batgrbproduct analysis for trigger=944916
batgrbproduct Analysis for Trigger=944916
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): Thu Dec 19 17:11:22 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger944916/GCN5_download_cron
======================================================================
Trigger: 00944916 Segment: 000
BAT Trigger Time: 598329787.968 [s; MET]
Trigger Stop: 598329788.992 [s; MET]
UTC: 2019-12-18T02:42:43.860860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 301.077639808073 Dec: -40.2740100040986 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.88
Image Trigger?: NO
Rate S/N Ratio: 51.8652099195598 [ if not an image trigger ]
Image S/N Ratio: 8.88
Flight Position: [ source = BAT ]
RA: 301.077639808073 Dec: -40.2740100040986 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 301.069566689344 Dec: -40.277442167151 [deg; J2000]
{ 20h 04m 16.7s , -40d 16' 38.8" }
+/- 1.35412111688281 [arcmin] (estimated 90% radius based on SNR)
+/- 0.575711175070394 [arcmin] (formal 1-sigma fit error)
SNR: 19.7258725028514
Angular difference between Flight and Ground position is 0.423062 arcmin
Partial Coding Fraction: 0.09472656 [ including projection effects ]
Duration
T90: 44.6719999313354 +/- 0.733484755474008
Measured from: 0.544000029563904
to: 45.2159999608994 [s; relative to TRIGTIME]
T50: 37.5999999046326 +/- 2.86253107738966
Measured from: 3.11600005626678
to: 40.7159999608994 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.663999915122986
to: 1.66399991512299 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.232000112533569
to: 46.0319999456406 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.953877 2.963731 3.865106 1.528328
0.166122 0.182880 0.173567 0.146736 [error]
Peak 0.092228 0.267026 0.338142 0.141022
0.028485 0.033898 0.036557 0.032192 [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 6.77e-07 1.57e-06 2.89e-06 1.27e-05 7.84e-06 1.78e-05 erg/cm2
Error 8.11e-08 1.12e-07 1.66e-07 1.71e-06 4.33e-07 1.76e-06 erg/cm2
Peak flux Power-law 1.46e+00 1.92e+00 1.86e+00 3.19e+00 6.30e+00 8.43e+00 ph/cm2/s
Error 4.04e-01 3.33e-01 2.74e-01 9.73e-01 9.10e-01 1.23e+00 ph/cm2/s
Fluence Cutoff-PL 6.59e-07 1.58e-06 2.92e-06 1.14e-05 7.83e-06 1.66e-05 erg/cm2
Error 1.04e-07 1.14e-07 2.04e-07 3.74e-06 4.39e-07 3.10e-06 erg/cm2
Peak flux Cutoff-PL 1.11e+00 1.98e+00 2.09e+00 1.65e+00 6.10e+00 6.83e+00 ph/cm2/s
Error 5.02e-01 3.73e-01 3.70e-01 1.21e+00 9.29e-01 1.54e+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 1.122 0.098 - - 1.63e-02 9.15e-04 70.100 57
CPL 1.030 0.262 662.2 0.0 1.78e-02 5.64e-03 69.920 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.052 0.228 - - 5.45e-02 7.66e-03 68.900 57
CPL 0.136 1.036 124.6 969.2 1.32e-01 1.54e-01 65.990 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: 569.600000 sec.
T50 in the 50-300 keV band: 46.144000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 46.264 -0.232 46.032
T90 44.672 0.544 45.216
T50 37.600 3.116 40.716
Peak 1.000 0.664 1.664
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
301.0696 -40.2774 0.0098 50.3 -139.2 10.7635 19.7 TRIG_00944916
------------------------------------------
Foreground time interval of the image:
-0.232 46.032 (delta_t = 46.264 [sec])
Background time interval of the image:
-239.968 -72.588 (delta_t = 167.380 [sec])
-71.968 -0.232 (delta_t = 71.736 [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 -0.232 sec. to 46.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12172 ( -0.098389 0.0968647 )
Norm@50keV : 1.63236E-02 ( -0.000917547 0.000912899 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.10 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 57 degrees of freedom
# Null hypothesis probability = 1.140889e-01
Photon flux (15-150 keV) in 46.26 sec: 1.89764 ( -0.113546 0.113958 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.84121e-06 ( -4.33181e-07 4.3362e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.232 sec. to 46.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03040 ( -0.389573 0.134635 )
Epeak [keV] : 662.179 ( -662.177 -662.177 )
Norm@50keV : 1.77943E-02 ( -0.00371598 0.00755835 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.92 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 56 degrees of freedom
# Null hypothesis probability = 9.999503e-02
Photon flux (15-150 keV) in 46.26 sec: 1.88806 ( -0.1192 0.11919 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.8296e-06 ( -4.3947e-07 4.3762e-07 ) ergs/cm2
Band function
Time interval is from -0.232 sec. to 46.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.876088 ( 0.876088 0.876088 )
beta : -1.12172 ( -0.0968091 0.0984258 )
Epeak [keV] : 55.1782 ( )
Norm@50keV : 2.95941E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.10 using 59 PHA bins.
