batgrbproduct analysis for trigger=885456
batgrbproduct Analysis for Trigger=885456
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): Fri Jan 25 01:43:23 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger885456/GCN5_download_cron
======================================================================
Trigger: 00885456 Segment: 000
BAT Trigger Time: 569992664 [s; MET]
Trigger Stop: 569992728 [s; MET]
UTC: 2019-01-24T03:17:21.699760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 247.797930440997 Dec: -47.8080145525352 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 13.83
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 13.83
Flight Position: [ source = BAT ]
RA: 247.797930440997 Dec: -47.8080145525352 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 247.86323990937 Dec: -47.8231868879717 [deg; J2000]
{ 16h 31m 27.2s , -47d 49' 23.5" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 6.56779894509466 [arcmin] (formal 1-sigma fit error)
SNR: -1.565436029675
Angular difference between Flight and Ground position is 2.784411 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 7.08799993991852 +/- 3.4867854000036
Measured from: -142.451999902725
to: -135.363999962807 [s; relative to TRIGTIME]
T50: 4.96399986743927 +/- 3.38096140824762
Measured from: -141.567999839783
to: -136.603999972343 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -136.972000002861
to: -135.972000002861 [s; relative to TRIGTIME]
Total Fluence
Measured from: -142.527999997139
to: -131.871999979019 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.092747 0.063716 0.024605 0.009430
0.024031 0.022040 0.018268 0.016371 [error]
Peak 0.015884 0.019472 0.006096 0.011651
0.007635 0.007009 0.005998 0.005254 [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 2.70e-08 2.54e-08 1.65e-08 1.67e-08 7.58e-08 8.56e-08 erg/cm2
Error 1.05e-08 1.14e-08 1.50e-08 3.37e-08 3.54e-08 5.55e-08 erg/cm2
Peak flux Power-law 1.16e-01 1.13e-01 7.66e-02 8.16e-02 3.38e-01 3.87e-01 ph/cm2/s
Error 9.13e-02 5.59e-02 6.19e-02 1.23e-01 1.59e-01 1.82e-01 ph/cm2/s
Fluence Cutoff-PL 2.72e-08 2.52e-08 1.61e-08 1.57e-08 7.50e-08 8.41e-08 erg/cm2
Error 1.05e-08 1.20e-08 1.70e-08 3.35e-08 3.53e-08 5.41e-08 erg/cm2
Peak flux Cutoff-PL 1.10e-01 1.15e-01 7.83e-02 6.09e-02 3.33e-01 3.65e-01 ph/cm2/s
Error 1.01e-01 6.57e-02 4.12e-02 7.99e-02 1.79e-01 2.14e-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 2.618 0.961 - - 7.40e-04 6.19e-04 68.090 57
CPL 3.183 0.000 353.3 0.0 3.87e-04 0.00e+00 67.760 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.557 0.978 - - 2.66e-03 1.34e-03 54.050 57
CPL 1.441 0.000 242.9 0.0 3.04e-03 1.38e+03 54.040 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 10.656 -142.528 -131.872
T90 7.088 -142.452 -135.364
T50 4.964 -141.568 -136.604
Peak 1.000 -136.972 -135.972
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
247.8632 -47.8232 0.1236 5.3 106.7 -0.0633 -1.6 TRIG_00885456
------------------------------------------
Foreground time interval of the image:
-142.528 -132.760 (delta_t = 9.768 [sec])
-132.000 -131.872 (delta_t = 0.128 [sec])
Background time interval of the image:
-239.000 -142.528 (delta_t = 96.472 [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
-142.528000 -132.760000
-132.000000 -131.872000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.61829 ( -0.767057 1.15534 )
Norm@50keV : 7.39986E-04 ( -0.000739977 0.000498688 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.09 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 57 degrees of freedom
# Null hypothesis probability = 1.493162e-01
Photon flux (15-150 keV) in 9.896 sec: 0.156575 ( -0.0514277 0.0514582 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.58092e-08 ( -3.28038e-08 3.7918e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-142.528000 -132.760000
-132.000000 -131.872000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.18334 ( -1.98497 -1.98497 )
Epeak [keV] : 353.298 ( )
Norm@50keV : 3.86924E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.76 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 56 degrees of freedom
# Null hypothesis probability = 1.347732e-01
Photon flux (15-150 keV) in 9.896 sec: 0.155612 ( -0.050735 0.051984 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.50235e-08 ( -3.24752e-08 3.81136e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-142.528000 -132.760000
-132.000000 -131.872000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.98716 ( 9.98716 9.98716 )
beta : -2.61830 ( -1.15552 0.766983 )
Epeak [keV] : 6.66051 ( -6.66051 -6.66051 )
Norm@50keV : 0.100574 ( -0.100574 0.067778 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.09 using 59 PHA bins.
