batgrbproduct analysis for trigger=954840
batgrbproduct Analysis for Trigger=954840
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 Feb 8 01:37:24 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger954840/GCN5_download_cron
======================================================================
Trigger: 00954840 Segment: 000
BAT Trigger Time: 602737362.496 [s; MET]
Trigger Stop: 602737363.52 [s; MET]
UTC: 2020-02-07T03:02:18.103520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 163.62331031106 Dec: -49.5813151574992 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.53
Image Trigger?: NO
Rate S/N Ratio: 18.5741756210067 [ if not an image trigger ]
Image S/N Ratio: 6.53
Flight Position: [ source = BAT ]
RA: 163.62331031106 Dec: -49.5813151574992 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 163.541107556817 Dec: -49.6017053267019 [deg; J2000]
{ 10h 54m 09.9s , -49d 36' 06.1" }
+/- 3.67780766437152 [arcmin] (estimated 90% radius based on SNR)
+/- 2.40733242602317 [arcmin] (formal 1-sigma fit error)
SNR: 4.732973523044
Angular difference between Flight and Ground position is 3.423268 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 1.0239999294281 +/-
Measured from: 0
to: 1.0239999294281 [s; relative to TRIGTIME]
T50: 1.0239999294281 +/-
Measured from: 0
to: 1.0239999294281 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.0239999294281 second)
Measured from: 0
to: 1.0239999294281 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.0239999294281 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.005801 0.009375 0.026558 0.029807
0.007342 0.008026 0.007607 0.008754 [error]
Peak -0.005801 0.009375 0.026558 0.029807
0.007342 0.008026 0.007607 0.008754 [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 4.29e-10 2.72e-09 1.51e-08 3.92e-07 5.02e-08 4.10e-07 erg/cm2
Error 9.23e-10 3.27e-09 1.13e-08 5.68e-07 3.53e-08 5.74e-07 erg/cm2
Peak flux Power-law 1.29e-02 4.35e-02 1.21e-01 1.01e+00 3.32e-01 1.19e+00 ph/cm2/s
Error 2.84e-02 5.40e-02 9.17e-02 1.32e+00 2.31e-01 1.10e+00 ph/cm2/s
Fluence Cutoff-PL 3.75e-10 2.64e-09 1.55e-08 3.24e-07 5.06e-08 3.42e-07 erg/cm2
Error 9.21e-10 2.30e-09 1.34e-08 1.55e-06 2.07e-08 5.17e-07 erg/cm2
Peak flux Cutoff-PL 1.13e-02 4.19e-02 1.23e-01 8.70e-01 3.32e-01 1.06e+00 ph/cm2/s
Error 2.83e-02 5.39e-02 8.23e-02 1.57e+00 2.07e-01 1.94e+00 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 -0.475 1.476 - - 2.00e-03 1.78e-03 43.270 57
CPL -0.714 0.000 975.3 0.0 2.30e-03 0.00e+00 43.270 56
The chi2 of BB fit is 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 -0.475 1.476 - - 2.00e-03 1.78e-03 43.270 57
CPL -0.714 5.244 975.3 0.0 2.30e-03 5.64e-01 43.270 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
163.5411 -49.6017 0.0407 28.2 -155.5 0.0812 4.7 TRIG_00954840
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.496 -55.020 (delta_t = 5.476 [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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.475061 ( -1.93756 1.01476 )
Norm@50keV : 2.00417E-03 ( -0.0016775 0.00187482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.27 using 59 PHA bins.
# Reduced chi-squared = 0.7592 for 57 degrees of freedom
# Null hypothesis probability = 9.103011e-01
Photon flux (15-150 keV) in 1.024 sec: 0.331963 ( -0.29809 0.163277 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.01992e-08 ( -5.01992e-08 2.03052e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.713560 ( )
Epeak [keV] : 975.285 ( )
Norm@50keV : 2.29825E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.27 using 59 PHA bins.
# Reduced chi-squared = 0.7726 for 56 degrees of freedom
# Null hypothesis probability = 8.933572e-01
Photon flux (15-150 keV) in 1.024 sec: 0.332129 ( -0.25111 0.16247 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.0559e-08 ( -2.04578e-08 2.08732e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.306605 ( -0.306605 -0.306605 )
beta : 0.475045 ( -1.01473 1.93813 )
Epeak [keV] : 22.0057 ( -22.0057 -22.0057 )
Norm@50keV : 3.35385E-03 ( -0.00335384 3106.18 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.27 using 59 PHA bins.
