batgrbproduct analysis for trigger=796115
batgrbproduct Analysis for Trigger=796115
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 Dec 10 17:21:35 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger796115/GCN5_download_cron
======================================================================
Trigger: 00796115 Segment: 000
BAT Trigger Time: 534535056 [s; MET]
Trigger Stop: 534535120 [s; MET]
UTC: 2017-12-09T17:57:15.870420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 134.821278843895 Dec: -55.2257345116493 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.23
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.23
Flight Position: [ source = BAT ]
RA: 134.821278843895 Dec: -55.2257345116493 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 134.836874634284 Dec: -55.2321337242217 [deg; J2000]
{ 08h 59m 20.8s , -55d 13' 55.7" }
+/- 3.90621969492253 [arcmin] (estimated 90% radius based on SNR)
+/- 2.27823202381852 [arcmin] (formal 1-sigma fit error)
SNR: 4.3426188699098
Angular difference between Flight and Ground position is 0.657425 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 63 +/- 22.2036033111745
Measured from: 1.19209289550781e-07
to: 63.0000001192093 [s; relative to TRIGTIME]
T50: 30 +/- 20.6155281280883
Measured from: 14.0000001192093
to: 44.0000001192093 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 17
to: 18 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 66 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.218730 0.246238 0.094603 0.009817
0.053472 0.054919 0.048320 0.044389 [error]
Peak 0.014760 0.007755 0.014212 -0.000096
0.006561 0.006691 0.006061 0.005420 [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 6.78e-08 8.92e-08 8.62e-08 1.48e-07 2.92e-07 3.91e-07 erg/cm2
Error 2.25e-08 2.49e-08 4.14e-08 1.65e-07 9.87e-08 1.92e-07 erg/cm2
Peak flux Power-law 1.02e-01 1.02e-01 7.20e-02 8.03e-02 3.08e-01 3.57e-01 ph/cm2/s
Error 8.98e-02 7.80e-02 6.04e-02 1.40e-01 2.33e-01 1.88e-01 ph/cm2/s
Fluence Cutoff-PL 6.31e-08 1.16e-07 4.69e-08 2.00e-09 2.28e-07 2.28e-07 erg/cm2
Error 2.58e-08 3.88e-08 5.85e-08 9.47e-08 9.54e-08 1.49e-07 erg/cm2
Peak flux Cutoff-PL 1.06e-01 1.03e-01 7.01e-02 7.46e-02 3.09e-01 3.56e-01 ph/cm2/s
Error 1.01e-01 5.83e-02 5.42e-02 1.39e-01 2.33e-01 2.01e-01 ph/cm2/s
Fluence Band 6.24e-08 1.15e-07 5.86e-08 3.58e-08 2.54e-07 2.72e-07 erg/cm2
Error 2.68e-08 3.87e-08 -------- -------- 1.01e-07 -------- 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 2.050 0.488 - - 4.78e-04 1.73e-04 40.660 57
CPL -0.274 4.798 34.2 0.0 1.49e-02 4.77e+02 38.260 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.507 1.182 - - 2.46e-03 1.88e-03 62.290 57
CPL 3.904 1.191 450.6 0.0 1.86e-04 0.00e+00 62.030 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 66.000 0.000 66.000
T90 63.000 0.000 63.000
T50 30.000 14.000 44.000
Peak 1.000 17.000 18.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
134.8369 -55.2321 0.0443 24.9 -27.6 0.5235 4.3 TRIG_00796115
------------------------------------------
Foreground time interval of the image:
0.000 66.000 (delta_t = 66.000 [sec])
Background time interval of the image:
-239.000 0.000 (delta_t = 239.000 [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 0.000 sec. to 66.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05021 ( -0.45145 0.524569 )
Norm@50keV : 4.78484E-04 ( -0.000174958 0.000170791 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.66 using 59 PHA bins.
# Reduced chi-squared = 0.7133 for 57 degrees of freedom
# Null hypothesis probability = 9.498694e-01
Photon flux (15-150 keV) in 66 sec: 7.34802E-02 ( -0.0195814 0.0195966 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.92132e-07 ( -9.49991e-08 1.02491e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 66.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.274435 ( -7.08838 2.50699 )
Epeak [keV] : 34.1589 ( -34.0798 -34.0798 )
Norm@50keV : 1.49103E-02 ( -0.0177094 954.96 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.26 using 59 PHA bins.
# Reduced chi-squared = 0.6832 for 56 degrees of freedom
# Null hypothesis probability = 9.664469e-01
Photon flux (15-150 keV) in 66 sec: 6.95162E-02 ( -0.0191273 0.019761 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28202e-07 ( -7.32118e-08 1.17619e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 66.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.49324 ( -3.51418 -1.52635 )
beta : -3.14715 ( 3.15752 1.25692 )
Epeak [keV] : 31.6420 ( -13.8862 28.0616 )
Norm@50keV : 0.110275 ( -0.133568 18.9326 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.70 using 59 PHA bins.
