batgrbproduct analysis for trigger=933285
batgrbproduct Analysis for Trigger=933285
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 11:05:24 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger933285/GCN5_download_cron
======================================================================
Trigger: 00933285 Segment: 000
BAT Trigger Time: 594610609.8 [s; MET]
Trigger Stop: 594610609.816 [s; MET]
UTC: 2019-11-05T01:36:25.933140 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 293.753346576888 Dec: 21.8962482555867 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 23.89
Image Trigger?: NO
Rate S/N Ratio: 255.998046867549 [ if not an image trigger ]
Image S/N Ratio: 23.89
Flight Position: [ source = BAT ]
RA: 293.753346576888 Dec: 21.8962482555867 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 293.73883754237 Dec: 21.90397525608 [deg; J2000]
{ 19h 34m 57.3s , +21d 54' 14.3" }
+/- 0.654738896514988 [arcmin] (estimated 90% radius based on SNR)
+/- 0.181271734420504 [arcmin] (formal 1-sigma fit error)
SNR: 55.7029475847236
Angular difference between Flight and Ground position is 0.931319 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.191999912261963 +/- 0.064
Measured from: -0.0559998750686646
to: 0.136000037193298 [s; relative to TRIGTIME]
T50: 0.0639998912811279 +/- 0.064
Measured from: -0.0559998750686646
to: 0.00800001621246338 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.331999897956848
to: 0.668000102043152 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0559999942779541
to: 0.392000079154968 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.459313 0.499336 0.127789 0.011392
0.011916 0.012316 0.007178 0.003490 [error]
Peak 0.452650 0.503662 0.128157 0.001341
0.012988 0.013312 0.008317 0.005236 [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 1.72e-07 1.62e-07 1.06e-07 1.08e-07 4.85e-07 5.49e-07 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 5.52e+00 3.01e+00 1.03e+00 4.55e-01 9.80e+00 1.00e+01 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
Fluence Cutoff-PL 1.36e-07 2.03e-07 9.48e-08 8.82e-09 4.42e-07 4.43e-07 erg/cm2
Error 1.06e-08 8.81e-09 8.66e-09 3.79e-09 1.84e-08 1.87e-08 erg/cm2
Peak flux Cutoff-PL 4.22e+00 3.76e+00 9.02e-01 3.68e-02 8.92e+00 8.92e+00 ph/cm2/s
Error 3.64e-01 1.70e-01 8.95e-02 1.76e-02 4.30e-01 4.30e-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 2.612 0.000 - - 1.05e-01 0.00e+00 185.750 57
CPL 0.255 0.437 30.3 2.3 2.38e+00 1.51e+00 49.980 56
The chi2 of BB fit is 88.37 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 2.551 0.000 - - 4.83e-02 0.00e+00 206.380 57
CPL -0.037 0.491 31.2 2.0 1.58e+00 1.17e+00 75.800 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: 0.128000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.448 -0.056 0.392
T90 0.192 -0.056 0.136
T50 0.064 -0.056 0.008
Peak 1.000 -0.332 0.668
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
293.7388 +21.9040 0.0035 0.0 -120.7 1.0912 55.7 TRIG_00933285
------------------------------------------
Foreground time interval of the image:
-0.056 0.392 (delta_t = 0.448 [sec])
Background time interval of the image:
-239.800 -151.910 (delta_t = 87.890 [sec])
-150.800 -0.056 (delta_t = 150.744 [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 -0.056 sec. to 0.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.61232 ( )
Norm@50keV : 0.104815 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 185.75 using 59 PHA bins.
# Reduced chi-squared = 3.2588 for 57 degrees of freedom
# Null hypothesis probability = 1.491014e-15
Photon flux (15-150 keV) in 0.448 sec: 22.0935 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.85202e-07 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.056 sec. to 0.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.255235 ( -0.455834 0.41877 )
Epeak [keV] : 30.3046 ( -2.50864 2.03186 )
Norm@50keV : 2.38172 ( -1.01514 2.00321 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.98 using 59 PHA bins.
# Reduced chi-squared = 0.8924 for 56 degrees of freedom
# Null hypothesis probability = 7.010284e-01
Photon flux (15-150 keV) in 0.448 sec: 20.1721 ( -0.9266 0.9313 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.42154e-07 ( -1.83281e-08 1.84701e-08 ) ergs/cm2
Band function
Time interval is from -0.056 sec. to 0.392 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.45763E-02 ( -0.548376 0.796591 )
beta : -4.28961 ( 4.28921 0.65131 )
Epeak [keV] : 30.5616 ( -2.22301 1.84353 )
Norm@50keV : 3.35300 ( -1.78353 7.64165 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.33 using 59 PHA bins.
