batgrbproduct analysis for trigger=811561
batgrbproduct Analysis for Trigger=811561
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): Sun Feb 25 18:46:20 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger811561/GCN5_download_cron
======================================================================
Trigger: 00811561 Segment: 000
BAT Trigger Time: 541203688.256 [s; MET]
Trigger Stop: 541203689.28 [s; MET]
UTC: 2018-02-24T22:21:07.725300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 202.661007449936 Dec: 38.088104423003 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.08
Image Trigger?: NO
Rate S/N Ratio: 16.3095064303001 [ if not an image trigger ]
Image S/N Ratio: 10.08
Flight Position: [ source = BAT ]
RA: 202.661007449936 Dec: 38.088104423003 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 202.674566051699 Dec: 38.0730581131661 [deg; J2000]
{ 13h 30m 41.9s , +38d 04' 23.0" }
+/- 1.2807887471382 [arcmin] (estimated 90% radius based on SNR)
+/- 0.458723078119252 [arcmin] (formal 1-sigma fit error)
SNR: 21.3589101891224
Angular difference between Flight and Ground position is 1.106826 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 10.9160000085831 +/- 3.56897359184709
Measured from: 0.144000053405762
to: 11.0600000619888 [s; relative to TRIGTIME]
T50: 4.57999992370605 +/- 0.764010445403551
Measured from: 1.3600001335144
to: 5.94000005722046 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.395999908447266
to: 1.39599990844727 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.476000070571899
to: 14.5719999074936 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.363201 0.390844 0.145293 0.055806
0.025557 0.026781 0.023876 0.023387 [error]
Peak 0.064973 0.067324 0.036436 0.010804
0.007326 0.007608 0.006628 0.006063 [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 1.14e-07 1.45e-07 1.35e-07 2.20e-07 4.67e-07 6.13e-07 erg/cm2
Error 1.36e-08 1.27e-08 2.22e-08 7.10e-08 4.98e-08 9.63e-08 erg/cm2
Peak flux Power-law 6.04e-01 4.81e-01 2.58e-01 2.02e-01 1.43e+00 1.54e+00 ph/cm2/s
Error 1.08e-01 5.99e-02 5.40e-02 8.06e-02 1.78e-01 1.98e-01 ph/cm2/s
Fluence Cutoff-PL 1.09e-07 1.55e-07 1.26e-07 7.12e-08 4.33e-07 4.60e-07 erg/cm2
Error 1.51e-08 1.78e-08 2.79e-08 1.20e-07 6.22e-08 1.21e-07 erg/cm2
Peak flux Cutoff-PL 5.79e-01 5.12e-01 2.53e-01 9.42e-02 1.41e+00 1.44e+00 ph/cm2/s
Error 1.18e-01 8.23e-02 6.14e-02 1.08e-01 1.82e-01 2.34e-01 ph/cm2/s
Fluence Band 1.06e-07 1.57e-07 1.21e-07 1.31e-07 4.38e-07 5.16e-07 erg/cm2
Error 1.52e-08 -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 5.71e-01 5.26e-01 2.43e-01 1.55e-01 1.42e+00 1.50e+00 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 2.105 0.175 - - 3.34e-03 3.94e-04 37.800 57
CPL 1.492 0.732 32.3 0.0 7.78e-03 0.00e+00 35.930 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.899 0.234 - - 1.00e-02 1.58e-03 48.730 57
CPL 1.377 0.934 48.7 0.0 2.03e-02 0.00e+00 47.820 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: 3.840000 sec.
T50 in the 50-300 keV band: 1.728000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 15.048 -0.476 14.572
T90 10.916 0.144 11.060
T50 4.580 1.360 5.940
Peak 1.000 0.396 1.396
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
202.6746 +38.0731 0.0090 19.4 -34.6 0.9243 21.4 TRIG_00811561
------------------------------------------
Foreground time interval of the image:
-0.476 9.045 (delta_t = 9.521 [sec])
Background time interval of the image:
-239.256 -166.036 (delta_t = 73.220 [sec])
-165.256 -0.476 (delta_t = 164.780 [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 -0.476 sec. to 14.572 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.10516 ( -0.170731 0.179838 )
Norm@50keV : 3.33987E-03 ( -0.000397751 0.000390533 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.80 using 59 PHA bins.
# Reduced chi-squared = 0.6632 for 57 degrees of freedom
# Null hypothesis probability = 9.765620e-01
Photon flux (15-150 keV) in 15.05 sec: 0.526788 ( -0.0447867 0.0447922 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.67251e-07 ( -4.91983e-08 5.04768e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.476 sec. to 14.572 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49181 ( -0.957467 0.507295 )
Epeak [keV] : 32.3202 ( )
Norm@50keV : 7.78156E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.93 using 59 PHA bins.
