batgrbproduct analysis for trigger=814677
batgrbproduct Analysis for Trigger=814677
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 Mar 17 10:46:49 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger814677/GCN5_download_cron
======================================================================
Trigger: 00814677 Segment: 000
BAT Trigger Time: 542869065.728 [s; MET]
Trigger Stop: 542869067.776 [s; MET]
UTC: 2018-03-16T04:57:25.096800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 265.436483229163 Dec: 0.736518945680564 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.43
Image Trigger?: NO
Rate S/N Ratio: 21.51743479135 [ if not an image trigger ]
Image S/N Ratio: 9.43
Flight Position: [ source = BAT ]
RA: 265.436483229163 Dec: 0.736518945680564 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 265.421875087648 Dec: 0.737307966474289 [deg; J2000]
{ 17h 41m 41.3s , +00d 44' 14.3" }
+/- 1.45341101967127 [arcmin] (estimated 90% radius based on SNR)
+/- 0.611808895292724 [arcmin] (formal 1-sigma fit error)
SNR: 17.8293241934772
Angular difference between Flight and Ground position is 0.877694 arcmin
Partial Coding Fraction: 0.2929688 [ including projection effects ]
Duration
T90: 87 +/- 20.591260281974
Measured from: -61.7279999256134
to: 25.2720000743866 [s; relative to TRIGTIME]
T50: 16 +/- 4.24264068711928
Measured from: -7.7279999256134
to: 8.2720000743866 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.27199995517731
to: 2.27199995517731 [s; relative to TRIGTIME]
Total Fluence
Measured from: -79.7280000448227
to: 37.2719999551773 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.696833 2.863694 1.968227 0.723126
0.176483 0.175115 0.149409 0.118905 [error]
Peak 0.061381 0.175634 0.114610 0.069585
0.017344 0.018958 0.016530 0.013313 [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 6.30e-07 1.19e-06 1.73e-06 5.38e-06 4.91e-06 8.94e-06 erg/cm2
Error 8.16e-08 9.22e-08 1.47e-07 1.01e-06 3.63e-07 1.10e-06 erg/cm2
Peak flux Power-law 8.77e-01 1.05e+00 9.15e-01 1.36e+00 3.32e+00 4.20e+00 ph/cm2/s
Error 2.35e-01 1.73e-01 1.32e-01 4.22e-01 4.67e-01 5.66e-01 ph/cm2/s
Fluence Cutoff-PL 6.25e-07 1.19e-06 1.74e-06 4.97e-06 4.92e-06 8.53e-06 erg/cm2
Error 8.92e-08 9.97e-08 1.55e-07 1.61e-06 3.76e-07 1.86e-06 erg/cm2
Peak flux Cutoff-PL 8.84e-01 1.06e+00 9.13e-01 1.34e+00 3.33e+00 4.20e+00 ph/cm2/s
Error 2.35e-01 1.79e-01 1.40e-01 5.05e-01 4.64e-01 7.27e-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 1.457 0.122 - - 4.39e-03 3.04e-04 58.160 57
CPL 1.454 0.301 10000.0 0.0 4.41e-03 3.04e-04 58.160 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.203 0.231 - - 2.83e-02 3.75e-03 70.120 57
CPL 2.330 0.260 111.0 0.0 4.48e-03 5.00e-03 69.390 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: 24.640000 sec.
T50 in the 50-300 keV band: 9.152000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 117.000 -79.728 37.272
T90 87.000 -61.728 25.272
T50 16.000 -7.728 8.272
Peak 1.000 1.272 2.272
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
265.4219 +0.7373 0.0108 38.9 42.8 8.1529 17.8 TRIG_00814677
------------------------------------------
Foreground time interval of the image:
-79.728 24.173 (delta_t = 103.901 [sec])
Background time interval of the image:
-167.227 -79.728 (delta_t = 87.499 [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 -79.728 sec. to 37.272 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45708 ( -0.122366 0.121558 )
Norm@50keV : 4.39417E-03 ( -0.000303829 0.000303672 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.16 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 57 degrees of freedom
# Null hypothesis probability = 4.323346e-01
Photon flux (15-150 keV) in 117 sec: 0.542478 ( -0.039991 0.0401017 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.91337e-06 ( -3.6213e-07 3.63761e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -79.728 sec. to 37.272 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45422 ( -0.464923 0.136377 )
Epeak [keV] : 10000.00 ( -10000 -10000 )
Norm@50keV : 4.40863E-03 ( -0.000304595 0.000304137 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.16 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 56 degrees of freedom
# Null hypothesis probability = 3.957182e-01
Photon flux (15-150 keV) in 117 sec: 0.541453 ( -0.040625 0.04091 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.92145e-06 ( -3.97168e-07 3.55001e-07 ) ergs/cm2
Band function
Time interval is from -79.728 sec. to 37.272 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.76143 ( -13.0449 -4.3331 )
beta : -1.54939 ( -0.15935 0.141802 )
Epeak [keV] : 27.5414 ( -9.7915 4.56405 )
Norm@50keV : 33.4045 ( -33.4047 80.8614 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.05 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 55 degrees of freedom
# Null hypothesis probability = 4.727035e-01
Photon flux (15-150 keV) in 117 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] : 15.8299 ( )
R^2/D10^2 : 5.03343E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 116.83 using 59 PHA bins.
