batgrbproduct analysis for trigger=852625
batgrbproduct Analysis for Trigger=852625
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 Aug 11 13:43:26 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger852625/GCN5_download_cron
======================================================================
Trigger: 00852625 Segment: 000
BAT Trigger Time: 555588704 [s; MET]
Trigger Stop: 555588768 [s; MET]
UTC: 2018-08-10T10:11:22.595200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 144.435660197179 Dec: -42.7669318754979 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.07
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.07
Flight Position: [ source = BAT ]
RA: 144.435660197179 Dec: -42.7669318754979 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 144.445043258794 Dec: -42.8071700548254 [deg; J2000]
{ 09h 37m 46.8s , -42d 48' 25.8" }
+/- 3.5844932261842 [arcmin] (estimated 90% radius based on SNR)
+/- 1.79327773856963 [arcmin] (formal 1-sigma fit error)
SNR: 4.90996862667572
Angular difference between Flight and Ground position is 2.449389 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.202587 0.250080 0.089318 -0.037199
0.055678 0.057759 0.051826 0.049658 [error]
Peak 0.202587 0.250080 0.089318 -0.037199
0.055678 0.057759 0.051826 0.049658 [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 6.02e-08 8.59e-08 9.09e-08 1.78e-07 2.93e-07 4.18e-07 erg/cm2
Error 2.27e-08 2.60e-08 4.29e-08 1.95e-07 1.05e-07 2.17e-07 erg/cm2
Peak flux Power-law 3.06e-02 2.41e-02 1.28e-02 9.81e-03 7.19e-02 7.73e-02 ph/cm2/s
Error 1.17e-02 7.24e-03 5.84e-03 8.31e-03 2.15e-02 2.35e-02 ph/cm2/s
Fluence Cutoff-PL 5.43e-08 1.24e-07 4.52e-08 9.71e-10 2.25e-07 2.24e-07 erg/cm2
Error 2.56e-08 3.93e-08 5.71e-08 2.54e-08 8.64e-08 8.92e-08 erg/cm2
Peak flux Cutoff-PL 2.66e-02 3.49e-02 7.19e-03 8.60e-05 6.88e-02 6.88e-02 ph/cm2/s
Error 1.30e-02 1.11e-02 8.34e-03 1.84e-03 2.02e-02 2.02e-02 ph/cm2/s
Fluence Band 5.91e-08 1.16e-07 6.12e-08 4.27e-08 2.59e-07 2.80e-07 erg/cm2
Error 2.67e-08 3.79e-08 -------- -------- -------- -------- erg/cm2
Peak flux Band 2.70e-02 -------- 7.70e-03 2.09e-04 -------- 7.08e-02 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 1.920 0.484 - - 4.97e-04 1.81e-04 60.720 57
CPL -1.577 5.048 36.2 12.2 8.37e-02 7.54e+03 55.320 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.920 0.484 - - 4.97e-04 1.81e-04 60.720 57
CPL -1.577 5.048 36.2 12.2 8.37e-02 7.54e+03 55.320 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
144.4450 -42.8072 0.0390 27.5 0.7 0.5415 4.9 TRIG_00852625
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92027 ( -0.455223 0.512236 )
Norm@50keV : 4.96652E-04 ( -0.00018164 0.000180353 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.72 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 57 degrees of freedom
# Null hypothesis probability = 3.433603e-01
Photon flux (15-150 keV) in 64 sec: 7.18987E-02 ( -0.0215216 0.021526 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9262e-07 ( -1.01462e-07 1.0879e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.57701 ( -7.3434 2.75288 )
Epeak [keV] : 36.1623 ( -8.3572 15.9592 )
Norm@50keV : 8.36689E-02 ( -0.101058 15077.8 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.32 using 59 PHA bins.
# Reduced chi-squared = 0.9879 for 56 degrees of freedom
# Null hypothesis probability = 5.004703e-01
Photon flux (15-150 keV) in 64 sec: 6.87514E-02 ( -0.0199275 0.0204924 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24553e-07 ( -7.47917e-08 9.7913e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5.5474 -5 )
beta : -2.87214 ( 2.87214 0.88977 )
Epeak [keV] : 28.7595 ( -6.28979 7.42503 )
Norm@50keV : 39.4357 ( -10.7105 147.675 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.19 using 59 PHA bins.
