batgrbproduct Analysis for Trigger=687492
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): Thu May 26 10:07:19 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger687492/GCN5_download_cron
======================================================================
Trigger: 00687492 Segment: 000
BAT Trigger Time: 485832856 [s; MET]
Trigger Stop: 485832920 [s; MET]
UTC: 2016-05-25T01:33:59.682820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 103.530165020782 Dec: -0.17351014677238 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.19
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.19
Flight Position: [ source = BAT ]
RA: 103.530165020782 Dec: -0.17351014677238 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 103.57497660927 Dec: -0.197861959960937 [deg; J2000]
{ 06h 54m 18.0s , -00d 11' 52.3" }
+/- 3.3570391042627 [arcmin] (estimated 90% radius based on SNR)
+/- 1.73744980186646 [arcmin] (formal 1-sigma fit error)
SNR: 5.39202744535706
Angular difference between Flight and Ground position is 3.060040 arcmin
Partial Coding Fraction: 0.984375 [ 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 0.238997 0.209365 -0.018821 0.051345
0.045496 0.047019 0.041394 0.037601 [error]
Peak 0.238997 0.209365 -0.018821 0.051345
0.045496 0.047019 0.041394 0.037601 [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 6.59e-08 6.35e-08 4.27e-08 4.48e-08 1.90e-07 2.18e-07 erg/cm2
Error 1.82e-08 2.08e-08 2.62e-08 5.76e-08 6.69e-08 9.73e-08 erg/cm2
Peak flux Power-law 3.40e-02 1.83e-02 6.14e-03 2.68e-03 5.99e-02 6.11e-02 ph/cm2/s
Error 9.54e-03 5.78e-03 3.65e-03 3.25e-03 1.59e-02 1.66e-02 ph/cm2/s
Fluence Cutoff-PL 6.76e-08 8.49e-08 1.27e-08 6.39e-11 1.65e-07 1.65e-07 erg/cm2
Error 2.08e-08 3.13e-08 2.16e-08 3.17e-09 4.89e-08 4.89e-08 erg/cm2
Peak flux Cutoff-PL 3.37e-02 2.50e-02 2.11e-03 5.75e-06 6.09e-02 6.09e-02 ph/cm2/s
Error 1.09e-02 8.58e-03 3.29e-03 2.54e-04 1.49e-02 1.49e-02 ph/cm2/s
Fluence Band 6.69e-08 8.49e-08 1.75e-08 2.92e-10 1.68e-07 1.68e-07 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 2.579 0.540 - - 2.90e-04 1.36e-04 62.990 57
CPL -1.110 4.673 25.9 9.6 1.03e-01 7.45e+03 57.010 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.579 0.540 - - 2.90e-04 1.36e-04 62.990 57
CPL -1.110 4.673 25.9 9.6 1.03e-01 7.45e+03 57.010 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
103.5750 -0.1979 0.0357 10.9 -67.3 0.5065 5.4 TRIG_00687492
------------------------------------------
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: 2.57865 ( -0.478211 0.601542 )
Norm@50keV : 2.89941E-04 ( -0.00012996 0.000141383 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.99 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.726841e-01
Photon flux (15-150 keV) in 64 sec: 5.98564E-02 ( -0.0157979 0.0159515 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90207e-07 ( -6.28063e-08 7.10259e-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: -1.11000 ( -6.72604 2.61896 )
Epeak [keV] : 25.8523 ( -12.2347 6.90567 )
Norm@50keV : 0.103350 ( -0.123469 14903.5 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.01 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 56 degrees of freedom
# Null hypothesis probability = 4.372150e-01
Photon flux (15-150 keV) in 64 sec: 6.08769E-02 ( -0.0148027 0.0149005 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65324e-07 ( -4.65402e-08 5.1305e-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 : 1.25386 ( -2.17865 -1.27784 )
beta : -9.36964 ( 9.37124 19.3623 )
Epeak [keV] : 26.0185 ( -9.93795 6.72987 )
Norm@50keV : 0.129864 ( -0.148746 167.299 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.010366e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68284e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.72889 (-1.44799 1.71456)
R^2/D10^2 : 0.150921 (-0.0921233 0.258238)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 0.9999 for 57 degrees of freedom
# Null hypothesis probability = 4.752932e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.731e-08 3.949e-08
25- 50 8.528e-08 4.624e-08
50-150 1.222e-08 9.705e-09
15-150 1.648e-07 7.542e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 25.5672 (-9.97845 18.9062)
Norm : 0.582018 (-0.227602 0.407213)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.46 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.859983e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.920e-08 2.798e-08
25- 50 7.196e-08 4.016e-08
50-150 3.161e-08 2.712e-08
15-150 1.728e-07 8.932e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.28220 (-5.29685 -5.29685)
R1^2/D10^2 : 0.142318 (-0.126873 -0.126873)
kT2 [keV] : 7.53730 (-7.37278 191.488)
R2^2/D10^2 : 6.40108E-02 (-0.104639 -0.104639)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.011144e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.757e-08 6.586e-06
25- 50 8.362e-08 3.878e-05
50-150 1.465e-08 3.133e-04
15-150 1.658e-07 3.824e-04
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: 2.57865 ( -0.478211 0.601542 )
Norm@50keV : 2.89941E-04 ( -0.00012996 0.000141383 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.99 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.726841e-01
Photon flux (15-150 keV) in 64 sec: 5.98564E-02 ( -0.0157979 0.0159515 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90207e-07 ( -6.28063e-08 7.10259e-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: -1.11000 ( -6.72604 2.61896 )
Epeak [keV] : 25.8523 ( -12.2347 6.90567 )
Norm@50keV : 0.103350 ( -0.123469 14903.5 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.01 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 56 degrees of freedom
# Null hypothesis probability = 4.372150e-01
Photon flux (15-150 keV) in 64 sec: 6.08769E-02 ( -0.0148027 0.0149005 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65324e-07 ( -4.65402e-08 5.1305e-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 : 1.78299 ( -2.61146 -1.7592 )
beta : -9.37150 ( 9.37166 19.3578 )
Epeak [keV] : 26.4327 ( -10.5929 6.36835 )
Norm@50keV : 0.302500 ( -0.272465 166.256 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.97 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.016649e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68284e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.72889 (-1.44799 1.71456)
R^2/D10^2 : 0.150921 (-0.0921233 0.258238)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 0.9999 for 57 degrees of freedom
# Null hypothesis probability = 4.752932e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.731e-08 3.894e-08
25- 50 8.528e-08 4.975e-08
50-150 1.222e-08 9.612e-09
15-150 1.648e-07 9.120e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 25.5672 (-9.97845 18.9062)
Norm : 0.582018 (-0.227602 0.407213)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.46 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.859983e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.920e-08 3.100e-08
25- 50 7.196e-08 4.254e-08
50-150 3.161e-08 2.594e-08
15-150 1.728e-07 9.482e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.28220 (-5.29685 -5.29685)
R1^2/D10^2 : 0.142318 (-0.126873 -0.126873)
kT2 [keV] : 7.53730 (-7.37278 191.488)
R2^2/D10^2 : 6.40108E-02 (-0.104639 -0.104639)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.011144e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.757e-08 4.864e-06
25- 50 8.362e-08 3.111e-05
50-150 1.465e-08 2.250e-04
15-150 1.658e-07 3.068e-04
Plot creation:
Thu May 26 10:14:10 EDT 2016