# Reduced chi-squared = 1.275 for 55 degrees of freedom
# Null hypothesis probability = 8.258598e-02
Photon flux (15-150 keV) in 46.26 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] : 23.7145 ( )
R^2/D10^2 : 5.13520E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 133.66 using 59 PHA bins.
# Reduced chi-squared = 2.3449 for 57 degrees of freedom
# Null hypothesis probability = 4.242437e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.385e-07 2.517e-08
25- 50 1.316e-06 1.226e-07
50-150 5.519e-06 4.302e-07
15-150 7.074e-06 4.510e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 8.23464 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 134.23 using 59 PHA bins.
# Reduced chi-squared = 2.3548 for 57 degrees of freedom
# Null hypothesis probability = 3.579786e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.486e-07 5.782e-08
25- 50 1.825e-06 1.161e-07
50-150 4.002e-06 2.551e-07
15-150 6.775e-06 4.418e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.84975 (-1.25158 1.48189)
R1^2/D10^2 : 1.65728 (-0.838475 1.94056)
kT2 [keV] : 32.3663 (-3.74387 5.25729)
R2^2/D10^2 : 1.71009E-02 (-0.00648713 0.00848898)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.07 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 55 degrees of freedom
# Null hypothesis probability = 1.882251e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.883e-07 2.063e-07
25- 50 1.527e-06 3.023e-07
50-150 5.734e-06 7.908e-07
15-150 7.949e-06 1.140e-06
Peak spectrum fit
Power-law model
Time interval is from 0.664 sec. to 1.664 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05196 ( -0.230249 0.225631 )
Norm@50keV : 5.45122E-02 ( -0.00767738 0.00764558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.90 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 57 degrees of freedom
# Null hypothesis probability = 1.342278e-01
Photon flux (15-150 keV) in 1 sec: 6.29693 ( -0.908199 0.912024 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.78919e-07 ( -8.48541e-08 8.53105e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.664 sec. to 1.664 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.136405 ( -1.15655 0.916185 )
Epeak [keV] : 124.559 ( -38.8912 1899.59 )
Norm@50keV : 0.131670 ( -0.0758725 0.232797 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.99 using 59 PHA bins.
# Reduced chi-squared = 1.178 for 56 degrees of freedom
# Null hypothesis probability = 1.698012e-01
Photon flux (15-150 keV) in 1 sec: 6.10053 ( -0.92574 0.93256 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.70576e-07 ( -8.8002e-08 8.7663e-08 ) ergs/cm2
Band function
Time interval is from 0.664 sec. to 1.664 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.132426 ( -0.415453 1.78005 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 123.689 ( -31.8719 89.9231 )
Norm@50keV : 0.132833 ( -0.0768673 0.232369 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.99 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 55 degrees of freedom
# Null hypothesis probability = 1.473951e-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] : 23.0736 (-3.52765 4.35506)
R^2/D10^2 : 0.200384 (-0.0845854 0.139226)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.02 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 57 degrees of freedom
# Null hypothesis probability = 1.153323e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.930e-08 5.395e-09
25- 50 1.049e-07 2.458e-08
50-150 4.172e-07 9.590e-08
15-150 5.414e-07 1.044e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-33.5212 -200)
Norm : 26.0654 (-3.76954 3.76954)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.25 using 59 PHA bins.
# Reduced chi-squared = 1.425 for 57 degrees of freedom
# Null hypothesis probability = 1.913676e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.492e-08 3.683e-08
25- 50 1.249e-07 7.030e-08
50-150 2.739e-07 1.534e-07
15-150 4.637e-07 2.595e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.21587 (-2.96448 2.94365)
R1^2/D10^2 : 3.20811 (-2.69103 23.0319)
kT2 [keV] : 28.3939 (-5.87002 11.4186)
R2^2/D10^2 : 9.24311E-02 (-0.0633771 0.084302)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.09 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 55 degrees of freedom
# Null hypothesis probability = 1.877985e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.972e-08 2.304e-08
25- 50 1.128e-07 6.185e-08
50-150 4.291e-07 2.409e-07
15-150 5.816e-07 3.132e-07
Plot creation:
Thu Dec 19 17:25:43 EST 2019