batgrbproduct analysis for trigger=842475
batgrbproduct Analysis for Trigger=842475
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): Mon Jun 18 22:04:40 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger842475/GCN5_download_cron
======================================================================
Trigger: 00842475 Segment: 000
BAT Trigger Time: 550975414.224 [s; MET]
Trigger Stop: 550975414.288 [s; MET]
UTC: 2018-06-18T00:43:13.101380 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 169.936701156196 Dec: 73.8479030299687 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.55
Image Trigger?: NO
Rate S/N Ratio: 43.8406204335659 [ if not an image trigger ]
Image S/N Ratio: 9.55
Flight Position: [ source = BAT ]
RA: 169.936701156196 Dec: 73.8479030299687 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 169.949151526217 Dec: 73.8241389634139 [deg; J2000]
{ 11h 19m 47.8s , +73d 49' 26.9" }
+/- 1.5160801964155 [arcmin] (estimated 90% radius based on SNR)
+/- 0.689034271163198 [arcmin] (formal 1-sigma fit error)
SNR: 16.7858695789995
Angular difference between Flight and Ground position is 1.440930 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 47.3599998950958 +/- 11.20164564161
Measured from: 0.00800013542175293
to: 47.3680000305176 [s; relative to TRIGTIME]
T50: 20.8639998435974 +/- 11.2787177144382
Measured from: 0.904000163078308
to: 21.7680000066757 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0759999752044678
to: 0.924000024795532 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0559999942779541
to: 56.3280000686646 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.340026 0.288401 0.341540 0.073390
0.048987 0.048054 0.042474 0.037824 [error]
Peak 0.046214 0.091487 0.104424 0.041850
0.008200 0.008903 0.009147 0.007708 [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 7.91e-08 1.56e-07 2.40e-07 8.05e-07 6.71e-07 1.28e-06 erg/cm2
Error 2.13e-08 2.40e-08 4.27e-08 3.36e-07 1.04e-07 3.61e-07 erg/cm2
Peak flux Power-law 4.63e-01 6.40e-01 6.52e-01 1.21e+00 2.14e+00 2.97e+00 ph/cm2/s
Error 9.61e-02 7.99e-02 6.97e-02 2.86e-01 2.16e-01 3.28e-01 ph/cm2/s
Fluence Cutoff-PL 7.96e-08 1.56e-07 2.41e-07 7.46e-07 6.72e-07 1.22e-06 erg/cm2
Error 2.14e-08 2.36e-08 4.23e-08 3.80e-07 1.02e-07 4.30e-07 erg/cm2
Peak flux Cutoff-PL 4.57e-01 6.38e-01 6.54e-01 1.22e+00 2.14e+00 2.97e+00 ph/cm2/s
Error 1.13e-01 8.29e-02 7.86e-02 4.51e-01 2.19e-01 4.82e-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 1.382 0.269 - - 1.23e-03 1.68e-04 76.010 57
CPL 3.320 0.631 353.8 -148.2 1.50e-04 3.04e-04 74.020 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.971 0.176 - - 1.86e-02 1.85e-03 46.330 57
CPL 0.965 0.434 9998.0 0.0 1.88e-02 1.03e-02 46.330 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: 1.408000 sec.
T50 in the 50-300 keV band: 0.640000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 56.384 -0.056 56.328
T90 47.360 0.008 47.368
T50 20.864 0.904 21.768
Peak 1.000 -0.076 0.924
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
169.9492 +73.8241 0.0114 29.8 20.7 0.7205 16.8 TRIG_00842475
------------------------------------------
Foreground time interval of the image:
-0.056 8.877 (delta_t = 8.933 [sec])
Background time interval of the image:
-239.224 -0.056 (delta_t = 239.168 [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 -0.056 sec. to 56.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38152 ( -0.268481 0.269568 )
Norm@50keV : 1.22753E-03 ( -0.000168682 0.000168222 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.01 using 59 PHA bins.
# Reduced chi-squared = 1.334 for 57 degrees of freedom
# Null hypothesis probability = 4.696119e-02
Photon flux (15-150 keV) in 56.38 sec: 0.148875 ( -0.0211924 0.0212706 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.71317e-07 ( -1.02955e-07 1.04052e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.056 sec. to 56.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.31962 ( -0.889079 0.372848 )
Epeak [keV] : 353.802 ( -58.1538 -354.485 )
Norm@50keV : 1.49995E-04 ( -0.000149175 0.000458145 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.02 using 59 PHA bins.
