batgrbproduct analysis for trigger=946257
batgrbproduct Analysis for Trigger=946257
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 Dec 27 19:47:00 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger946257/GCN5_download_cron
======================================================================
Trigger: 00946257 Segment: 000
BAT Trigger Time: 599032821.376 [s; MET]
Trigger Stop: 599032829.568 [s; MET]
UTC: 2019-12-26T05:59:57.223360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.920853858823 Dec: -40.2356723745026 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.56
Image Trigger?: NO
Rate S/N Ratio: 10.7238052947636 [ if not an image trigger ]
Image S/N Ratio: 9.56
Flight Position: [ source = BAT ]
RA: 135.920853858823 Dec: -40.2356723745026 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 135.905606640139 Dec: -40.2280788874305 [deg; J2000]
{ 09h 03m 37.3s , -40d 13' 41.1" }
+/- 2.29155358330207 [arcmin] (estimated 90% radius based on SNR)
+/- 1.20440115555274 [arcmin] (formal 1-sigma fit error)
SNR: 9.30351211344704
Angular difference between Flight and Ground position is 0.833886 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 609.12399995327 +/- 16.129106280681
Measured from: -159.519999980927
to: 449.603999972343 [s; relative to TRIGTIME]
T50: 331.951999902725 +/- 8.70259723183818
Measured from: -40.4319999217987
to: 291.519999980927 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -135.628000020981
to: -134.628000020981 [s; relative to TRIGTIME]
Total Fluence
Measured from: -219.700000047684
to: 504.719999909401 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 20.107582 11.790260 0.669436 0.006118
0.195943 0.197370 0.173550 0.174793 [error]
Peak 0.070055 0.040550 0.003340 0.014945
0.007743 0.007652 0.006504 0.006328 [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 7.79e-06 4.03e-06 1.29e-06 5.31e-07 1.34e-05 1.36e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 5.85e-01 2.66e-01 7.27e-02 2.48e-02 9.38e-01 9.48e-01 ph/cm2/s
Error 1.11e-01 6.40e-02 3.47e-02 2.06e-02 1.72e-01 1.77e-01 ph/cm2/s
Fluence Cutoff-PL 5.95e-06 4.63e-06 2.06e-07 5.74e-11 1.08e-05 1.08e-05 erg/cm2
Error 4.54e-07 1.68e-07 5.75e-08 1.00e-10 5.03e-07 5.03e-07 erg/cm2
Peak flux Cutoff-PL 6.46e-01 2.96e-01 2.63e-03 1.15e-08 9.45e-01 9.45e-01 ph/cm2/s
Error 1.30e-01 9.11e-02 8.53e-03 1.11e-05 1.60e-01 1.60e-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 3.642 0.000 - - 1.08e-03 0.00e+00 287.180 57
CPL 1.000 0.000 50.0 0.0 4.20e-03 0.00e+00 1407.340 56
The chi2 of BB fit is 63.35 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 2.869 0.414 - - 3.74e-03 1.40e-03 58.850 57
CPL -5.027 -0.387 22.6 3.0 3.42e+03 1.30e+07 45.950 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 724.420 -219.700 504.720
T90 609.124 -159.520 449.604
T50 331.952 -40.432 291.520
Peak 1.000 -135.628 -134.628
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.9056 -40.2281 0.0206 0.1 149.2 19.1164 9.3 TRIG_00946257
------------------------------------------
Foreground time interval of the image:
-219.700 254.754 (delta_t = 474.454 [sec])
255.624 428.225 (delta_t = 172.601 [sec])
Background time interval of the image:
-239.376 -219.700 (delta_t = 19.676 [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
Multiple GTIs in the spectrum
tstart tstop
-219.700000 254.754000
255.624000 504.720000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.64212 ( )
Norm@50keV : 1.07701E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 287.18 using 59 PHA bins.
# Reduced chi-squared = 5.0383 for 57 degrees of freedom
# Null hypothesis probability = 1.963906e-32
Photon flux (15-150 keV) in 723.5 sec: 0.489503 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34112e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-219.700000 254.754000
255.624000 504.720000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 4.20244E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1407.34 using 59 PHA bins.
# Reduced chi-squared = 25.1310 for 56 degrees of freedom
# Null hypothesis probability = 1.818589e-257
Photon flux (15-150 keV) in 723.5 sec: 0.394631 ( -0.022205 0.022395 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07845e-05 ( -5.01964e-07 5.04497e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-219.700000 254.754000
255.624000 504.720000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.56152 ( )
beta : -8.84311 ( )
Epeak [keV] : 12.5491 ( )
Norm@50keV : 8.21359E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 509.69 using 59 PHA bins.
