batgrbproduct analysis for trigger=874334
batgrbproduct Analysis for Trigger=874334
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): Mon Dec 3 02:26:23 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger874334/GCN5_download_cron
======================================================================
Trigger: 00874334 Segment: 000
BAT Trigger Time: 565425406.528 [s; MET]
Trigger Stop: 565425408.576 [s; MET]
UTC: 2018-12-02T06:36:24.513620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 280.744790864843 Dec: 27.9509889258757 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.16
Image Trigger?: NO
Rate S/N Ratio: 10.9087121146357 [ if not an image trigger ]
Image S/N Ratio: 7.16
Flight Position: [ source = BAT ]
RA: 280.744790864843 Dec: 27.9509889258757 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.736772914072 Dec: 27.9757931465511 [deg; J2000]
{ 18h 42m 56.8s , +27d 58' 32.9" }
+/- 2.00864299409093 [arcmin] (estimated 90% radius based on SNR)
+/- 1.04429953472037 [arcmin] (formal 1-sigma fit error)
SNR: 11.2305276002754
Angular difference between Flight and Ground position is 1.547723 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 6.55599987506866 +/- 0.608831638857355
Measured from: 0.0240001678466797
to: 6.58000004291534 [s; relative to TRIGTIME]
T50: 4.46799993515015 +/- 0.702270590915197
Measured from: 1.05600011348724
to: 5.52400004863739 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.692000031471252
to: 1.69200003147125 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.25600004196167
to: 6.75600004196167 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.128831 0.169958 0.122782 0.016381
0.020769 0.021177 0.018319 0.016010 [error]
Peak 0.040396 0.046913 0.022325 0.005660
0.008099 0.008419 0.007174 0.006127 [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 3.76e-08 6.48e-08 8.51e-08 2.27e-07 2.49e-07 4.15e-07 erg/cm2
Error 8.01e-09 8.99e-09 1.73e-08 9.54e-08 4.11e-08 1.11e-07 erg/cm2
Peak flux Power-law 3.62e-01 3.07e-01 1.77e-01 1.52e-01 9.13e-01 9.99e-01 ph/cm2/s
Error 1.01e-01 6.17e-02 5.48e-02 8.91e-02 1.84e-01 2.08e-01 ph/cm2/s
Fluence Cutoff-PL 3.50e-08 6.95e-08 8.64e-08 9.18e-08 2.36e-07 2.83e-07 erg/cm2
Error 9.12e-09 1.16e-08 1.90e-08 1.11e-07 4.48e-08 1.43e-07 erg/cm2
Peak flux Cutoff-PL 2.98e-01 3.83e-01 1.68e-01 1.78e-02 8.65e-01 8.66e-01 ph/cm2/s
Error 1.26e-01 9.44e-02 7.00e-02 6.04e-02 1.87e-01 1.91e-01 ph/cm2/s
Fluence Band 3.53e-08 6.82e-08 8.66e-08 1.28e-07 2.41e-07 3.19e-07 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.96e-01 3.84e-01 1.65e-01 3.77e-02 8.71e-01 8.84e-01 ph/cm2/s
Error -------- -------- -------- 4.75e-02 -------- 2.03e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.606 0.243 - - 3.80e-03 5.76e-04 46.710 57
CPL 1.016 0.914 77.3 -23.1 7.90e-03 1.27e-02 45.410 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.793 0.345 - - 6.64e-03 1.60e-03 67.860 57
CPL -0.254 2.362 45.5 29.1 1.01e-01 2.00e+00 64.250 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 7.012 -0.256 6.756
T90 6.556 0.024 6.580
T50 4.468 1.056 5.524
Peak 1.000 0.692 1.692
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.7368 +27.9758 0.0171 12.1 141.1 0.4320 11.2 TRIG_00874334
------------------------------------------
Foreground time interval of the image:
-0.256 6.756 (delta_t = 7.012 [sec])
Background time interval of the image:
-239.528 -0.256 (delta_t = 239.272 [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 -0.256 sec. to 6.756 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60648 ( -0.238801 0.24675 )
Norm@50keV : 3.80240E-03 ( -0.00058152 0.000570968 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.71 using 59 PHA bins.
# Reduced chi-squared = 0.8195 for 57 degrees of freedom
# Null hypothesis probability = 8.327905e-01
Photon flux (15-150 keV) in 7.012 sec: 0.489611 ( -0.0676311 0.0676539 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49157e-07 ( -4.0654e-08 4.16032e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.256 sec. to 6.756 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01564 ( -1.06849 0.760222 )
Epeak [keV] : 77.2812 ( -31.0044 -77.28 )
Norm@50keV : 7.90420E-03 ( -0.00451563 0.0209709 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.41 using 59 PHA bins.
