6 5.92e-02 3.21e-02 49.530 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: 96.256000 sec.
T50 in the 50-300 keV band: 27.328000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 131.992 -2.008 129.984
T90 97.556 7.008 104.564
T50 29.788 43.780 73.568
Peak 1.000 62.300 63.300
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
61.6828 -2.6013 0.0071 17.7 37.5 2.2248 27.1 TRIG_00783479
------------------------------------------
Foreground time interval of the image:
-2.008 37.573 (delta_t = 39.581 [sec])
Background time interval of the image:
-254.627 -2.008 (delta_t = 252.619 [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 -2.008 sec. to 129.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52760 ( -0.0429343 0.0429631 )
Norm@50keV : 6.07997E-03 ( -0.000134096 0.000134096 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.92 using 59 PHA bins.
# Reduced chi-squared = 0.7706 for 57 degrees of freedom
# Null hypothesis probability = 8.979082e-01
Photon flux (15-150 keV) in 132 sec: 0.764793 ( -0.019131 0.0191995 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.58034e-06 ( -1.74549e-07 1.74738e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.008 sec. to 129.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23648 ( -0.182767 0.175712 )
Epeak [keV] : 145.922 ( -35.4166 128.865 )
Norm@50keV : 8.21454E-03 ( -0.00133285 0.0016607 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.77 using 59 PHA bins.
# Reduced chi-squared = 0.6387 for 56 degrees of freedom
# Null hypothesis probability = 9.839218e-01
Photon flux (15-150 keV) in 132 sec: 0.746189 ( -0.021753 0.021879 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.4319e-06 ( -1.9738e-07 1.96746e-07 ) ergs/cm2
Band function
Time interval is from -2.008 sec. to 129.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24886 ( -0.17283 0.152082 )
beta : -9.37038 ( 9.37166 19.3717 )
Epeak [keV] : 150.770 ( -19.7807 47.528 )
Norm@50keV : 8.10856E-03 ( -0.00132785 0.00164976 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.80 using 59 PHA bins.
# Reduced chi-squared = 0.6509 for 55 degrees of freedom
# Null hypothesis probability = 9.791254e-01
Photon flux (15-150 keV) in 132 sec: 0.746199 ( ) 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] : 16.8607 ( )
R^2/D10^2 : 5.50244E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 390.96 using 59 PHA bins.
# Reduced chi-squared = 6.8589 for 57 degrees of freedom
# Null hypothesis probability = 2.612334e-51
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.215e-07 1.914e-08
25- 50 1.852e-06 5.874e-08
50-150 3.750e-06 1.525e-07
15-150 6.024e-06 1.551e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-8.59027 -200)
Norm : 3.11714 (-0.0687371 0.0687371)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.05 using 59 PHA bins.
# Reduced chi-squared = 0.7377 for 57 degrees of freedom
# Null hypothesis probability = 9.308129e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.025e-06 2.699e-08
25- 50 1.971e-06 5.082e-08
50-150 4.324e-06 1.049e-07
15-150 7.320e-06 1.894e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.11163 (-0.681626 0.736466)
R1^2/D10^2 : 0.688269 (-0.198976 0.306528)
kT2 [keV] : 25.9474 (-1.86635 2.33673)
R2^2/D10^2 : 9.95156E-03 (-0.00273936 0.00325078)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.57 using 59 PHA bins.
# Reduced chi-squared = 0.7740 for 55 degrees of freedom
# Null hypothesis probability = 8.893894e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.007e-07 7.953e-08
25- 50 1.929e-06 9.174e-08
50-150 4.504e-06 2.455e-07
15-150 7.334e-06 3.036e-07
Peak spectrum fit
Power-law model
Time interval is from 62.300 sec. to 63.300 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28214 ( -0.100231 0.100112 )
Norm@50keV : 2.58605E-02 ( -0.00155725 0.00155684 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.26 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 57 degrees of freedom
# Null hypothesis probability = 4.286517e-01
Photon flux (15-150 keV) in 1 sec: 3.07531 ( -0.18924 0.189421 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5668e-07 ( -1.71075e-08 1.71788e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 62.300 sec. to 63.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.535580 ( -0.494868 0.444284 )
Epeak [keV] : 103.891 ( -22.2865 72.9985 )
Norm@50keV : 5.92292E-02 ( -0.0226304 0.0415904 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.53 using 59 PHA bins.
# Reduced chi-squared = 0.8845 for 56 degrees of freedom
# Null hypothesis probability = 7.165986e-01
Photon flux (15-150 keV) in 1 sec: 2.99117 ( -0.19616 0.19587 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46088e-07 ( -1.854e-08 1.8538e-08 ) ergs/cm2
Band function
Time interval is from 62.300 sec. to 63.300 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.441623 ( -0.503928 0.957248 )
beta : -1.88157 ( 1.90195 0.454115 )
Epeak [keV] : 94.9986 ( -38.5398 66.2135 )
Norm@50keV : 6.69228E-02 ( -0.0302027 0.200796 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.95 using 59 PHA bins.
# Reduced chi-squared = 0.8900 for 55 degrees of freedom
# Null hypothesis probability = 7.036673e-01
Photon flux (15-150 keV) in 1 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] : 17.4501 (-1.21023 1.32403)
R^2/D10^2 : 0.224931 (-0.0495469 0.0622183)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.64 using 59 PHA bins.
# Reduced chi-squared = 1.415 for 57 degrees of freedom
# Null hypothesis probability = 2.135217e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.384e-08 1.550e-09
25- 50 6.253e-08 5.035e-09
50-150 1.370e-07 1.505e-08
15-150 2.134e-07 1.590e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-13.8349 -200)
Norm : 12.7526 (-0.773719 0.773719)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.93 using 59 PHA bins.
# Reduced chi-squared = 1.279 for 57 degrees of freedom
# Null hypothesis probability = 7.594486e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.176e-08 2.080e-09
25- 50 6.110e-08 4.750e-09
50-150 1.340e-07 3.056e-08
15-150 2.269e-07 3.320e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.22059 (-2.27544 3.8291)
R1^2/D10^2 : 1.91005 (-1.24716 4.87395)
kT2 [keV] : 23.9460 (-3.77861 12.3841)
R2^2/D10^2 : 6.41204E-02 (-0.0509414 0.0439442)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.19 using 59 PHA bins.
# Reduced chi-squared = 0.9308 for 55 degrees of freedom
# Null hypothesis probability = 6.208636e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.303e-08 9.636e-09
25- 50 6.021e-08 1.887e-08
50-150 1.592e-07 4.035e-08
15-150 2.425e-07 6.190e-08
Plot creation:
Sun Oct 29 00:08:54 EDT 2017