batgrbproduct analysis for trigger=850471
batgrbproduct Analysis for Trigger=850471
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 Jul 29 18:51:36 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger850471/GCN5_download_cron
======================================================================
Trigger: 00850471 Segment: 000
BAT Trigger Time: 554491762.048 [s; MET]
Trigger Stop: 554491762.56 [s; MET]
UTC: 2018-07-28T17:29:00.710460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 253.569321153668 Dec: -54.0307606838017 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.51
Image Trigger?: NO
Rate S/N Ratio: 19.6468827043885 [ if not an image trigger ]
Image S/N Ratio: 10.51
Flight Position: [ source = BAT ]
RA: 253.569321153668 Dec: -54.0307606838017 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 253.573584557955 Dec: -54.0371485825289 [deg; J2000]
{ 16h 54m 17.7s , -54d 02' 13.7" }
+/- 0.49858806055036 [arcmin] (estimated 90% radius based on SNR)
+/- 0.161335944158228 [arcmin] (formal 1-sigma fit error)
SNR: 82.2083065788685
Angular difference between Flight and Ground position is 0.411667 arcmin
Partial Coding Fraction: 0.5703125 [ including projection effects ]
Duration
T90: 8.6839998960495 +/- 0.297321378474679
Measured from: 11.672000169754
to: 20.3560000658035 [s; relative to TRIGTIME]
T50: 2.46399998664856 +/- 0.035777160144337
Measured from: 12.6840001344681
to: 15.1480001211166 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 12.6119999885559
to: 13.6119999885559 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.24399995803833
to: 36.5119999647141 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 18.316513 20.132249 11.805705 2.307314
0.102586 0.106955 0.087485 0.057003 [error]
Peak 4.769409 5.525579 3.452957 0.768666
0.046120 0.049667 0.040898 0.022944 [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 6.50e-06 8.98e-06 9.15e-06 1.70e-05 3.01e-05 4.16e-05 erg/cm2
Error 2.00e-07 1.61e-07 1.29e-07 5.62e-07 4.13e-07 6.06e-07 erg/cm2
Peak flux Power-law 5.49e+01 4.42e+01 2.40e+01 1.91e+01 1.32e+02 1.42e+02 ph/cm2/s
Error 1.96e+00 9.28e-01 4.23e-01 7.42e-01 2.86e+00 2.71e+00 ph/cm2/s
Fluence Cutoff-PL 6.37e-06 8.98e-06 9.22e-06 1.60e-05 2.99e-05 4.05e-05 erg/cm2
Error 2.85e-07 1.62e-07 1.59e-07 1.42e-06 4.39e-07 1.59e-06 erg/cm2
Peak flux Cutoff-PL 5.37e+01 4.41e+01 2.42e+01 1.82e+01 1.31e+02 1.40e+02 ph/cm2/s
Error 2.60e+00 8.09e-01 4.91e-01 1.44e+00 3.40e+00 3.75e+00 ph/cm2/s
Fluence Band 6.01e-06 9.00e-06 9.14e-06 1.68e-05 2.96e-05 4.11e-05 erg/cm2
Error -------- -------- 1.29e-07 -------- 5.77e-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 1.972 0.026 - - 8.88e-02 1.19e-03 44.780 57
CPL 1.908 0.101 88.3 -31.9 9.43e-02 6.82e-03 43.620 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.879 0.031 - - 9.25e-01 1.48e-02 42.740 57
CPL 1.860 0.084 429.6 0.0 9.43e-01 0.00e+00 42.660 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: 7.104000 sec.
T50 in the 50-300 keV band: 2.176000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 36.756 -0.244 36.512
T90 8.684 11.672 20.356
T50 2.464 12.684 15.148
Peak 1.000 12.612 13.612
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
253.5736 -54.0371 0.0023 35.8 15.4 54.2268 82.2 TRIG_00850471
------------------------------------------
Foreground time interval of the image:
-0.244 36.512 (delta_t = 36.756 [sec])
Background time interval of the image:
-239.048 -0.244 (delta_t = 238.804 [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 -0.244 sec. to 36.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97202 ( -0.0256501 0.0256072 )
Norm@50keV : 8.88161E-02 ( -0.00119411 0.00119247 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.78 using 59 PHA bins.
# Reduced chi-squared = 0.7857 for 57 degrees of freedom
# Null hypothesis probability = 8.798676e-01
Photon flux (15-150 keV) in 36.76 sec: 13.1539 ( -0.260318 0.262125 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.00691e-05 ( -4.12925e-07 4.13256e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.244 sec. to 36.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90813 ( -0.102506 0.100385 )
Epeak [keV] : 88.3305 ( -24.6098 -88.3306 )
Norm@50keV : 9.42723E-02 ( -0.00443196 0.00919972 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.62 using 59 PHA bins.
