batgrbproduct Analysis for Trigger=677890
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 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sun Mar 6 12:30:23 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger677890/GCN5_download_cron
======================================================================
Trigger: 00677890 Segment: 000
BAT Trigger Time: 478903368 [s; MET]
Trigger Stop: 478903432 [s; MET]
UTC: 2016-03-05T20:42:32.062940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 279.867546726903 Dec: 5.11261181512308 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.28
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.28
Flight Position: [ source = BAT ]
RA: 279.867546726903 Dec: 5.11261181512308 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 279.894623867564 Dec: 5.12710097714588 [deg; J2000]
{ 18h 39m 34.7s , +05d 07' 37.6" }
+/- 4.97037869707184 [arcmin] (estimated 90% radius based on SNR)
+/- 2.16845760748494 [arcmin] (formal 1-sigma fit error)
SNR: 3.07805422798075
Angular difference between Flight and Ground position is 1.836891 arcmin
Partial Coding Fraction: 0.671875 [ 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 0.175020 0.228186 0.021880 -0.000188
0.063608 0.057996 0.049486 0.046762 [error]
Peak 0.175020 0.228186 0.021880 -0.000188
0.063608 0.057996 0.049486 0.046762 [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 6.45e-08 7.42e-08 6.13e-08 8.50e-08 2.31e-07 2.85e-07 erg/cm2
Error 2.93e-08 2.85e-08 4.00e-08 1.22e-07 9.94e-08 1.69e-07 erg/cm2
Peak flux Power-law 3.30e-02 2.11e-02 8.72e-03 4.90e-03 6.53e-02 6.77e-02 ph/cm2/s
Error 1.53e-02 7.96e-03 5.51e-03 6.55e-03 2.39e-02 2.49e-02 ph/cm2/s
Fluence Cutoff-PL 5.74e-08 1.03e-07 2.38e-08 2.16e-10 1.84e-07 1.85e-07 erg/cm2
Error 3.31e-08 4.17e-08 4.05e-08 2.65e-08 6.58e-08 7.93e-08 erg/cm2
Peak flux Cutoff-PL 2.83e-02 2.96e-02 3.90e-03 1.94e-05 6.18e-02 6.18e-02 ph/cm2/s
Error 1.70e-02 1.16e-02 5.93e-03 1.73e-03 2.27e-02 2.27e-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 2.273 0.686 - - 3.79e-04 1.88e-04 45.440 57
CPL -1.566 0.948 31.1 0.0 1.22e-01 0.00e+00 42.270 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.273 0.686 - - 3.79e-04 1.88e-04 45.440 57
CPL -1.566 0.948 31.1 0.0 1.22e-01 0.00e+00 42.270 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
279.8946 +5.1271 0.0623 36.5 -162.1 0.3905 3.1 TRIG_00677890
------------------------------------------
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: 2.27305 ( -0.625177 0.746764 )
Norm@50keV : 3.79332E-04 ( -0.000187656 0.000188713 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.44 using 59 PHA bins.
# Reduced chi-squared = 0.7972 for 57 degrees of freedom
# Null hypothesis probability = 8.648242e-01
Photon flux (15-150 keV) in 64 sec: 6.53148E-02 ( -0.0239169 0.0239267 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30668e-07 ( -9.49946e-08 1.03822e-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: -1.56629 ( 1.61673 3.51239 )
Epeak [keV] : 31.0605 ( )
Norm@50keV : 0.122022 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.27 using 59 PHA bins.
# Reduced chi-squared = 0.7548 for 56 degrees of freedom
# Null hypothesis probability = 9.127082e-01
Photon flux (15-150 keV) in 64 sec: 6.17914E-02 ( -0.0224203 0.0230142 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.84494e-07 ( -6.91981e-08 6.23034e-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 : 4.95210 ( -9.57909 -4.9521 )
beta : -3.16857 ( 3.16857 1.10811 )
Epeak [keV] : 26.1023 ( -8.54304 9.29826 )
Norm@50keV : 63.6409 ( -21.6125 873.603 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.16 using 59 PHA bins.
# Reduced chi-squared = 0.7666 for 55 degrees of freedom
# Null hypothesis probability = 8.979263e-01
Photon flux (15-150 keV) in 64 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] : 7.97496 (-2.20076 2.99205)
R^2/D10^2 : 7.96229E-02 (-0.0796229 0.219155)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.29 using 59 PHA bins.