# Reduced chi-squared = 9.2670 for 55 degrees of freedom
# Null hypothesis probability = 6.569813e-75
Photon flux (15-150 keV) in 723.5 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] : 5.28022 (-0.132061 0.136293)
R^2/D10^2 : 2.84208 (-0.38004 0.437614)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.35 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 57 degrees of freedom
# Null hypothesis probability = 2.623855e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.189e-06 3.353e-07
25- 50 4.613e-06 1.671e-07
50-150 2.426e-07 3.343e-08
15-150 1.104e-05 4.232e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.1667 ( )
Norm : 9.87596 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 128.29 using 59 PHA bins.
# Reduced chi-squared = 2.2506 for 57 degrees of freedom
# Null hypothesis probability = 2.070259e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.319e-06 4.753e-07
25- 50 4.391e-06 1.805e-07
50-150 5.919e-07 6.439e-08
15-150 1.230e-05 5.679e-07
Double BB
R1^2/D10^2 : 2.96634 (-0.38 0.437654)
kT2 [keV] : 199.812 (-199.811 -199.812)
R2^2/D10^2 : 4.08482E-06 (-2.26614e-06 0.000132966)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.35 using 59 PHA bins.
#Fit statistic : Chi-Squared = 54.93 using 59 PHA bins.
#Fit statistic : Chi-Squared = 54.89 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 55 degrees of freedom
# Reduced chi-squared = 0.9988 for 55 degrees of freedom
# Reduced chi-squared = 0.9981 for 55 degrees of freedom
# Null hypothesis probability = 2.055297e-01
# Null hypothesis probability = 4.771539e-01
# Null hypothesis probability = 4.787036e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from -135.628 sec. to -134.628 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.86900 ( -0.383493 0.445459 )
Norm@50keV : 3.74449E-03 ( -0.00133616 0.00147025 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.85 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 57 degrees of freedom
# Null hypothesis probability = 4.076118e-01
Photon flux (15-150 keV) in 1 sec: 0.937741 ( -0.171775 0.172733 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.2486e-08 ( -9.84622e-09 1.0769e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -135.628 sec. to -134.628 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -5.02715 ( 3.78907 3.01575 )
Epeak [keV] : 22.5502 ( -3.2384 2.81045 )
Norm@50keV : 3423.39 ( -3456.21 2.59683e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.95 using 59 PHA bins.
# Reduced chi-squared = 0.8206 for 56 degrees of freedom
# Null hypothesis probability = 8.286229e-01
Photon flux (15-150 keV) in 1 sec: 0.944720 ( -0.159487 0.15995 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50731e-08 ( -6.3682e-09 6.6813e-09 ) ergs/cm2
Band function
Time interval is from -135.628 sec. to -134.628 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.80611 ( -3.26643 -4.80611 )
beta : -9.37153 ( 9.37153 19.2107 )
Epeak [keV] : 22.4830 ( -2.28859 2.48026 )
Norm@50keV : 2334.85 ( -385.808 4768.89 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.95 using 59 PHA bins.
# Reduced chi-squared = 0.8354 for 55 degrees of freedom
# Null hypothesis probability = 8.026411e-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] : 5.35587 (-0.717033 0.810055)
R^2/D10^2 : 6.26664 (-2.95127 5.72647)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.57 using 59 PHA bins.
# Reduced chi-squared = 0.8346 for 57 degrees of freedom
# Null hypothesis probability = 8.088129e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.991e-08 6.381e-09
25- 50 1.535e-08 5.687e-09
50-150 8.613e-10 6.065e-10
15-150 3.612e-08 1.011e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.5310 (-4.85541 7.31027)
Norm : 13.7477 (-4.72149 7.01454)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.52 using 59 PHA bins.
# Reduced chi-squared = 0.9389 for 57 degrees of freedom
# Null hypothesis probability = 6.064173e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.890e-08 4.830e-09
25- 50 1.486e-08 5.587e-09
50-150 3.534e-09 2.667e-09
15-150 3.730e-08 1.137e-08
Double BB
R1^2/D10^2 : 6.59242 (-2.95355 5.72421)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 3.96525E-05 (-3.9655e-05 -3.9655e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.57 using 59 PHA bins.
#Fit statistic : Chi-Squared = 46.46 using 59 PHA bins.
#Fit statistic : Chi-Squared = 46.43 using 59 PHA bins.
# Reduced chi-squared = 0.8650 for 55 degrees of freedom
# Reduced chi-squared = 0.8446 for 55 degrees of freedom
# Reduced chi-squared = 0.8441 for 55 degrees of freedom
# Null hypothesis probability = 7.512537e-01
# Null hypothesis probability = 7.871923e-01
# Null hypothesis probability = 7.880707e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Fri Dec 27 19:52:05 EST 2019