batgrbproduct analysis for trigger=846868
batgrbproduct Analysis for Trigger=846868
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): Tue Jul 10 10:25:27 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger846868/GCN5_download_cron
======================================================================
Trigger: 00846868 Segment: 000
BAT Trigger Time: 552826341.504 [s; MET]
Trigger Stop: 552826349.696 [s; MET]
UTC: 2018-07-09T10:52:00.268380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 38.1190695176549 Dec: 60.3717433056486 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.13
Image Trigger?: NO
Rate S/N Ratio: 15.556349186104 [ if not an image trigger ]
Image S/N Ratio: 9.13
Flight Position: [ source = BAT ]
RA: 38.1190695176549 Dec: 60.3717433056486 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 38.0862068166974 Dec: 60.3331729277872 [deg; J2000]
{ 02h 32m 20.7s , +60d 19' 59.4" }
+/- 1.56404473892175 [arcmin] (estimated 90% radius based on SNR)
+/- 0.663124535574664 [arcmin] (formal 1-sigma fit error)
SNR: 16.0553420804241
Angular difference between Flight and Ground position is 2.511364 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 215.071999907494 +/- 28.8523979094298
Measured from: 2.84800016880035
to: 217.920000076294 [s; relative to TRIGTIME]
T50: 133.791999936104 +/- 84.9068301773876
Measured from: 11.0320001840591
to: 144.824000120163 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.73199999332428
to: 9.73199999332428 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.544000029563904
to: 243.460000038147 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.627458 0.732654 0.675016 0.140656
0.094365 0.097350 0.085901 0.078402 [error]
Peak 0.018102 0.024548 0.028868 0.011033
0.007027 0.006986 0.006393 0.005653 [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 1.66e-07 3.29e-07 5.07e-07 1.71e-06 1.42e-06 2.72e-06 erg/cm2
Error 3.77e-08 4.44e-08 8.59e-08 6.47e-07 2.09e-07 7.08e-07 erg/cm2
Peak flux Power-law 1.32e-01 1.77e-01 1.76e-01 3.15e-01 5.88e-01 8.01e-01 ph/cm2/s
Error 7.49e-02 6.07e-02 5.08e-02 2.12e-01 1.61e-01 2.36e-01 ph/cm2/s
Fluence Cutoff-PL 1.67e-07 3.30e-07 5.06e-07 1.69e-06 1.42e-06 2.69e-06 erg/cm2
Error 3.84e-08 4.62e-08 8.58e-08 8.89e-07 2.09e-07 7.13e-07 erg/cm2
Peak flux Cutoff-PL 1.28e-01 1.78e-01 1.78e-01 2.88e-01 5.85e-01 7.71e-01 ph/cm2/s
Error 8.55e-02 6.29e-02 5.75e-02 2.95e-01 1.65e-01 2.86e-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 1.375 0.234 - - 6.01e-04 7.76e-05 46.060 57
CPL 1.376 0.235 9999.4 0.0 6.02e-04 5.58e-04 46.070 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.011 0.506 - - 5.10e-03 1.37e-03 63.440 57
CPL 0.924 0.569 734.8 0.0 5.56e-03 1.40e-02 63.430 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: 34.368000 sec.
T50 in the 50-300 keV band: 13.248000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 242.916 0.544 243.460
T90 215.072 2.848 217.920
T50 133.792 11.032 144.824
Peak 1.000 8.732 9.732
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
38.0862 +60.3332 0.0120 20.0 -117.5 1.4840 16.1 TRIG_00846868
------------------------------------------
Foreground time interval of the image:
0.544 49.597 (delta_t = 49.053 [sec])
Background time interval of the image:
-239.504 -117.448 (delta_t = 122.056 [sec])
-116.504 0.544 (delta_t = 117.048 [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 0.544 sec. to 243.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37486 ( -0.233737 0.233432 )
Norm@50keV : 6.01143E-04 ( -7.78393e-05 7.73397e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.06 using 59 PHA bins.
# Reduced chi-squared = 0.8080 for 57 degrees of freedom
# Null hypothesis probability = 8.497234e-01
Photon flux (15-150 keV) in 242.9 sec: 7.28012E-02 ( -0.00933643 0.00935 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41837e-06 ( -2.07488e-07 2.1063e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.544 sec. to 243.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37597 ( -0.239318 0.230993 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 6.02016E-04 ( -0.000510157 0.000605327 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.07 using 59 PHA bins.
