batgrbproduct analysis for trigger=766081
batgrbproduct Analysis for Trigger=766081
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 Aug 4 08:24:18 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger766081/batgroup_hand_proc
======================================================================
Trigger: 00766081 Segment: 000
BAT Trigger Time: 523474246.644 [s; MET]
Trigger Stop: 523474246.708 [s; MET]
UTC: 2017-08-03T17:30:27.173280 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 174.949880933376 Dec: -16.3107712626632 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.73
Image Trigger?: NO
Rate S/N Ratio: 32.6036807738022 [ if not an image trigger ]
Image S/N Ratio: 10.73
Flight Position: [ source = BAT ]
RA: 174.949880933376 Dec: -16.3107712626632 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 174.946586554506 Dec: -16.3116250362 [deg; J2000]
{ 11h 39m 47.2s , -16d 18' 41.9" }
+/- 0.774294954389637 [arcmin] (estimated 90% radius based on SNR)
+/- 0.262106307051478 [arcmin] (formal 1-sigma fit error)
SNR: 43.8352493257324
Angular difference between Flight and Ground position is 0.196502 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 3.81599998474121 +/- 0.233649318060114
Measured from: -0.180000007152557
to: 3.63599997758865 [s; relative to TRIGTIME]
T50: 1.60799992084503 +/- 0.096166528707193
Measured from: 0.216000020503998
to: 1.82399994134903 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.11599999666214
to: 0.88400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.691999971866608
to: 4.14399999380112 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.354844 0.589780 0.491442 0.100944
0.016030 0.017189 0.015593 0.011495 [error]
Peak 0.161465 0.295090 0.290162 0.069509
0.008432 0.010057 0.009911 0.006551 [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 1.21e-07 2.37e-07 3.63e-07 1.21e-06 1.02e-06 1.93e-06 erg/cm2
Error 7.84e-09 9.24e-09 1.51e-08 1.11e-07 3.77e-08 1.21e-07 erg/cm2
Peak flux Power-law 1.70e+00 2.06e+00 1.81e+00 2.72e+00 6.52e+00 8.29e+00 ph/cm2/s
Error 1.24e-01 9.25e-02 7.74e-02 2.43e-01 2.56e-01 3.29e-01 ph/cm2/s
Fluence Cutoff-PL 1.02e-07 2.50e-07 3.87e-07 5.15e-07 9.75e-07 1.25e-06 erg/cm2
Error 9.91e-09 1.06e-08 1.79e-08 1.46e-07 4.10e-08 1.48e-07 erg/cm2
Peak flux Cutoff-PL 1.45e+00 2.14e+00 1.95e+00 1.55e+00 6.36e+00 7.09e+00 ph/cm2/s
Error 1.56e-01 1.03e-01 9.92e-02 3.50e-01 2.63e-01 4.39e-01 ph/cm2/s
Fluence Band 1.01e-07 2.49e-07 3.86e-07 5.32e-07 9.75e-07 1.27e-06 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 1.388 0.060 - - 2.17e-02 7.47e-04 71.100 57
CPL 0.650 0.281 100.2 20.5 4.75e-02 1.41e-02 47.530 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.191 0.064 - - 5.57e-02 2.11e-03 66.690 57
CPL 0.548 0.281 128.5 37.4 1.09e-01 3.13e-02 49.100 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: 3.520000 sec.
T50 in the 50-300 keV band: 1.280000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 4.836 -0.692 4.144
T90 3.816 -0.180 3.636
T50 1.608 0.216 1.824
Peak 1.000 -0.116 0.884
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
174.9466 -16.3116 0.0044 26.3 -9.8 1.5421 43.8 TRIG_00766081
------------------------------------------
Foreground time interval of the image:
-0.692 4.144 (delta_t = 4.836 [sec])
Background time interval of the image:
-18.943 -0.692 (delta_t = 18.251 [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 -0.692 sec. to 4.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38831 ( -0.0602939 0.0603414 )
Norm@50keV : 2.16865E-02 ( -0.000746749 0.000746716 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.10 using 59 PHA bins.
# Reduced chi-squared = 1.247 for 57 degrees of freedom
# Null hypothesis probability = 9.908809e-02
Photon flux (15-150 keV) in 4.836 sec: 2.63409 ( -0.0960883 0.0962669 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01583e-06 ( -3.7615e-08 3.76933e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.692 sec. to 4.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.650266 ( -0.289091 0.271911 )
Epeak [keV] : 100.165 ( -14.0344 26.9796 )
Norm@50keV : 4.75135E-02 ( -0.0116489 0.0165516 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.53 using 59 PHA bins.