# Reduced chi-squared = 2.0497 for 57 degrees of freedom
# Null hypothesis probability = 5.206173e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.058e-07 4.177e-08
25- 50 1.275e-06 1.296e-07
50-150 2.224e-06 2.767e-07
15-150 3.805e-06 3.258e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-31.2886 -200)
Norm : 2.24699 (-0.155445 0.155445)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.25 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 57 degrees of freedom
# Null hypothesis probability = 3.261379e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.547e-07 5.558e-08
25- 50 1.259e-06 1.281e-07
50-150 2.762e-06 6.926e-07
15-150 4.676e-06 8.611e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.86200 (-1.51763 1.65662)
R1^2/D10^2 : 0.290967 (-0.123164 0.24569)
kT2 [keV] : 43.5920 (-13.3179 45.0924)
R2^2/D10^2 : 1.35901E-03 (-0.00110198 0.00285208)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.99 using 59 PHA bins.
# Reduced chi-squared = 0.9817 for 55 degrees of freedom
# Null hypothesis probability = 5.132016e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.529e-07 1.238e-07
25- 50 1.327e-06 2.620e-07
50-150 3.096e-06 1.361e-06
15-150 4.976e-06 1.579e-06
Peak spectrum fit
Power-law model
Time interval is from 1.272 sec. to 2.272 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20345 ( -0.235594 0.226052 )
Norm@50keV : 2.83062E-02 ( -0.003754 0.0037445 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.12 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 57 degrees of freedom
# Null hypothesis probability = 1.136947e-01
Photon flux (15-150 keV) in 1 sec: 3.32419 ( -0.46543 0.468124 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86898e-07 ( -3.99374e-08 4.01757e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.272 sec. to 2.272 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.32988 ( -0.295566 0.224929 )
Epeak [keV] : 110.976 ( -9999.36 -9999.36 )
Norm@50keV : 4.47563E-03 ( -0.00447826 0.00551504 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.39 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 56 degrees of freedom
# Null hypothesis probability = 1.078242e-01
Photon flux (15-150 keV) in 1 sec: 3.32902 ( -0.47031 0.45798 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.8669e-07 ( -2.069e-08 4.0155e-08 ) ergs/cm2
Band function
Time interval is from 1.272 sec. to 2.272 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.52942 ( -8.29447 -4.52942 )
beta : -1.50981 ( -0.374036 0.333283 )
Epeak [keV] : 36.9822 ( -7.85295 14.5073 )
Norm@50keV : 131.532 ( -17.1046 2903.96 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.04 using 59 PHA bins.
# Reduced chi-squared = 1.219 for 55 degrees of freedom
# Null hypothesis probability = 1.279396e-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] : 16.6419 (-2.99016 4.41538)
R^2/D10^2 : 0.276706 (-0.151154 0.274677)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.04 using 59 PHA bins.
# Reduced chi-squared = 1.510 for 57 degrees of freedom
# Null hypothesis probability = 7.750082e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.570e-08 4.390e-09
25- 50 6.826e-08 1.555e-08
50-150 1.340e-07 3.617e-08
15-150 2.180e-07 4.340e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-40.7482 -200)
Norm : 14.0701 (-1.89007 1.89007)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.95 using 59 PHA bins.
# Reduced chi-squared = 1.350 for 57 degrees of freedom
# Null hypothesis probability = 4.031878e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.506e-08 2.000e-08
25- 50 6.744e-08 3.741e-08
50-150 1.479e-07 8.110e-08
15-150 2.504e-07 1.403e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.6161 (-2.184 2.05806)
R1^2/D10^2 : 1.02788 (-0.423105 0.859099)
kT2 [keV] : 98.8378 (-150.167 -199.363)
R2^2/D10^2 : 1.61408E-03 (-0.000140261 0.00667115)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.85 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 55 degrees of freedom
# Null hypothesis probability = 2.447841e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.498e-08 1.129e-08
25- 50 7.263e-08 3.435e-08
50-150 1.926e-07 1.588e-07
15-150 2.902e-07 1.914e-07
Plot creation:
Sat Mar 17 10:54:41 EDT 2018