batgrbproduct analysis for trigger=885960
batgrbproduct Analysis for Trigger=885960
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 Jan 27 22:18:18 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger885960/GCN5_download_cron
======================================================================
Trigger: 00885960 Segment: 000
BAT Trigger Time: 570243392 [s; MET]
Trigger Stop: 570243528 [s; MET]
UTC: 2019-01-27T00:56:09.684040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 207.035377785321 Dec: -63.2676437463196 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 22.58
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 22.58
Flight Position: [ source = BAT ]
RA: 207.035377785321 Dec: -63.2676437463196 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 207.035912792034 Dec: -63.2743171542492 [deg; J2000]
{ 13h 48m 08.6s , -63d 16' 27.5" }
+/- 0.866526415671863 [arcmin] (estimated 90% radius based on SNR)
+/- 0.31874905495544 [arcmin] (formal 1-sigma fit error)
SNR: 37.3251458579297
Angular difference between Flight and Ground position is 0.400665 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 642.296000003815 +/- 41.7220492143045
Measured from: -37.8599998950958
to: 604.436000108719 [s; relative to TRIGTIME]
T50: 306.952000021935 +/- 22.937627225149
Measured from: 53.2800000905991
to: 360.232000112534 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 41.1480000019073
to: 42.1480000019073 [s; relative to TRIGTIME]
Total Fluence
Measured from: -60.1080000400543
to: 671.807999968529 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 11.543400 14.540268 9.052720 1.498993
0.207716 0.201500 0.166482 0.137572 [error]
Peak 0.046905 0.044408 0.022110 0.003992
0.007854 0.007495 0.006166 0.004970 [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 3.64e-06 5.73e-06 6.79e-06 1.56e-05 2.07e-05 3.18e-05 erg/cm2
Error 1.54e-07 1.37e-07 1.82e-07 9.64e-07 4.42e-07 1.06e-06 erg/cm2
Peak flux Power-law 3.75e-01 3.18e-01 1.84e-01 1.58e-01 9.45e-01 1.03e+00 ph/cm2/s
Error 1.02e-01 5.69e-02 4.99e-02 8.48e-02 1.69e-01 1.87e-01 ph/cm2/s
Fluence Cutoff-PL 3.29e-06 5.85e-06 6.96e-06 9.19e-06 2.00e-05 2.53e-05 erg/cm2
Error 2.02e-07 1.49e-07 2.00e-07 1.92e-06 5.24e-07 2.00e-06 erg/cm2
Peak flux Cutoff-PL 3.69e-01 3.24e-01 1.84e-01 1.24e-01 9.40e-01 1.00e+00 ph/cm2/s
Error 1.09e-01 6.86e-02 5.21e-02 1.27e-01 1.73e-01 2.22e-01 ph/cm2/s
Fluence Band 3.18e-06 5.89e-06 6.84e-06 1.25e-05 2.00e-05 2.85e-05 erg/cm2
Error 2.56e-07 1.87e-07 -------- -------- 5.15e-07 -------- erg/cm2
Peak flux Band 3.73e-01 3.33e-01 1.79e-01 1.41e-01 9.47e-01 1.02e+00 ph/cm2/s
Error -------- -------- -------- -------- 1.72e-01 1.92e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.754 0.041 - - 3.07e-03 6.43e-05 69.220 57
CPL 1.333 0.179 83.9 16.8 4.82e-03 9.16e-04 51.680 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.790 0.328 - - 6.89e-03 1.43e-03 45.220 57
CPL 1.629 1.116 99.9 0.0 8.50e-03 0.00e+00 45.170 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 731.916 -60.108 671.808
T90 642.296 -37.860 604.436
T50 306.952 53.280 360.232
Peak 1.000 41.148 42.148
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
207.0359 -63.2743 0.0052 10.4 -20.7 8.4608 37.3 TRIG_00885960
------------------------------------------
Foreground time interval of the image:
-13.599 144.201 (delta_t = 157.800 [sec])
Background time interval of the image:
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 -60.108 sec. to 671.808 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75367 ( -0.0412788 0.0413456 )
Norm@50keV : 3.06659E-03 ( -6.43544e-05 6.434e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.22 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 57 degrees of freedom
# Null hypothesis probability = 1.286311e-01
Photon flux (15-150 keV) in 731.9 sec: 0.415216 ( -0.010213 0.0102615 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0706e-05 ( -4.41756e-07 4.42043e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -60.108 sec. to 671.808 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33252 ( -0.182935 0.175822 )
Epeak [keV] : 83.9428 ( -10.8252 22.8206 )
Norm@50keV : 4.82081E-03 ( -0.00081131 0.00102112 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.68 using 59 PHA bins.
# Reduced chi-squared = 0.9229 for 56 degrees of freedom
# Null hypothesis probability = 6.388514e-01
Photon flux (15-150 keV) in 731.9 sec: 0.399360 ( -0.011825 0.011909 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.0017e-05 ( -5.24699e-07 5.22943e-07 ) ergs/cm2
Band function
Time interval is from -60.108 sec. to 671.808 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14989 ( -0.311314 1.14181 )
beta : -1.99362 ( 1.99364 0.160005 )
Epeak [keV] : 67.7846 ( -27.9128 30.2493 )
Norm@50keV : 6.11590E-03 ( -0.00190028 0.0285867 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.39 using 59 PHA bins.
