batgrbproduct analysis for trigger=854578
batgrbproduct Analysis for Trigger=854578
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): Wed Aug 22 17:56:31 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger854578/GCN5_download_cron
======================================================================
Trigger: 00854578 Segment: 000
BAT Trigger Time: 556562456 [s; MET]
Trigger Stop: 556562576 [s; MET]
UTC: 2018-08-21T16:40:34.535440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 7.76306090448872 Dec: -38.6188964142254 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.81
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.81
Flight Position: [ source = BAT ]
RA: 7.76306090448872 Dec: -38.6188964142254 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 7.73946182081908 Dec: -38.6116503652198 [deg; J2000]
{ 00h 30m 57.5s , -38d 36' 41.9" }
+/- 2.32422064565329 [arcmin] (estimated 90% radius based on SNR)
+/- 1.16962344543973 [arcmin] (formal 1-sigma fit error)
SNR: 9.11727419835991
Angular difference between Flight and Ground position is 1.188713 arcmin
Partial Coding Fraction: 0.1757812 [ including projection effects ]
Duration
T90: 64 +/- 22.6274169979695
Measured from: 1.00000011920929
to: 65.0000001192093 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: 17.0000001192093
to: 49.0000001192093 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 56.5
to: 57.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1
to: 65 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.672748 0.675941 0.625552 -0.019488
0.120082 0.124042 0.107381 0.089560 [error]
Peak 0.007585 0.021611 0.029264 -0.014046
0.013926 0.015070 0.014623 0.011098 [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 2.40e-07 3.69e-07 4.28e-07 9.53e-07 1.32e-06 1.99e-06 erg/cm2
Error 6.48e-08 6.33e-08 1.09e-07 5.07e-07 2.54e-07 6.05e-07 erg/cm2
Peak flux Power-law 1.29e-01 8.09e-02 3.28e-02 1.79e-02 2.51e-01 2.60e-01 ph/cm2/s
Error 1.85e-01 1.03e-01 5.20e-02 9.02e-02 3.19e-01 3.30e-01 ph/cm2/s
Fluence Cutoff-PL 2.40e-07 3.70e-07 4.28e-07 8.60e-07 1.32e-06 1.84e-06 erg/cm2
Error 6.98e-08 6.27e-08 1.13e-07 5.25e-07 2.59e-07 7.34e-07 erg/cm2
Peak flux Cutoff-PL 2.69e-03 8.69e-02 1.64e-01 5.93e-03 2.60e-01 2.60e-01 ph/cm2/s
Error 1.08e-01 1.55e-01 1.59e-01 2.19e-02 3.06e-01 3.07e-01 ph/cm2/s
Fluence Band 2.35e-07 3.75e-07 4.36e-07 8.30e-07 1.33e-06 1.88e-06 erg/cm2
Error -------- -------- 1.13e-07 -------- -------- -------- erg/cm2
Peak flux Band 6.35e-02 1.55e-01 1.04e-01 1.05e-02 3.31e-01 3.32e-01 ph/cm2/s
Error 1.40e-01 1.63e-01 1.35e-01 -------- 3.24e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.788 0.315 - - 2.24e-03 4.21e-04 56.770 57
CPL 1.792 0.618 9999.4 -0.0 2.23e-03 4.72e-03 56.770 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.313 0.000 - - 1.43e-03 2.00e-03 68.840 57
CPL -9.977 0.942 64.7 25.4 6.21e+01 1.97e+05 66.120 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: 43.008000 sec.
T50 in the 50-300 keV band: 23.936000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 1.000 65.000
T90 64.000 1.000 65.000
T50 32.000 17.000 49.000
Peak 1.000 56.500 57.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
7.7395 -38.6117 0.0212 44.8 32.6 2.3456 9.1 TRIG_00854578
------------------------------------------
Foreground time interval of the image:
1.000 65.000 (delta_t = 64.000 [sec])
Background time interval of the image:
-239.000 1.000 (delta_t = 240.000 [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 1.000 sec. to 65.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78774 ( -0.304966 0.326004 )
Norm@50keV : 2.23633E-03 ( -0.00042765 0.000413999 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.77 using 59 PHA bins.
