batgrbproduct analysis for trigger=868427
batgrbproduct Analysis for Trigger=868427
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): Wed Oct 24 02:22:21 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger868427/GCN5_download_cron
======================================================================
Trigger: 00868427 Segment: 000
BAT Trigger Time: 561953064 [s; MET]
Trigger Stop: 561953160 [s; MET]
UTC: 2018-10-23T02:04:02.201780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 248.328741900568 Dec: 19.564150818638 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.13
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.13
Flight Position: [ source = BAT ]
RA: 248.328741900568 Dec: 19.564150818638 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 248.322482056697 Dec: 19.5808761761094 [deg; J2000]
{ 16h 33m 17.4s , +19d 34' 51.2" }
+/- 2.03273914026956 [arcmin] (estimated 90% radius based on SNR)
+/- 1.04308943889578 [arcmin] (formal 1-sigma fit error)
SNR: 11.0408303769085
Angular difference between Flight and Ground position is 1.064092 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 57.9639999866486 +/- 8.80705991925374
Measured from: -22.4159998893738
to: 35.5480000972748 [s; relative to TRIGTIME]
T50: 35.6159999370575 +/- 8.14841952695596
Measured from: -7.61999988555908
to: 27.9960000514984 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 32.1840000152588
to: 33.1840000152588 [s; relative to TRIGTIME]
Total Fluence
Measured from: -27.6200000047684
to: 36.6840000152588 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.690249 0.755642 0.580920 0.116829
0.104103 0.089877 0.075663 0.067159 [error]
Peak 0.044157 0.032890 0.030239 0.010674
0.012811 0.011149 0.009474 0.008277 [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 2.23e-07 3.53e-07 4.22e-07 9.84e-07 1.28e-06 1.98e-06 erg/cm2
Error 4.93e-08 4.72e-08 7.66e-08 3.86e-07 1.81e-07 4.45e-07 erg/cm2
Peak flux Power-law 4.34e-01 3.40e-01 1.79e-01 1.37e-01 1.02e+00 1.09e+00 ph/cm2/s
Error 2.11e-01 1.03e-01 8.14e-02 1.30e-01 3.12e-01 3.22e-01 ph/cm2/s
Fluence Cutoff-PL 2.19e-07 3.57e-07 4.25e-07 8.24e-07 1.27e-06 1.83e-06 erg/cm2
Error 5.56e-08 5.35e-08 7.99e-08 6.14e-07 1.94e-07 6.19e-07 erg/cm2
Peak flux Cutoff-PL 4.43e-01 3.40e-01 1.77e-01 1.30e-01 1.02e+00 1.09e+00 ph/cm2/s
Error 2.15e-01 1.02e-01 8.23e-02 1.19e-01 3.12e-01 3.31e-01 ph/cm2/s
Fluence Band 2.16e-07 3.56e-07 4.24e-07 8.32e-07 1.27e-06 1.84e-06 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 1.742 0.240 - - 2.16e-03 2.93e-04 71.330 57
CPL 1.630 0.886 163.0 -24.5 2.46e-03 2.83e-03 71.270 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.924 0.613 - - 7.01e-03 2.42e-03 48.190 57
CPL 1.912 1.614 283.7 0.0 7.14e-03 0.00e+00 48.200 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: 16.128000 sec.
T50 in the 50-300 keV band: 9.344000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.304 -27.620 36.684
T90 57.964 -22.416 35.548
T50 35.616 -7.620 27.996
Peak 1.000 32.184 33.184
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
248.3225 +19.5809 0.0173 40.1 -25.6 1.9937 11.0 TRIG_00868427
------------------------------------------
Foreground time interval of the image:
-16.499 36.684 (delta_t = 53.183 [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 -27.620 sec. to 36.684 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74163 ( -0.237754 0.24279 )
Norm@50keV : 2.16036E-03 ( -0.00029532 0.000291469 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.33 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 57 degrees of freedom
# Null hypothesis probability = 9.600596e-02
Photon flux (15-150 keV) in 64.3 sec: 0.291221 ( -0.0394147 0.039626 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28242e-06 ( -1.79683e-07 1.81632e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -27.620 sec. to 36.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62966 ( -0.959319 0.81321 )
Epeak [keV] : 163.047 ( -114.138 -163.047 )
Norm@50keV : 2.46419E-03 ( -0.000788542 0.00487696 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.27 using 59 PHA bins.
# Reduced chi-squared = 1.273 for 56 degrees of freedom
# Null hypothesis probability = 8.205954e-02
Photon flux (15-150 keV) in 64.3 sec: 0.289355 ( -0.041717 0.040949 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27189e-06 ( -1.98378e-07 1.89762e-07 ) ergs/cm2
Band function
Time interval is from -27.620 sec. to 36.684 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.58484 ( -5.18926 0.793466 )
beta : -9.27956 ( 9.35781 19.3578 )
Epeak [keV] : 138.025 ( -137.906 -137.906 )
Norm@50keV : 2.58037E-03 ( -0.000704035 0.00321854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.28 using 59 PHA bins.