# Reduced chi-squared = 1.238 for 55 degrees of freedom
# Null hypothesis probability = 1.106439e-01
Photon flux (15-150 keV) in 9.896 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] : 5.70246 (-2.58447 4.89658)
R^2/D10^2 : 0.661768 (-0.639142 11.263)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.96 using 59 PHA bins.
# Reduced chi-squared = 1.263 for 57 degrees of freedom
# Null hypothesis probability = 8.755662e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.620e-08 1.589e-08
25- 50 2.334e-08 1.574e-08
50-150 1.727e-09 1.714e-09
15-150 5.128e-08 3.230e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.9660 (-17.8279 65.9983)
Norm : 1.31699 (-0.727871 3.18304)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.08 using 59 PHA bins.
# Reduced chi-squared = 1.212 for 57 degrees of freedom
# Null hypothesis probability = 1.310846e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.554e-08 1.557e-08
25- 50 2.805e-08 1.769e-08
50-150 1.398e-08 1.177e-08
15-150 6.757e-08 4.431e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.94030 (-2.16377 3.49125)
R1^2/D10^2 : 12.7744 (-12.4184 850.257)
kT2 [keV] : 12.6492 (-6.60828 -12.6416)
R2^2/D10^2 : 1.89069E-02 (-0.0189196 0.41254)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.64 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 55 degrees of freedom
# Null hypothesis probability = 1.177625e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.719e-08 1.556e-08
25- 50 2.405e-08 1.420e-08
50-150 2.112e-08 1.465e-08
15-150 7.236e-08 4.019e-08
Peak spectrum fit
Power-law model
Time interval is from -136.972 sec. to -135.972 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55686 ( -0.92135 1.03553 )
Norm@50keV : 2.66313E-03 ( -0.00139723 0.00127912 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.05 using 59 PHA bins.
# Reduced chi-squared = 0.9482 for 57 degrees of freedom
# Null hypothesis probability = 5.864788e-01
Photon flux (15-150 keV) in 1 sec: 0.337811 ( -0.15853 0.159808 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50469e-08 ( -1.29534e-08 1.37139e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -136.972 sec. to -135.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44060 ( -1.43244 -1.43244 )
Epeak [keV] : 242.920 ( -220.726 -220.726 )
Norm@50keV : 3.04300E-03 ( -0.00312393 2765.38 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.04 using 59 PHA bins.
# Reduced chi-squared = 0.9650 for 56 degrees of freedom
# Null hypothesis probability = 5.493652e-01
Photon flux (15-150 keV) in 1 sec: 0.333173 ( -0.194663 0.163165 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45954e-08 ( -1.34789e-08 1.40523e-08 ) ergs/cm2
Band function
Time interval is from -136.972 sec. to -135.972 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.983751 ( 0.982948 0.982948 )
beta : -2.31363 ( 2.29369 2.29369 )
Epeak [keV] : 80.0517 ( -82.5189 -82.5189 )
Norm@50keV : 5.45858E-03 ( -0.00536455 0.0561818 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.06 using 59 PHA bins.
# Reduced chi-squared = 0.9829 for 55 degrees of freedom
# Null hypothesis probability = 5.105896e-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] : 15.3325 (-6.32702 13.4935)
R^2/D10^2 : 3.53728E-02 (-0.0353717 0.192384)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.56 using 59 PHA bins.
# Reduced chi-squared = 0.9571 for 57 degrees of freedom
# Null hypothesis probability = 5.673013e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.734e-09 1.198e-09
25- 50 7.030e-09 4.541e-09
50-150 1.136e-08 8.265e-09
15-150 2.012e-08 1.400e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 1.37198 (-0.633338 1.14588)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.05 using 59 PHA bins.
# Reduced chi-squared = 0.9482 for 57 degrees of freedom
# Null hypothesis probability = 5.866037e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.416e-09 2.297e-09
25- 50 6.572e-09 4.466e-09
50-150 1.441e-08 9.345e-09
15-150 2.440e-08 1.645e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.92502 (-2.10465 20.896)
R1^2/D10^2 : 337.269 (-178.973 -178.973)
kT2 [keV] : 17.3414 (-7.35572 20.1752)
R2^2/D10^2 : 2.16062E-02 (-0.0219354 0.0760825)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.54 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.51 using 59 PHA bins.
# Reduced chi-squared = 0.9552 for 55 degrees of freedom
# Reduced chi-squared = 0.9547 for 55 degrees of freedom
# Null hypothesis probability = 5.692574e-01
# Null hypothesis probability = 5.703508e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.688e-09 1.622e-09
25- 50 5.922e-09 3.680e-09
50-150 1.292e-08 9.525e-09
15-150 2.253e-08 1.418e-08
Plot creation:
Fri Jan 25 01:47:07 EST 2019