batgrbproduct analysis for trigger=873186
batgrbproduct Analysis for Trigger=873186
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 Nov 24 07:52:18 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger873186/GCN5_download_cron
======================================================================
Trigger: 00873186 Segment: 000
BAT Trigger Time: 564644005.056 [s; MET]
Trigger Stop: 564644005.312 [s; MET]
UTC: 2018-11-23T05:33:03.090320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 184.347946931295 Dec: 14.5895052083792 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.8
Image Trigger?: NO
Rate S/N Ratio: 33.1058907144937 [ if not an image trigger ]
Image S/N Ratio: 8.8
Flight Position: [ source = BAT ]
RA: 184.347946931295 Dec: 14.5895052083792 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 184.354051373542 Dec: 14.6192269103367 [deg; J2000]
{ 12h 17m 25.0s , +14d 37' 09.2" }
+/- 1.89500379364414 [arcmin] (estimated 90% radius based on SNR)
+/- 0.846026751967594 [arcmin] (formal 1-sigma fit error)
SNR: 12.2048528065837
Angular difference between Flight and Ground position is 1.818183 arcmin
Partial Coding Fraction: 0.59375 [ including projection effects ]
Duration
T90: 0.259999990463257 +/- 0.0417612136127632
Measured from: 0.0400000810623169
to: 0.300000071525574 [s; relative to TRIGTIME]
T50: 0.123999953269958 +/- 0.0481663422800704
Measured from: 0.0880001783370972
to: 0.212000131607056 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.325999975204468
to: 0.674000024795532 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0320000648498535
to: 0.312000036239624 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.024489 0.043498 0.063709 0.031771
0.006374 0.007764 0.008040 0.006949 [error]
Peak 0.030645 0.036117 0.075337 0.029138
0.009979 0.011160 0.010689 0.009143 [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 6.26e-09 1.87e-08 4.55e-08 3.09e-07 1.23e-07 3.80e-07 erg/cm2
Error 2.19e-09 3.85e-09 7.06e-09 1.20e-07 1.97e-08 1.22e-07 erg/cm2
Peak flux Power-law 2.00e-01 3.39e-01 4.37e-01 1.14e+00 1.29e+00 2.11e+00 ph/cm2/s
Error 1.02e-01 1.04e-01 8.07e-02 5.14e-01 2.58e-01 4.90e-01 ph/cm2/s
Fluence Cutoff-PL 6.38e-09 1.89e-08 4.55e-08 3.01e-07 1.23e-07 3.70e-07 erg/cm2
Error 2.24e-09 -------- 7.50e-09 1.63e-07 1.96e-08 1.63e-07 erg/cm2
Peak flux Cutoff-PL 2.02e-01 3.41e-01 4.37e-01 1.12e+00 1.29e+00 2.10e+00 ph/cm2/s
Error 1.14e-01 -------- 8.08e-02 6.40e-01 2.56e-01 6.44e-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 0.715 0.283 - - 3.63e-02 5.80e-03 71.770 57
CPL 0.707 0.433 10000.0 0.0 3.66e-02 5.64e-03 71.790 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.631 0.388 - - 1.11e-02 2.45e-03 66.500 57
CPL 0.621 0.916 10000.0 0.0 1.12e-02 -4.31e-03 66.500 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: 0.320000 sec.
T50 in the 50-300 keV band: 0.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.280 0.032 0.312
T90 0.260 0.040 0.300
T50 0.124 0.088 0.212
Peak 1.000 -0.326 0.674
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
184.3541 +14.6192 0.0157 27.6 39.8 0.1830 12.2 TRIG_00873186
------------------------------------------
Foreground time interval of the image:
0.032 0.312 (delta_t = 0.280 [sec])
Background time interval of the image:
-122.555 -43.046 (delta_t = 79.509 [sec])
-38.056 0.032 (delta_t = 38.088 [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 0.032 sec. to 0.312 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.715297 ( -0.294461 0.271971 )
Norm@50keV : 3.63266E-02 ( -0.00587862 0.00571847 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.77 using 59 PHA bins.
# Reduced chi-squared = 1.259 for 57 degrees of freedom
# Null hypothesis probability = 8.999711e-02
Photon flux (15-150 keV) in 0.28 sec: 4.19416 ( -0.637147 0.640348 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23308e-07 ( -1.9636e-08 1.97316e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.032 sec. to 0.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.707318 ( -0.507559 0.358331 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 3.66029E-02 ( -0.00590903 0.00536882 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.79 using 59 PHA bins.
