batgrbproduct analysis for trigger=989458
batgrbproduct Analysis for Trigger=989458
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 v2.48
Process Start Time (local time): Mon Aug 17 18:42:37 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger989458/GCN5_download_cron
======================================================================
Trigger: 00989458 Segment: 000
BAT Trigger Time: 619243667.776 [s; MET]
Trigger Stop: 619243669.824 [s; MET]
UTC: 2020-08-16T04:07:22.309240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 202.461308436717 Dec: -22.5897102537619 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.58
Image Trigger?: NO
Rate S/N Ratio: 7.87400787401181 [ if not an image trigger ]
Image S/N Ratio: 6.58
Flight Position: [ source = BAT ]
RA: 202.461308436717 Dec: -22.5897102537619 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 202.482153658044 Dec: -22.5991311591342 [deg; J2000]
{ 13h 29m 55.7s , -22d 35' 56.9" }
+/- 3.59745369026301 [arcmin] (estimated 90% radius based on SNR)
+/- 2.00752168189185 [arcmin] (formal 1-sigma fit error)
SNR: 4.88471810346752
Angular difference between Flight and Ground position is 1.285646 arcmin
Partial Coding Fraction: 0.8359375 [ including projection effects ]
Duration
T90: 2.04799997806549 +/-
Measured from: 0
to: 2.04799997806549 [s; relative to TRIGTIME]
T50: 2.04799997806549 +/-
Measured from: 0
to: 2.04799997806549 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 2.04799997806549 second)
Measured from: -5.96046447753906e-08
to: 2.04799991846085 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 2.04799997806549 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.034321 0.042736 0.001103 -0.001277
0.009690 0.009602 0.008381 0.007691 [error]
Peak 0.034321 0.042736 0.001103 -0.001277
0.009690 0.009602 0.008381 0.007691 [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 9.37e-09 1.19e-08 1.11e-08 1.81e-08 3.85e-08 5.10e-08 erg/cm2
Error 4.04e-09 4.39e-09 6.52e-09 2.33e-08 1.63e-08 2.99e-08 erg/cm2
Peak flux Power-law 1.49e-01 1.05e-01 4.89e-02 3.19e-02 3.19e-01 3.36e-01 ph/cm2/s
Error 6.54e-02 3.82e-02 2.80e-02 3.85e-02 1.14e-01 1.21e-01 ph/cm2/s
Fluence Cutoff-PL 8.07e-09 1.93e-08 3.73e-09 9.44e-12 3.12e-08 3.10e-08 erg/cm2
Error 4.65e-09 6.77e-09 5.52e-09 5.27e-10 1.07e-08 1.08e-08 erg/cm2
Peak flux Cutoff-PL 1.21e-01 1.73e-01 1.95e-02 2.96e-05 3.14e-01 3.14e-01 ph/cm2/s
Error 7.34e-02 5.82e-02 2.65e-02 1.37e-03 1.03e-01 1.03e-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 2.090 0.593 - - 2.04e-03 9.54e-04 76.490 57
CPL -4.100 0.032 33.1 7.3 2.14e+01 2.60e+05 68.900 56
The chi2 of BB fit is 69.73 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 2.090 0.593 - - 2.04e-03 9.54e-04 76.490 57
CPL -4.100 0.032 33.1 7.3 2.14e+01 2.60e+05 68.900 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 2.048 0.000 2.048
T90 2.048 0.000 2.048
T50 2.048 0.000 2.048
Peak 2.048 -0.000 2.048
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
202.4822 -22.5991 0.0393 30.3 -163.3 0.0889 4.9 TRIG_00989458
------------------------------------------
Foreground time interval of the image:
0.000 2.048 (delta_t = 2.048 [sec])
Background time interval of the image:
-239.776 -11.776 (delta_t = 228.000 [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 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08962 ( -0.558431 0.627381 )
Norm@50keV : 2.03868E-03 ( -0.000988451 0.000919771 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.49 using 59 PHA bins.
# Reduced chi-squared = 1.342 for 57 degrees of freedom
# Null hypothesis probability = 4.344987e-02
Photon flux (15-150 keV) in 2.048 sec: 0.319016 ( -0.113731 0.113727 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84924e-08 ( -1.55795e-08 1.70288e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.10031 ( 4.57768 4.64169 )
Epeak [keV] : 33.1317 ( -6.269 8.23265 )
Norm@50keV : 21.4059 ( -21.0537 519134 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.90 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 56 degrees of freedom
# Null hypothesis probability = 1.154310e-01
Photon flux (15-150 keV) in 2.048 sec: 0.313569 ( -0.101642 0.104853 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.12476e-08 ( -1.02902e-08 1.11553e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.48828 ( -4.54404 -4.48828 )
beta : -9.33928 ( 9.33928 19.2996 )
Epeak [keV] : 33.1739 ( -6.40772 7.33899 )
Norm@50keV : 37.3047 ( -11.4222 616.148 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.93 using 59 PHA bins.
