batgrbproduct analysis for trigger=868984
batgrbproduct Analysis for Trigger=868984
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 Oct 28 05:12:19 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger868984/GCN5_download_cron
======================================================================
Trigger: 00868984 Segment: 000
BAT Trigger Time: 562297761.216 [s; MET]
Trigger Stop: 562297769.408 [s; MET]
UTC: 2018-10-27T01:48:59.396380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 225.382612995229 Dec: 30.8911164541395 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.88
Image Trigger?: NO
Rate S/N Ratio: 6.6332495807108 [ if not an image trigger ]
Image S/N Ratio: 7.88
Flight Position: [ source = BAT ]
RA: 225.382612995229 Dec: 30.8911164541395 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 225.361411389711 Dec: 30.9368258243746 [deg; J2000]
{ 15h 01m 26.7s , +30d 56' 12.6" }
+/- 1.09612159861271 [arcmin] (estimated 90% radius based on SNR)
+/- 0.438816628883003 [arcmin] (formal 1-sigma fit error)
SNR: 26.6794780790461
Angular difference between Flight and Ground position is 2.951739 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 81.1599998474121 +/- 10.5545420440407
Measured from: -7.98799979686737
to: 73.1720000505447 [s; relative to TRIGTIME]
T50: 39.9479999542236 +/- 7.79210376408396
Measured from: 17.1400001049042
to: 57.0880000591278 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 47.808000087738
to: 48.808000087738 [s; relative to TRIGTIME]
Total Fluence
Measured from: -18.4519999027252
to: 85.444000005722 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.153790 1.652067 1.285404 0.349214
0.075273 0.073874 0.063530 0.053692 [error]
Peak 0.043846 0.049103 0.045915 0.019573
0.007872 0.007842 0.006899 0.005723 [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 3.48e-07 6.72e-07 1.00e-06 3.24e-06 2.83e-06 5.27e-06 erg/cm2
Error 3.35e-08 3.75e-08 6.31e-08 4.63e-07 1.54e-07 5.00e-07 erg/cm2
Peak flux Power-law 3.38e-01 3.90e-01 3.22e-01 4.48e-01 1.21e+00 1.50e+00 ph/cm2/s
Error 1.05e-01 6.95e-02 5.71e-02 1.84e-01 1.86e-01 2.29e-01 ph/cm2/s
Fluence Cutoff-PL 3.44e-07 6.75e-07 1.01e-06 2.99e-06 2.82e-06 5.01e-06 erg/cm2
Error 3.83e-08 4.06e-08 6.71e-08 9.21e-07 1.65e-07 9.35e-07 erg/cm2
Peak flux Cutoff-PL 3.51e-01 3.95e-01 3.18e-01 4.25e-01 1.22e+00 1.48e+00 ph/cm2/s
Error 1.06e-01 7.02e-02 5.77e-02 -------- 1.87e-01 2.37e-01 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 1.420 0.093 - - 2.83e-03 1.41e-04 36.490 57
CPL 1.350 0.243 452.7 0.0 3.05e-03 8.05e-04 36.540 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.273 0.297 - - 1.02e-02 1.49e-03 39.550 57
CPL 1.271 0.279 10000.0 0.0 1.03e-02 -4.38e-03 39.580 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: 110.976000 sec.
T50 in the 50-300 keV band: 37.312000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 103.896 -18.452 85.444
T90 81.160 -7.988 73.172
T50 39.948 17.140 57.088
Peak 1.000 47.808 48.808
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
225.3614 +30.9368 0.0072 23.5 -12.7 4.3896 26.7 TRIG_00868984
------------------------------------------
Foreground time interval of the image:
-18.452 85.444 (delta_t = 103.896 [sec])
Background time interval of the image:
-239.216 -18.452 (delta_t = 220.764 [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 -18.452 sec. to 85.444 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41958 ( -0.0929859 0.0928194 )
Norm@50keV : 2.82836E-03 ( -0.000140733 0.000140635 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.49 using 59 PHA bins.
# Reduced chi-squared = 0.6401 for 57 degrees of freedom
# Null hypothesis probability = 9.843097e-01
Photon flux (15-150 keV) in 103.9 sec: 0.346003 ( -0.0181574 0.0182242 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.82841e-06 ( -1.53633e-07 1.54264e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -18.452 sec. to 85.444 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34955 ( -0.360737 0.126009 )
Epeak [keV] : 452.712 ( -843.363 -843.363 )
Norm@50keV : 3.05488E-03 ( -0.000245604 0.00136479 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.54 using 59 PHA bins.
# Reduced chi-squared = 0.6525 for 56 degrees of freedom
# Null hypothesis probability = 9.795257e-01
Photon flux (15-150 keV) in 103.9 sec: 0.344826 ( -0.019097 0.019088 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.81834e-06 ( -1.6677e-07 1.64058e-07 ) ergs/cm2
Band function
Time interval is from -18.452 sec. to 85.444 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.926862 ( 0.919831 0.919831 )
beta : -1.45232 ( 1.45217 0.118527 )
Epeak [keV] : 70.7249 ( -68.4335 -68.4335 )
Norm@50keV : 5.85822E-03 ( -0.00343214 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.11 using 59 PHA bins.