# Reduced chi-squared = 1.322 for 56 degrees of freedom
# Null hypothesis probability = 5.369420e-02
Photon flux (15-150 keV) in 56.38 sec: 0.149381 ( -0.021849 0.020766 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.71869e-07 ( -1.0308e-07 1.00418e-07 ) ergs/cm2
Band function
Time interval is from -0.056 sec. to 56.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11236 ( 1.11265 6.11261 )
beta : -1.38139 ( 1.38147 0.268383 )
Epeak [keV] : 37.3520 ( -37.1963 -37.1963 )
Norm@50keV : 2.39566E-03 ( -0.001335 4.07388 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.01 using 59 PHA bins.
# Reduced chi-squared = 1.382 for 55 degrees of freedom
# Null hypothesis probability = 3.177547e-02
Photon flux (15-150 keV) in 56.38 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] : 19.5581 (-3.601 4.5944)
R^2/D10^2 : 6.77152E-03 (-0.00337549 0.00659099)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 94.33 using 59 PHA bins.
# Reduced chi-squared = 1.655 for 57 degrees of freedom
# Null hypothesis probability = 1.371251e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.840e-08 8.240e-09
25- 50 1.394e-07 3.515e-08
50-150 3.938e-07 1.160e-07
15-150 5.616e-07 1.243e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-61.3526 -200)
Norm : 0.613041 (-0.0843658 0.0843658)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.85 using 59 PHA bins.
# Reduced chi-squared = 1.383 for 57 degrees of freedom
# Null hypothesis probability = 2.923078e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.608e-08 4.916e-08
25- 50 1.656e-07 9.269e-08
50-150 3.631e-07 2.016e-07
15-150 6.148e-07 3.374e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.97663 (-1.77668 2.60378)
R1^2/D10^2 : 1.64884 (-1.45299 52.5232)
kT2 [keV] : 25.8548 (-5.82522 10.9792)
R2^2/D10^2 : 2.50383E-03 (-0.00167623 0.00333065)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.29 using 59 PHA bins.
# Reduced chi-squared = 1.333 for 55 degrees of freedom
# Null hypothesis probability = 5.017015e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.828e-08 5.052e-08
25- 50 1.221e-07 4.403e-08
50-150 4.582e-07 2.176e-07
15-150 6.785e-07 2.327e-07
Peak spectrum fit
Power-law model
Time interval is from -0.076 sec. to 0.924 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.971356 ( -0.178014 0.173489 )
Norm@50keV : 1.86392E-02 ( -0.0018515 0.00184504 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.33 using 59 PHA bins.
# Reduced chi-squared = 0.8129 for 57 degrees of freedom
# Null hypothesis probability = 8.427091e-01
Photon flux (15-150 keV) in 1 sec: 2.14303 ( -0.215328 0.215932 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03635e-07 ( -2.19114e-08 2.20478e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.076 sec. to 0.924 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.965366 ( -0.613679 0.253829 )
Epeak [keV] : 9998.00 ( -9997.93 -9997.93 )
Norm@50keV : 1.87551E-02 ( -0.00183372 0.0186771 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.33 using 59 PHA bins.
# Reduced chi-squared = 0.8273 for 56 degrees of freedom
# Null hypothesis probability = 8.181174e-01
Photon flux (15-150 keV) in 1 sec: 2.14105 ( -0.22042 0.21695 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03247e-07 ( -2.266e-08 2.2438e-08 ) ergs/cm2
Band function
Time interval is from -0.076 sec. to 0.924 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.91790 ( -4.9179 -4.9179 )
beta : -1.10076 ( -0.242994 0.21108 )
Epeak [keV] : 32.4011 ( -12.0352 6.20906 )
Norm@50keV : 253.274 ( -24.5951 2.25464e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.64 using 59 PHA bins.
# Reduced chi-squared = 0.7934 for 55 degrees of freedom
# Null hypothesis probability = 8.652020e-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] : 23.0259 (-3.17554 3.89413)
R^2/D10^2 : 6.64616E-02 (-0.025151 0.0388409)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.03 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 57 degrees of freedom
# Null hypothesis probability = 1.504635e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.383e-09 1.356e-09
25- 50 3.465e-08 6.075e-09
50-150 1.372e-07 2.285e-08
15-150 1.782e-07 2.580e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-19.4544 -200)
Norm : 8.62336 (-0.888735 0.888735)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.70 using 59 PHA bins.
# Reduced chi-squared = 1.328 for 57 degrees of freedom
# Null hypothesis probability = 4.940081e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.148e-08 1.188e-08
25- 50 4.131e-08 2.260e-08
50-150 9.061e-08 4.946e-08
15-150 1.534e-07 8.390e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.160697 (0.822496 -0.160697)
R1^2/D10^2 : 1.87761E+16 (-1.87761e+16 -1.87761e+16)
kT2 [keV] : 23.0379 (-3.1795 3.8901)
R2^2/D10^2 : 6.63585E-02 (-0.0251435 0.0388488)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.03 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 55 degrees of freedom
# Null hypothesis probability = 1.115716e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Mon Jun 18 22:08:39 EDT 2018