batgrbproduct analysis for trigger=853824
batgrbproduct Analysis for Trigger=853824
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 Aug 19 00:15:10 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger853824/GCN5_download_cron
======================================================================
Trigger: 00853824 Segment: 000
BAT Trigger Time: 556254745.472 [s; MET]
Trigger Stop: 556254747.52 [s; MET]
UTC: 2018-08-18T03:12:04.026320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 169.611178716171 Dec: -48.3444485884011 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.09
Image Trigger?: NO
Rate S/N Ratio: 8.30662386291807 [ if not an image trigger ]
Image S/N Ratio: 7.09
Flight Position: [ source = BAT ]
RA: 169.611178716171 Dec: -48.3444485884011 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 169.698048406153 Dec: -48.3438546238789 [deg; J2000]
{ 11h 18m 47.5s , -48d 20' 37.9" }
+/- 2.25795907145411 [arcmin] (estimated 90% radius based on SNR)
+/- 0.878303467702127 [arcmin] (formal 1-sigma fit error)
SNR: 9.50188379871919
Angular difference between Flight and Ground position is 3.464485 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 13.7120000123978 +/- 4.05053664590975
Measured from: -1.59999990463257
to: 12.1120001077652 [s; relative to TRIGTIME]
T50: 5.91999995708466 +/- 2.4047418417768
Measured from: 1.18400013446808
to: 7.10400009155273 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.6360000371933
to: 2.6360000371933 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.14400005340576
to: 14.095999956131 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.229441 0.192549 0.073973 0.051672
0.030014 0.030679 0.026774 0.024796 [error]
Peak 0.035746 0.036380 0.004325 0.007109
0.007672 0.008123 0.006910 0.006202 [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 6.53e-08 8.08e-08 7.27e-08 1.13e-07 2.58e-07 3.32e-07 erg/cm2
Error 1.42e-08 1.41e-08 2.51e-08 7.67e-08 5.61e-08 1.07e-07 erg/cm2
Peak flux Power-law 3.00e-01 2.11e-01 9.77e-02 6.33e-02 6.40e-01 6.73e-01 ph/cm2/s
Error 1.05e-01 6.23e-02 5.07e-02 7.18e-02 1.81e-01 1.97e-01 ph/cm2/s
Fluence Cutoff-PL 6.57e-08 8.06e-08 7.20e-08 9.47e-08 2.57e-07 3.09e-07 erg/cm2
Error 1.43e-08 1.66e-08 2.05e-08 1.06e-07 6.07e-08 1.28e-07 erg/cm2
Peak flux Cutoff-PL 2.78e-01 2.75e-01 6.04e-02 1.56e-03 6.15e-01 6.15e-01 ph/cm2/s
Error 1.19e-01 9.47e-02 6.53e-02 2.60e-02 1.72e-01 1.72e-01 ph/cm2/s
Fluence Band 8.80e-08 1.09e-07 7.18e-08 6.98e-08 2.99e-07 3.40e-07 erg/cm2
Error 1.78e-08 2.32e-08 -------- -------- -------- -------- 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 2.153 0.357 - - 1.70e-03 4.22e-04 47.860 57
CPL 2.341 0.786 136.6 0.0 1.33e-03 0.00e+00 47.690 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.112 0.539 - - 4.04e-03 1.62e-03 70.930 57
CPL -0.384 3.598 32.5 0.0 1.72e-01 1.25e+02 68.780 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 16.240 -2.144 14.096
T90 13.712 -1.600 12.112
T50 5.920 1.184 7.104
Peak 1.000 1.636 2.636
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
169.6980 -48.3439 0.0202 15.9 80.4 0.5703 9.5 TRIG_00853824
------------------------------------------
Foreground time interval of the image:
-2.144 14.096 (delta_t = 16.240 [sec])
Background time interval of the image:
-239.472 -2.144 (delta_t = 237.328 [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 -2.144 sec. to 14.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15324 ( -0.33387 0.379816 )
Norm@50keV : 1.69935E-03 ( -0.000430779 0.000412561 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.86 using 59 PHA bins.
# Reduced chi-squared = 0.8396 for 57 degrees of freedom
# Null hypothesis probability = 8.005845e-01
Photon flux (15-150 keV) in 16.24 sec: 0.274598 ( -0.0446119 0.0446197 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.57896e-07 ( -5.46102e-08 5.75927e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.144 sec. to 14.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.34107 ( -1.5509 0.0205168 )
Epeak [keV] : 136.564 ( )
Norm@50keV : 1.33135E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.69 using 59 PHA bins.
# Reduced chi-squared = 0.8516 for 56 degrees of freedom
# Null hypothesis probability = 7.775681e-01
Photon flux (15-150 keV) in 16.24 sec: 0.274568 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56803e-07 ( -6.38557e-08 5.76244e-08 ) ergs/cm2
Band function
Time interval is from -2.144 sec. to 14.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.71912 ( 1.72931 1.72931 )
beta : -2.14351 ( 2.15258 0.33405 )
Epeak [keV] : 10.0857 ( -7.54002 -7.54002 )
Norm@50keV : 4.32059E-03 ( -0.00472047 0.0660929 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.86 using 59 PHA bins.