# Reduced chi-squared = 0.7420 for 57 degrees of freedom
# Null hypothesis probability = 9.270201e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.847e-08 3.696e-08
25- 50 1.018e-07 6.330e-08
50-150 2.645e-08 2.157e-08
15-150 1.867e-07 1.188e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.4352 (-18.5754 65.9308)
Norm : 0.466325 (-0.232737 0.470544)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.94 using 59 PHA bins.
# Reduced chi-squared = 0.7709 for 57 degrees of freedom
# Null hypothesis probability = 8.975284e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.626e-08 4.147e-08
25- 50 8.358e-08 4.938e-08
50-150 5.820e-08 5.008e-08
15-150 2.080e-07 1.405e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 1.30880E-06 (-1.30884e-06 -1.30884e-06)
kT2 [keV] : 7.83299 (-2.17617 3.06831)
R2^2/D10^2 : 8.45173E-02 (-0.0631263 0.207216)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.29 using 59 PHA bins.
#Fit statistic : Chi-Squared = 42.20 using 59 PHA bins.
# Reduced chi-squared = 0.7689 for 55 degrees of freedom
# Reduced chi-squared = 0.7673 for 55 degrees of freedom
# Null hypothesis probability = 8.952802e-01
# Null hypothesis probability = 8.970799e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.850e-08 1.365e-02
25- 50 1.018e-07 1.132e-01
50-150 2.654e-08 2.828e+00
15-150 1.868e-07 2.740e+00
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: 2.27305 ( -0.625177 0.746764 )
Norm@50keV : 3.79332E-04 ( -0.000187656 0.000188713 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.44 using 59 PHA bins.
# Reduced chi-squared = 0.7972 for 57 degrees of freedom
# Null hypothesis probability = 8.648242e-01
Photon flux (15-150 keV) in 64 sec: 6.53148E-02 ( -0.0239169 0.0239267 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30668e-07 ( -9.49946e-08 1.03822e-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: -1.56629 ( 1.61673 3.51239 )
Epeak [keV] : 31.0605 ( )
Norm@50keV : 0.122022 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.27 using 59 PHA bins.
# Reduced chi-squared = 0.7548 for 56 degrees of freedom
# Null hypothesis probability = 9.127082e-01
Photon flux (15-150 keV) in 64 sec: 6.17914E-02 ( -0.0224203 0.0230142 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.84494e-07 ( -6.91981e-08 6.23034e-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 : 4.95210 ( -6.67805 -4.9521 )
beta : -3.16857 ( 3.16857 1.10811 )
Epeak [keV] : 26.1023 ( -8.54304 9.29826 )
Norm@50keV : 63.6409 ( -21.6125 873.603 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.16 using 59 PHA bins.
# Reduced chi-squared = 0.7666 for 55 degrees of freedom
# Null hypothesis probability = 8.979263e-01
Photon flux (15-150 keV) in 64 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] : 7.97496 (-2.20076 2.99205)
R^2/D10^2 : 7.96229E-02 (-0.0796229 0.219155)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.29 using 59 PHA bins.
# Reduced chi-squared = 0.7420 for 57 degrees of freedom
# Null hypothesis probability = 9.270201e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.847e-08 3.818e-08
25- 50 1.018e-07 6.394e-08
50-150 2.645e-08 2.086e-08
15-150 1.867e-07 1.190e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.4352 (-18.5754 65.9308)
Norm : 0.466325 (-0.232737 0.470544)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.94 using 59 PHA bins.
# Reduced chi-squared = 0.7709 for 57 degrees of freedom
# Null hypothesis probability = 8.975284e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.626e-08 4.109e-08
25- 50 8.358e-08 5.462e-08
50-150 5.820e-08 4.941e-08
15-150 2.080e-07 1.389e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 1.30880E-06 (-1.30884e-06 -1.30884e-06)
kT2 [keV] : 7.83299 (-2.17617 3.06831)
R2^2/D10^2 : 8.45173E-02 (-0.0631263 0.207216)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.29 using 59 PHA bins.
#Fit statistic : Chi-Squared = 42.20 using 59 PHA bins.
# Reduced chi-squared = 0.7689 for 55 degrees of freedom
# Reduced chi-squared = 0.7673 for 55 degrees of freedom
# Null hypothesis probability = 8.952802e-01
# Null hypothesis probability = 8.970799e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.850e-08 1.548e-02
25- 50 1.018e-07 1.042e-01
50-150 2.654e-08 2.519e+00
15-150 1.868e-07 2.679e+00
Plot creation:
Sun Mar 6 12:36:04 EST 2016