# Reduced chi-squared = 0.8110 for 56 degrees of freedom
# Null hypothesis probability = 8.431012e-01
Photon flux (15-150 keV) in 7.012 sec: 0.478464 ( -0.069575 0.069579 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3619e-07 ( -4.38594e-08 4.57112e-08 ) ergs/cm2
Band function
Time interval is from -0.256 sec. to 6.756 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01671 ( -5.27352 1.05973 )
beta : -10.0000 ( 10 2.13163e-14 )
Epeak [keV] : 77.3354 ( -26.5619 -77.3354 )
Norm@50keV : 7.89271E-03 ( -0.00455457 0.0209889 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.41 using 59 PHA bins.
# Reduced chi-squared = 0.8257 for 55 degrees of freedom
# Null hypothesis probability = 8.182454e-01
Photon flux (15-150 keV) in 7.012 sec: 0.478509 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41283e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.5143 (-2.35446 2.8185)
R^2/D10^2 : 7.91054E-02 (-0.0385959 0.0772289)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.45 using 59 PHA bins.
# Reduced chi-squared = 0.9903 for 57 degrees of freedom
# Null hypothesis probability = 4.957970e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.146e-08 5.554e-09
25- 50 7.699e-08 1.600e-08
50-150 9.088e-08 2.922e-08
15-150 1.893e-07 3.709e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 162.720 (-77.0131 -161.474)
Norm : 2.01916 (-0.290178 0.372114)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.64 using 59 PHA bins.
# Reduced chi-squared = 0.8007 for 57 degrees of freedom
# Null hypothesis probability = 8.600263e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.609e-08 2.001e-08
25- 50 6.767e-08 3.692e-08
50-150 1.380e-07 8.057e-08
15-150 2.418e-07 1.368e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.63610 (-1.91466 2.52154)
R1^2/D10^2 : 1.07686 (-0.778501 4.40317)
kT2 [keV] : 20.7545 (-5.10359 9.93471)
R2^2/D10^2 : 1.39773E-02 (-0.0106078 0.026238)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.65 using 59 PHA bins.
# Reduced chi-squared = 0.7936 for 55 degrees of freedom
# Null hypothesis probability = 8.648314e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.698e-08 2.050e-08
25- 50 6.603e-08 3.386e-08
50-150 1.329e-07 7.850e-08
15-150 2.360e-07 1.225e-07
Peak spectrum fit
Power-law model
Time interval is from 0.692 sec. to 1.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79253 ( -0.330695 0.359342 )
Norm@50keV : 6.64384E-03 ( -0.00162118 0.00157324 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.86 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 57 degrees of freedom
# Null hypothesis probability = 1.536851e-01
Photon flux (15-150 keV) in 1 sec: 0.912870 ( -0.183665 0.183665 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.11839e-08 ( -1.47689e-08 1.54009e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.692 sec. to 1.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.254371 ( -2.85799 1.86675 )
Epeak [keV] : 45.4901 ( -10.3922 47.7441 )
Norm@50keV : 0.101254 ( -0.102435 3.90578 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.25 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 56 degrees of freedom
# Null hypothesis probability = 2.098762e-01
Photon flux (15-150 keV) in 1 sec: 0.864851 ( -0.186436 0.187669 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.18865e-08 ( -1.2904e-08 1.64081e-08 ) ergs/cm2
Band function
Time interval is from 0.692 sec. to 1.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.186007 ( -1.02272 2.88587 )
beta : -10.00000 ( 10 5.55472e-06 )
Epeak [keV] : 45.5779 ( -10.3444 47.227 )
Norm@50keV : 9.29415E-02 ( -0.0929415 3.96616 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.26 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 55 degrees of freedom
# Null hypothesis probability = 1.840053e-01
Photon flux (15-150 keV) in 1 sec: 0.870734 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.36486e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.2602 (-1.99086 2.44234)
R^2/D10^2 : 0.299940 (-0.156738 0.313693)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.80 using 59 PHA bins.
# Reduced chi-squared = 1.137 for 57 degrees of freedom
# Null hypothesis probability = 2.232739e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.980e-09 2.789e-09
25- 50 2.325e-08 9.064e-09
50-150 1.695e-08 7.867e-09
15-150 4.817e-08 1.529e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 87.0869 (-40.057 -87.1071)
Norm : 4.25679 (-1.04122 1.3833)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.01 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 57 degrees of freedom
# Null hypothesis probability = 1.935959e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.109e-08 3.256e-09
25- 50 1.863e-08 7.095e-09
50-150 2.779e-08 2.153e-08
15-150 5.751e-08 3.276e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.34525 (-3.51579 -3.51579)
R1^2/D10^2 : 9.29923 (-8.13189 -8.13189)
kT2 [keV] : 12.3291 (-2.70866 -12.4683)
R2^2/D10^2 : 0.198144 (-0.188818 0.311622)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.49 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 55 degrees of freedom
# Null hypothesis probability = 2.020462e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.698e-09 4.748e-09
25- 50 2.142e-08 1.238e-08
50-150 1.928e-08 1.212e-08
15-150 5.040e-08 2.917e-08
Plot creation:
Mon Dec 3 02:29:42 EST 2018