# Reduced chi-squared = 0.8703 for 55 degrees of freedom
# Null hypothesis probability = 7.414609e-01
Photon flux (15-150 keV) in 16.24 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99345e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.56866 (-1.53129 1.82321)
R^2/D10^2 : 0.227206 (-0.120409 0.26466)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.82 using 59 PHA bins.
# Reduced chi-squared = 0.9794 for 57 degrees of freedom
# Null hypothesis probability = 5.192675e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.131e-08 1.643e-08
25- 50 1.008e-07 3.094e-08
50-150 3.302e-08 1.650e-08
15-150 1.852e-07 5.211e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 49.2037 (-19.0659 42.4088)
Norm : 1.55886 (-0.412158 0.635879)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.95 using 59 PHA bins.
# Reduced chi-squared = 0.8588 for 57 degrees of freedom
# Null hypothesis probability = 7.671582e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.167e-08 1.371e-08
25- 50 8.806e-08 2.174e-08
50-150 8.421e-08 4.484e-08
15-150 2.339e-07 7.331e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.19207 (-1.20393 2.25053)
R1^2/D10^2 : 2.60485E+04 (-22675.3 -22681.2)
kT2 [keV] : 9.72407 (-1.8976 6.85816)
R2^2/D10^2 : 0.129824 (-0.120735 0.102766)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.91 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.86 using 59 PHA bins.
# Reduced chi-squared = 0.8711 for 55 degrees of freedom
# Reduced chi-squared = 0.8701 for 55 degrees of freedom
# Null hypothesis probability = 7.399219e-01
# Null hypothesis probability = 7.416847e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.521e-08 1.941e-08
25- 50 9.457e-08 3.568e-08
50-150 4.866e-08 2.730e-08
15-150 1.984e-07 8.422e-08
Peak spectrum fit
Power-law model
Time interval is from 1.636 sec. to 2.636 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11152 ( -0.49368 0.585109 )
Norm@50keV : 4.04435E-03 ( -0.00164068 0.00160399 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.93 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 57 degrees of freedom
# Null hypothesis probability = 1.015701e-01
Photon flux (15-150 keV) in 1 sec: 0.639927 ( -0.180648 0.180892 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.76214e-08 ( -1.31569e-08 1.43611e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.636 sec. to 2.636 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.384398 ( -4.65659 2.53967 )
Epeak [keV] : 32.5445 ( -32.566 -32.566 )
Norm@50keV : 0.171703 ( -0.19796 249.404 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.78 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 56 degrees of freedom
# Null hypothesis probability = 1.173633e-01
Photon flux (15-150 keV) in 1 sec: 0.615106 ( -0.170651 0.173877 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.02177e-08 ( -9.5813e-09 1.40237e-08 ) ergs/cm2
Band function
Time interval is from 1.636 sec. to 2.636 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.85665 ( -4.85665 -4.85665 )
beta : -2.73041 ( -1.86815 0.819993 )
Epeak [keV] : 25.6128 ( -25.6128 7.0814 )
Norm@50keV : 557.934 ( -151.93 7.41033e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.81 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 55 degrees of freedom
# Null hypothesis probability = 9.975296e-02
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] : 8.45029 (-2.05813 2.55306)
R^2/D10^2 : 0.616853 (-0.402002 1.20608)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.96 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 57 degrees of freedom
# Null hypothesis probability = 1.330797e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.271e-09 4.991e-09
25- 50 1.588e-08 9.460e-09
50-150 4.978e-09 3.914e-09
15-150 2.913e-08 1.816e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 44.5288 (-21.6788 72.7091)
Norm : 3.94820 (-1.54026 2.65286)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.82 using 59 PHA bins.
# Reduced chi-squared = 1.225 for 57 degrees of freedom
# Null hypothesis probability = 1.185566e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.372e-09 4.520e-09
25- 50 1.289e-08 7.436e-09
50-150 1.117e-08 8.611e-09
15-150 3.343e-08 1.962e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 198.216 (-198.259 -198.259)
R1^2/D10^2 : 4.30807E-05 (-4.30431e-05 -4.30431e-05)
kT2 [keV] : 7.92955 (-2.0326 2.54551)
R2^2/D10^2 : 0.755937 (-0.502645 1.64302)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.67 using 59 PHA bins.
#Fit statistic : Chi-Squared = 67.87 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 55 degrees of freedom
# Reduced chi-squared = 1.234 for 55 degrees of freedom
# Null hypothesis probability = 1.017775e-01
# Null hypothesis probability = 1.141469e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.819e-09 4.782e-09
25- 50 1.501e-08 1.061e-08
50-150 6.429e-09 4.403e-09
15-150 3.026e-08 2.060e-08
Plot creation:
Sun Aug 19 00:19:40 EDT 2018