batgrbproduct analysis for trigger=848621
batgrbproduct Analysis for Trigger=848621
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 Jul 19 19:59:32 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger848621/GCN5_download_cron
======================================================================
Trigger: 00848621 Segment: 000
BAT Trigger Time: 553643696 [s; MET]
Trigger Stop: 553643760 [s; MET]
UTC: 2018-07-18T21:54:34.714360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 190.39528288158 Dec: 11.7980569737009 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.86
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.86
Flight Position: [ source = BAT ]
RA: 190.39528288158 Dec: 11.7980569737009 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 190.361904276193 Dec: 11.8047785294958 [deg; J2000]
{ 12h 41m 26.9s , +11d 48' 17.2" }
+/- 5.99551226331118 [arcmin] (estimated 90% radius based on SNR)
+/- 5.58973432820364 [arcmin] (formal 1-sigma fit error)
SNR: 2.35471287083981
Angular difference between Flight and Ground position is 2.001437 arcmin
Partial Coding Fraction: 0.7578125 [ 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 0.196976 0.172988 -0.051346 -0.064456
0.060077 0.060251 0.053393 0.049066 [error]
Peak 0.196976 0.172988 -0.051346 -0.064456
0.060077 0.060251 0.053393 0.049066 [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 6.19e-08 4.88e-08 2.58e-08 1.97e-08 1.46e-07 1.51e-07 erg/cm2
Error 2.82e-08 2.89e-08 3.05e-08 4.63e-08 8.17e-08 1.06e-07 erg/cm2
Peak flux Power-law 3.22e-02 1.41e-02 3.71e-03 1.20e-03 5.08e-02 5.12e-02 ph/cm2/s
Error 1.49e-02 8.12e-03 4.33e-03 2.62e-03 2.26e-02 2.29e-02 ph/cm2/s
Fluence Cutoff-PL 6.05e-08 6.92e-08 1.14e-08 9.12e-11 1.41e-07 1.41e-07 erg/cm2
Error 3.19e-08 5.68e-08 2.48e-08 1.51e-08 6.68e-08 6.69e-08 erg/cm2
Peak flux Cutoff-PL 3.04e-02 2.04e-02 1.87e-03 8.71e-06 5.26e-02 5.28e-02 ph/cm2/s
Error 2.36e-02 1.65e-02 3.69e-03 7.90e-04 2.17e-02 2.17e-02 ph/cm2/s
Fluence Band 5.95e-08 7.00e-08 1.43e-08 2.37e-10 1.44e-07 1.41e-07 erg/cm2
Error 3.12e-08 5.69e-08 -------- -------- -------- -------- 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 2.949 1.067 - - 1.91e-04 1.89e-04 65.650 57
CPL -0.326 0.000 23.3 0.0 3.00e-02 0.00e+00 63.600 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.949 1.067 - - 1.91e-04 1.89e-04 65.650 57
CPL -0.326 0.000 23.3 0.0 3.00e-02 0.00e+00 63.600 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
190.3619 +11.8048 0.0817 34.6 -11.0 0.2734 2.4 TRIG_00848621
------------------------------------------
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: 2.94871 ( -0.812562 1.32066 )
Norm@50keV : 1.91102E-04 ( -0.0001924 0.000184858 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.65 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 57 degrees of freedom
# Null hypothesis probability = 2.021685e-01
Photon flux (15-150 keV) in 64 sec: 5.07649E-02 ( -0.022478 0.0227838 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45507e-07 ( -7.33933e-08 9.008e-08 ) 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: -0.326441 ( )
Epeak [keV] : 23.2779 ( )
Norm@50keV : 3.00138E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.60 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 56 degrees of freedom
# Null hypothesis probability = 2.266149e-01
Photon flux (15-150 keV) in 64 sec: 5.26369E-02 ( -0.0214996 0.0218238 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4148e-07 ( -6.27616e-08 7.08416e-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 : 0.682025 ( -2.28564 -0.286611 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 24.5494 ( -12.2934 12.3106 )
Norm@50keV : 4.87781E-02 ( -0.0495729 104.181 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.58 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 55 degrees of freedom
# Null hypothesis probability = 2.000305e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.04479e-18 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.59651 (-2.41192 2.93052)
R^2/D10^2 : 0.140246 (-0.140247 0.860813)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.58 using 59 PHA bins.