# Reduced chi-squared = 0.6854 for 55 degrees of freedom
# Null hypothesis probability = 9.639052e-01
Photon flux (15-150 keV) in 66 sec: 6.99286E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54091e-07 ( -2.53629e-07 -9.22046e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.49627 (-1.90349 2.57429)
R^2/D10^2 : 6.86554E-02 (-0.0445439 0.115437)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.30 using 59 PHA bins.
# Reduced chi-squared = 0.6720 for 57 degrees of freedom
# Null hypothesis probability = 9.729480e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.163e-08 3.610e-08
25- 50 1.194e-07 6.917e-08
50-150 3.808e-08 2.939e-08
15-150 2.191e-07 1.114e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 51.7116 (-25.1163 81.2713)
Norm : 0.418408 (-0.148861 0.247565)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.18 using 59 PHA bins.
# Reduced chi-squared = 0.6873 for 57 degrees of freedom
# Null hypothesis probability = 9.655897e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.803e-08 2.910e-08
25- 50 9.887e-08 4.940e-08
50-150 9.905e-08 7.420e-08
15-150 2.659e-07 1.487e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 24.7746 (-24.2643 -24.2643)
R1^2/D10^2 : 3.47284E-04 (-0.000359615 0.161396)
kT2 [keV] : 7.56552 (-7.56619 3.06166)
R2^2/D10^2 : 9.52137E-02 (-0.09501 -0.09501)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.07 using 59 PHA bins.
#Fit statistic : Chi-Squared = 37.65 using 59 PHA bins.
# Reduced chi-squared = 0.6921 for 55 degrees of freedom
# Reduced chi-squared = 0.6846 for 55 degrees of freedom
# Null hypothesis probability = 9.602046e-01
# Null hypothesis probability = 9.643478e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.374e-08 1.831e-07
25- 50 1.149e-07 6.201e-07
50-150 5.500e-08 1.156e-06
15-150 2.336e-07 2.059e-06
Peak spectrum fit
Power-law model
Time interval is from 17.000 sec. to 18.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50744 ( -1.08661 1.27811 )
Norm@50keV : 2.46421E-03 ( -0.0024642 0.00128834 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.29 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 57 degrees of freedom
# Null hypothesis probability = 2.937257e-01
Photon flux (15-150 keV) in 1 sec: 0.308251 ( -0.308251 0.157216 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33489e-08 ( -1.35704e-08 1.43851e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.000 sec. to 18.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.90442 ( -1.10024 1.28111 )
Epeak [keV] : 450.641 ( -9999.36 -9999.36 )
Norm@50keV : 1.86341E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.03 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 56 degrees of freedom
# Null hypothesis probability = 2.699859e-01
Photon flux (15-150 keV) in 1 sec: 0.309249 ( -0.309249 0.156113 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33681e-08 ( -1.36238e-08 1.42526e-08 ) ergs/cm2
Band function
Time interval is from 17.000 sec. to 18.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51513 ( -2.00092 2.80595 )
beta : -9.37110 ( 9.3711 9.3711 )
Epeak [keV] : 9999.36 ( -9983.79 -9999.36 )
Norm@50keV : 2.46505E-03 ( -0.00135878 0.111574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.29 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 55 degrees of freedom
# Null hypothesis probability = 2.329436e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82043e-09 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.9629 (-21.9717 33.2376)
R^2/D10^2 : 9.53424E-03 (-0.00952334 1.32752)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.00 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 57 degrees of freedom
# Null hypothesis probability = 2.443855e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.518e-10 5.910e-10
25- 50 4.500e-09 2.987e-09
50-150 1.622e-08 1.223e-08
15-150 2.157e-08 1.503e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 1.24997 (-0.631539 1.20901)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.44 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 57 degrees of freedom
# Null hypothesis probability = 2.891168e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.113e-09 2.045e-09
25- 50 5.987e-09 3.996e-09
50-150 1.313e-08 8.845e-09
15-150 2.223e-08 1.539e-08
Double BB
# Reduced chi-squared = 1.095 for 55 degrees of freedom
# Reduced chi-squared = 1.094 for 55 degrees of freedom
# Reduced chi-squared = 1.094 for 55 degrees of freedom
# Null hypothesis probability = 2.602180e-01
# Null hypothesis probability = 2.664828e-01
# Null hypothesis probability = 2.681824e-01
# Null hypothesis probability = 2.770727e-01
# Null hypothesis probability = 2.839418e-01
# Null hypothesis probability = 2.886483e-01
# Null hypothesis probability = 2.914540e-01
# Null hypothesis probability = 2.930821e-01
# Null hypothesis probability = 2.939724e-01
# Null hypothesis probability = 2.944502e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.834e-09 2.580e-09
25- 50 4.731e-09 2.522e-09
50-150 1.690e-08 1.147e-08
15-150 2.547e-08 1.513e-08
Plot creation:
Sun Dec 10 17:44:37 EST 2017