# Reduced chi-squared = 0.7789 for 56 degrees of freedom
# Null hypothesis probability = 8.858873e-01
Photon flux (15-150 keV) in 36.76 sec: 13.0270 ( -0.3197 0.3249 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99426e-05 ( -4.63691e-07 4.13918e-07 ) ergs/cm2
Band function
Time interval is from -0.244 sec. to 36.512 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.73893E-02 ( -0.614187 4.21807 )
beta : -1.98119 ( -0.0282789 0.027611 )
Epeak [keV] : 25.9181 ( -24.5684 49.5666 )
Norm@50keV : 2.16469 ( -2.1637 15427.3 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.05 using 59 PHA bins.
# Reduced chi-squared = 0.7645 for 55 degrees of freedom
# Null hypothesis probability = 9.001951e-01
Photon flux (15-150 keV) in 36.76 sec: 12.7740 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96356e-05 ( -2.96353e-05 -5.84337e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.8299 ( )
R^2/D10^2 : 0.737067 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1653.43 using 59 PHA bins.
# Reduced chi-squared = 29.0075 for 57 degrees of freedom
# Null hypothesis probability = 2.796391e-308
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.567e-06 5.110e-08
25- 50 6.879e-06 1.470e-07
50-150 1.387e-05 2.445e-07
15-150 2.231e-05 2.867e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 117.145 ( )
Norm : 49.0166 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 144.98 using 59 PHA bins.
# Reduced chi-squared = 2.5435 for 57 degrees of freedom
# Null hypothesis probability = 1.314105e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.698e-06 2.040e-07
25- 50 8.368e-06 2.647e-07
50-150 1.476e-05 2.724e-06
15-150 2.782e-05 2.819e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.17215 (-0.29172 0.300952)
R1^2/D10^2 : 14.7977 (-2.29042 2.79472)
kT2 [keV] : 26.2543 (-0.943512 1.03951)
R2^2/D10^2 : 0.106271 (-0.0153498 0.0170241)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.79 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 55 degrees of freedom
# Null hypothesis probability = 4.081206e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.062e-06 2.481e-07
25- 50 9.258e-06 1.967e-07
50-150 1.461e-05 2.849e-07
15-150 2.893e-05 4.779e-07
Peak spectrum fit
Power-law model
Time interval is from 12.612 sec. to 13.612 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87898 ( -0.0310344 0.0310362 )
Norm@50keV : 0.925113 ( -0.0147608 0.0147548 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.74 using 59 PHA bins.
# Reduced chi-squared = 0.7499 for 57 degrees of freedom
# Null hypothesis probability = 9.196350e-01
Photon flux (15-150 keV) in 1 sec: 131.594 ( -2.8529 2.87156 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.5045e-06 ( -1.35625e-07 1.35655e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 12.612 sec. to 13.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85965 ( -0.119849 0.0479548 )
Epeak [keV] : 429.637 ( )
Norm@50keV : 0.942785 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.66 using 59 PHA bins.
# Reduced chi-squared = 0.7619 for 56 degrees of freedom
# Null hypothesis probability = 9.053200e-01
Photon flux (15-150 keV) in 1 sec: 130.517 131.507 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.20564e-11 ( 0 0 ) ergs/cm2
Band function
Time interval is from 12.612 sec. to 13.612 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.805055 ( -4.75975 -1.87179 )
beta : -1.89234 ( -0.0342538 0.0336286 )
Epeak [keV] : 25.7067 ( -5.8612 11.7167 )
Norm@50keV : 92.1892 ( -92.1425 98396 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.15 using 59 PHA bins.
# Reduced chi-squared = 0.7118 for 55 degrees of freedom
# Null hypothesis probability = 9.475724e-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] : 16.2193 ( )
R^2/D10^2 : 9.09228 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1163.56 using 59 PHA bins.
# Reduced chi-squared = 20.4133 for 57 degrees of freedom
# Null hypothesis probability = 4.262502e-206
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.930e-07 1.685e-08
25- 50 2.099e-06 5.450e-08
50-150 3.879e-06 9.850e-08
15-150 6.471e-06 1.080e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 122.287 (-10.4058 6.6534)
Norm : 517.604 (-11.5967 19.651)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.88 using 59 PHA bins.
# Reduced chi-squared = 1.717 for 57 degrees of freedom
# Null hypothesis probability = 6.158869e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.347e-06 6.300e-08
25- 50 2.418e-06 8.200e-08
50-150 4.355e-06 8.320e-07
15-150 8.120e-06 8.495e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.17193 (-0.353672 0.368026)
R1^2/D10^2 : 147.065 (-26.2523 33.171)
kT2 [keV] : 27.1008 (-1.28881 1.4625)
R2^2/D10^2 : 1.04901 (-0.192516 0.22034)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.52 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 55 degrees of freedom
# Null hypothesis probability = 3.821094e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.373e-06 8.000e-08
25- 50 2.542e-06 7.000e-08
50-150 4.372e-06 1.205e-07
15-150 8.288e-06 1.820e-07
Plot creation:
Sun Jul 29 18:55:39 EDT 2018