# Reduced chi-squared = 0.8487 for 56 degrees of freedom
# Null hypothesis probability = 7.826335e-01
Photon flux (15-150 keV) in 4.836 sec: 2.52796 ( -0.10214 0.10267 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.75489e-07 ( -4.09899e-08 4.09126e-08 ) ergs/cm2
Band function
Time interval is from -0.692 sec. to 4.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.655973 ( -0.26545 0.202732 )
beta : -9.37062 ( 9.37157 19.3716 )
Epeak [keV] : 100.633 ( -9.14403 26.2911 )
Norm@50keV : 4.71892E-02 ( -0.0108949 0.00570089 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.53 using 59 PHA bins.
# Reduced chi-squared = 0.8642 for 55 degrees of freedom
# Null hypothesis probability = 7.527078e-01
Photon flux (15-150 keV) in 4.836 sec: 2.52888 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.74875e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.3051 ( )
R^2/D10^2 : 0.189260 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 145.94 using 59 PHA bins.
# Reduced chi-squared = 2.5604 for 57 degrees of freedom
# Null hypothesis probability = 9.711963e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.554e-08 3.772e-09
25- 50 2.492e-07 1.095e-08
50-150 5.358e-07 3.240e-08
15-150 8.406e-07 3.143e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-7.59394 -200)
Norm : 11.0027 (-0.379526 0.379526)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.35 using 59 PHA bins.
# Reduced chi-squared = 1.427 for 57 degrees of freedom
# Null hypothesis probability = 1.879428e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.325e-07 5.247e-09
25- 50 2.549e-07 9.164e-09
50-150 5.591e-07 1.959e-08
15-150 9.466e-07 3.288e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.76169 (-1.48128 1.65305)
R1^2/D10^2 : 1.42319 (-0.599215 1.39094)
kT2 [keV] : 24.8449 (-2.75197 4.2564)
R2^2/D10^2 : 4.39169E-02 (-0.0204087 0.0261558)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.19 using 59 PHA bins.
# Reduced chi-squared = 0.9308 for 55 degrees of freedom
# Null hypothesis probability = 6.208316e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.609e-08 1.564e-08
25- 50 2.508e-07 2.626e-08
50-150 6.208e-07 6.795e-08
15-150 9.677e-07 9.841e-08
Peak spectrum fit
Power-law model
Time interval is from -0.116 sec. to 0.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19081 ( -0.063747 0.0636602 )
Norm@50keV : 5.56542E-02 ( -0.00210813 0.00210797 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.69 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 57 degrees of freedom
# Null hypothesis probability = 1.780955e-01
Photon flux (15-150 keV) in 1 sec: 6.52434 ( -0.255706 0.255928 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.66108e-07 ( -2.33782e-08 2.34222e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.116 sec. to 0.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.547585 ( -0.289347 0.272054 )
Epeak [keV] : 128.543 ( -23.2809 51.5088 )
Norm@50keV : 0.108535 ( -0.0260249 0.0365605 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.10 using 59 PHA bins.
# Reduced chi-squared = 0.8768 for 56 degrees of freedom
# Null hypothesis probability = 7.314665e-01
Photon flux (15-150 keV) in 1 sec: 6.36321 ( -0.26331 0.2636 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.52929e-07 ( -2.4601e-08 2.4534e-08 ) ergs/cm2
Band function
Time interval is from -0.116 sec. to 0.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.547605 ( -0.182012 0.530019 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 128.529 ( -18.4119 51.5055 )
Norm@50keV : 0.108531 ( -0.0260708 0.0365782 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.10 using 59 PHA bins.
# Reduced chi-squared = 0.8927 for 55 degrees of freedom
# Null hypothesis probability = 6.984316e-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] : 19.6574 ( )
R^2/D10^2 : 0.328619 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 135.74 using 59 PHA bins.
# Reduced chi-squared = 2.3814 for 57 degrees of freedom
# Null hypothesis probability = 2.267691e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.464e-08 1.775e-09
25- 50 1.214e-07 6.850e-09
50-150 3.467e-07 2.205e-08
15-150 4.927e-07 2.300e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 27.0982 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 147.31 using 59 PHA bins.
# Reduced chi-squared = 2.5845 for 57 degrees of freedom
# Null hypothesis probability = 6.288580e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.748e-08 2.895e-09
25- 50 1.298e-07 5.200e-09
50-150 2.847e-07 1.210e-08
15-150 4.820e-07 1.905e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.84382 (-1.45462 1.68587)
R1^2/D10^2 : 3.07213 (-1.32815 2.89264)
kT2 [keV] : 27.7757 (-2.89236 4.21012)
R2^2/D10^2 : 8.81328E-02 (-0.0357231 0.0440067)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.35 using 59 PHA bins.
# Reduced chi-squared = 0.8790 for 55 degrees of freedom
# Null hypothesis probability = 7.250144e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.481e-08 8.495e-09
25- 50 1.234e-07 1.580e-08
50-150 3.858e-07 4.405e-08
15-150 5.540e-07 5.905e-08
Plot creation:
Fri Aug 4 08:32:36 EDT 2017