batgrbproduct analysis for trigger=885845
batgrbproduct Analysis for Trigger=885845
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 Jan 27 13:13:31 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger885845/GCN5_download_cron
======================================================================
Trigger: 00885845 Segment: 000
BAT Trigger Time: 570197376 [s; MET]
Trigger Stop: 570197464 [s; MET]
UTC: 2019-01-26T12:09:13.686920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 207.004268706186 Dec: -63.2702643390262 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 12.68
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.68
Flight Position: [ source = BAT ]
RA: 207.004268706186 Dec: -63.2702643390262 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 207.01837461681 Dec: -63.2729031497139 [deg; J2000]
{ 13h 48m 04.4s , -63d 16' 22.5" }
+/- 1.68589762746987 [arcmin] (estimated 90% radius based on SNR)
+/- 0.804832419612743 [arcmin] (formal 1-sigma fit error)
SNR: 14.423604629993
Angular difference between Flight and Ground position is 0.412272 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 88 +/-
Measured from: 0
to: 88 [s; relative to TRIGTIME]
T50: 88 +/-
Measured from: 0
to: 88 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 88 second)
Measured from: 0
to: 88 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 88 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.668169 0.751807 0.502113 0.098949
0.069108 0.068271 0.058912 0.054819 [error]
Peak 0.668169 0.751807 0.502113 0.098949
0.069108 0.068271 0.058912 0.054819 [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 1.79e-07 3.02e-07 3.89e-07 1.01e-06 1.15e-06 1.88e-06 erg/cm2
Error 2.92e-08 3.03e-08 5.76e-08 3.18e-07 1.34e-07 3.66e-07 erg/cm2
Peak flux Power-law 6.56e-02 6.10e-02 3.93e-02 3.90e-02 1.82e-01 2.05e-01 ph/cm2/s
Error 1.10e-02 6.21e-03 5.59e-03 1.14e-02 1.82e-02 2.06e-02 ph/cm2/s
Fluence Cutoff-PL 1.78e-07 3.03e-07 3.90e-07 1.01e-06 1.15e-06 1.86e-06 erg/cm2
Error 2.32e-08 2.40e-08 4.31e-08 6.12e-07 1.40e-07 5.24e-07 erg/cm2
Peak flux Cutoff-PL 6.58e-02 6.10e-02 3.92e-02 3.84e-02 1.82e-01 2.05e-01 ph/cm2/s
Error 1.13e-02 6.58e-03 5.63e-03 2.14e-02 1.82e-02 2.51e-02 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- 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 1.635 0.186 - - 1.40e-03 1.51e-04 57.880 57
CPL 1.639 0.187 9999.4 -0.0 1.40e-03 1.15e-03 57.880 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.635 0.186 - - 1.40e-03 1.51e-04 57.880 57
CPL 1.639 0.187 9999.4 -0.0 1.40e-03 1.15e-03 57.880 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 88.000 0.000 88.000
T90 88.000 0.000 88.000
T50 88.000 0.000 88.000
Peak 88.000 0.000 88.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
207.0184 -63.2729 0.0134 0.0 -136.5 2.0382 14.4 TRIG_00885845
------------------------------------------
Foreground time interval of the image:
0.000 88.000 (delta_t = 88.000 [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 88.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63490 ( -0.184538 0.188266 )
Norm@50keV : 1.40029E-03 ( -0.000152149 0.0001498 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.88 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 57 degrees of freedom
# Null hypothesis probability = 4.426547e-01
Photon flux (15-150 keV) in 88 sec: 0.181944 ( -0.0181727 0.0181952 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14782e-06 ( -1.33284e-07 1.35407e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 88.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63898 ( -0.189275 0.185666 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 1.39951E-03 ( -0.00072391 0.00158038 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.88 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 56 degrees of freedom
# Null hypothesis probability = 4.056154e-01
Photon flux (15-150 keV) in 88 sec: 0.181949 ( -0.018195 0.018113 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14838e-06 ( -1.46062e-07 1.33118e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 88.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47911 ( 1.47915 1.47915 )
beta : -1.63493 ( 1.63493 0.184609 )
Epeak [keV] : 40.1550 ( -39.9631 -39.9631 )
Norm@50keV : 2.04360E-03 ( -0.000782672 0.208635 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.88 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.695198e-01
Photon flux (15-150 keV) in 88 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] : 12.8568 (-1.68223 2.03713)
R^2/D10^2 : 3.34628E-02 (-0.0137231 0.0222451)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.22 using 59 PHA bins.
