batgrbproduct Analysis for Trigger=688452
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 Jun 2 12:55:56 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger688452
======================================================================
Trigger: 00688452 Segment: 000
BAT Trigger Time: 486484998.776 [s; MET]
Trigger Stop: 486484998.84 [s; MET]
UTC: 2016-06-01T14:43:02.422720 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 235.033918410918 Dec: 64.4946031295717 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.25
Image Trigger?: NO
Rate S/N Ratio: 32.2955105239103 [ if not an image trigger ]
Image S/N Ratio: 7.25
Flight Position: [ source = BAT ]
RA: 235.033918410918 Dec: 64.4946031295717 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 234.92326072297 Dec: 64.5315244634172 [deg; J2000]
{ 15h 39m 41.6s , +64d 31' 53.5" }
+/- 1.85603085712621 [arcmin] (estimated 90% radius based on SNR)
+/- 0.744474882577185 [arcmin] (formal 1-sigma fit error)
SNR: 12.5726043316096
Angular difference between Flight and Ground position is 3.615229 arcmin
Partial Coding Fraction: 0.6640625 [ including projection effects ]
Duration
T90: 0.119999945163727 +/- 0.0226274207069314
Measured from: -0.0120000243186951
to: 0.107999920845032 [s; relative to TRIGTIME]
T50: 0.0559999346733093 +/- 0.0169705971403055
Measured from: 0.0199999809265137
to: 0.075999915599823 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.448000013828278
to: 0.551999986171722 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0200000405311584
to: 0.120000004768372 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.017305 0.031920 0.033988 0.010134
0.003738 0.004232 0.004301 0.003447 [error]
Peak 0.019055 0.039388 0.041758 0.010757
0.007715 0.008002 0.007104 0.006169 [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 5.17e-09 1.26e-08 2.45e-08 1.18e-07 6.64e-08 1.60e-07 erg/cm2
Error 1.35e-09 1.97e-09 4.04e-09 4.43e-08 1.05e-08 4.69e-08 erg/cm2
Peak flux Power-law 2.03e-01 2.74e-01 2.72e-01 4.89e-01 9.07e-01 1.24e+00 ph/cm2/s
Error 8.34e-02 6.92e-02 5.67e-02 2.22e-01 1.85e-01 2.61e-01 ph/cm2/s
Fluence Cutoff-PL 5.11e-09 1.27e-08 2.47e-08 1.07e-07 6.62e-08 1.49e-07 erg/cm2
Error 1.51e-09 2.13e-09 4.42e-09 6.98e-08 1.09e-08 6.68e-08 erg/cm2
Peak flux Cutoff-PL 1.62e-01 2.77e-01 2.96e-01 2.76e-01 8.76e-01 1.01e+00 ph/cm2/s
Error 1.04e-01 7.83e-02 7.20e-02 2.19e-01 1.94e-01 3.17e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.70e-01 2.78e-01 2.92e-01 3.00e-01 8.83e-01 1.04e+00 ph/cm2/s
Error -------- -------- -------- 1.64e-01 1.89e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.040 0.243 - - 4.44e-02 6.07e-03 52.430 57
CPL 1.034 0.609 9995.5 0.0 4.47e-02 0.00e+00 52.430 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.009 0.345 - - 7.88e-03 1.57e-03 68.380 57
CPL 0.292 1.354 144.6 0.0 1.56e-02 3.15e-02 67.450 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.140 -0.020 0.120
T90 0.120 -0.012 0.108
T50 0.056 0.020 0.076
Peak 1.000 -0.448 0.552
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
234.9233 +64.5315 0.0153 25.9 144.6 0.1019 12.6 TRIG_00688452
------------------------------------------
Foreground time interval of the image:
-0.020 0.120 (delta_t = 0.140 [sec])
Background time interval of the image:
-239.776 -0.020 (delta_t = 239.756 [sec])
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 -0.020 sec. to 0.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03986 ( -0.245429 0.240351 )
Norm@50keV : 4.44480E-02 ( -0.00606623 0.0060662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.43 using 59 PHA bins.
# Reduced chi-squared = 0.9199 for 57 degrees of freedom
# Null hypothesis probability = 6.468620e-01
Photon flux (15-150 keV) in 0.14 sec: 5.12979 ( -0.70564 0.706111 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.63599e-08 ( -1.04767e-08 1.06014e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.020 sec. to 0.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03450 ( -0.863857 0.354474 )
Epeak [keV] : 9995.47 ( -9994.03 -9994.03 )
Norm@50keV : 4.47071E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.43 using 59 PHA bins.
