batgrbproduct analysis for trigger=889483
batgrbproduct Analysis for Trigger=889483
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): Tue Feb 19 08:15:24 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger889483/GCN5_download_cron
======================================================================
Trigger: 00889483 Segment: 000
BAT Trigger Time: 572172872 [s; MET]
Trigger Stop: 572173192 [s; MET]
UTC: 2019-02-18T08:54:09.562760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 284.639647693538 Dec: -8.23516688247093 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.54
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.54
Flight Position: [ source = BAT ]
RA: 284.639647693538 Dec: -8.23516688247093 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 284.696128508164 Dec: -8.19500882405794 [deg; J2000]
{ 18h 58m 47.1s , -08d 11' 42.0" }
+/- 3.91937104798457 [arcmin] (estimated 90% radius based on SNR)
+/- 2.64018965664387 [arcmin] (formal 1-sigma fit error)
SNR: 4.32181734617424
Angular difference between Flight and Ground position is 4.129822 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 254.81199991703 +/- 56.4983984064395
Measured from: 25.5440001487732
to: 280.356000065804 [s; relative to TRIGTIME]
T50: 135.711999893188 +/- 54.4918872408721
Measured from: 76.5080001354218
to: 212.22000002861 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 186.108000040054
to: 187.108000040054 [s; relative to TRIGTIME]
Total Fluence
Measured from: 14.8359999656677
to: 304.715999960899 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.725329 0.726832 0.170357 0.060120
0.125742 0.113728 0.093974 0.079078 [error]
Peak 0.020172 0.018770 0.005739 0.005469
0.008173 0.007393 0.006082 0.005205 [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 2.18e-07 2.46e-07 1.98e-07 2.64e-07 7.59e-07 9.26e-07 erg/cm2
Error 5.10e-08 5.10e-08 7.65e-08 1.95e-07 1.81e-07 3.02e-07 erg/cm2
Peak flux Power-law 1.86e-01 1.24e-01 5.36e-02 3.19e-02 3.80e-01 3.96e-01 ph/cm2/s
Error 1.11e-01 6.05e-02 4.65e-02 6.06e-02 1.69e-01 1.79e-01 ph/cm2/s
Fluence Cutoff-PL 2.18e-07 2.97e-07 4.20e-08 1.47e-10 5.58e-07 5.58e-07 erg/cm2
Error 5.78e-08 7.76e-08 9.53e-08 3.55e-08 1.61e-07 1.66e-07 erg/cm2
Peak flux Cutoff-PL 1.88e-01 1.23e-01 5.22e-02 2.98e-02 3.79e-01 3.95e-01 ph/cm2/s
Error 1.50e-01 7.13e-02 4.69e-02 6.03e-02 1.69e-01 1.76e-01 ph/cm2/s
Fluence Band 2.60e-07 2.74e-07 9.64e-08 4.37e-08 6.57e-07 6.78e-07 erg/cm2
Error 6.57e-08 7.67e-08 -------- -------- 1.85e-07 -------- 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 2.314 0.378 - - 3.36e-04 9.62e-05 66.110 57
CPL -0.877 5.763 27.2 0.0 5.45e-02 0.00e+00 62.000 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.208 1.134 - - 2.28e-03 1.87e-03 40.880 57
CPL 1.780 0.000 27.1 0.0 3.75e-03 0.00e+00 40.990 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 289.880 14.836 304.716
T90 254.812 25.544 280.356
T50 135.712 76.508 212.220
Peak 1.000 186.108 187.108
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
284.6961 -8.1950 0.0446 6.7 -116.0 2.6429 4.3 TRIG_00889483
------------------------------------------
Foreground time interval of the image:
14.836 123.111 (delta_t = 108.275 [sec])
177.000 304.716 (delta_t = 127.716 [sec])
Background time interval of the image:
-14.899 14.836 (delta_t = 29.735 [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
Multiple GTIs in the spectrum
tstart tstop
14.836000 123.110600
177.000000 304.716000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.31396 ( -0.357221 0.398327 )
Norm@50keV : 3.35629E-04 ( -9.6344e-05 9.61149e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.11 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 57 degrees of freedom
# Null hypothesis probability = 1.912077e-01
Photon flux (15-150 keV) in 236 sec: 5.91132E-02 ( -0.0112042 0.0112071 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.58931e-07 ( -1.75948e-07 1.86976e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
14.836000 123.110600
177.000000 304.716000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.876943 ( -8.82056 2.70552 )
Epeak [keV] : 27.1940 ( )
Norm@50keV : 5.45463E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.00 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 56 degrees of freedom
# Null hypothesis probability = 2.709276e-01
Photon flux (15-150 keV) in 236 sec: 5.49910E-02 ( -0.0110077 0.0111667 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.57805e-07 ( -1.30314e-07 1.91495e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
14.836000 123.110600
177.000000 304.716000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5.09774 -5 )
beta : -3.37853 ( -2.93864 0.849701 )
Epeak [keV] : 25.5447 ( -4.67205 3.63311 )
Norm@50keV : 72.5305 ( -13.1441 200.898 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.02 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 55 degrees of freedom