# Reduced chi-squared = 0.8226 for 56 degrees of freedom
# Null hypothesis probability = 8.255313e-01
Photon flux (15-150 keV) in 242.9 sec: 7.28226E-02 ( -0.0093812 0.0093013 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41581e-06 ( -2.07279e-07 2.10325e-07 ) ergs/cm2
Band function
Time interval is from 0.544 sec. to 243.460 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.83877 ( -4.83877 -4.83877 )
beta : -1.44379 ( -0.302096 0.260282 )
Epeak [keV] : 24.1381 ( -24.1381 6.66117 )
Norm@50keV : 53.9090 ( -6.79445 268555 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.69 using 59 PHA bins.
# Reduced chi-squared = 0.8307 for 55 degrees of freedom
# Null hypothesis probability = 8.103470e-01
Photon flux (15-150 keV) in 242.9 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] : 17.0427 (-3.40634 4.29141)
R^2/D10^2 : 5.25097E-03 (-0.00520569 0.00594078)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.31 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 57 degrees of freedom
# Null hypothesis probability = 1.271158e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.540e-08 2.074e-08
25- 50 3.343e-07 6.595e-08
50-150 6.937e-07 1.831e-07
15-150 1.103e-06 2.318e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-59.6595 -200)
Norm : 0.298303 (-0.0379145 0.0379145)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.46 using 59 PHA bins.
# Reduced chi-squared = 0.8502 for 57 degrees of freedom
# Null hypothesis probability = 7.823350e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.804e-07 1.012e-07
25- 50 3.471e-07 1.918e-07
50-150 7.612e-07 4.139e-07
15-150 1.289e-06 7.173e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.39626 (-1.56456 1.99432)
R1^2/D10^2 : 0.111237 (-0.0696417 0.213239)
kT2 [keV] : 32.4739 (-8.95993 21.0487)
R2^2/D10^2 : 5.49170E-04 (-0.00040989 0.000966953)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.72 using 59 PHA bins.
# Reduced chi-squared = 0.7767 for 55 degrees of freedom
# Null hypothesis probability = 8.861812e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.810e-07 9.321e-08
25- 50 3.162e-07 1.314e-07
50-150 9.796e-07 5.329e-07
15-150 1.477e-06 6.569e-07
Peak spectrum fit
Power-law model
Time interval is from 8.732 sec. to 9.732 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01119 ( -0.525557 0.48564 )
Norm@50keV : 5.10117E-03 ( -0.00137742 0.00135702 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.44 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 57 degrees of freedom
# Null hypothesis probability = 2.597719e-01
Photon flux (15-150 keV) in 1 sec: 0.587746 ( -0.160119 0.16125 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.50802e-08 ( -1.58249e-08 1.58255e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.732 sec. to 9.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.923717 ( -2.05782 -0.920427 )
Epeak [keV] : 734.796 ( -720.385 -720.385 )
Norm@50keV : 5.55645E-03 ( -0.00174861 0.0262306 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.43 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 56 degrees of freedom
# Null hypothesis probability = 2.309112e-01
Photon flux (15-150 keV) in 1 sec: 0.584920 ( -0.166284 0.163495 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.47661e-08 ( -1.62324e-08 1.60791e-08 ) ergs/cm2
Band function
Time interval is from 8.732 sec. to 9.732 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00516 ( -0.693425 1.5152 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 9997.49 ( -9917.63 -9997.49 )
Norm@50keV : 5.13078E-03 ( -0.00135455 0.0267998 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.44 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 55 degrees of freedom
# Null hypothesis probability = 2.032957e-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] : 26.0789 (-8.55768 15.0719)
R^2/D10^2 : 1.22663E-02 (-0.0122531 0.0293895)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.38 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 57 degrees of freedom
# Null hypothesis probability = 1.850132e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.417e-09 9.000e-10
25- 50 8.207e-09 4.849e-09
50-150 4.109e-08 2.557e-08
15-150 5.071e-08 2.995e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-88.4305 -200)
Norm : 2.41528 (-0.663531 0.663531)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.92 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 57 degrees of freedom
# Null hypothesis probability = 1.730678e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.014e-09 3.720e-09
25- 50 1.157e-08 6.865e-09
50-150 2.537e-08 1.547e-08
15-150 4.296e-08 2.664e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.40269 (-2.79394 6.09706)
R1^2/D10^2 : 0.691579 (-0.684414 5.24853)
kT2 [keV] : 36.3312 (-13.4488 55.8147)
R2^2/D10^2 : 4.13827E-03 (-0.00385801 0.00813375)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.64 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 55 degrees of freedom
# Null hypothesis probability = 2.507608e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.866e-09 3.198e-09
25- 50 9.700e-09 5.340e-09
50-150 4.270e-08 2.664e-08
15-150 5.726e-08 3.221e-08
Plot creation:
Tue Jul 10 10:29:49 EDT 2018