# Reduced chi-squared = 0.9161 for 55 degrees of freedom
# Null hypothesis probability = 6.512864e-01
Photon flux (15-150 keV) in 731.9 sec: 0.396572 ( 6.60343 -0.013247 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99962e-05 ( -1.99911e-05 -5.14672e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.6322 ( )
R^2/D10^2 : 4.55536E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 435.90 using 59 PHA bins.
# Reduced chi-squared = 7.6474 for 57 degrees of freedom
# Null hypothesis probability = 8.910294e-60
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.500e-06 6.990e-08
25- 50 5.824e-06 1.691e-07
50-150 8.390e-06 3.184e-07
15-150 1.571e-05 3.477e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 131.590 (-13.676 12.3349)
Norm : 1.69122 (-0.0484457 0.062975)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.78 using 59 PHA bins.
# Reduced chi-squared = 0.9085 for 57 degrees of freedom
# Null hypothesis probability = 6.705137e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.166e-06 1.672e-07
25- 50 5.777e-06 2.342e-07
50-150 1.090e-05 2.225e-06
15-150 1.985e-05 2.441e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.37179 (-0.624882 0.657882)
R1^2/D10^2 : 0.366701 (-0.0913745 0.133623)
kT2 [keV] : 24.3852 (-1.96193 2.51144)
R2^2/D10^2 : 5.28391E-03 (-0.00168811 0.00211941)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.06 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 55 degrees of freedom
# Null hypothesis probability = 2.974435e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.869e-06 2.104e-07
25- 50 5.991e-06 2.452e-07
50-150 1.077e-05 6.953e-07
15-150 1.963e-05 8.893e-07
Peak spectrum fit
Power-law model
Time interval is from 41.148 sec. to 42.148 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79021 ( -0.319765 0.336937 )
Norm@50keV : 6.88516E-03 ( -0.00145075 0.00140235 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.22 using 59 PHA bins.
# Reduced chi-squared = 0.7934 for 57 degrees of freedom
# Null hypothesis probability = 8.699141e-01
Photon flux (15-150 keV) in 1 sec: 0.945184 ( -0.169344 0.169433 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.34086e-08 ( -1.33058e-08 1.37025e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 41.148 sec. to 42.148 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62870 ( -1.45602 0.775791 )
Epeak [keV] : 99.9276 ( )
Norm@50keV : 8.50378E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.17 using 59 PHA bins.
# Reduced chi-squared = 0.8065 for 56 degrees of freedom
# Null hypothesis probability = 8.495116e-01
Photon flux (15-150 keV) in 1 sec: 0.939563 ( -0.173902 0.172967 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.23248e-08 ( -1.53188e-08 1.46076e-08 ) ergs/cm2
Band function
Time interval is from 41.148 sec. to 42.148 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.76322 ( -4.76322 -4.76322 )
beta : -1.91273 ( -0.443325 0.372312 )
Epeak [keV] : 22.6918 ( -22.6918 6.42419 )
Norm@50keV : 1170.75 ( -207.645 7.46362e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.45 using 59 PHA bins.
# Reduced chi-squared = 0.8082 for 55 degrees of freedom
# Null hypothesis probability = 8.445911e-01
Photon flux (15-150 keV) in 1 sec: 0.947204 ( 6.0528 -0.171087 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.35888e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.6205 (-2.21052 3.03259)
R^2/D10^2 : 0.351848 (-0.214301 0.499107)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.22 using 59 PHA bins.
# Reduced chi-squared = 0.9337 for 57 degrees of freedom
# Null hypothesis probability = 6.175777e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.227e-09 2.717e-09
25- 50 2.222e-08 6.895e-09
50-150 1.377e-08 6.799e-09
15-150 4.422e-08 1.319e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9683 (-47.7879 -99.9771)
Norm : 4.17637 (-0.903642 1.35937)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.35 using 59 PHA bins.
# Reduced chi-squared = 0.7957 for 57 degrees of freedom
# Null hypothesis probability = 8.668861e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.092e-08 2.793e-09
25- 50 1.887e-08 7.830e-09
50-150 3.058e-08 2.230e-08
15-150 6.037e-08 2.393e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.80877 (-3.54895 3.55178)
R1^2/D10^2 : 2.23652 (-1.0011 11.0235)
kT2 [keV] : 21.0895 (-14.9153 -28.9541)
R2^2/D10^2 : 1.90038E-02 (-0.00641596 0.0562844)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.69 using 59 PHA bins.
# Reduced chi-squared = 0.8307 for 55 degrees of freedom
# Null hypothesis probability = 8.102704e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.115e-08 7.000e-09
25- 50 1.709e-08 9.625e-09
50-150 2.795e-08 1.679e-08
15-150 5.619e-08 3.205e-08
Plot creation:
Sun Jan 27 22:22:28 EST 2019