# Reduced chi-squared = 1.253 for 55 degrees of freedom
# Null hypothesis probability = 9.812101e-02
Photon flux (15-150 keV) in 2.048 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] : 8.51595 (-1.9333 2.50035)
R^2/D10^2 : 0.326207 (-0.32618 0.573387)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.73 using 59 PHA bins.
# Reduced chi-squared = 1.223 for 57 degrees of freedom
# Null hypothesis probability = 1.200489e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.141e-09 5.655e-09
25- 50 1.778e-08 1.160e-08
50-150 5.712e-09 4.433e-09
15-150 3.263e-08 2.051e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 42.3878 (-21.1419 73.3193)
Norm : 2.09425 (-0.93456 1.57478)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.11 using 59 PHA bins.
# Reduced chi-squared = 1.300 for 57 degrees of freedom
# Null hypothesis probability = 6.343943e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.003e-08 6.193e-09
25- 50 1.353e-08 8.330e-09
50-150 1.114e-08 9.297e-09
15-150 3.470e-08 2.359e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.54020 (-8.52783 -8.52783)
R1^2/D10^2 : 0.109447 (-0.109151 -0.109151)
kT2 [keV] : 8.49469 (-8.51293 -8.51293)
R2^2/D10^2 : 0.217675 (-0.217231 -0.217231)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.73 using 59 PHA bins.
# Reduced chi-squared = 1.268 for 55 degrees of freedom
# Null hypothesis probability = 8.727355e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.150e-09 1.070e-01
25- 50 1.778e-08 9.456e-01
50-150 5.698e-09 2.243e+01
15-150 3.263e-08 2.473e+01
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08962 ( -0.558431 0.627381 )
Norm@50keV : 2.03868E-03 ( -0.000988451 0.000919771 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.49 using 59 PHA bins.
# Reduced chi-squared = 1.342 for 57 degrees of freedom
# Null hypothesis probability = 4.344987e-02
Photon flux (15-150 keV) in 2.048 sec: 0.319016 ( -0.113731 0.113727 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84924e-08 ( -1.55795e-08 1.70288e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.10031 ( 4.57768 4.64169 )
Epeak [keV] : 33.1317 ( -6.269 8.23265 )
Norm@50keV : 21.4059 ( -21.0537 519134 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.90 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 56 degrees of freedom
# Null hypothesis probability = 1.154310e-01
Photon flux (15-150 keV) in 2.048 sec: 0.313569 ( -0.101642 0.104853 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.12476e-08 ( -1.02902e-08 1.11553e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.48828 ( -4.54404 -4.48828 )
beta : -9.33928 ( 9.33928 19.2996 )
Epeak [keV] : 33.1739 ( -6.40772 7.33899 )
Norm@50keV : 37.3047 ( -11.4222 616.148 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.93 using 59 PHA bins.
# Reduced chi-squared = 1.253 for 55 degrees of freedom
# Null hypothesis probability = 9.812101e-02
Photon flux (15-150 keV) in 2.048 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] : 8.51595 (-1.9333 2.50035)
R^2/D10^2 : 0.326207 (-0.32618 0.573387)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.73 using 59 PHA bins.
# Reduced chi-squared = 1.223 for 57 degrees of freedom
# Null hypothesis probability = 1.200489e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.141e-09 5.557e-09
25- 50 1.778e-08 1.141e-08
50-150 5.712e-09 4.392e-09
15-150 3.263e-08 2.070e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 42.3878 (-21.1419 73.3193)
Norm : 2.09425 (-0.93456 1.57478)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.11 using 59 PHA bins.
# Reduced chi-squared = 1.300 for 57 degrees of freedom
# Null hypothesis probability = 6.343943e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.003e-08 6.332e-09
25- 50 1.353e-08 8.348e-09
50-150 1.114e-08 9.773e-09
15-150 3.470e-08 2.245e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.54020 (-8.52783 -8.52783)
R1^2/D10^2 : 0.109447 (-0.109151 -0.109151)
kT2 [keV] : 8.49469 (-8.51293 -8.51293)
R2^2/D10^2 : 0.217675 (-0.217231 -0.217231)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.73 using 59 PHA bins.
# Reduced chi-squared = 1.268 for 55 degrees of freedom
# Null hypothesis probability = 8.727355e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.150e-09 1.169e-01
25- 50 1.778e-08 9.734e-01
50-150 5.698e-09 2.273e+01
15-150 3.263e-08 2.612e+01
Plot creation:
Mon Aug 17 18:45:46 EDT 2020