batgrbproduct analysis for trigger=813449
batgrbproduct Analysis for Trigger=813449
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 10 17:40:33 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger813449/GCN5_download_cron
======================================================================
Trigger: 00813449 Segment: 000
BAT Trigger Time: 542312456 [s; MET]
Trigger Stop: 542312520 [s; MET]
UTC: 2018-03-09T18:20:35.402420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 255.432992532495 Dec: -40.8553448343492 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 21.99
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 21.99
Flight Position: [ source = BAT ]
RA: 255.432992532495 Dec: -40.8553448343492 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 255.421018053969 Dec: -40.8561288262543 [deg; J2000]
{ 17h 01m 41.0s , -40d 51' 22.1" }
+/- 1.32699146355964 [arcmin] (estimated 90% radius based on SNR)
+/- 0.546312088338679 [arcmin] (formal 1-sigma fit error)
SNR: 20.3045085028938
Angular difference between Flight and Ground position is 0.545452 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 71.3599998950958 +/- 7.83047587114546
Measured from: -0.97599983215332
to: 70.3840000629425 [s; relative to TRIGTIME]
T50: 32.6080000400543 +/- 3.78165946981155
Measured from: 21.7080000638962
to: 54.3160001039505 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 60.7760000228882
to: 61.7760000228882 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.50399994850159
to: 78.6679999828339 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.471229 0.359386 0.068842 -0.007725
0.071847 0.062627 0.053046 0.048532 [error]
Peak 0.052013 0.021458 0.014262 0.004104
0.007634 0.006843 0.005736 0.005297 [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 -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
Fluence Cutoff-PL -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Cutoff-PL -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- 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 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL -3.641 0.481 13.1 5.7 5.43e+03 3.07e+08 56.850 56
The chi2 of BB fit is 57.24 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL 1.974 0.475 1.1 10.4 1.09e-02 0.00e+00 75.770 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 86.172 -7.504 78.668
T90 71.360 -0.976 70.384
T50 32.608 21.708 54.316
Peak 1.000 60.776 61.776
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
255.4210 -40.8561 0.0095 6.6 111.9 3.6609 20.3 TRIG_00813449
------------------------------------------
Foreground time interval of the image:
-7.504 78.668 (delta_t = 86.172 [sec])
Background time interval of the image:
-82.699 -7.504 (delta_t = 75.195 [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 -7.504 sec. to 78.668 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 86.17 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.504 sec. to 78.668 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.64148 ( 2.4831 3.44444 )
Epeak [keV] : 13.0575 ( -7.04947 4.29674 )
Norm@50keV : 5433.91 ( -5487.51 6.13775e+08 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.85 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 56 degrees of freedom
# Null hypothesis probability = 4.430857e-01
Photon flux (15-150 keV) in 86.17 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -7.504 sec. to 78.668 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 86.17 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] : 2.82446 (-0.17661 0.195106)
R^2/D10^2 : 95.6920 (-37.417 60.8059)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.24 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.660686e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.050e-06 1.535e-07
25- 50 1.233e-07 2.365e-08
50-150 1.199e-10 7.456e-11
15-150 1.173e-06 1.792e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.20440 (-0.495284 0.579779)
Norm : 92.1524 (-30.7474 46.4996)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.37 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 57 degrees of freedom
# Null hypothesis probability = 3.550645e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.052e-06 1.572e-07
25- 50 1.454e-07 2.615e-08
50-150 9.193e-10 5.182e-10
15-150 1.199e-06 1.568e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.76597 (-0.190251 0.202582)
R1^2/D10^2 : 109.487 (-44.827 77.8911)
kT2 [keV] : 16.4669 (-11.9828 -16.0836)
R2^2/D10^2 : 1.50299E-03 (-0.00154213 0.0287714)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.51 using 59 PHA bins.
# Reduced chi-squared = 0.9912 for 55 degrees of freedom
# Null hypothesis probability = 4.931098e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.053e-06 2.010e-07
25- 50 1.449e-07 4.011e-08
50-150 5.965e-08 4.462e-08
15-150 1.258e-06 2.433e-07
Peak spectrum fit
Power-law model
Time interval is from 60.776 sec. to 61.776 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from 60.776 sec. to 61.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97431 ( -0.928089 0.0214026 )
Epeak [keV] : 1.08237 ( -0.735568 20.0808 )
Norm@50keV : 1.08506E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.77 using 59 PHA bins.
# Reduced chi-squared = 1.353 for 56 degrees of freedom
# Null hypothesis probability = 4.039867e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 60.776 sec. to 61.776 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
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] : 3.92561 (-1.02599 1.74905)
R^2/D10^2 : 19.5574 (-19.6745 88.4301)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.39 using 59 PHA bins.
# Reduced chi-squared = 1.445 for 57 degrees of freedom
# Null hypothesis probability = 1.554991e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.623e-08 9.160e-09
25- 50 5.552e-09 3.456e-09
50-150 6.019e-11 5.915e-11
15-150 2.184e-08 1.258e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.9994 (-11.2967 25.9759)
Norm : 9.01789 (-4.75791 21.9755)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.61 using 59 PHA bins.
# Reduced chi-squared = 1.362 for 57 degrees of freedom
# Null hypothesis probability = 3.612944e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.399e-08 5.156e-09
25- 50 1.225e-08 5.599e-09
50-150 3.668e-09 2.712e-09
15-150 2.990e-08 1.217e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.87052 (-0.857904 1.06464)
R1^2/D10^2 : 95.0858 (-78.9433 189.901)
kT2 [keV] : 15.6027 (-5.78144 11.6456)
R2^2/D10^2 : 3.84769E-02 (-0.0347964 0.184098)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.26 using 59 PHA bins.
# Reduced chi-squared = 1.259 for 55 degrees of freedom
# Null hypothesis probability = 9.351577e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.539e-08 8.475e-09
25- 50 9.692e-09 5.480e-09
50-150 1.351e-08 9.265e-09
15-150 3.859e-08 2.028e-08
Plot creation:
Sat Mar 10 17:44:08 EST 2018