# Reduced chi-squared = 1.282 for 56 degrees of freedom
# Null hypothesis probability = 7.600073e-02
Photon flux (15-150 keV) in 0.28 sec: 4.19156 ( -0.6356 0.63202 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22882e-07 ( -1.9124e-08 2.0118e-08 ) ergs/cm2
Band function
Time interval is from 0.032 sec. to 0.312 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.968906 ( 0.968906 0.968906 )
beta : -0.715296 ( -0.271891 0.29446 )
Epeak [keV] : 13.2533 ( -13.2533 -13.2533 )
Norm@50keV : 5.32342E-02 ( -0.0225975 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.77 using 59 PHA bins.
# Reduced chi-squared = 1.305 for 55 degrees of freedom
# Null hypothesis probability = 6.389881e-02
Photon flux (15-150 keV) in 0.28 sec: 1.64266E-02 ( ) 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] : 30.1171 (-6.61666 10.0731)
R^2/D10^2 : 6.26029E-02 (-0.0338455 0.0651382)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.53 using 59 PHA bins.
# Reduced chi-squared = 1.413 for 57 degrees of freedom
# Null hypothesis probability = 2.180244e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.481e-09 8.785e-10
25- 50 1.533e-08 4.840e-09
50-150 9.808e-08 2.993e-08
15-150 1.159e-07 3.051e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-32.3074 -200)
Norm : 15.8209 (-2.61714 2.61714)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.80 using 59 PHA bins.
# Reduced chi-squared = 1.698 for 57 degrees of freedom
# Null hypothesis probability = 7.897001e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.113e-08 6.336e-09
25- 50 2.142e-08 1.233e-08
50-150 4.697e-08 2.716e-08
15-150 7.953e-08 4.470e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.44602 (-4.07668 6.35343)
R1^2/D10^2 : 1.46717 (-1.18021 13.0382)
kT2 [keV] : 48.4053 (-17.1816 -48.4112)
R2^2/D10^2 : 1.58063E-02 (-0.0123762 0.0382187)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.98 using 59 PHA bins.
# Reduced chi-squared = 1.290 for 55 degrees of freedom
# Null hypothesis probability = 7.231587e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.661e-09 3.984e-09
25- 50 1.888e-08 1.049e-08
50-150 1.018e-07 5.496e-08
15-150 1.274e-07 6.695e-08
Peak spectrum fit
Power-law model
Time interval is from -0.326 sec. to 0.674 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.630917 ( -0.411867 0.364641 )
Norm@50keV : 1.10735E-02 ( -0.00253022 0.00237523 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.50 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 57 degrees of freedom
# Null hypothesis probability = 1.824924e-01
Photon flux (15-150 keV) in 1 sec: 1.28830 ( -0.256403 0.258972 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39542e-07 ( -2.68551e-08 2.69297e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.326 sec. to 0.674 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.621348 ( -1.36281 0.468281 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 1.11588E-02 ( -0.00254131 -0.0111599 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.50 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 56 degrees of freedom
# Null hypothesis probability = 1.589882e-01
Photon flux (15-150 keV) in 1 sec: 1.29082 ( -0.25919 0.25272 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39295e-07 ( -2.6584e-08 2.7117e-08 ) ergs/cm2
Band function
Time interval is from -0.326 sec. to 0.674 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.792895 ( 0.792573 0.792573 )
beta : -0.630929 ( -0.364648 0.411905 )
Epeak [keV] : 16.2016 ( -16.204 -16.204 )
Norm@50keV : 1.59670E-02 ( -0.00737639 203108 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.50 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 55 degrees of freedom
# Null hypothesis probability = 1.377692e-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] : 34.2119 (-8.92859 16.4652)
R^2/D10^2 : 1.38123E-02 (-0.00871155 0.018566)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.27 using 59 PHA bins.
# Reduced chi-squared = 1.233 for 57 degrees of freedom
# Null hypothesis probability = 1.113950e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.325e-09 1.188e-09
25- 50 1.508e-08 5.693e-09
50-150 1.171e-07 4.925e-08
15-150 1.344e-07 5.413e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-44.1591 -200)
Norm : 5.16465 (-1.0782 1.0782)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.49 using 59 PHA bins.
# Reduced chi-squared = 1.482 for 57 degrees of freedom
# Null hypothesis probability = 1.048367e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.286e-08 7.630e-09
25- 50 2.473e-08 1.460e-08
50-150 5.425e-08 3.128e-08
15-150 9.184e-08 5.325e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.95240 (-3.31456 4.03443)
R1^2/D10^2 : 2.95087 (-2.8811 1937.19)
kT2 [keV] : 41.0794 (-12.6983 64.5288)
R2^2/D10^2 : 8.17584E-03 (-0.00748059 0.0142649)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.37 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 55 degrees of freedom
# Null hypothesis probability = 1.597194e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.652e-09 5.288e-09
25- 50 1.641e-08 7.851e-09
50-150 1.187e-07 6.719e-08
15-150 1.438e-07 7.745e-08
Plot creation:
Sat Nov 24 07:56:04 EST 2018