# Reduced chi-squared = 0.9960 for 57 degrees of freedom
# Null hypothesis probability = 4.836908e-01
Photon flux (15-150 keV) in 64 sec: 0.306709 ( -0.0532092 0.0533469 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31823e-06 ( -2.52716e-07 2.56116e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.000 sec. to 65.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79235 ( -0.886668 0.349687 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 2.22594E-03 ( -0.00223744 0.00721153 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.77 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 56 degrees of freedom
# Null hypothesis probability = 4.460574e-01
Photon flux (15-150 keV) in 64 sec: 0.306703 ( -0.053302 0.052957 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31753e-06 ( -2.62342e-07 2.55322e-07 ) ergs/cm2
Band function
Time interval is from 1.000 sec. to 65.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.89412 ( 2.89412 2.89412 )
beta : -1.78774 ( -0.326003 0.304967 )
Epeak [keV] : 80.1422 ( -80.1422 -80.1422 )
Norm@50keV : 0.303949 ( -0.0581237 0.0562687 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.77 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Null hypothesis probability = 4.088952e-01
Photon flux (15-150 keV) in 64 sec: 0.309664 ( 6.69034 -0.309664 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32881e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.9200 (-2.87075 3.47067)
R^2/D10^2 : 4.22629E-02 (-0.0234732 0.0554916)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.41 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 57 degrees of freedom
# Null hypothesis probability = 1.432061e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.108e-07 4.084e-08
25- 50 4.096e-07 1.235e-07
50-150 5.211e-07 2.064e-07
15-150 1.041e-06 2.988e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 126.071 (-60.4045 -123.755)
Norm : 1.26839 (-0.252321 0.379781)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.38 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 57 degrees of freedom
# Null hypothesis probability = 4.608287e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.110e-07 1.155e-07
25- 50 3.806e-07 1.923e-07
50-150 6.956e-07 4.515e-07
15-150 1.287e-06 7.608e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.80737 (-1.70312 2.56786)
R1^2/D10^2 : 4.44728 (-3.94596 148.745)
kT2 [keV] : 18.9010 (-4.52474 8.21467)
R2^2/D10^2 : 1.20871E-02 (-0.00897909 0.02221)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.45 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Null hypothesis probability = 4.574610e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.572e-07 1.386e-07
25- 50 3.242e-07 1.449e-07
50-150 6.845e-07 4.025e-07
15-150 1.266e-06 5.676e-07
Peak spectrum fit
Power-law model
Time interval is from 56.500 sec. to 57.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.31307 ( -2.30636 -2.30636 )
Norm@50keV : 1.43307E-03 ( -0.00143457 0.00257052 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.84 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 57 degrees of freedom
# Null hypothesis probability = 1.352584e-01
Photon flux (15-150 keV) in 1 sec: 0.251484 ( -0.251484 0.387015 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37283e-08 ( -1.37283e-08 2.31648e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 56.500 sec. to 57.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.97733 ( 9.98872 11.8718 )
Epeak [keV] : 64.6674 ( -28.433 22.3906 )
Norm@50keV : 62.0637 ( -62.0106 394034 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.12 using 59 PHA bins.
# Reduced chi-squared = 1.181 for 56 degrees of freedom
# Null hypothesis probability = 1.670002e-01
Photon flux (15-150 keV) in 1 sec: 0.259826 0.257047 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.92721e-16 ( 0 0 ) ergs/cm2
Band function
Time interval is from 56.500 sec. to 57.500 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -6.91778 -4.92881 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 61.0191 ( -34.8029 28.2313 )
Norm@50keV : 1.75228 ( -1.75306 265.397 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.42 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 55 degrees of freedom
# Null hypothesis probability = 1.392495e-01
Photon flux (15-150 keV) in 1 sec: 0.331464 ( 6.66854 -0.331464 ) 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] : 14.0824 (-5.91413 12.5849)
R^2/D10^2 : 5.87952E-02 (-0.0589301 2.0572)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.91 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 57 degrees of freedom
# Null hypothesis probability = 1.733994e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.462e-09 1.929e-09
25- 50 9.209e-09 6.335e-09
50-150 1.206e-08 1.174e-08
15-150 2.373e-08 1.979e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 53.4048 (-53.4048 -53.4048)
Norm : 1.73461 (-1.73461 -1.73461)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.24 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 57 degrees of freedom
# Null hypothesis probability = 1.464438e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.302e-09 3.598e-09
25- 50 6.321e-09 5.355e-09
50-150 6.522e-09 9.670e-09
15-150 1.714e-08 1.685e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.761805 (-0.826409 -0.826409)
R1^2/D10^2 : 1.92145E+06 (-7.15167e+06 5.69619e+11)
kT2 [keV] : 13.4651 (-5.94862 11.9779)
R2^2/D10^2 : 6.87832E-02 (-0.0536253 1.20994)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.89 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 55 degrees of freedom
# Null hypothesis probability = 1.305721e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.669e-09 2.008e-09
25- 50 9.444e-09 7.570e-09
50-150 1.104e-08 1.197e-08
15-150 2.316e-08 1.908e-08
Plot creation:
Wed Aug 22 18:02:24 EDT 2018