batgrbproduct analysis for trigger=855434
batgrbproduct Analysis for Trigger=855434
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 24 15:05:04 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger855434/batgroup_hand_proc
======================================================================
Trigger: 00855434 Segment: 000
BAT Trigger Time: 556743894.464 [s; MET]
Trigger Stop: 556743896.512 [s; MET]
UTC: 2018-08-23T19:04:32.988300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 210.349060652558 Dec: 14.8842385340093 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.89
Image Trigger?: NO
Rate S/N Ratio: 11.7473401244707 [ if not an image trigger ]
Image S/N Ratio: 8.89
Flight Position: [ source = BAT ]
RA: 210.349060652558 Dec: 14.8842385340093 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 210.358088177704 Dec: 14.90088367325 [deg; J2000]
{ 14h 01m 25.9s , +14d 54' 03.2" }
+/- 0.810258969368269 [arcmin] (estimated 90% radius based on SNR)
+/- 0.165745393539818 [arcmin] (formal 1-sigma fit error)
SNR: 41.0823937798566
Angular difference between Flight and Ground position is 1.127575 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 80.2960000038147 +/- 6.89302403001873
Measured from: -29.2680000066757
to: 51.027999997139 [s; relative to TRIGTIME]
T50: 30.8960000276566 +/- 1.70345995600386
Measured from: -8.86000001430511
to: 22.0360000133514 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 18.3320000171661
to: 19.3320000171661 [s; relative to TRIGTIME]
Total Fluence
Measured from: -37.5319999456406
to: 72.0479999780655 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.468370 4.914412 3.423441 0.853641
0.087758 0.095974 0.085352 0.081318 [error]
Peak 0.075860 0.104922 0.086222 0.030674
0.008910 0.009947 0.009027 0.007979 [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-06 2.01e-06 2.70e-06 7.42e-06 7.84e-06 1.33e-05 erg/cm2
Error 5.89e-08 5.89e-08 9.11e-08 5.74e-07 2.18e-07 6.25e-07 erg/cm2
Peak flux Power-law 7.01e-01 7.56e-01 5.80e-01 7.28e-01 2.31e+00 2.77e+00 ph/cm2/s
Error 1.21e-01 8.12e-02 7.44e-02 1.91e-01 2.33e-01 2.92e-01 ph/cm2/s
Fluence Cutoff-PL 1.08e-06 2.04e-06 2.74e-06 5.20e-06 7.68e-06 1.11e-05 erg/cm2
Error 7.53e-08 6.54e-08 9.81e-08 1.48e-06 2.55e-07 1.50e-06 erg/cm2
Peak flux Cutoff-PL 6.55e-01 7.89e-01 5.97e-01 4.39e-01 2.27e+00 2.48e+00 ph/cm2/s
Error 1.41e-01 7.50e-02 8.21e-02 3.30e-01 2.42e-01 4.26e-01 ph/cm2/s
Fluence Band 1.02e-06 2.08e-06 2.67e-06 6.70e-06 7.66e-06 1.25e-05 erg/cm2
Error 9.29e-08 7.60e-08 9.25e-08 8.64e-07 2.40e-07 -------- 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 1.576 0.051 - - 7.62e-03 2.00e-04 67.440 57
CPL 1.325 0.208 141.1 185.9 1.00e-02 2.26e-03 63.000 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 1.383 0.173 - - 1.91e-02 1.96e-03 50.580 57
CPL 0.968 0.661 121.7 0.0 3.12e-02 0.00e+00 49.480 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: 44.032000 sec.
T50 in the 50-300 keV band: 23.744000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 109.580 -37.532 72.048
T90 80.296 -29.268 51.028
T50 30.896 -8.860 22.036
Peak 1.000 18.332 19.332
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
210.3581 14.9009 0.0047 25.0407 -24.3273 10.2429220 41.082 TRIG_00855434
Foreground time interval of the image:
-37.532 28.837 (delta_t = 66.369 [sec])
Background time interval of the image:
-60.464 -37.532 (delta_t = 22.932 [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 -37.532 sec. to 72.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57552 ( -0.0506418 0.0507087 )
Norm@50keV : 7.62160E-03 ( -0.000199679 0.000199599 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.44 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 57 degrees of freedom
# Null hypothesis probability = 1.622060e-01
Photon flux (15-150 keV) in 109.6 sec: 0.972134 ( -0.0277969 0.0278776 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.83637e-06 ( -2.17697e-07 2.1814e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -37.532 sec. to 72.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32543 ( -0.213221 0.203208 )
Epeak [keV] : 141.076 ( -41.8047 330.06 )
Norm@50keV : 1.00254E-02 ( -0.00195518 0.00257318 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.00 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 56 degrees of freedom
# Null hypothesis probability = 2.425398e-01
Photon flux (15-150 keV) in 109.6 sec: 0.953373 ( -0.031298 0.03141 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.67531e-06 ( -2.55982e-07 2.54623e-07 ) ergs/cm2
Band function
Time interval is from -37.532 sec. to 72.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.593823 ( -0.774586 2.74044 )
beta : -1.67035 ( -0.104854 0.0837882 )
Epeak [keV] : 52.1507 ( -22.2263 118.116 )
Norm@50keV : 2.92823E-02 ( -0.0199495 3.55067 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.78 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.064120e-01
Photon flux (15-150 keV) in 109.6 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.66188e-06 ( -7.66112e-06 -2.39783e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.2382 ( )
R^2/D10^2 : 9.80391E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 334.37 using 59 PHA bins.