# Reduced chi-squared = 0.8787 for 55 degrees of freedom
# Null hypothesis probability = 7.255431e-01
Photon flux (15-150 keV) in 0.448 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] : 8.73476 (-0.284614 0.291821)
R^2/D10^2 : 16.5227 (-2.23083 2.58597)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.37 using 59 PHA bins.
# Reduced chi-squared = 1.550 for 57 degrees of freedom
# Null hypothesis probability = 4.865691e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.082e-07 6.406e-09
25- 50 2.193e-07 8.310e-09
50-150 7.627e-08 7.482e-09
15-150 4.037e-07 1.602e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 33.7636 (-2.11785 2.29621)
Norm : 161.081 (-11.4124 12.2398)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.90 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 57 degrees of freedom
# Null hypothesis probability = 1.020460e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.553e-07 8.086e-09
25- 50 1.888e-07 6.966e-09
50-150 1.201e-07 1.113e-08
15-150 4.642e-07 1.736e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.32712 (-1.18896 1.01881)
R1^2/D10^2 : 41.0739 (-13.6201 32.4768)
kT2 [keV] : 12.9181 (-2.05423 3.96889)
R2^2/D10^2 : 1.60633 (-1.27898 1.88967)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.52 using 59 PHA bins.
# Reduced chi-squared = 0.8822 for 55 degrees of freedom
# Null hypothesis probability = 7.188526e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.307e-07 1.799e-08
25- 50 2.047e-07 3.273e-08
50-150 1.049e-07 4.011e-08
15-150 4.403e-07 7.797e-08
Peak spectrum fit
Power-law model
Time interval is from -0.332 sec. to 0.668 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.55122 ( )
Norm@50keV : 4.83126E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 206.38 using 59 PHA bins.
# Reduced chi-squared = 3.6207 for 57 degrees of freedom
# Null hypothesis probability = 8.593135e-19
Photon flux (15-150 keV) in 1 sec: 9.79676 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.90066e-07 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.332 sec. to 0.668 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.72574E-02 ( -0.512703 0.469445 )
Epeak [keV] : 31.2496 ( -2.20356 1.85145 )
Norm@50keV : 1.58092 ( -0.741315 1.59589 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.80 using 59 PHA bins.
# Reduced chi-squared = 1.354 for 56 degrees of freedom
# Null hypothesis probability = 4.018077e-02
Photon flux (15-150 keV) in 1 sec: 8.91703 ( -0.42847 0.4307 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.36652e-07 ( -1.9545e-08 1.9793e-08 ) ergs/cm2
Band function
Time interval is from -0.332 sec. to 0.668 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.56372E-02 ( -0.467162 0.538674 )
beta : -8.13724 ( 7.69897 17.6674 )
Epeak [keV] : 31.2405 ( -1.9432 1.85295 )
Norm@50keV : 1.57758 ( -0.736532 1.77908 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.80 using 59 PHA bins.
# Reduced chi-squared = 1.378 for 55 degrees of freedom
# Null hypothesis probability = 3.296588e-02
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] : 8.67039 (-0.302465 0.311142)
R^2/D10^2 : 7.66941 (-1.09071 1.27435)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 99.27 using 59 PHA bins.
# Reduced chi-squared = 1.742 for 57 degrees of freedom
# Null hypothesis probability = 4.465612e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.100e-07 7.350e-09
25- 50 2.203e-07 9.000e-09
50-150 7.487e-08 7.380e-09
15-150 4.051e-07 1.520e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.2148 (-2.3906 2.62611)
Norm : 71.1491 (-5.34163 5.763)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 103.59 using 59 PHA bins.
# Reduced chi-squared = 1.8174 for 57 degrees of freedom
# Null hypothesis probability = 1.590175e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.540e-07 8.550e-09
25- 50 1.884e-07 7.400e-09
50-150 1.218e-07 1.305e-08
15-150 4.642e-07 1.975e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.90156 (-1.3826 1.24797)
R1^2/D10^2 : 19.8472 (-7.52029 23.0621)
kT2 [keV] : 11.4712 (-1.5282 2.98221)
R2^2/D10^2 : 1.45538 (-1.12607 2.05208)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.79 using 59 PHA bins.
# Reduced chi-squared = 1.360 for 55 degrees of freedom
# Null hypothesis probability = 3.918115e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.300e-07 3.480e-08
25- 50 2.064e-07 4.625e-08
50-150 9.950e-08 4.150e-08
15-150 4.358e-07 1.011e-07
Plot creation:
Wed Nov 6 11:09:03 EST 2019