# Reduced chi-squared = 0.7868 for 55 degrees of freedom
# Null hypothesis probability = 8.737968e-01
Photon flux (15-150 keV) in 1.024 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] : 96.1075 (-99.155 -99.155)
R^2/D10^2 : 5.05439E-04 (-0.000487639 0.00489382)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.30 using 59 PHA bins.
# Reduced chi-squared = 0.7596 for 57 degrees of freedom
# Null hypothesis probability = 9.098633e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.015e-10 2.192e-10
25- 50 2.422e-09 1.881e-09
50-150 4.663e-08 4.135e-08
15-150 4.935e-08 4.472e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.343 (-125.358 -199.356)
Norm : 1.08096 (-0.751529 0.756047)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.24 using 59 PHA bins.
# Reduced chi-squared = 0.9516 for 57 degrees of freedom
# Null hypothesis probability = 5.792537e-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
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 4.04903E-05 (-4.09198e-05 -4.09198e-05)
kT2 [keV] : 84.5953 (-84.4589 -84.4589)
R2^2/D10^2 : 4.99298E-04 (-0.000498071 0.200886)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.29 using 59 PHA bins.
#Fit statistic : Chi-Squared = 43.28 using 59 PHA bins.
# Reduced chi-squared = 0.7871 for 55 degrees of freedom
# Reduced chi-squared = 0.7869 for 55 degrees of freedom
# Null hypothesis probability = 8.733627e-01
# Null hypothesis probability = 8.736823e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.281e-10 4.782e-09
25- 50 2.605e-09 4.116e-08
50-150 4.777e-08 9.810e-07
15-150 5.071e-08 1.265e-06
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.475061 ( -1.93756 1.01476 )
Norm@50keV : 2.00417E-03 ( -0.0016775 0.00187482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.27 using 59 PHA bins.
# Reduced chi-squared = 0.7592 for 57 degrees of freedom
# Null hypothesis probability = 9.103011e-01
Photon flux (15-150 keV) in 1.024 sec: 0.331963 ( -0.29809 0.163277 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.01992e-08 ( -5.01992e-08 2.03052e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.713560 ( -9.24623 1.24093 )
Epeak [keV] : 975.285 ( -980.467 -980.467 )
Norm@50keV : 2.29825E-03 ( -0.00229627 1.1249 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.27 using 59 PHA bins.
# Reduced chi-squared = 0.7726 for 56 degrees of freedom
# Null hypothesis probability = 8.933572e-01
Photon flux (15-150 keV) in 1.024 sec: 0.332129 ( -0.25111 0.16247 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.0559e-08 ( -2.04578e-08 2.08732e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.306605 ( -0.306605 -0.306605 )
beta : 0.475045 ( -1.01473 1.93813 )
Epeak [keV] : 22.0057 ( -22.0057 -22.0057 )
Norm@50keV : 3.35385E-03 ( -0.00335384 3106.18 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.27 using 59 PHA bins.
# Reduced chi-squared = 0.7868 for 55 degrees of freedom
# Null hypothesis probability = 8.737968e-01
Photon flux (15-150 keV) in 1.024 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] : 96.1075 (-99.155 -99.155)
R^2/D10^2 : 5.05439E-04 (-0.000487639 0.00489382)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.30 using 59 PHA bins.
# Reduced chi-squared = 0.7596 for 57 degrees of freedom
# Null hypothesis probability = 9.098633e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.015e-10 2.254e-10
25- 50 2.422e-09 1.732e-09
50-150 4.663e-08 3.706e-08
15-150 4.935e-08 4.350e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.343 (-125.358 -199.356)
Norm : 1.08096 (-0.751529 0.756047)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.24 using 59 PHA bins.
# Reduced chi-squared = 0.9516 for 57 degrees of freedom
# Null hypothesis probability = 5.792537e-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
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 4.04903E-05 (-4.09198e-05 -4.09198e-05)
kT2 [keV] : 84.5953 (-84.4589 -84.4589)
R2^2/D10^2 : 4.99298E-04 (-0.000498071 0.200886)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.29 using 59 PHA bins.
#Fit statistic : Chi-Squared = 43.28 using 59 PHA bins.
# Reduced chi-squared = 0.7871 for 55 degrees of freedom
# Reduced chi-squared = 0.7869 for 55 degrees of freedom
# Null hypothesis probability = 8.733627e-01
# Null hypothesis probability = 8.736823e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.281e-10 4.920e-09
25- 50 2.605e-09 3.974e-08
50-150 4.777e-08 1.052e-06
15-150 5.071e-08 1.051e-06
Plot creation:
Sat Feb 8 01:40:16 EST 2020