batgrbproduct Analysis for Trigger=684098
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): Tue Apr 26 18:29:42 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger684098/GCN5_download_cron
======================================================================
Trigger: 00684098 Segment: 000
BAT Trigger Time: 483319587.52 [s; MET]
Trigger Stop: 483319587.776 [s; MET]
UTC: 2016-04-25T23:26:11.341240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 280.313549845198 Dec: -54.3595799473253 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.8
Image Trigger?: NO
Rate S/N Ratio: 32.9545141065682 [ if not an image trigger ]
Image S/N Ratio: 11.8
Flight Position: [ source = BAT ]
RA: 280.313549845198 Dec: -54.3595799473253 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.336863191682 Dec: -54.3166496109706 [deg; J2000]
{ 18h 41m 20.8s , -54d 18' 59.9" }
+/- 3.54446517661953 [arcmin] (estimated 90% radius based on SNR)
+/- 2.42627624666371 [arcmin] (formal 1-sigma fit error)
SNR: 4.98937252953942
Angular difference between Flight and Ground position is 2.701831 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 304.583999931812 +/- 15.0418216869062
Measured from: 0.196000158786774
to: 304.780000090599 [s; relative to TRIGTIME]
T50: 116.351999938488 +/- 105.681125315048
Measured from: 165.460000157356
to: 281.812000095844 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.271999955177307
to: 0.728000044822693 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.532000005245209
to: 319.800000011921 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.748797 1.580206 0.753576 0.169345
0.115540 0.113049 0.096228 0.085798 [error]
Peak 0.098729 0.123133 0.099649 0.018383
0.008859 0.009168 0.008113 0.005846 [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 5.57e-07 6.70e-07 5.84e-07 8.72e-07 2.12e-06 2.68e-06 erg/cm2
Error 6.68e-08 5.61e-08 9.42e-08 2.79e-07 2.09e-07 3.83e-07 erg/cm2
Peak flux Power-law 9.59e-01 9.41e-01 6.47e-01 6.99e-01 2.83e+00 3.25e+00 ph/cm2/s
Error 1.27e-01 7.81e-02 6.66e-02 1.45e-01 2.26e-01 2.60e-01 ph/cm2/s
Fluence Cutoff-PL 5.54e-07 6.75e-07 5.82e-07 7.70e-07 2.10e-06 2.58e-06 erg/cm2
Error 7.16e-08 6.60e-08 9.90e-08 4.53e-07 2.44e-07 5.53e-07 erg/cm2
Peak flux Cutoff-PL 9.13e-01 9.71e-01 6.64e-01 4.96e-01 2.80e+00 3.04e+00 ph/cm2/s
Error 1.46e-01 9.21e-02 7.36e-02 2.48e-01 2.31e-01 3.56e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 9.06e-01 9.73e-01 6.66e-01 4.83e-01 2.79e+00 3.03e+00 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 2.199 0.177 - - 7.03e-04 8.04e-05 54.250 57
CPL 1.992 0.286 1.7 21.1 9.19e-04 0.00e+00 54.360 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.542 0.135 - - 2.24e-02 1.83e-03 58.950 57
CPL 1.249 0.444 127.5 0.0 3.16e-02 0.00e+00 57.840 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: 286.272000 sec.
T50 in the 50-300 keV band: 199.616000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 320.332 -0.532 319.800
T90 304.584 0.196 304.780
T50 116.352 165.460 281.812
Peak 1.000 -0.272 0.728
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.3369 -54.3166 0.0386 24.7 -127.1 0.9373 5.0 TRIG_00684098
------------------------------------------
Foreground time interval of the image:
-0.532 140.781 (delta_t = 141.313 [sec])
Background time interval of the image:
-239.520 -0.532 (delta_t = 238.988 [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 -0.532 sec. to 319.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19875 ( -0.171979 0.181208 )
Norm@50keV : 7.03148E-04 ( -8.12717e-05 7.94801e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.25 using 59 PHA bins.
# Reduced chi-squared = 0.9517 for 57 degrees of freedom
# Null hypothesis probability = 5.790543e-01
Photon flux (15-150 keV) in 320.3 sec: 0.116332 ( -0.00962806 0.00964025 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11716e-06 ( -2.06699e-07 2.10825e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.532 sec. to 319.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99204 ( -0.55011 0.0215451 )
Epeak [keV] : 1.65548 ( -0.824294 41.3437 )
Norm@50keV : 9.19251E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.36 using 59 PHA bins.