# Reduced chi-squared = 5.8661 for 57 degrees of freedom
# Null hypothesis probability = 7.066405e-41
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.210e-07 2.663e-08
25- 50 2.100e-06 7.617e-08
50-150 3.342e-06 1.617e-07
15-150 5.963e-06 1.726e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-27.7543 -200)
Norm : 3.90757 (-0.101609 0.101609)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.01 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.722298e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.067e-06 3.025e-08
25- 50 2.053e-06 5.809e-08
50-150 4.501e-06 1.288e-07
15-150 7.621e-06 2.208e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.83093 (-0.775339 0.818098)
R1^2/D10^2 : 0.690488 (-0.186444 0.284288)
kT2 [keV] : 28.3182 (-3.20974 4.51499)
R2^2/D10^2 : 8.48448E-03 (-0.00342603 0.00471466)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.25 using 59 PHA bins.
# Reduced chi-squared = 1.223 for 55 degrees of freedom
# Null hypothesis probability = 1.242720e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.464e-07 8.719e-08
25- 50 2.119e-06 1.266e-07
50-150 4.543e-06 4.362e-07
15-150 7.609e-06 5.502e-07
Peak spectrum fit
Power-law model
Time interval is from 18.332 sec. to 19.332 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38251 ( -0.173055 0.173647 )
Norm@50keV : 1.90590E-02 ( -0.00196035 0.00195085 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.58 using 59 PHA bins.
# Reduced chi-squared = 0.8875 for 57 degrees of freedom
# Null hypothesis probability = 7.128979e-01
Photon flux (15-150 keV) in 1 sec: 2.31198 ( -0.23323 0.233397 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.84832e-07 ( -2.13718e-08 2.16414e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 18.332 sec. to 19.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.967921 ( -0.779941 0.541339 )
Epeak [keV] : 121.705 ( )
Norm@50keV : 3.12299E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.48 using 59 PHA bins.
# Reduced chi-squared = 0.8836 for 56 degrees of freedom
# Null hypothesis probability = 7.183434e-01
Photon flux (15-150 keV) in 1 sec: 2.27286 ( -0.24236 0.24171 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.78126e-07 ( -2.423e-08 2.424e-08 ) ergs/cm2
Band function
Time interval is from 18.332 sec. to 19.332 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97108 ( -4.97108 -4.97108 )
beta : -1.46042 ( -0.20357 0.194169 )
Epeak [keV] : 24.5484 ( -24.5484 6.55293 )
Norm@50keV : 1961.09 ( -195.244 7.17816e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.88 using 59 PHA bins.
# Reduced chi-squared = 0.8888 for 55 degrees of freedom
# Null hypothesis probability = 7.060914e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79722e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.1918 (-1.8805 2.22126)
R^2/D10^2 : 0.256984 (-0.0966654 0.149312)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.61 using 59 PHA bins.
# Reduced chi-squared = 1.186 for 57 degrees of freedom
# Null hypothesis probability = 1.588133e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.239e-08 2.286e-09
25- 50 4.981e-08 6.760e-09
50-150 7.867e-08 1.666e-08
15-150 1.409e-07 1.865e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-47.5033 -200)
Norm : 9.44959 (-0.950565 0.950565)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.89 using 59 PHA bins.
# Reduced chi-squared = 0.9103 for 57 degrees of freedom
# Null hypothesis probability = 6.666741e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.364e-08 1.019e-08
25- 50 4.548e-08 2.050e-08
50-150 9.974e-08 5.135e-08
15-150 1.689e-07 9.130e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.64656 (-2.62541 3.28388)
R1^2/D10^2 : 1.64418 (-1.04512 4.80207)
kT2 [keV] : 27.6063 (-8.15399 36.4425)
R2^2/D10^2 : 2.58167E-02 (-0.0237013 0.068286)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.23 using 59 PHA bins.
# Reduced chi-squared = 0.8951 for 55 degrees of freedom
# Null hypothesis probability = 6.937109e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.001e-08 1.028e-08
25- 50 4.635e-08 2.194e-08
50-150 1.127e-07 6.054e-08
15-150 1.790e-07 8.438e-08
Plot creation:
Fri Aug 24 15:12:26 EDT 2018