# Reduced chi-squared = 0.6565 for 55 degrees of freedom
# Null hypothesis probability = 9.770670e-01
Photon flux (15-150 keV) in 103.9 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] : 16.6159 ( )
R^2/D10^2 : 2.70545E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 133.70 using 59 PHA bins.
# Reduced chi-squared = 2.3457 for 57 degrees of freedom
# Null hypothesis probability = 4.186807e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.590e-07 1.512e-08
25- 50 6.907e-07 4.655e-08
50-150 1.351e-06 1.314e-07
15-150 2.201e-06 1.387e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-16.9009 -200)
Norm : 1.43042 (-0.0711418 0.0711418)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.74 using 59 PHA bins.
# Reduced chi-squared = 0.7849 for 57 degrees of freedom
# Null hypothesis probability = 8.808495e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.701e-07 2.088e-08
25- 50 7.119e-07 4.031e-08
50-150 1.561e-06 1.060e-07
15-150 2.643e-06 1.631e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.76568 (-1.28017 1.40868)
R1^2/D10^2 : 0.249365 (-0.103266 0.20926)
kT2 [keV] : 31.9600 (-5.74834 10.1081)
R2^2/D10^2 : 2.40756E-03 (-0.00139007 0.00235127)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.03 using 59 PHA bins.
# Reduced chi-squared = 0.6914 for 55 degrees of freedom
# Null hypothesis probability = 9.606063e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.145e-07 5.824e-08
25- 50 7.016e-07 1.145e-07
50-150 1.815e-06 4.610e-07
15-150 2.831e-06 5.112e-07
Peak spectrum fit
Power-law model
Time interval is from 47.808 sec. to 48.808 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27309 ( -0.300691 0.292389 )
Norm@50keV : 1.02096E-02 ( -0.00148751 0.0014874 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.55 using 59 PHA bins.
# Reduced chi-squared = 0.6938 for 57 degrees of freedom
# Null hypothesis probability = 9.620559e-01
Photon flux (15-150 keV) in 1 sec: 1.21219 ( -0.185365 0.186269 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01567e-07 ( -1.66366e-08 1.67974e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 47.808 sec. to 48.808 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27070 ( -0.287123 0.271446 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 1.02527E-02 ( -0.00149403 -0.0102527 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.58 using 59 PHA bins.
# Reduced chi-squared = 0.7068 for 56 degrees of freedom
# Null hypothesis probability = 9.526761e-01
Photon flux (15-150 keV) in 1 sec: 1.21901 ( -0.19455 0.18018 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01254e-07 ( -1.63513e-08 1.558e-08 ) ergs/cm2
Band function
Time interval is from 47.808 sec. to 48.808 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01829 ( 1.01909 1.01909 )
beta : -1.27296 ( 1.273 0.301737 )
Epeak [keV] : 47.4208 ( -46.6888 -46.6888 )
Norm@50keV : 1.88238E-02 ( -0.0101137 1.57095 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.55 using 59 PHA bins.
# Reduced chi-squared = 0.7191 for 55 degrees of freedom
# Null hypothesis probability = 9.422709e-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] : 20.8357 (-5.74567 8.77332)
R^2/D10^2 : 4.45452E-02 (-0.0438081 0.0838568)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.08 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 57 degrees of freedom
# Null hypothesis probability = 2.702028e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.666e-09 1.343e-09
25- 50 1.875e-08 5.788e-09
50-150 6.063e-08 1.832e-08
15-150 8.304e-08 2.216e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-56.4832 -200)
Norm : 5.01666 (-0.745379 0.745379)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.40 using 59 PHA bins.
# Reduced chi-squared = 0.7789 for 57 degrees of freedom
# Null hypothesis probability = 8.881302e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.249e-08 7.125e-09
25- 50 2.403e-08 1.351e-08
50-150 5.271e-08 2.979e-08
15-150 8.923e-08 5.055e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.24511 (-2.35199 2.80089)
R1^2/D10^2 : 1.28134 (-0.893241 4.58312)
kT2 [keV] : 58.5071 (-26.2317 -58.5099)
R2^2/D10^2 : 2.15817E-03 (-0.00186618 0.00803605)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.04 using 59 PHA bins.
# Reduced chi-squared = 0.6553 for 55 degrees of freedom
# Null hypothesis probability = 9.775270e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.189e-08 6.645e-09
25- 50 2.167e-08 1.129e-08
50-150 7.787e-08 4.059e-08
15-150 1.114e-07 5.780e-08
Plot creation:
Sun Oct 28 05:15:57 EDT 2018