batgrbproduct analysis for trigger=846395
batgrbproduct Analysis for Trigger=846395
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): Sat Jul 7 11:44:31 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger846395/GCN5_download_cron
======================================================================
Trigger: 00846395 Segment: 000
BAT Trigger Time: 552558301.632 [s; MET]
Trigger Stop: 552558303.68 [s; MET]
UTC: 2018-07-06T08:24:40.412760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 181.665199303239 Dec: 66.0347153838887 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.89
Image Trigger?: NO
Rate S/N Ratio: 14.3527000944073 [ if not an image trigger ]
Image S/N Ratio: 8.89
Flight Position: [ source = BAT ]
RA: 181.665199303239 Dec: 66.0347153838887 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 181.681674712599 Dec: 66.0440665541218 [deg; J2000]
{ 12h 06m 43.6s , +66d 02' 38.6" }
+/- 1.05029882646938 [arcmin] (estimated 90% radius based on SNR)
+/- 0.298812672915144 [arcmin] (formal 1-sigma fit error)
SNR: 28.3577264112023
Angular difference between Flight and Ground position is 0.689899 arcmin
Partial Coding Fraction: 0.8671875 [ including projection effects ]
Duration
T90: 42.3040000200272 +/- 7.29554847120756
Measured from: -1.97199988365173
to: 40.3320001363754 [s; relative to TRIGTIME]
T50: 20.6999999284744 +/- 10.6658064782344
Measured from: 9.60800015926361
to: 30.308000087738 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 27.8240000009537
to: 28.8240000009537 [s; relative to TRIGTIME]
Total Fluence
Measured from: -16.3119999170303
to: 50.9919999837875 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.587053 1.738056 0.939154 0.167257
0.052648 0.054043 0.045772 0.038269 [error]
Peak 0.122394 0.150310 0.101321 0.015115
0.007978 0.008511 0.007671 0.005062 [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 4.94e-07 7.10e-07 7.57e-07 1.50e-06 2.43e-06 3.46e-06 erg/cm2
Error 3.34e-08 2.87e-08 4.64e-08 1.94e-07 1.06e-07 2.33e-07 erg/cm2
Peak flux Power-law 1.20e+00 1.08e+00 6.64e-01 6.21e-01 3.21e+00 3.56e+00 ph/cm2/s
Error 1.25e-01 7.19e-02 6.11e-02 1.12e-01 2.12e-01 2.36e-01 ph/cm2/s
Fluence Cutoff-PL 4.65e-07 7.36e-07 7.59e-07 8.03e-07 2.33e-06 2.76e-06 erg/cm2
Error 4.03e-08 3.53e-08 4.92e-08 3.90e-07 1.28e-07 4.14e-07 erg/cm2
Peak flux Cutoff-PL 1.08e+00 1.15e+00 6.91e-01 2.98e-01 3.12e+00 3.23e+00 ph/cm2/s
Error 1.48e-01 9.03e-02 6.91e-02 1.54e-01 2.20e-01 2.69e-01 ph/cm2/s
Fluence Band 4.57e-07 7.36e-07 7.49e-07 1.06e-06 2.33e-06 3.01e-06 erg/cm2
Error 4.16e-08 -------- -------- -------- 1.27e-07 -------- erg/cm2
Peak flux Band 1.08e+00 1.16e+00 6.90e-01 3.54e-01 3.12e+00 3.28e+00 ph/cm2/s
Error -------- 9.27e-02 -------- -------- 2.19e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.907 0.078 - - 3.92e-03 1.73e-04 55.470 57
CPL 1.504 0.328 57.2 24.9 6.39e-03 2.59e-03 50.610 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.698 0.114 - - 2.42e-02 1.73e-03 54.110 57
CPL 1.021 0.494 68.8 30.2 5.49e-02 3.53e-02 47.660 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: 36.480000 sec.
T50 in the 50-300 keV band: 7.168000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 67.304 -16.312 50.992
T90 42.304 -1.972 40.332
T50 20.700 9.608 30.308
Peak 1.000 27.824 28.824
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
181.6817 +66.0441 0.0068 20.9 153.3 2.2964 28.4 TRIG_00846395
------------------------------------------
Foreground time interval of the image:
-16.312 26.769 (delta_t = 43.081 [sec])
Background time interval of the image:
-239.632 -16.312 (delta_t = 223.320 [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 -16.312 sec. to 50.992 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90668 ( -0.0777356 0.0786935 )
Norm@50keV : 3.92261E-03 ( -0.000173696 0.000172613 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.47 using 59 PHA bins.
# Reduced chi-squared = 0.9732 for 57 degrees of freedom
# Null hypothesis probability = 5.325505e-01
Photon flux (15-150 keV) in 67.3 sec: 0.564539 ( -0.0237626 0.0238252 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.42722e-06 ( -1.05924e-07 1.06454e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -16.312 sec. to 50.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50419 ( -0.340782 0.314854 )
Epeak [keV] : 57.1503 ( -10.2411 39.624 )
Norm@50keV : 6.39023E-03 ( -0.00198505 0.00320327 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.61 using 59 PHA bins.