# Reduced chi-squared = 0.6416 for 56 degrees of freedom
# Null hypothesis probability = 9.830557e-01
Photon flux (15-150 keV) in 15.05 sec: 0.512014 ( -0.048103 0.048155 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.32964e-07 ( -5.95107e-08 6.48881e-08 ) ergs/cm2
Band function
Time interval is from -0.476 sec. to 14.572 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49247 ( -3.42716 0.236775 )
beta : -10.00000 ( 10 3.55271e-15 )
Epeak [keV] : 32.3095 ( -8.50132 17.7698 )
Norm@50keV : 7.77284E-03 ( -0.000658304 0.0219675 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.93 using 59 PHA bins.
# Reduced chi-squared = 0.6533 for 55 degrees of freedom
# Null hypothesis probability = 9.782632e-01
Photon flux (15-150 keV) in 15.05 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.38388e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.94735 (-0.831564 0.924804)
R^2/D10^2 : 0.367660 (-0.118006 0.172722)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.54 using 59 PHA bins.
# Reduced chi-squared = 0.9392 for 57 degrees of freedom
# Null hypothesis probability = 6.057865e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.598e-08 1.245e-08
25- 50 1.811e-07 1.949e-08
50-150 6.785e-08 1.723e-08
15-150 3.349e-07 3.567e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 53.1100 (-12.0091 18.2329)
Norm : 2.87324 (-0.408626 0.518621)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.02 using 59 PHA bins.
# Reduced chi-squared = 0.6319 for 57 degrees of freedom
# Null hypothesis probability = 9.865176e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.071e-07 1.309e-08
25- 50 1.571e-07 1.452e-08
50-150 1.613e-07 3.981e-08
15-150 4.255e-07 5.230e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.21039 (-3.20888 1.65008)
R1^2/D10^2 : 1.13003 (-0.498543 8.4415)
kT2 [keV] : 19.1187 (-10.3409 34.9841)
R2^2/D10^2 : 1.09193E-02 (-0.00647599 0.0661461)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.83 using 59 PHA bins.
# Reduced chi-squared = 0.6878 for 55 degrees of freedom
# Null hypothesis probability = 9.626190e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.032e-07 4.792e-08
25- 50 1.551e-07 6.180e-08
50-150 1.634e-07 8.938e-08
15-150 4.217e-07 1.733e-07
Peak spectrum fit
Power-law model
Time interval is from 0.396 sec. to 1.396 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89880 ( -0.227436 0.241371 )
Norm@50keV : 9.99861E-03 ( -0.00159958 0.00155719 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.73 using 59 PHA bins.
# Reduced chi-squared = 0.8550 for 57 degrees of freedom
# Null hypothesis probability = 7.739822e-01
Photon flux (15-150 keV) in 1 sec: 1.43417 ( -0.178293 0.178295 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.19229e-08 ( -1.416e-08 1.4593e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.396 sec. to 1.396 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37669 ( -1.15883 0.70943 )
Epeak [keV] : 48.7259 ( )
Norm@50keV : 2.02885E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.82 using 59 PHA bins.
# Reduced chi-squared = 0.8539 for 56 degrees of freedom
# Null hypothesis probability = 7.734487e-01
Photon flux (15-150 keV) in 1 sec: 1.40664 ( -0.18016 0.18416 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.63832e-08 ( -1.62261e-08 1.73488e-08 ) ergs/cm2
Band function
Time interval is from 0.396 sec. to 1.396 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.846027 ( -0.821629 -0.821629 )
beta : -2.14089 ( -5.44049 0.384497 )
Epeak [keV] : 29.1823 ( -29.1399 207.012 )
Norm@50keV : 0.861160 ( -0.749533 651.561 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.14 using 59 PHA bins.
# Reduced chi-squared = 0.8571 for 55 degrees of freedom
# Null hypothesis probability = 7.654187e-01
Photon flux (15-150 keV) in 1 sec: 1.41558 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.83252e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.81837 (-1.41847 1.69122)
R^2/D10^2 : 0.722211 (-0.326351 0.58354)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.58 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 57 degrees of freedom
# Null hypothesis probability = 3.820289e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.409e-08 3.094e-09
25- 50 3.412e-08 5.985e-09
50-150 1.688e-08 5.769e-09
15-150 6.509e-08 1.103e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 75.4479 (-25.8291 52.2654)
Norm : 6.88581 (-1.20381 1.51973)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.82 using 59 PHA bins.
# Reduced chi-squared = 0.8389 for 57 degrees of freedom
# Null hypothesis probability = 8.017763e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.779e-08 3.065e-09
25- 50 2.887e-08 4.670e-09
50-150 3.914e-08 2.034e-08
15-150 8.580e-08 2.324e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.13848 (-2.00363 2.15956)
R1^2/D10^2 : 3.01233 (-1.88101 8.83612)
kT2 [keV] : 20.6243 (-7.42009 25.8158)
R2^2/D10^2 : 2.87130E-02 (-0.0265022 0.143868)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.17 using 59 PHA bins.
# Reduced chi-squared = 0.8577 for 55 degrees of freedom
# Null hypothesis probability = 7.644036e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.790e-08 1.035e-08
25- 50 2.813e-08 1.487e-08
50-150 3.904e-08 2.307e-08
15-150 8.507e-08 4.528e-08
Plot creation:
Sun Feb 25 18:51:30 EST 2018