# Reduced chi-squared = 0.9707 for 56 degrees of freedom
# Null hypothesis probability = 5.371894e-01
Photon flux (15-150 keV) in 320.3 sec: 0.115943 ( -0.010281 0.009918 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10322e-06 ( -2.50135e-07 2.38748e-07 ) ergs/cm2
Band function
Time interval is from -0.532 sec. to 319.800 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.67819 ( 2.67819 2.67819 )
beta : -2.19875 ( -0.181212 0.17206 )
Epeak [keV] : 11.1896 ( -11.1896 -11.1896 )
Norm@50keV : 9.55680E-02 ( -0.0110461 0.0108023 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.25 using 59 PHA bins.
# Reduced chi-squared = 0.9863 for 55 degrees of freedom
# Null hypothesis probability = 5.034068e-01
Photon flux (15-150 keV) in 320.3 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] : 8.75131 (-0.895878 1.0109)
R^2/D10^2 : 8.47416E-02 (-0.029909 0.0462248)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.69 using 59 PHA bins.
# Reduced chi-squared = 1.609 for 57 degrees of freedom
# Null hypothesis probability = 2.433610e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.986e-07 6.081e-08
25- 50 8.105e-07 8.552e-08
50-150 2.836e-07 8.361e-08
15-150 1.493e-06 1.549e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 50.5171 (-11.1544 16.539)
Norm : 0.641477 (-0.0951698 0.1221)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.90 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.420340e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.036e-07 5.717e-08
25- 50 7.259e-07 6.358e-08
50-150 7.116e-07 1.579e-07
15-150 1.941e-06 2.079e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.14194 (-1.23223 1.25733)
R1^2/D10^2 : 0.546383 (-0.309162 0.878714)
kT2 [keV] : 18.6430 (-4.7755 8.39253)
R2^2/D10^2 : 3.10210E-03 (-0.00233846 0.00744251)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.03 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 55 degrees of freedom
# Null hypothesis probability = 4.359771e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.438e-07 2.090e-07
25- 50 6.568e-07 2.132e-07
50-150 8.405e-07 4.580e-07
15-150 2.041e-06 6.842e-07
Peak spectrum fit
Power-law model
Time interval is from -0.272 sec. to 0.728 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54155 ( -0.134167 0.135834 )
Norm@50keV : 2.23845E-02 ( -0.00183625 0.00182573 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.95 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 57 degrees of freedom
# Null hypothesis probability = 4.039588e-01
Photon flux (15-150 keV) in 1 sec: 2.82686 ( -0.226173 0.226354 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10987e-07 ( -1.8769e-08 1.89e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.272 sec. to 0.728 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24873 ( -0.524279 0.362804 )
Epeak [keV] : 127.504 ( )
Norm@50keV : 3.16460E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.84 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 56 degrees of freedom
# Null hypothesis probability = 4.070587e-01
Photon flux (15-150 keV) in 1 sec: 2.79700 ( -0.23122 0.23119 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06961e-07 ( -2.014e-08 2.0079e-08 ) ergs/cm2
Band function
Time interval is from -0.272 sec. to 0.728 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24893 ( -0.277676 0.586117 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 127.529 ( -40.3191 -127.529 )
Norm@50keV : 3.16353E-02 ( -0.0106047 0.0261555 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.84 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.707567e-01
Photon flux (15-150 keV) in 1 sec: 2.79242 ( ) 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] : 14.5435 (-1.58554 1.79604)
R^2/D10^2 : 0.352946 (-0.118264 0.177508)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 102.21 using 59 PHA bins.
# Reduced chi-squared = 1.7932 for 57 degrees of freedom
# Null hypothesis probability = 2.220924e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.570e-08 2.530e-09
25- 50 6.061e-08 6.625e-09
50-150 8.601e-08 1.435e-08
15-150 1.623e-07 1.680e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-61.7902 -199.363)
Norm : 11.5556 (-0.905789 0.90683)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.87 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 57 degrees of freedom
# Null hypothesis probability = 4.430597e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.877e-08 2.750e-09
25- 50 5.535e-08 9.035e-09
50-150 1.214e-07 3.550e-08
15-150 2.055e-07 4.215e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.64652 (-1.17492 1.39041)
R1^2/D10^2 : 3.74034 (-1.80275 3.83276)
kT2 [keV] : 26.4340 (-4.77698 7.62807)
R2^2/D10^2 : 3.45301E-02 (-0.0200865 0.036493)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.10 using 59 PHA bins.
# Reduced chi-squared = 0.9655 for 55 degrees of freedom
# Null hypothesis probability = 5.474598e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.914e-08 8.895e-09
25- 50 5.470e-08 1.342e-08
50-150 1.259e-07 4.448e-08
15-150 2.097e-07 6.498e-08
Plot creation:
Tue Apr 26 18:34:26 EDT 2016