batgrbproduct analysis for trigger=852553
batgrbproduct Analysis for Trigger=852553
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 Aug 10 09:12:32 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger852553/batgroup_hand_proc
======================================================================
Trigger: 00852553 Segment: 000
BAT Trigger Time: 555539349.504 [s; MET]
Trigger Stop: 555539350.528 [s; MET]
UTC: 2018-08-09T20:28:48.102240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.71241182161 Dec: -15.3020410499128 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.89
Image Trigger?: NO
Rate S/N Ratio: 69.8140387028282 [ if not an image trigger ]
Image S/N Ratio: 20.89
Flight Position: [ source = BAT ]
RA: 299.71241182161 Dec: -15.3020410499128 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 299.711804743507 Dec: -15.2927685976229 [deg; J2000]
{ 19h 58m 50.8s , -15d 17' 34.0" }
+/- 0.56225299484388 [arcmin] (estimated 90% radius based on SNR)
+/- 0.133240301652705 [arcmin] (formal 1-sigma fit error)
SNR: 69.2402612765424
Angular difference between Flight and Ground position is 0.557455 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 233.243999958038 +/- 1.12445540263143
Measured from: 3.62800002098083
to: 236.871999979019 [s; relative to TRIGTIME]
T50: 37.595999956131 +/- 1.16756849842931
Measured from: 20.1759999990463
to: 57.7719999551773 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 35.0960000753403
to: 36.0960000753403 [s; relative to TRIGTIME]
Total Fluence
Measured from: -36.0799999237061
to: 302.308000087738 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 23.428057 38.318789 35.257398 10.272070
0.157600 0.172922 0.161166 0.122978 [error]
Peak 0.594344 1.156054 1.204186 0.402962
0.016147 0.021153 0.022643 0.016796 [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 7.46e-06 1.59e-05 2.67e-05 1.02e-04 7.33e-05 1.52e-04 erg/cm2
Error 2.09e-07 2.70e-07 2.96e-07 2.60e-06 8.10e-07 2.60e-06 erg/cm2
Peak flux Power-law 5.97e+00 7.98e+00 7.83e+00 1.38e+01 2.63e+01 3.56e+01 ph/cm2/s
Error 2.90e-01 2.32e-01 1.91e-01 7.47e-01 6.16e-01 8.71e-01 ph/cm2/s
Fluence Cutoff-PL 7.03e-06 1.59e-05 2.72e-05 8.79e-05 7.31e-05 1.38e-04 erg/cm2
Error 3.04e-07 2.76e-07 4.15e-07 6.96e-06 8.19e-07 6.94e-06 erg/cm2
Peak flux Cutoff-PL 5.57e+00 8.04e+00 8.06e+00 1.10e+01 2.60e+01 3.27e+01 ph/cm2/s
Error 3.85e-01 2.41e-01 2.45e-01 1.70e+00 6.46e-01 1.84e+00 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 1.257 0.021 - - 2.17e-02 2.76e-04 38.000 57
CPL 1.096 0.087 381.1 225.1 2.49e-02 1.80e-03 27.880 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.026 0.041 - - 2.28e-01 5.20e-03 44.250 57
CPL 0.789 0.165 304.8 288.7 2.88e-01 4.57e-02 37.900 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: 230.784000 sec.
T50 in the 50-300 keV band: 29.824000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 338.388 -36.080 302.308
T90 233.244 3.628 236.872
T50 37.596 20.176 57.772
Peak 1.000 35.096 36.096
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.7118 -15.2928 0.0028 21.6894 100.2788 17.4390250 69.240 TRIG_00852553
Foreground time interval of the image:
-36.080 12.197 (delta_t = 48.277 [sec])
Background time interval of the image:
-239.504 -36.080 (delta_t = 203.424 [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 -36.080 sec. to 302.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25663 ( -0.0208173 0.0207258 )
Norm@50keV : 2.16917E-02 ( -0.000275932 0.000275294 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.00 using 59 PHA bins.
# Reduced chi-squared = 0.6667 for 57 degrees of freedom
# Null hypothesis probability = 9.751678e-01
Photon flux (15-150 keV) in 338.4 sec: 2.56833 ( -0.0377605 0.0378864 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.33353e-05 ( -8.09866e-07 8.09825e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -36.080 sec. to 302.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09561 ( -0.0880442 0.0865068 )
Epeak [keV] : 381.147 ( -108.882 341.352 )
Norm@50keV : 2.48598E-02 ( -0.00172664 0.00187822 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 27.88 using 59 PHA bins.