# Reduced chi-squared = 0.9038 for 56 degrees of freedom
# Null hypothesis probability = 6.781601e-01
Photon flux (15-150 keV) in 67.3 sec: 0.549343 ( -0.026345 0.026392 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33392e-06 ( -1.27318e-07 1.2787e-07 ) ergs/cm2
Band function
Time interval is from -16.312 sec. to 50.992 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.45140 ( -0.344816 1.44738 )
beta : -2.29886 ( 2.29174 0.347286 )
Epeak [keV] : 54.6270 ( -30.1015 34.594 )
Norm@50keV : 6.86050E-03 ( -0.00212254 2.51234 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.25 using 59 PHA bins.
# Reduced chi-squared = 0.9137 for 55 degrees of freedom
# Null hypothesis probability = 6.561903e-01
Photon flux (15-150 keV) in 67.3 sec: 0.663405 ( 6.33659 -0.031097 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33398e-06 ( -2.33351e-06 -1.26921e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.8043 ( )
R^2/D10^2 : 0.134614 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 169.82 using 59 PHA bins.
# Reduced chi-squared = 2.9793 for 57 degrees of freedom
# Null hypothesis probability = 3.788744e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.666e-07 2.157e-08
25- 50 8.228e-07 3.836e-08
50-150 6.817e-07 6.690e-08
15-150 1.771e-06 7.369e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 85.4501 (-11.5392 14.6355)
Norm : 2.54737 (-0.166002 0.181814)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.55 using 59 PHA bins.
# Reduced chi-squared = 0.9043 for 57 degrees of freedom
# Null hypothesis probability = 6.790219e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.465e-07 2.907e-08
25- 50 7.464e-07 3.028e-08
50-150 1.100e-06 1.057e-07
15-150 2.293e-06 1.121e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.68254 (-0.835372 0.976035)
R1^2/D10^2 : 1.40838 (-0.611799 1.22228)
kT2 [keV] : 19.0950 (-2.28354 3.31987)
R2^2/D10^2 : 1.69080E-02 (-0.00812187 0.0117523)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.73 using 59 PHA bins.
# Reduced chi-squared = 0.9952 for 55 degrees of freedom
# Null hypothesis probability = 4.847325e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.559e-07 6.949e-08
25- 50 7.239e-07 7.393e-08
50-150 1.078e-06 1.551e-07
15-150 2.258e-06 2.843e-07
Peak spectrum fit
Power-law model
Time interval is from 27.824 sec. to 28.824 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69840 ( -0.112332 0.114898 )
Norm@50keV : 2.41515E-02 ( -0.00173352 0.00171866 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.11 using 59 PHA bins.
# Reduced chi-squared = 0.9492 for 57 degrees of freedom
# Null hypothesis probability = 5.842966e-01
Photon flux (15-150 keV) in 1 sec: 3.20579 ( -0.212256 0.212373 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.23642e-07 ( -1.68251e-08 1.69531e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 27.824 sec. to 28.824 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02143 ( -0.521791 0.465947 )
Epeak [keV] : 68.7969 ( -13.1566 47.2739 )
Norm@50keV : 5.49029E-02 ( -0.0232709 0.0472913 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.66 using 59 PHA bins.
# Reduced chi-squared = 0.8511 for 56 degrees of freedom
# Null hypothesis probability = 7.785236e-01
Photon flux (15-150 keV) in 1 sec: 3.12248 ( -0.22004 0.21978 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13088e-07 ( -1.8376e-08 1.8503e-08 ) ergs/cm2
Band function
Time interval is from 27.824 sec. to 28.824 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01083 ( -0.469832 0.911645 )
beta : -2.58694 ( 2.55972 0.729259 )
Epeak [keV] : 68.0285 ( -14.3075 46.8033 )
Norm@50keV : 5.57615E-02 ( -0.0188004 0.193183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.60 using 59 PHA bins.
# Reduced chi-squared = 0.8655 for 55 degrees of freedom
# Null hypothesis probability = 7.503121e-01
Photon flux (15-150 keV) in 1 sec: 3.12036 ( 3.87964 -0.2197 ) 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] : 13.1185 (-1.04038 1.11866)
R^2/D10^2 : 0.573081 (-0.146616 0.198374)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.46 using 59 PHA bins.
# Reduced chi-squared = 1.552 for 57 degrees of freedom
# Null hypothesis probability = 4.774017e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.091e-08 2.355e-09
25- 50 7.274e-08 5.950e-09
50-150 7.956e-08 1.253e-08
15-150 1.732e-07 1.460e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 129.288 (-31.576 46.8994)
Norm : 13.5309 (-1.05374 1.2391)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.48 using 59 PHA bins.
# Reduced chi-squared = 0.8506 for 57 degrees of freedom
# Null hypothesis probability = 7.816532e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.512e-08 3.350e-09
25- 50 6.362e-08 6.630e-09
50-150 1.177e-07 3.855e-08
15-150 2.164e-07 4.550e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.48891 (-1.22313 1.55921)
R1^2/D10^2 : 7.47867 (-4.31992 12.6279)
kT2 [keV] : 18.8909 (-2.60638 4.03851)
R2^2/D10^2 : 0.123790 (-0.068202 0.101966)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.96 using 59 PHA bins.
# Reduced chi-squared = 0.8537 for 55 degrees of freedom
# Null hypothesis probability = 7.714295e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.474e-08 1.267e-08
25- 50 6.294e-08 1.410e-08
50-150 1.105e-07 2.853e-08
15-150 2.082e-07 4.890e-08
Plot creation:
Sat Jul 7 11:47:42 EDT 2018