# Reduced chi-squared = 1.548 for 57 degrees of freedom
# Null hypothesis probability = 5.014712e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.032e-07 2.096e-08
25- 50 3.513e-07 4.880e-08
50-150 3.648e-07 8.624e-08
15-150 8.193e-07 1.088e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 162.310 (-63.4889 -162.184)
Norm : 0.742704 (-0.0801777 0.0968813)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.98 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 57 degrees of freedom
# Null hypothesis probability = 4.028032e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.667e-07 6.030e-08
25- 50 3.124e-07 1.642e-07
50-150 6.364e-07 3.542e-07
15-150 1.115e-06 5.511e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.72603 (-2.58963 2.29203)
R1^2/D10^2 : 0.243563 (-0.149728 1.27426)
kT2 [keV] : 27.4420 (-9.21291 24.7898)
R2^2/D10^2 : 1.81898E-03 (-0.00153402 0.0063261)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.64 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 55 degrees of freedom
# Null hypothesis probability = 2.796703e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.691e-07 6.537e-08
25- 50 3.069e-07 1.070e-07
50-150 6.736e-07 3.612e-07
15-150 1.149e-06 4.756e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 88.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63490 ( -0.184538 0.188266 )
Norm@50keV : 1.40029E-03 ( -0.000152149 0.0001498 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.88 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 57 degrees of freedom
# Null hypothesis probability = 4.426547e-01
Photon flux (15-150 keV) in 88 sec: 0.181944 ( -0.0181727 0.0181952 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14782e-06 ( -1.33284e-07 1.35407e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 88.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63898 ( -0.189275 0.185666 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 1.39951E-03 ( -0.00072391 0.00158038 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.88 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 56 degrees of freedom
# Null hypothesis probability = 4.056154e-01
Photon flux (15-150 keV) in 88 sec: 0.181949 ( -0.018195 0.018113 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14838e-06 ( -1.46062e-07 1.33118e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 88.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47911 ( 1.47915 1.47915 )
beta : -1.63493 ( 1.63493 0.184609 )
Epeak [keV] : 40.1550 ( -39.9631 -39.9631 )
Norm@50keV : 2.04360E-03 ( -0.000782672 0.208635 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.88 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.695198e-01
Photon flux (15-150 keV) in 88 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] : 12.8568 (-1.68223 2.03713)
R^2/D10^2 : 3.34628E-02 (-0.0137231 0.0222451)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.22 using 59 PHA bins.
# Reduced chi-squared = 1.548 for 57 degrees of freedom
# Null hypothesis probability = 5.014712e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.032e-07 1.958e-08
25- 50 3.513e-07 4.968e-08
50-150 3.648e-07 8.571e-08
15-150 8.193e-07 1.087e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 162.310 (-63.4889 -162.184)
Norm : 0.742704 (-0.0801777 0.0968813)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.98 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 57 degrees of freedom
# Null hypothesis probability = 4.028032e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.667e-07 6.305e-08
25- 50 3.124e-07 1.338e-07
50-150 6.364e-07 3.606e-07
15-150 1.115e-06 5.703e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.72603 (-2.58963 2.29203)
R1^2/D10^2 : 0.243563 (-0.149728 1.27426)
kT2 [keV] : 27.4420 (-9.21291 24.7898)
R2^2/D10^2 : 1.81898E-03 (-0.00153402 0.0063261)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.64 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 55 degrees of freedom
# Null hypothesis probability = 2.796703e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.691e-07 7.181e-08
25- 50 3.069e-07 1.082e-07
50-150 6.736e-07 3.603e-07
15-150 1.149e-06 4.566e-07
Plot creation:
Sun Jan 27 13:18:00 EST 2019