# Reduced chi-squared = 0.4978 for 56 degrees of freedom
# Null hypothesis probability = 9.994047e-01
Photon flux (15-150 keV) in 338.4 sec: 2.53057 ( -0.04202 0.04229 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.31384e-05 ( -8.19266e-07 8.18928e-07 ) ergs/cm2
Band function
Time interval is from -36.080 sec. to 302.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09561 ( -0.0377449 0.0242229 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 381.095 ( -43.8882 341.308 )
Norm@50keV : 2.48571E-02 ( -0.000273449 0.00187706 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 27.88 using 59 PHA bins.
# Reduced chi-squared = 0.5069 for 55 degrees of freedom
# Null hypothesis probability = 9.991403e-01
Photon flux (15-150 keV) in 338.4 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] : 24.1527 ( )
R^2/D10^2 : 6.12471E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1395.03 using 59 PHA bins.
# Reduced chi-squared = 24.4742 for 57 degrees of freedom
# Null hypothesis probability = 3.389708e-254
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.138e-06 5.516e-08
25- 50 1.192e-05 2.200e-07
50-150 5.176e-05 6.430e-07
15-150 6.581e-05 7.445e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 11.7810 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 979.19 using 59 PHA bins.
# Reduced chi-squared = 17.179 for 57 degrees of freedom
# Null hypothesis probability = 4.065964e-168
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.927e-06 1.303e-07
25- 50 1.910e-05 2.656e-07
50-150 4.188e-05 5.753e-07
15-150 7.090e-05 9.644e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.93295 (-0.445348 0.466032)
R1^2/D10^2 : 0.964059 (-0.150375 0.184183)
kT2 [keV] : 35.3049 (-1.34128 1.52952)
R2^2/D10^2 : 1.47772E-02 (-0.00200307 0.00213379)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.52 using 59 PHA bins.
# Reduced chi-squared = 0.6094 for 55 degrees of freedom
# Null hypothesis probability = 9.901924e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.926e-06 3.046e-07
25- 50 1.636e-05 3.773e-07
50-150 5.065e-05 7.783e-07
15-150 7.294e-05 1.015e-06
Peak spectrum fit
Power-law model
Time interval is from 35.096 sec. to 36.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02587 ( -0.040914 0.0407828 )
Norm@50keV : 0.228060 ( -0.0051982 0.00519373 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.25 using 59 PHA bins.
# Reduced chi-squared = 0.7763 for 57 degrees of freedom
# Null hypothesis probability = 8.912972e-01
Photon flux (15-150 keV) in 1 sec: 26.2958 ( -0.615387 0.616291 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.4439e-06 ( -5.95174e-08 5.95957e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 35.096 sec. to 36.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.788634 ( -0.167783 0.161776 )
Epeak [keV] : 304.772 ( -100.718 476.609 )
Norm@50keV : 0.287962 ( -0.0413892 0.050081 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.90 using 59 PHA bins.
# Reduced chi-squared = 0.6767 for 56 degrees of freedom
# Null hypothesis probability = 9.696236e-01
Photon flux (15-150 keV) in 1 sec: 25.9906 ( -0.6457 0.6466 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.42195e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 35.096 sec. to 36.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99996 ( -0.000120193 -4.99996 )
beta : -1.06693 ( -0.0447516 0.0444881 )
Epeak [keV] : 29.2808 ( -5.44688 2.9359 )
Norm@50keV : 6120.81 ( -136.765 14419.1 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.68 using 59 PHA bins.
# Reduced chi-squared = 0.7034 for 55 degrees of freedom
# Null hypothesis probability = 9.533044e-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] : 22.3297 ( )
R^2/D10^2 : 0.891568 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 333.49 using 59 PHA bins.
# Reduced chi-squared = 5.8508 for 57 degrees of freedom
# Null hypothesis probability = 1.019009e-40
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.171e-08 3.835e-09
25- 50 4.358e-07 1.375e-08
50-150 1.624e-06 5.950e-08
15-150 2.142e-06 5.850e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 108.862 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 500.34 using 59 PHA bins.
# Reduced chi-squared = 8.7778 for 57 degrees of freedom
# Null hypothesis probability = 3.949837e-72
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.711e-07 6.700e-09
25- 50 5.215e-07 1.245e-08
50-150 1.144e-06 2.950e-08
15-150 1.936e-06 5.100e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.46852 (-0.974234 1.0606)
R1^2/D10^2 : 7.23998 (-1.83651 2.69032)
kT2 [keV] : 37.9786 (-3.76706 5.28898)
R2^2/D10^2 : 0.143352 (-0.0473566 0.0569875)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.52 using 59 PHA bins.
# Reduced chi-squared = 0.6457 for 55 degrees of freedom
# Null hypothesis probability = 9.808722e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.571e-07 1.320e-08
25- 50 4.832e-07 2.705e-08
50-150 1.796e-06 1.445e-07
15-150 2.436e-06 1.405e-07
Plot creation:
Fri Aug 10 09:32:11 EDT 2018