batgrbproduct analysis for trigger=769177
batgrbproduct Analysis for Trigger=769177
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): Thu Aug 24 13:44:44 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger769177/GCN5_download_cron
======================================================================
Trigger: 00769177 Segment: 000
BAT Trigger Time: 525219427.904 [s; MET]
Trigger Stop: 525219428.416 [s; MET]
UTC: 2017-08-23T22:16:48.329780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 188.719342821074 Dec: 35.5820017497756 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.42
Image Trigger?: NO
Rate S/N Ratio: 15.9687194226713 [ if not an image trigger ]
Image S/N Ratio: 9.42
Flight Position: [ source = BAT ]
RA: 188.719342821074 Dec: 35.5820017497756 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 188.712987452679 Dec: 35.5494567670078 [deg; J2000]
{ 12h 34m 51.1s , +35d 32' 58.0" }
+/- 0.858015083522454 [arcmin] (estimated 90% radius based on SNR)
+/- 0.320938177654606 [arcmin] (formal 1-sigma fit error)
SNR: 37.8552077017041
Angular difference between Flight and Ground position is 1.977182 arcmin
Partial Coding Fraction: 0.796875 [ including projection effects ]
Duration
T90: 69.4359999895096 +/- 11.6664311720294
Measured from: 1.67200011014938
to: 71.108000099659 [s; relative to TRIGTIME]
T50: 39.5159999728203 +/- 9.65179777233429
Measured from: 11.2080001235008
to: 50.7240000963211 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 21.3960000276566
to: 22.3960000276566 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.356000006198883
to: 87.3080000281334 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.840716 1.919507 0.960438 0.119212
0.062796 0.065050 0.055740 0.048844 [error]
Peak 0.124809 0.164675 0.120636 0.030140
0.008690 0.009513 0.008388 0.006277 [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 6.17e-07 8.05e-07 7.71e-07 1.31e-06 2.63e-06 3.50e-06 erg/cm2
Error 4.35e-08 3.50e-08 5.65e-08 1.98e-07 1.27e-07 2.51e-07 erg/cm2
Peak flux Power-law 1.27e+00 1.24e+00 8.48e-01 9.07e-01 3.73e+00 4.27e+00 ph/cm2/s
Error 1.38e-01 8.30e-02 7.04e-02 1.54e-01 2.40e-01 2.73e-01 ph/cm2/s
Fluence Cutoff-PL 5.88e-07 8.34e-07 7.62e-07 7.09e-07 2.53e-06 2.89e-06 erg/cm2
Error 5.08e-08 4.40e-08 6.09e-08 4.22e-07 1.56e-07 4.59e-07 erg/cm2
Peak flux Cutoff-PL 1.24e+00 1.27e+00 8.60e-01 7.32e-01 3.70e+00 4.09e+00 ph/cm2/s
Error 1.62e-01 9.79e-02 7.73e-02 2.41e-01 2.48e-01 4.04e-01 ph/cm2/s
Fluence Band 5.62e-07 8.43e-07 7.40e-07 1.10e-06 2.54e-06 3.25e-06 erg/cm2
Error 5.60e-08 -------- 6.22e-08 -------- 1.41e-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 2.064 0.089 - - 3.24e-03 1.68e-04 57.490 57
CPL 1.699 0.347 36.1 0.0 5.13e-03 0.00e+00 54.210 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.553 0.111 - - 2.94e-02 1.93e-03 48.170 57
CPL 1.378 0.345 176.9 0.0 3.62e-02 1.66e-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: 53.824000 sec.
T50 in the 50-300 keV band: 16.960000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 87.664 -0.356 87.308
T90 69.436 1.672 71.108
T50 39.516 11.208 50.724
Peak 1.000 21.396 22.396
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
188.7130 +35.5495 0.0051 24.1 -138.0 5.1779 37.9 TRIG_00769177
------------------------------------------
Foreground time interval of the image:
-0.356 87.308 (delta_t = 87.664 [sec])
Background time interval of the image:
-216.503 -0.356 (delta_t = 216.147 [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 -0.356 sec. to 87.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06396 ( -0.0879439 0.0895857 )
Norm@50keV : 3.23722E-03 ( -0.000169193 0.000167618 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.49 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.568791e-01
Photon flux (15-150 keV) in 87.66 sec: 0.500428 ( -0.0227744 0.0228309 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62813e-06 ( -1.26814e-07 1.27683e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.356 sec. to 87.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69939 ( -0.377975 0.315044 )
Epeak [keV] : 36.1007 ( )
Norm@50keV : 5.13364E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.21 using 59 PHA bins.
# Reduced chi-squared = 0.9680 for 56 degrees of freedom
# Null hypothesis probability = 5.429206e-01
Photon flux (15-150 keV) in 87.66 sec: 0.488610 ( -0.025144 0.025194 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.52825e-06 ( -1.55614e-07 1.57315e-07 ) ergs/cm2
Band function
Time interval is from -0.356 sec. to 87.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.69969 ( -0.296117 0.282871 )
beta : -9.36856 ( 9.37161 19.3716 )
Epeak [keV] : 36.1023 ( -9.33903 12.2651 )
Norm@50keV : 5.12984E-03 ( -0.00166056 0.000497163 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.21 using 59 PHA bins.