# Null hypothesis probability = 3.309533e-01
Photon flux (15-150 keV) in 236 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.56734e-07 ( -6.55082e-07 -1.67673e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.97184 (-1.12726 1.40002)
R^2/D10^2 : 0.119176 (-0.0639816 0.131118)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.96 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.035863e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.187e-07 7.645e-08
25- 50 2.972e-07 1.036e-07
50-150 4.853e-08 3.284e-08
15-150 5.644e-07 1.835e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 33.6259 (-11.8032 23.4287)
Norm : 0.438730 (-0.141999 0.218736)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.80 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 57 degrees of freedom
# Null hypothesis probability = 2.497581e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.224e-07 5.907e-08
25- 50 2.699e-07 7.856e-08
50-150 1.708e-07 1.140e-07
15-150 6.630e-07 1.979e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.64037 (-1.31481 1.20991)
R1^2/D10^2 : 0.141244 (-0.0616625 0.167578)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 3.86417E-06 (-3.56052e-06 3.40182e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.01 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.98 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 55 degrees of freedom
# Reduced chi-squared = 1.072 for 55 degrees of freedom
# Null hypothesis probability = 3.311651e-01
# Null hypothesis probability = 3.321750e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.201e-07 1.096e-07
25- 50 2.893e-07 1.229e-07
50-150 2.703e-07 4.462e-08
15-150 7.797e-07 2.316e-07
Peak spectrum fit
Power-law model
Time interval is from 186.108 sec. to 187.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.20786 ( -0.900416 1.36679 )
Norm@50keV : 2.28328E-03 ( -0.00228328 0.0014641 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.88 using 59 PHA bins.
# Reduced chi-squared = 0.7172 for 57 degrees of freedom
# Null hypothesis probability = 9.471287e-01
Photon flux (15-150 keV) in 1 sec: 0.379574 ( -0.168713 0.168744 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14917e-08 ( -1.17078e-08 1.30886e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 186.108 sec. to 187.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77978 ( )
Epeak [keV] : 27.1061 ( )
Norm@50keV : 3.74921E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.99 using 59 PHA bins.
# Reduced chi-squared = 0.7320 for 56 degrees of freedom
# Null hypothesis probability = 9.338291e-01
Photon flux (15-150 keV) in 1 sec: 0.379355 ( -0.168684 0.16843 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.12516e-08 ( -1.16238e-08 1.3153e-08 ) ergs/cm2
Band function
Time interval is from 186.108 sec. to 187.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.61348 ( 1.61495 1.61495 )
beta : -2.20594 ( 2.20693 0.896742 )
Epeak [keV] : 9.13364 ( -8.73463 -8.73463 )
Norm@50keV : 8.78415E-03 ( -0.00897501 58.6821 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.88 using 59 PHA bins.
# Reduced chi-squared = 0.7432 for 55 degrees of freedom
# Null hypothesis probability = 9.218642e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.78277e-09 ( -2.77577e-09 -7.1048e-10 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.1331 (-6.17582 7.2914)
R^2/D10^2 : 0.163189 (-0.162864 7.61486)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.64 using 59 PHA bins.
# Reduced chi-squared = 0.7481 for 57 degrees of freedom
# Null hypothesis probability = 9.213176e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.428e-09 2.242e-09
25- 50 8.682e-09 5.680e-09
50-150 4.707e-09 4.309e-09
15-150 1.682e-08 1.117e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 50.6390 (-50.6385 -50.6385)
Norm : 2.12307 (-1.20419 4.82739)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.15 using 59 PHA bins.
# Reduced chi-squared = 0.7219 for 57 degrees of freedom
# Null hypothesis probability = 9.436124e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.206e-09 3.381e-09
25- 50 7.511e-09 4.840e-09
50-150 7.380e-09 6.460e-09
15-150 2.010e-08 1.428e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.83743 (-2.83743 26.1158)
R1^2/D10^2 : 30.5619 (-30.5621 -30.5621)
kT2 [keV] : 13.3886 (-13.3886 -13.3886)
R2^2/D10^2 : 4.61637E-02 (-0.0461638 0.284605)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.07 using 59 PHA bins.
# Reduced chi-squared = 0.7285 for 55 degrees of freedom
# Null hypothesis probability = 9.348289e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.762e-09 2.691e-09
25- 50 6.710e-09 4.260e-09
50-150 7.182e-09 5.145e-09
15-150 1.965e-08 1.133e-08
Plot creation:
Tue Feb 19 08:20:09 EST 2019