batgrbproduct analysis for trigger=933276
batgrbproduct Analysis for Trigger=933276
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): Wed Nov 6 11:10:29 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger933276/GCN5_download_cron
======================================================================
Trigger: 00933276 Segment: 000
BAT Trigger Time: 594605361.98 [s; MET]
Trigger Stop: 594605362.012 [s; MET]
UTC: 2019-11-05T00:08:58.113480 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 293.742937208376 Dec: 21.9150374428366 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 15.03
Image Trigger?: NO
Rate S/N Ratio: 107.962956610126 [ if not an image trigger ]
Image S/N Ratio: 15.03
Flight Position: [ source = BAT ]
RA: 293.742937208376 Dec: 21.9150374428366 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 293.743369210987 Dec: 21.9029009835974 [deg; J2000]
{ 19h 34m 58.4s , +21d 54' 10.4" }
+/- 1.3277718985611 [arcmin] (estimated 90% radius based on SNR)
+/- 0.43833388786049 [arcmin] (formal 1-sigma fit error)
SNR: 20.2874613052206
Angular difference between Flight and Ground position is 0.728585 arcmin
Partial Coding Fraction: 0.3242188 [ including projection effects ]
Duration
T90: 0.192000031471252 +/- 0.0320000648498535
Measured from: -0.0119998455047607
to: 0.180000185966492 [s; relative to TRIGTIME]
T50: 0.0480000972747803 +/- 0.0160000324249268
Measured from: 0.00400006771087646
to: 0.0520001649856567 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.391999959945679
to: 0.608000040054321 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0119999647140503
to: 0.212000012397766 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.250090 0.192137 0.054076 -0.003530
0.014798 0.013074 0.007819 0.005042 [error]
Peak 0.265775 0.212918 0.050665 -0.011772
0.017729 0.016587 0.012245 0.010081 [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 9.08e-08 4.00e-08 1.06e-08 3.45e-09 1.43e-07 1.45e-07 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 2.99e+00 1.54e+00 4.89e-01 1.99e-01 5.13e+00 5.22e+00 ph/cm2/s
Error 3.50e-01 1.50e-01 9.10e-02 6.63e-02 4.72e-01 4.77e-01 ph/cm2/s
Fluence Cutoff-PL 7.85e-08 8.96e-08 2.70e-08 1.29e-09 1.96e-07 1.96e-07 erg/cm2
Error 1.01e-08 8.82e-09 5.51e-09 7.38e-10 1.59e-08 1.59e-08 erg/cm2
Peak flux Cutoff-PL 2.75e+00 1.78e+00 3.99e-01 2.62e-02 4.95e+00 4.96e+00 ph/cm2/s
Error 3.92e-01 2.05e-01 1.19e-01 4.11e-02 4.79e-01 4.81e-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 3.923 0.000 - - 3.07e-02 0.00e+00 179.830 57
CPL 1.000 0.000 50.0 0.0 2.42e-02 0.00e+00 458.190 56
The chi2 of BB fit is 76.09 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.653 0.187 - - 2.37e-02 3.39e-03 67.800 57
CPL 1.117 0.907 20.5 12.4 2.21e-01 5.50e-01 57.950 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 0.224 -0.012 0.212
T90 0.192 -0.012 0.180
T50 0.048 0.004 0.052
Peak 1.000 -0.392 0.608
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
293.7434 +21.9029 0.0095 33.5 112.5 0.5067 20.3 TRIG_00933276
------------------------------------------
Foreground time interval of the image:
-0.012 0.212 (delta_t = 0.224 [sec])
Background time interval of the image:
-239.980 -112.580 (delta_t = 127.400 [sec])
-111.980 -0.012 (delta_t = 111.968 [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 -0.012 sec. to 0.212 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.92317 ( )
Norm@50keV : 3.07297E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 179.83 using 59 PHA bins.
# Reduced chi-squared = 3.1550 for 57 degrees of freedom
# Null hypothesis probability = 1.194829e-14
Photon flux (15-150 keV) in 0.224 sec: 17.7239 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4347e-07 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.012 sec. to 0.212 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.41989E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 458.19 using 59 PHA bins.
# Reduced chi-squared = 8.1820 for 56 degrees of freedom
# Null hypothesis probability = 1.749220e-64
Photon flux (15-150 keV) in 0.224 sec: 20.0420 ( -1.7425 1.7493 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.96386e-07 ( -1.58691e-08 1.58455e-08 ) ergs/cm2
Band function
Time interval is from -0.012 sec. to 0.212 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.63517 ( )
beta : -3.92412 ( )
Epeak [keV] : 11.9120 ( )
Norm@50keV : 4.17374 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 179.83 using 59 PHA bins.
