batgrbproduct analysis for trigger=956639
batgrbproduct Analysis for Trigger=956639
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): Sun Feb 16 19:27:16 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger956639/GCN5_download_cron
======================================================================
Trigger: 00956639 Segment: 000
BAT Trigger Time: 603470396.416 [s; MET]
Trigger Stop: 603470397.44 [s; MET]
UTC: 2020-02-15T14:39:31.975900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 34.1217781187011 Dec: 12.7806238069698 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.49
Image Trigger?: NO
Rate S/N Ratio: 37.1214223865412 [ if not an image trigger ]
Image S/N Ratio: 16.49
Flight Position: [ source = BAT ]
RA: 34.1217781187011 Dec: 12.7806238069698 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 34.1003946152986 Dec: 12.7754633163133 [deg; J2000]
{ 02h 16m 24.1s , +12d 46' 31.7" }
+/- 0.981454327619414 [arcmin] (estimated 90% radius based on SNR)
+/- 0.352535634970187 [arcmin] (formal 1-sigma fit error)
SNR: 31.2415470049829
Angular difference between Flight and Ground position is 1.288977 arcmin
Partial Coding Fraction: 0.734375 [ including projection effects ]
Duration
T90: 11.6719999313354 +/- 2.18904625118654
Measured from: -7.29999983310699
to: 4.37200009822845 [s; relative to TRIGTIME]
T50: 3.70799994468689 +/- 0.620735053200126
Measured from: -2.08799993991852
to: 1.62000000476837 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.159999966621399
to: 0.840000033378601 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.97200000286102
to: 5.36800003051758 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.406676 0.657874 0.510885 0.128607
0.029434 0.031151 0.027979 0.023393 [error]
Peak 0.071377 0.120232 0.112199 0.043022
0.008417 0.009415 0.009069 0.007145 [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 1.36e-07 2.65e-07 4.00e-07 1.31e-06 1.12e-06 2.11e-06 erg/cm2
Error 1.34e-08 1.58e-08 2.69e-08 1.93e-07 6.65e-08 2.11e-07 erg/cm2
Peak flux Power-law 7.25e-01 8.68e-01 7.51e-01 1.11e+00 2.74e+00 3.45e+00 ph/cm2/s
Error 1.13e-01 8.27e-02 7.09e-02 2.21e-01 2.29e-01 2.98e-01 ph/cm2/s
Fluence Cutoff-PL 1.27e-07 2.74e-07 4.11e-07 8.00e-07 1.10e-06 1.61e-06 erg/cm2
Error 1.60e-08 1.84e-08 3.00e-08 2.94e-07 7.17e-08 3.89e-07 erg/cm2
Peak flux Cutoff-PL 7.02e-01 8.79e-01 7.64e-01 9.40e-01 2.72e+00 3.29e+00 ph/cm2/s
Error 1.32e-01 9.12e-02 8.36e-02 3.93e-01 2.33e-01 4.54e-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 1.406 0.094 - - 7.58e-03 4.11e-04 62.450 57
CPL 1.055 0.369 141.1 1465.9 1.12e-02 4.68e-03 59.570 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.209 0.141 - - 2.33e-02 1.90e-03 46.410 57
CPL 1.061 0.419 345.2 0.0 2.74e-02 1.41e-02 46.180 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: 12.672000 sec.
T50 in the 50-300 keV band: 2.432000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 15.340 -9.972 5.368
T90 11.672 -7.300 4.372
T50 3.708 -2.088 1.620
Peak 1.000 -0.160 0.840
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
34.1004 +12.7755 0.0062 34.1 -167.8 1.7725 31.2 TRIG_00956639
------------------------------------------
Foreground time interval of the image:
-9.972 5.368 (delta_t = 15.340 [sec])
Background time interval of the image:
-239.416 -55.846 (delta_t = 183.570 [sec])
-54.416 -9.972 (delta_t = 44.444 [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 -9.972 sec. to 5.368 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40601 ( -0.0944379 0.0943413 )
Norm@50keV : 7.58455E-03 ( -0.000411316 0.000411101 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.45 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.887354e-01
Photon flux (15-150 keV) in 15.34 sec: 0.924925 ( -0.0520805 0.0521673 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12285e-06 ( -6.63455e-08 6.65917e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.972 sec. to 5.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05499 ( -0.385823 0.352342 )
Epeak [keV] : 141.143 ( -48.4588 2883.35 )
Norm@50keV : 1.12336E-02 ( -0.00351503 0.00584312 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.57 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 56 degrees of freedom
# Null hypothesis probability = 3.472116e-01
Photon flux (15-150 keV) in 15.34 sec: 0.909801 ( -0.054169 0.054209 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09818e-06 ( -7.1871e-08 7.15488e-08 ) ergs/cm2
Band function
Time interval is from -9.972 sec. to 5.368 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05926 ( -0.221131 0.381658 )
beta : -9.37125 ( 9.37158 19.3716 )
Epeak [keV] : 142.690 ( -59.8971 2949.47 )
Norm@50keV : 1.11706E-02 ( -0.00223073 0.00449565 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.57 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 55 degrees of freedom
# Null hypothesis probability = 3.130567e-01
Photon flux (15-150 keV) in 15.34 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] : 16.4218 ( )
R^2/D10^2 : 7.77232E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 131.01 using 59 PHA bins.
