batgrbproduct analysis for trigger=831888
batgrbproduct Analysis for Trigger=831888
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 May 12 09:31:34 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger831888/GCN5_download_cron
======================================================================
Trigger: 00831888 Segment: 000
BAT Trigger Time: 547715760 [s; MET]
Trigger Stop: 547716384 [s; MET]
UTC: 2018-05-11T07:15:39.075320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 214.508076499655 Dec: -62.4570554155501 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 11.22
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.22
Flight Position: [ source = BAT ]
RA: 214.508076499655 Dec: -62.4570554155501 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 214.586620197247 Dec: -62.3554094984748 [deg; J2000]
{ 14h 18m 20.8s , -62d 21' 19.5" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 10.1803853722492 [arcmin] (formal 1-sigma fit error)
SNR: -0.864526873111533
Angular difference between Flight and Ground position is 6.477637 arcmin
Partial Coding Fraction: 0.375 [ including projection effects ]
Duration
T90: 624 +/-
Measured from: 0
to: 624 [s; relative to TRIGTIME]
T50: 624 +/-
Measured from: 0
to: 624 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 624 second)
Measured from: 0
to: 624 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 624 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.016103 -0.111585 -0.023013 -0.166907
0.275017 0.283866 0.248464 0.231579 [error]
Peak 0.016103 -0.111585 -0.023013 -0.166907
0.275017 0.283866 0.248464 0.231579 [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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 6.83e-08 5.53e-08 7.54e-08 2.17e-06 2.05e-07 2.19e-06 erg/cm2
Peak flux Power-law 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 3.72e-03 1.61e-03 1.05e-03 8.30e-03 5.04e-03 6.43e-03 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 8.60e-08 1.03e-07 1.52e-07 -------- 2.19e-07 -------- erg/cm2
Peak flux Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 4.74e-03 2.82e-03 2.11e-03 -------- 5.04e-03 5.13e-03 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error -------- 8.68e-08 7.24e-08 -------- -------- -------- erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error -------- 2.47e-03 1.76e-03 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.500 0.000 - - 0.00e+00 3.40e-05 61.520 57
CPL 1.000 0.000 50.0 0.0 0.00e+00 0.00e+00 61.520 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.500 0.000 - - 0.00e+00 3.40e-05 61.520 57
CPL 1.000 0.000 50.0 0.0 0.00e+00 0.00e+00 61.520 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 624.000 0.000 624.000
T90 624.000 0.000 624.000
T50 624.000 0.000 624.000
Peak 624.000 0.000 624.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
214.5866 -62.3554 0.2224 41.3 169.5 -0.8555 -0.9 TRIG_00831888
------------------------------------------
Foreground time interval of the image:
0.000 435.360 (delta_t = 435.360 [sec])
436.000 624.000 (delta_t = 188.000 [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
Multiple GTIs in the spectrum
tstart tstop
0.000000 435.360000
436.000000 624.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -1.5 -1.5 )
Norm@50keV : 0.0 ( 0 6.79895e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.52 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 57 degrees of freedom
# Null hypothesis probability = 3.173810e-01
Photon flux (15-150 keV) in 623.4 sec: 0.0 ( 0 0.0100778 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 4.09012e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 435.360000
436.000000 624.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 0.0 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.52 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 56 degrees of freedom
# Null hypothesis probability = 2.849396e-01
Photon flux (15-150 keV) in 623.4 sec: 0.0 ( 0 0.0100813 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 4.37969e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 435.360000
436.000000 624.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.983950 ( 0.98395 0.98395 )
beta : -2.50000 ( 2.5 2.5 )
Epeak [keV] : 80.0000 ( -80 -80 )
Norm@50keV : 0.0 ( 0 1.52167e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.52 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 55 degrees of freedom
# Null hypothesis probability = 2.539907e-01
Photon flux (15-150 keV) in 623.4 sec: 0.0 ( ) 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] : 2.46790 (-5 -5)
R^2/D10^2 : 0.294387 (-0.387083 -0.387083)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.51 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 57 degrees of freedom
# Null hypothesis probability = 3.179406e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 2.81900 (-3.84311 -3.84311)
Norm : 1.03883 (-0.31569 -0.31569)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.52 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 57 degrees of freedom
# Null hypothesis probability = 3.176022e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.175e-09 0.000e+00
25- 50 1.259e-10 0.000e+00
50-150 1.344e-14 0.000e+00
15-150 5.301e-09 0.000e+00
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.09957 (-2.1062 -2.1062)
R1^2/D10^2 : 1.41108 (-1.22009 -1.22009)
kT2 [keV] : 10.0000 (-10 -10)
R2^2/D10^2 : 0.0 (0 0)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.52 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.50 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 55 degrees of freedom
# Reduced chi-squared = 1.118 for 55 degrees of freedom
# Null hypothesis probability = 2.539907e-01
# Null hypothesis probability = 2.545842e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 436.000 sec. to 624.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -1.5 -1.5 )
Norm@50keV : 0.0 ( 0 6.79895e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.52 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 57 degrees of freedom
# Null hypothesis probability = 3.173810e-01
Photon flux (15-150 keV) in 623.4 sec: 0.0 ( 0 0.0100778 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 4.09012e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 436.000 sec. to 624.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 0.0 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.52 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 56 degrees of freedom
# Null hypothesis probability = 2.849396e-01
Photon flux (15-150 keV) in 623.4 sec: 0.0 ( 0 0.0100813 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 4.37969e-07 ) ergs/cm2
Band function
Time interval is from 436.000 sec. to 624.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.983950 ( 0.98395 0.98395 )
beta : -2.50000 ( 2.5 2.5 )
Epeak [keV] : 80.0000 ( -80 -80 )
Norm@50keV : 0.0 ( 0 1.52167e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.52 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 55 degrees of freedom
# Null hypothesis probability = 2.539907e-01
Photon flux (15-150 keV) in 623.4 sec: 0.0 ( ) 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] : 2.46790 (-5 -5)
R^2/D10^2 : 0.294387 (-0.387083 -0.387083)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.51 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 57 degrees of freedom
# Null hypothesis probability = 3.179406e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 2.81900 (-3.84311 -3.84311)
Norm : 1.03883 (-0.31569 -0.31569)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.52 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 57 degrees of freedom
# Null hypothesis probability = 3.176022e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.175e-09 0.000e+00
25- 50 1.259e-10 0.000e+00
50-150 1.344e-14 0.000e+00
15-150 5.301e-09 0.000e+00
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.09957 (-2.1062 -2.1062)
R1^2/D10^2 : 1.41108 (-1.22009 -1.22009)
kT2 [keV] : 10.0000 (-10 -10)
R2^2/D10^2 : 0.0 (0 0)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.52 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.50 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 55 degrees of freedom
# Reduced chi-squared = 1.118 for 55 degrees of freedom
# Null hypothesis probability = 2.539907e-01
# Null hypothesis probability = 2.545842e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Sat May 12 09:37:37 EDT 2018