# Reduced chi-squared = 1.115 for 57 degrees of freedom
# Null hypothesis probability = 2.558412e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.875e-08 3.549e-08
25- 50 7.151e-08 4.733e-08
50-150 9.513e-09 8.598e-09
15-150 1.398e-07 9.805e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.3808 (-11.453 28.0381)
Norm : 0.607521 (-0.359027 1.18042)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.15 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 57 degrees of freedom
# Null hypothesis probability = 2.402885e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.368e-08 3.914e-08
25- 50 5.863e-08 3.923e-08
50-150 1.960e-08 1.973e-08
15-150 1.419e-07 1.017e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.50101 (-3.41654 -3.41654)
R1^2/D10^2 : 0.633564 (-0.759198 -0.759198)
kT2 [keV] : 7.48934 (-7.382 -7.382)
R2^2/D10^2 : 6.77544E-02 (-0.0760284 0.864947)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.48 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 55 degrees of freedom
# Null hypothesis probability = 2.024695e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.030e-08 4.320e-08
25- 50 6.937e-08 5.427e-08
50-150 1.366e-08 8.269e-09
15-150 1.433e-07 1.212e-07
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: 2.94871 ( -0.812562 1.32066 )
Norm@50keV : 1.91102E-04 ( -0.0001924 0.000184858 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.65 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 57 degrees of freedom
# Null hypothesis probability = 2.021685e-01
Photon flux (15-150 keV) in 64 sec: 5.07649E-02 ( -0.022478 0.0227838 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45507e-07 ( -7.33933e-08 9.008e-08 ) 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: -0.326441 ( )
Epeak [keV] : 23.2779 ( )
Norm@50keV : 3.00138E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.60 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 56 degrees of freedom
# Null hypothesis probability = 2.266149e-01
Photon flux (15-150 keV) in 64 sec: 5.26369E-02 ( -0.0214996 0.0218238 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4148e-07 ( -6.27616e-08 7.08416e-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 : 0.682025 ( -2.28212 -0.286611 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 24.5494 ( -12.2934 12.3106 )
Norm@50keV : 4.87781E-02 ( -0.0495729 104.181 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.58 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 55 degrees of freedom
# Null hypothesis probability = 2.000305e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.04479e-18 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.59651 (-2.41192 2.93052)
R^2/D10^2 : 0.140246 (-0.140247 0.860813)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.58 using 59 PHA bins.
# Reduced chi-squared = 1.115 for 57 degrees of freedom
# Null hypothesis probability = 2.558412e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.875e-08 3.670e-08
25- 50 7.151e-08 4.790e-08
50-150 9.513e-09 8.637e-09
15-150 1.398e-07 8.614e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.3808 (-11.453 28.0381)
Norm : 0.607521 (-0.359027 1.18042)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.15 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 57 degrees of freedom
# Null hypothesis probability = 2.402885e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.368e-08 3.971e-08
25- 50 5.863e-08 3.962e-08
50-150 1.960e-08 1.838e-08
15-150 1.419e-07 9.485e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.50101 (-3.41654 -3.41654)
R1^2/D10^2 : 0.633564 (-0.759198 -0.759198)
kT2 [keV] : 7.48934 (-7.382 -7.382)
R2^2/D10^2 : 6.77544E-02 (-0.0760284 0.864947)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.48 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 55 degrees of freedom
# Null hypothesis probability = 2.024695e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.030e-08 4.371e-08
25- 50 6.937e-08 3.818e-08
50-150 1.366e-08 1.136e-08
15-150 1.433e-07 9.974e-08
Plot creation:
Thu Jul 19 20:03:10 EDT 2018