batgrbproduct Analysis for Trigger=687123
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): Mon May 23 13:11:02 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger687123/GCN5_download_cron
======================================================================
Trigger: 00687123 Segment: 000
BAT Trigger Time: 485553723.644 [s; MET]
Trigger Stop: 485553723.708 [s; MET]
UTC: 2016-05-21T20:01:47.342220 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 293.749746391611 Dec: 21.9107592491394 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.93
Image Trigger?: NO
Rate S/N Ratio: 14.2828568570857 [ if not an image trigger ]
Image S/N Ratio: 6.93
Flight Position: [ source = BAT ]
RA: 293.749746391611 Dec: 21.9107592491394 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 293.738543943893 Dec: 21.8954708377696 [deg; J2000]
{ 19h 34m 57.3s , +21d 53' 43.7" }
+/- 2.87815243081556 [arcmin] (estimated 90% radius based on SNR)
+/- 1.4270098557825 [arcmin] (formal 1-sigma fit error)
SNR: 6.71802376246275
Angular difference between Flight and Ground position is 1.109216 arcmin
Partial Coding Fraction: 0.4804688 [ including projection effects ]
Duration
T90: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
T50: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0640000104904175 second)
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.016693 0.018694 0.002838 -0.000935
0.003646 0.003680 0.002344 0.001704 [error]
Peak 0.016693 0.018694 0.002838 -0.000935
0.003646 0.003680 0.002344 0.001704 [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 5.45e-09 3.65e-09 1.60e-09 9.59e-10 1.12e-08 1.15e-08 erg/cm2
Error 1.71e-09 1.31e-09 9.56e-10 1.10e-09 3.64e-09 4.01e-09 erg/cm2
Peak flux Power-law 2.85e+00 1.07e+00 2.32e-01 6.02e-02 4.19e+00 4.22e+00 ph/cm2/s
Error 9.04e-01 3.76e-01 1.37e-01 6.72e-02 1.26e+00 1.27e+00 ph/cm2/s
Fluence Cutoff-PL 5.08e-09 8.34e-09 7.93e-10 4.62e-13 1.42e-08 1.42e-08 erg/cm2
Error 1.97e-09 2.72e-09 1.16e-09 2.33e-11 3.96e-09 3.96e-09 erg/cm2
Peak flux Cutoff-PL 2.48e+00 2.46e+00 1.36e-01 4.27e-05 5.08e+00 5.08e+00 ph/cm2/s
Error 1.02e+00 7.69e-01 1.88e-01 2.05e-03 1.33e+00 1.33e+00 ph/cm2/s
Fluence Band 5.17e-09 8.18e-09 1.17e-09 1.01e-11 1.45e-08 1.45e-08 erg/cm2
Error 1.89e-09 2.71e-09 1.19e-09 2.03e-10 3.93e-09 3.93e-09 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 3.225 0.527 - - 1.29e-02 6.40e-03 65.270 57
CPL -4.570 -0.128 28.8 5.3 1.62e+03 7.07e+06 50.770 56
The chi2 of BB fit is 51.58 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 3.225 0.527 - - 1.29e-02 6.40e-03 65.270 57
CPL -4.570 -0.128 28.8 5.3 1.62e+03 7.07e+06 50.770 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 0.064 0.000 0.064
T90 0.064 0.000 0.064
T50 0.064 0.000 0.064
Peak 0.064 0.000 0.064
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
293.7385 +21.8955 0.0287 34.8 -131.6 0.0402 6.7 TRIG_00687123
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-168.543 -3.644 (delta_t = 164.899 [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 0.000 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.22499 ( -0.42629 0.628025 )
Norm@50keV : 1.28711E-02 ( -0.00617378 0.0066271 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.27 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 57 degrees of freedom
# Null hypothesis probability = 2.112778e-01
Photon flux (15-150 keV) in 0.064 sec: 4.19233 ( -1.2632 1.26277 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1168e-08 ( -3.57632e-09 3.70756e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.57010 ( 3.29886 3.04283 )
Epeak [keV] : 28.8188 ( -5.71091 4.84353 )
Norm@50keV : 1618.97 ( -1589.1 1.41297e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.77 using 59 PHA bins.
# Reduced chi-squared = 0.9067 for 56 degrees of freedom
# Null hypothesis probability = 6.724412e-01
Photon flux (15-150 keV) in 0.064 sec: 5.07929 ( -1.34026 1.3226 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42179e-08 ( -4.02458e-09 3.9049e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.54353 ( -4.28851 -4.54353 )
beta : -9.94555 ( 9.94555 18.2645 )
Epeak [keV] : 28.8243 ( -4.33402 4.64972 )
Norm@50keV : 1548.68 ( -382.881 7923.05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.84 using 59 PHA bins.