# Reduced chi-squared = 0.9856 for 55 degrees of freedom
# Null hypothesis probability = 5.048213e-01
Photon flux (15-150 keV) in 87.66 sec: 0.489024 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.53969e-06 ( -2.53907e-06 -1.40554e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.1910 ( )
R^2/D10^2 : 0.202039 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 160.21 using 59 PHA bins.
# Reduced chi-squared = 2.8108 for 57 degrees of freedom
# Null hypothesis probability = 9.568858e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.769e-07 2.937e-08
25- 50 9.623e-07 4.427e-08
50-150 5.304e-07 6.035e-08
15-150 1.870e-06 9.029e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 63.9122 (-8.37455 10.4048)
Norm : 2.48651 (-0.198434 0.220546)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.88 using 59 PHA bins.
# Reduced chi-squared = 0.9979 for 57 degrees of freedom
# Null hypothesis probability = 4.795327e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.530e-07 3.585e-08
25- 50 8.577e-07 3.857e-08
50-150 1.027e-06 1.144e-07
15-150 2.438e-06 1.249e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.99367 (-0.712807 0.747703)
R1^2/D10^2 : 1.17964 (-0.413828 0.730982)
kT2 [keV] : 20.3225 (-2.94268 4.14796)
R2^2/D10^2 : 9.84615E-03 (-0.00510576 0.00887819)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.33 using 59 PHA bins.
# Reduced chi-squared = 0.9333 for 55 degrees of freedom
# Null hypothesis probability = 6.155332e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.611e-07 7.219e-08
25- 50 8.340e-07 1.063e-07
50-150 1.099e-06 2.826e-07
15-150 2.494e-06 3.717e-07
Peak spectrum fit
Power-law model
Time interval is from 21.396 sec. to 22.396 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55295 ( -0.110829 0.112094 )
Norm@50keV : 2.94402E-02 ( -0.00193168 0.00192229 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.17 using 59 PHA bins.
# Reduced chi-squared = 0.8451 for 57 degrees of freedom
# Null hypothesis probability = 7.912352e-01
Photon flux (15-150 keV) in 1 sec: 3.73014 ( -0.239885 0.240106 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.77037e-07 ( -1.97377e-08 1.98531e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 21.396 sec. to 22.396 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37763 ( -0.454691 0.236218 )
Epeak [keV] : 176.917 ( -176.936 -176.936 )
Norm@50keV : 3.61789E-02 ( -0.00840923 0.0248205 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.66 using 59 PHA bins.
# Reduced chi-squared = 0.8511 for 56 degrees of freedom
# Null hypothesis probability = 7.784070e-01
Photon flux (15-150 keV) in 1 sec: 3.70207 ( -0.24875 0.24805 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.73642e-07 ( -2.1671e-08 2.0558e-08 ) ergs/cm2
Band function
Time interval is from 21.396 sec. to 22.396 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06232 ( 1.07141 1.07141 )
beta : -1.69546 ( 1.69348 0.226597 )
Epeak [keV] : 79.2656 ( -81.4375 -81.4375 )
Norm@50keV : 5.57368E-02 ( -0.0256033 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.10 using 59 PHA bins.
# Reduced chi-squared = 0.8564 for 55 degrees of freedom
# Null hypothesis probability = 7.667410e-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] : 14.1511 (-1.12977 1.25427)
R^2/D10^2 : 0.511407 (-0.132831 0.176176)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 107.77 using 59 PHA bins.
# Reduced chi-squared = 1.8907 for 57 degrees of freedom
# Null hypothesis probability = 5.623306e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.161e-08 2.610e-09
25- 50 8.123e-08 6.235e-09
50-150 1.077e-07 1.505e-08
15-150 2.105e-07 1.635e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.344 (-53.4668 -199.351)
Norm : 15.1884 (-0.953507 0.954647)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.86 using 59 PHA bins.
# Reduced chi-squared = 0.8396 for 57 degrees of freedom
# Null hypothesis probability = 8.005910e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.782e-08 2.995e-09
25- 50 7.275e-08 5.300e-09
50-150 1.596e-07 3.470e-08
15-150 2.701e-07 4.615e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.82309 (-1.74003 1.74473)
R1^2/D10^2 : 2.86224 (-1.31966 3.59839)
kT2 [keV] : 30.4986 (-7.76107 17.0998)
R2^2/D10^2 : 2.58906E-02 (-0.0194019 0.049851)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.66 using 59 PHA bins.
# Reduced chi-squared = 0.9211 for 55 degrees of freedom
# Null hypothesis probability = 6.409235e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.487e-08 6.835e-09
25- 50 7.556e-08 1.239e-08
50-150 1.640e-07 7.384e-08
15-150 2.744e-07 8.050e-08
Plot creation:
Thu Aug 24 14:00:49 EDT 2017