batgrbproduct analysis for trigger=813772
batgrbproduct Analysis for Trigger=813772
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): Tue Mar 13 01:58:28 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger813772/GCN5_download_cron
======================================================================
Trigger: 00813772 Segment: 000
BAT Trigger Time: 542508616 [s; MET]
Trigger Stop: 542508680 [s; MET]
UTC: 2018-03-12T00:49:55.390580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 275.099800193325 Dec: 7.1762644238348 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.87
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.87
Flight Position: [ source = BAT ]
RA: 275.099800193325 Dec: 7.1762644238348 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 275.101785457558 Dec: 7.15077208078532 [deg; J2000]
{ 18h 20m 24.4s , +07d 09' 02.8" }
+/- 2.59909161215046 [arcmin] (estimated 90% radius based on SNR)
+/- 1.68763647980959 [arcmin] (formal 1-sigma fit error)
SNR: 7.77170150467825
Angular difference between Flight and Ground position is 1.534100 arcmin
Partial Coding Fraction: 1 [ 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 0.342682 0.308586 0.148902 0.069040
0.057779 0.054457 0.046073 0.039995 [error]
Peak 0.342682 0.308586 0.148902 0.069040
0.057779 0.054457 0.046073 0.039995 [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 -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
Fluence Cutoff-PL -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Cutoff-PL -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- 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 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL 0.491 2.152 35.4 0.0 6.71e-03 0.00e+00 75.930 56
The chi2 of BB fit is 77.83 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL 0.491 2.152 35.4 0.0 6.71e-03 0.00e+00 75.930 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
275.1018 +7.1508 0.0250 0.1 -74.9 0.8693 7.8 TRIG_00813772
------------------------------------------
Foreground time interval of the image:
0.000 56.000 (delta_t = 56.000 [sec])
57.000 64.000 (delta_t = 7.000 [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 56.000000
57.000000 64.000000
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 63 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 56.000000
57.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.491012 ( -2.65616 1.64688 )
Epeak [keV] : 35.3521 ( )
Norm@50keV : 6.71167E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.93 using 59 PHA bins.
# Reduced chi-squared = 1.356 for 56 degrees of freedom
# Null hypothesis probability = 3.931316e-02
Photon flux (15-150 keV) in 63 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 56.000000
57.000000 64.000000
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 63 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] : 8.77649 (-1.57496 1.91376)
R^2/D10^2 : 8.64159E-02 (-0.0467747 0.101389)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.83 using 59 PHA bins.
# Reduced chi-squared = 1.366 for 57 degrees of freedom
# Null hypothesis probability = 3.476985e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.055e-08 2.585e-08
25- 50 1.645e-07 5.078e-08
50-150 5.808e-08 2.875e-08
15-150 3.031e-07 8.710e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 55.5906 (-22.2135 53.608)
Norm : 0.599439 (-0.164881 0.231042)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.31 using 59 PHA bins.
# Reduced chi-squared = 1.339 for 57 degrees of freedom
# Null hypothesis probability = 4.473276e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.364e-08 2.441e-08
25- 50 1.391e-07 3.865e-08
50-150 1.483e-07 7.846e-08
15-150 3.811e-07 1.244e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.93353 (-2.61678 1.81821)
R1^2/D10^2 : 0.121178 (-0.0655049 0.300788)
kT2 [keV] : 199.352 (-199.363 -199.363)
R2^2/D10^2 : 8.10136E-06 (-6.40439e-06 6.21896e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.68 using 59 PHA bins.
# Reduced chi-squared = 1.340 for 55 degrees of freedom
# Null hypothesis probability = 4.710020e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.700e-08 4.099e-08
25- 50 1.545e-07 6.616e-08
50-150 1.732e-07 3.253e-08
15-150 4.147e-07 1.323e-07
Peak spectrum fit
Power-law model
Time interval is from 57.000 sec. to 64.000 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 63 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from 57.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.491012 ( -2.65616 1.64689 )
Epeak [keV] : 35.3521 ( )
Norm@50keV : 6.71167E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.93 using 59 PHA bins.
# Reduced chi-squared = 1.356 for 56 degrees of freedom
# Null hypothesis probability = 3.931316e-02
Photon flux (15-150 keV) in 63 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 57.000 sec. to 64.000 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 63 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] : 8.77649 (-1.57496 1.91376)
R^2/D10^2 : 8.64159E-02 (-0.0467747 0.101389)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.83 using 59 PHA bins.
# Reduced chi-squared = 1.366 for 57 degrees of freedom
# Null hypothesis probability = 3.476985e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.055e-08 2.776e-08
25- 50 1.645e-07 4.864e-08
50-150 5.808e-08 2.861e-08
15-150 3.031e-07 9.403e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 55.5906 (-22.2135 53.608)
Norm : 0.599439 (-0.164881 0.231042)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.31 using 59 PHA bins.
# Reduced chi-squared = 1.339 for 57 degrees of freedom
# Null hypothesis probability = 4.473276e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.364e-08 2.483e-08
25- 50 1.391e-07 3.856e-08
50-150 1.483e-07 8.271e-08
15-150 3.811e-07 1.231e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.93353 (-2.61678 1.81821)
R1^2/D10^2 : 0.121178 (-0.0655049 0.300788)
kT2 [keV] : 199.352 (-199.363 -199.363)
R2^2/D10^2 : 8.10136E-06 (-6.40439e-06 6.21896e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.68 using 59 PHA bins.
# Reduced chi-squared = 1.340 for 55 degrees of freedom
# Null hypothesis probability = 4.710020e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.700e-08 3.432e-08
25- 50 1.545e-07 7.020e-08
50-150 1.732e-07 3.737e-08
15-150 4.147e-07 1.351e-07
Plot creation:
Tue Mar 13 02:06:26 EDT 2018