# Reduced chi-squared = 0.9243 for 55 degrees of freedom
# Null hypothesis probability = 6.343994e-01
Photon flux (15-150 keV) in 0.064 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4529e-08 ( -1.45285e-08 -4.12294e-09 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.05639 (-1.25277 1.26602)
R^2/D10^2 : 10.6879 (-5.65208 13.3341)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.58 using 59 PHA bins.
# Reduced chi-squared = 0.9048 for 57 degrees of freedom
# Null hypothesis probability = 6.779915e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.517e-09 2.483e-09
25- 50 7.674e-09 3.579e-09
50-150 1.309e-09 9.936e-10
15-150 1.450e-08 6.656e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.5957 (-5.906 7.74282)
Norm : 58.5851 (-22.2067 36.7235)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.74 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 57 degrees of freedom
# Null hypothesis probability = 4.478108e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.959e-09 2.401e-09
25- 50 5.337e-09 2.582e-09
50-150 1.678e-09 1.257e-09
15-150 1.297e-08 4.972e-09
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.744941 (-7.05659 -7.05659)
R1^2/D10^2 : 3.93652E+07 (-3.62113e+07 -3.62113e+07)
kT2 [keV] : 7.08907 (-1.27521 1.31452)
R2^2/D10^2 : 10.4184 (-5.74085 13.5034)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.58 using 59 PHA bins.
#Fit statistic : Chi-Squared = 51.55 using 59 PHA bins.
# Reduced chi-squared = 0.9377 for 55 degrees of freedom
# Reduced chi-squared = 0.9373 for 55 degrees of freedom
# Null hypothesis probability = 6.062466e-01
# Null hypothesis probability = 6.072033e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.518e-09 2.143e+00
25- 50 7.671e-09 1.977e+01
50-150 1.307e-09 4.173e+02
15-150 1.450e-08 4.918e+02
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.22499 ( -0.42629 0.628025 )
Norm@50keV : 1.28711E-02 ( -0.00617378 0.0066271 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.27 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 57 degrees of freedom
# Null hypothesis probability = 2.112778e-01
Photon flux (15-150 keV) in 0.064 sec: 4.19233 ( -1.2632 1.26277 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1168e-08 ( -3.57632e-09 3.70756e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.57010 ( 3.29886 3.04283 )
Epeak [keV] : 28.8188 ( -5.71091 4.84353 )
Norm@50keV : 1618.97 ( -1589.1 1.41297e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.77 using 59 PHA bins.
# Reduced chi-squared = 0.9067 for 56 degrees of freedom
# Null hypothesis probability = 6.724412e-01
Photon flux (15-150 keV) in 0.064 sec: 5.07929 ( -1.34026 1.3226 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42179e-08 ( -4.02458e-09 3.9049e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.54353 ( -4.28851 -4.54353 )
beta : -9.94555 ( 9.94555 18.2645 )
Epeak [keV] : 28.8243 ( -4.33402 4.64972 )
Norm@50keV : 1548.68 ( -382.881 7923.05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.84 using 59 PHA bins.
# Reduced chi-squared = 0.9243 for 55 degrees of freedom
# Null hypothesis probability = 6.343994e-01
Photon flux (15-150 keV) in 0.064 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4529e-08 ( -1.45285e-08 -4.12294e-09 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.05639 (-1.25277 1.26602)
R^2/D10^2 : 10.6879 (-5.65208 13.3341)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.58 using 59 PHA bins.
# Reduced chi-squared = 0.9048 for 57 degrees of freedom
# Null hypothesis probability = 6.779915e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.517e-09 2.770e-09
25- 50 7.674e-09 3.533e-09
50-150 1.309e-09 9.782e-10
15-150 1.450e-08 6.819e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.5957 (-5.906 7.74282)
Norm : 58.5851 (-22.2067 36.7235)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.74 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 57 degrees of freedom
# Null hypothesis probability = 4.478108e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.959e-09 2.381e-09
25- 50 5.337e-09 2.304e-09
50-150 1.678e-09 1.293e-09
15-150 1.297e-08 4.720e-09
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.744941 (-7.05659 -7.05659)
R1^2/D10^2 : 3.93652E+07 (-3.62113e+07 -3.62113e+07)
kT2 [keV] : 7.08907 (-1.27521 1.31452)
R2^2/D10^2 : 10.4184 (-5.74085 13.5034)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.58 using 59 PHA bins.
#Fit statistic : Chi-Squared = 51.55 using 59 PHA bins.
# Reduced chi-squared = 0.9377 for 55 degrees of freedom
# Reduced chi-squared = 0.9373 for 55 degrees of freedom
# Null hypothesis probability = 6.062466e-01
# Null hypothesis probability = 6.072033e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.518e-09 2.261e+00
25- 50 7.671e-09 1.880e+01
50-150 1.307e-09 4.176e+02
15-150 1.450e-08 4.794e+02
Plot creation:
Mon May 23 13:16:30 EDT 2016