# Reduced chi-squared = 0.9363 for 56 degrees of freedom
# Null hypothesis probability = 6.107892e-01
Photon flux (15-150 keV) in 0.14 sec: 5.12263 ( -0.72623 0.71361 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.6186e-08 ( -1.1019e-08 1.07549e-08 ) ergs/cm2
Band function
Time interval is from -0.020 sec. to 0.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.882922 ( 0.882922 0.882922 )
beta : -1.03986 ( 1.03986 0.24609 )
Epeak [keV] : 49.1561 ( -49.1561 -49.1561 )
Norm@50keV : 7.09469E-02 ( -0.0325331 6.79465 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.43 using 59 PHA bins.
# Reduced chi-squared = 0.9533 for 55 degrees of freedom
# Null hypothesis probability = 5.733269e-01
Photon flux (15-150 keV) in 0.14 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] : 21.5799 (-4.14624 5.38602)
R^2/D10^2 : 0.191878 (-0.094204 0.181462)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.63 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 57 degrees of freedom
# Null hypothesis probability = 2.275182e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.335e-09 6.552e-10
25- 50 1.221e-08 3.299e-09
50-150 4.245e-08 1.188e-08
15-150 5.699e-08 1.197e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-38.155 -200)
Norm : 20.0650 (-2.87215 2.87215)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.03 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 57 degrees of freedom
# Null hypothesis probability = 2.435143e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.037e-09 4.027e-09
25- 50 1.354e-08 7.658e-09
50-150 2.969e-08 1.642e-08
15-150 5.026e-08 2.813e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.61025 (-3.28463 3.96986)
R1^2/D10^2 : 3.00263 (-2.14855 18.931)
kT2 [keV] : 35.2713 (-10.7205 35.7388)
R2^2/D10^2 : 3.69544E-02 (-0.0310378 0.0791953)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.62 using 59 PHA bins.
# Reduced chi-squared = 0.9385 for 55 degrees of freedom
# Null hypothesis probability = 6.047216e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.138e-09 2.946e-09
25- 50 1.272e-08 6.649e-09
50-150 4.968e-08 2.768e-08
15-150 6.754e-08 3.493e-08
Peak spectrum fit
Power-law model
Time interval is from -0.448 sec. to 0.552 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00864 ( -0.355243 0.335193 )
Norm@50keV : 7.87568E-03 ( -0.00158049 0.0015654 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.38 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 57 degrees of freedom
# Null hypothesis probability = 1.436481e-01
Photon flux (15-150 keV) in 1 sec: 0.907235 ( -0.184585 0.186107 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.49277e-08 ( -1.76383e-08 1.77567e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.448 sec. to 0.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.292343 ( -1.77835 0.929423 )
Epeak [keV] : 144.591 ( -144.737 -144.737 )
Norm@50keV : 1.56382E-02 ( -0.00897959 0.0540346 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.45 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 56 degrees of freedom
# Null hypothesis probability = 1.405678e-01
Photon flux (15-150 keV) in 1 sec: 0.875981 ( -0.194075 0.194109 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.28776e-08 ( -1.82517e-08 1.83164e-08 ) ergs/cm2
Band function
Time interval is from -0.448 sec. to 0.552 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.337842 ( -0.583117 1.89082 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 148.284 ( -68.1893 192.203 )
Norm@50keV : 1.51663E-02 ( -0.00846927 0.0545471 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.45 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 55 degrees of freedom
# Null hypothesis probability = 1.209162e-01
Photon flux (15-150 keV) in 1 sec: 0.883397 ( 6.1166 -0.195167 ) 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] : 24.0989 (-5.44813 7.80898)
R^2/D10^2 : 2.46196E-02 (-0.0141661 0.0307318)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.72 using 59 PHA bins.
# Reduced chi-squared = 1.223 for 57 degrees of freedom
# Null hypothesis probability = 1.201666e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.532e-09 1.031e-09
25- 50 1.409e-08 5.882e-09
50-150 6.095e-08 2.466e-08
15-150 7.757e-08 2.976e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-56.5317 -200)
Norm : 3.75960 (-0.769299 0.769299)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.16 using 59 PHA bins.
# Reduced chi-squared = 1.319 for 57 degrees of freedom
# Null hypothesis probability = 5.380511e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.361e-09 5.485e-09
25- 50 1.801e-08 1.064e-08
50-150 3.949e-08 2.295e-08
15-150 6.686e-08 3.868e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.79879 (-5.33734 9.78266)
R1^2/D10^2 : 0.593687 (-0.574715 1920.68)
kT2 [keV] : 29.7786 (-8.58823 24.1157)
R2^2/D10^2 : 1.16362E-02 (-0.00993305 0.0187128)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.34 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 55 degrees of freedom
# Null hypothesis probability = 1.405885e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.895e-09 3.394e-09
25- 50 1.550e-08 7.855e-09
50-150 6.347e-08 3.647e-08
15-150 8.486e-08 4.430e-08
Plot creation:
Thu Jun 2 13:02:53 EDT 2016