# Reduced chi-squared = 1.296 for 55 degrees of freedom
# Null hypothesis probability = 6.896787e-02
Photon flux (15-150 keV) in 64.3 sec: 0.289839 ( 6.71016 -0.041624 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27064e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.1456 (-2.30701 2.73238)
R^2/D10^2 : 3.70591E-02 (-0.0175099 0.0341903)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.00 using 59 PHA bins.
# Reduced chi-squared = 1.561 for 57 degrees of freedom
# Null hypothesis probability = 4.274086e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.006e-07 2.630e-08
25- 50 3.781e-07 7.992e-08
50-150 5.008e-07 1.401e-07
15-150 9.794e-07 1.755e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 150.344 (-64.6262 -138.866)
Norm : 1.13766 (-0.176718 0.279584)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.05 using 59 PHA bins.
# Reduced chi-squared = 1.264 for 57 degrees of freedom
# Null hypothesis probability = 8.651479e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.878e-07 1.054e-07
25- 50 3.483e-07 1.872e-07
50-150 6.881e-07 4.012e-07
15-150 1.224e-06 7.005e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.10177 (-1.34543 1.90949)
R1^2/D10^2 : 1.16345 (-0.838605 3.39096)
kT2 [keV] : 21.3401 (-4.6822 8.57055)
R2^2/D10^2 : 6.97343E-03 (-0.00491001 0.00782753)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.27 using 59 PHA bins.
# Reduced chi-squared = 1.259 for 55 degrees of freedom
# Null hypothesis probability = 9.336650e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.354e-07 1.323e-07
25- 50 3.341e-07 1.577e-07
50-150 6.819e-07 3.825e-07
15-150 1.251e-06 5.412e-07
Peak spectrum fit
Power-law model
Time interval is from 32.184 sec. to 33.184 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92420 ( -0.57913 0.645874 )
Norm@50keV : 7.00691E-03 ( -0.00251511 0.00233132 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.19 using 59 PHA bins.
# Reduced chi-squared = 0.8455 for 57 degrees of freedom
# Null hypothesis probability = 7.905296e-01
Photon flux (15-150 keV) in 1 sec: 1.01605 ( -0.310383 0.312834 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.44409e-08 ( -2.12126e-08 2.19263e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 32.184 sec. to 33.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91194 ( -2.01222 1.21667 )
Epeak [keV] : 283.677 ( )
Norm@50keV : 7.13971E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.20 using 59 PHA bins.
# Reduced chi-squared = 0.8607 for 56 degrees of freedom
# Null hypothesis probability = 7.613319e-01
Photon flux (15-150 keV) in 1 sec: 1.01859 ( -0.314716 0.3095 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.40255e-08 ( -2.09978e-08 2.20561e-08 ) ergs/cm2
Band function
Time interval is from 32.184 sec. to 33.184 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46224 ( 1.45898 1.45898 )
beta : -1.93787 ( 1.9374 0.591027 )
Epeak [keV] : 27.5438 ( -27.3649 -27.3649 )
Norm@50keV : 1.58767E-02 ( -0.0160874 2.35425e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.19 using 59 PHA bins.
# Reduced chi-squared = 0.8761 for 55 degrees of freedom
# Null hypothesis probability = 7.305115e-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] : 12.2652 (-5.76545 7.7675)
R^2/D10^2 : 0.204564 (-0.197828 2.10071)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.57 using 59 PHA bins.
# Reduced chi-squared = 0.9398 for 57 degrees of freedom
# Null hypothesis probability = 6.045186e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.519e-09 4.129e-09
25- 50 2.104e-08 1.280e-08
50-150 1.931e-08 1.382e-08
15-150 4.687e-08 2.971e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 90.2991 (-56.8627 -90.3201)
Norm : 4.48927 (-1.68362 3.35447)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.74 using 59 PHA bins.
# Reduced chi-squared = 0.8551 for 57 degrees of freedom
# Null hypothesis probability = 7.737306e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.171e-08 7.320e-09
25- 50 1.983e-08 1.192e-08
50-150 3.026e-08 2.472e-08
15-150 6.180e-08 4.208e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.86155 (-2.20346 3.63933)
R1^2/D10^2 : 6.12982 (-5.50215 111.134)
kT2 [keV] : 22.6830 (-9.93723 77.8046)
R2^2/D10^2 : 1.72843E-02 (-0.0169921 0.130713)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.33 using 59 PHA bins.
# Reduced chi-squared = 0.8605 for 55 degrees of freedom
# Null hypothesis probability = 7.593982e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.493e-08 9.170e-09
25- 50 1.684e-08 8.805e-09
50-150 3.386e-08 2.251e-08
15-150 6.563e-08 3.456e-08
Plot creation:
Wed Oct 24 02:27:19 EDT 2018