# Reduced chi-squared = 3.2697 for 55 degrees of freedom
# Null hypothesis probability = 3.597481e-15
Photon flux (15-150 keV) in 0.224 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] : 7.24254 (-0.599912 0.63939)
R^2/D10^2 : 33.9944 (-10.6661 15.908)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.09 using 59 PHA bins.
# Reduced chi-squared = 1.335 for 57 degrees of freedom
# Null hypothesis probability = 4.635443e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.638e-08 8.467e-09
25- 50 9.703e-08 9.363e-09
50-150 1.816e-08 4.812e-09
15-150 1.816e-07 1.661e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.8604 (-1.71982 1.59759)
Norm : 245.467 (-30.3802 35.7255)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.07 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 57 degrees of freedom
# Null hypothesis probability = 1.496964e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.830e-08 8.770e-09
25- 50 7.984e-08 6.899e-09
50-150 2.564e-08 4.377e-09
15-150 1.938e-07 1.523e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.04180 (-0.969722 1.07627)
R1^2/D10^2 : 252.231 (-158.712 649.033)
kT2 [keV] : 9.83275 (-1.23348 1.1008)
R2^2/D10^2 : 6.25184 (-3.22662 7.48559)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.21 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 55 degrees of freedom
# Null hypothesis probability = 3.931358e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.144e-08 3.286e-08
25- 50 8.663e-08 2.911e-08
50-150 3.332e-08 1.402e-08
15-150 2.014e-07 6.587e-08
Peak spectrum fit
Power-law model
Time interval is from -0.392 sec. to 0.608 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.65256 ( -0.180881 0.193177 )
Norm@50keV : 2.37168E-02 ( -0.00339678 0.00338009 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.80 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 57 degrees of freedom
# Null hypothesis probability = 1.549397e-01
Photon flux (15-150 keV) in 1 sec: 5.13076 ( -0.471725 0.471969 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.48267e-07 ( -2.54648e-08 2.58494e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.392 sec. to 0.608 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11695 ( -1.06068 0.753406 )
Epeak [keV] : 20.5244 ( -17.7702 7.03671 )
Norm@50keV : 0.221275 ( -0.22127 0.879159 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.95 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 56 degrees of freedom
# Null hypothesis probability = 4.033159e-01
Photon flux (15-150 keV) in 1 sec: 4.95387 ( -0.47921 0.47979 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26629e-07 ( -2.4374e-08 2.5951e-08 ) ergs/cm2
Band function
Time interval is from -0.392 sec. to 0.608 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11420 ( -0.801454 1.64745 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 20.5442 ( -7.86854 7.07327 )
Norm@50keV : 0.222181 ( -0.22217 0.87986 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.95 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 55 degrees of freedom
# Null hypothesis probability = 3.671174e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26917e-07 ( -2.2691e-07 -2.4338e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.28157 (-0.697334 0.763957)
R^2/D10^2 : 8.12553 (-2.84556 4.45066)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.35 using 59 PHA bins.
# Reduced chi-squared = 1.252 for 57 degrees of freedom
# Null hypothesis probability = 9.569387e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.197e-08 1.037e-08
25- 50 1.063e-07 1.334e-08
50-150 2.027e-08 6.465e-09
15-150 1.985e-07 2.240e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 28.4502 (-4.8973 6.17874)
Norm : 43.3097 (-7.89492 9.9925)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.12 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 57 degrees of freedom
# Null hypothesis probability = 4.337056e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.570e-08 1.064e-08
25- 50 9.503e-08 9.880e-09
50-150 4.849e-08 1.432e-08
15-150 2.292e-07 2.450e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.15146 (-1.23909 1.34567)
R1^2/D10^2 : 55.7316 (-36.8986 218.489)
kT2 [keV] : 10.7396 (-2.10258 3.3798)
R2^2/D10^2 : 1.07157 (-0.821572 1.63521)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.64 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 55 degrees of freedom
# Null hypothesis probability = 4.134774e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.620e-08 4.398e-08
25- 50 9.468e-08 4.860e-08
50-150 4.539e-08 2.646e-08
15-150 2.263e-07 1.154e-07
Plot creation:
Wed Nov 6 11:15:00 EST 2019