# Reduced chi-squared = 0.9853 for 55 degrees of freedom
# Null hypothesis probability = 5.055022e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58523e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.26468 (-2.16357 2.96589)
R^2/D10^2 : 5.06588E-02 (-0.0335762 0.089432)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.43 using 59 PHA bins.
# Reduced chi-squared = 0.9725 for 57 degrees of freedom
# Null hypothesis probability = 5.340865e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.496e-08 3.325e-08
25- 50 1.222e-07 7.179e-08
50-150 5.089e-08 3.916e-08
15-150 2.280e-07 1.283e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 60.8668 (-30.5215 116.252)
Norm : 0.388570 (-0.142484 0.215508)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.46 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 57 degrees of freedom
# Null hypothesis probability = 4.214607e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.264e-08 3.654e-08
25- 50 9.576e-08 5.859e-08
50-150 1.103e-07 9.040e-08
15-150 2.687e-07 1.775e-07
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.39 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.36 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.35 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.34 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Reduced chi-squared = 1.006 for 55 degrees of freedom
# Reduced chi-squared = 1.006 for 55 degrees of freedom
# Null hypothesis probability = 4.598433e-01
# Null hypothesis probability = 4.608996e-01
# Null hypothesis probability = 4.614091e-01
# Null hypothesis probability = 4.619215e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.599e-08 1.964e-05
25- 50 1.201e-07 1.331e-04
50-150 5.614e-08 2.103e-03
15-150 2.323e-07 3.386e-03
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92027 ( -0.455223 0.512236 )
Norm@50keV : 4.96652E-04 ( -0.00018164 0.000180353 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.72 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 57 degrees of freedom
# Null hypothesis probability = 3.433603e-01
Photon flux (15-150 keV) in 64 sec: 7.18987E-02 ( -0.0215216 0.021526 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9262e-07 ( -1.01462e-07 1.0879e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.57701 ( -7.3434 2.75288 )
Epeak [keV] : 36.1623 ( -8.3572 15.9592 )
Norm@50keV : 8.36689E-02 ( -0.101058 15077.8 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.32 using 59 PHA bins.
# Reduced chi-squared = 0.9879 for 56 degrees of freedom
# Null hypothesis probability = 5.004703e-01
Photon flux (15-150 keV) in 64 sec: 6.87514E-02 ( -0.0199275 0.0204924 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24553e-07 ( -7.47917e-08 9.7913e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5.5474 -5 )
beta : -2.87214 ( 2.87214 0.88977 )
Epeak [keV] : 28.7595 ( -6.28979 7.42503 )
Norm@50keV : 39.4357 ( -10.7105 147.675 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.19 using 59 PHA bins.
# Reduced chi-squared = 0.9853 for 55 degrees of freedom
# Null hypothesis probability = 5.055022e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58523e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.26468 (-2.16357 2.96589)
R^2/D10^2 : 5.06588E-02 (-0.0335762 0.089432)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.43 using 59 PHA bins.
# Reduced chi-squared = 0.9725 for 57 degrees of freedom
# Null hypothesis probability = 5.340865e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.496e-08 3.144e-08
25- 50 1.222e-07 7.347e-08
50-150 5.089e-08 3.856e-08
15-150 2.280e-07 1.377e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 60.8668 (-30.5215 116.252)
Norm : 0.388570 (-0.142484 0.215508)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.46 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 57 degrees of freedom
# Null hypothesis probability = 4.214607e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.264e-08 3.766e-08
25- 50 9.576e-08 5.763e-08
50-150 1.103e-07 8.875e-08
15-150 2.687e-07 1.770e-07
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.39 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.36 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.35 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.34 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Reduced chi-squared = 1.006 for 55 degrees of freedom
# Reduced chi-squared = 1.006 for 55 degrees of freedom
# Null hypothesis probability = 4.598433e-01
# Null hypothesis probability = 4.608996e-01
# Null hypothesis probability = 4.614091e-01
# Null hypothesis probability = 4.619215e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.599e-08 1.733e-05
25- 50 1.201e-07 1.321e-04
50-150 5.614e-08 2.852e-03
15-150 2.323e-07 2.530e-03
Plot creation:
Sat Aug 11 13:47:36 EDT 2018