# Reduced chi-squared = 2.2984 for 57 degrees of freedom
# Null hypothesis probability = 9.314964e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.608e-08 7.041e-09
25- 50 2.842e-07 1.941e-08
50-150 5.409e-07 5.906e-08
15-150 8.912e-07 5.653e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-18.1571 -200)
Norm : 3.83931 (-0.207669 0.207669)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.06 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 57 degrees of freedom
# Null hypothesis probability = 1.702179e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.467e-07 8.652e-09
25- 50 2.822e-07 1.787e-08
50-150 6.189e-07 1.111e-07
15-150 1.048e-06 7.570e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.12034 (-1.26045 1.3711)
R1^2/D10^2 : 0.564048 (-0.218285 0.410162)
kT2 [keV] : 30.8657 (-5.29816 8.72651)
R2^2/D10^2 : 7.02202E-03 (-0.00391567 0.00665243)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.84 using 59 PHA bins.
# Reduced chi-squared = 0.9972 for 55 degrees of freedom
# Null hypothesis probability = 4.805594e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.201e-07 2.488e-08
25- 50 2.857e-07 5.055e-08
50-150 7.064e-07 2.126e-07
15-150 1.112e-06 2.550e-07
Peak spectrum fit
Power-law model
Time interval is from -0.160 sec. to 0.840 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20919 ( -0.141292 0.140107 )
Norm@50keV : 2.32752E-02 ( -0.00189517 0.00189517 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.41 using 59 PHA bins.
# Reduced chi-squared = 0.8143 for 57 degrees of freedom
# Null hypothesis probability = 8.406271e-01
Photon flux (15-150 keV) in 1 sec: 2.73562 ( -0.229191 0.229456 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.35529e-07 ( -2.12554e-08 2.13517e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.160 sec. to 0.840 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06064 ( -0.565777 0.27288 )
Epeak [keV] : 345.171 ( -345.172 -345.172 )
Norm@50keV : 2.73771E-02 ( -0.00577472 0.0223548 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.18 using 59 PHA bins.
# Reduced chi-squared = 0.8246 for 56 degrees of freedom
# Null hypothesis probability = 8.224906e-01
Photon flux (15-150 keV) in 1 sec: 2.72151 ( -0.23228 0.23397 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33913e-07 ( -2.2341e-08 2.21e-08 ) ergs/cm2
Band function
Time interval is from -0.160 sec. to 0.840 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.51986E-02 ( 0.689545 5.68117 )
beta : -1.27078 ( 1.26602 0.184161 )
Epeak [keV] : 50.2651 ( -49.993 195.024 )
Norm@50keV : 0.152325 ( -0.16012 747.386 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.76 using 59 PHA bins.
# Reduced chi-squared = 0.8319 for 55 degrees of freedom
# Null hypothesis probability = 8.083336e-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] : 18.9546 (-2.02531 2.35542)
R^2/D10^2 : 0.150609 (-0.0484897 0.0688628)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.98 using 59 PHA bins.
# Reduced chi-squared = 1.403 for 57 degrees of freedom
# Null hypothesis probability = 2.401711e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.065e-08 1.854e-09
25- 50 5.111e-08 6.465e-09
50-150 1.349e-07 1.820e-08
15-150 1.967e-07 2.070e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-19.3036 -200)
Norm : 11.3014 (-0.939335 0.939335)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.72 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 57 degrees of freedom
# Null hypothesis probability = 2.806354e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.814e-08 3.355e-09
25- 50 5.412e-08 8.140e-09
50-150 1.187e-07 4.352e-08
15-150 2.010e-07 4.720e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.13489 (-2.02501 2.42815)
R1^2/D10^2 : 1.48654 (-0.811766 2.30123)
kT2 [keV] : 34.2261 (-8.09474 18.8362)
R2^2/D10^2 : 1.81721E-02 (-0.0131161 0.0264847)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.05 using 59 PHA bins.
# Reduced chi-squared = 0.8191 for 55 degrees of freedom
# Null hypothesis probability = 8.284237e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.107e-08 7.510e-09
25- 50 5.229e-08 1.672e-08
50-150 1.632e-07 7.553e-08
15-150 2.365e-07 8.937e-08
Plot creation:
Sun Feb 16 19:30:24 EST 2020