batgrbproduct Analysis for Trigger=675361
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 Feb 23 14:08:31 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger675361/GCN5_download_cron
======================================================================
Trigger: 00675361 Segment: 000
BAT Trigger Time: 477884681.152 [s; MET]
Trigger Stop: 477884685.248 [s; MET]
UTC: 2016-02-23T01:44:25.270300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 147.583623924545 Dec: 9.37258061929805 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.52
Image Trigger?: NO
Rate S/N Ratio: 10.0498756211209 [ if not an image trigger ]
Image S/N Ratio: 7.52
Flight Position: [ source = BAT ]
RA: 147.583623924545 Dec: 9.37258061929805 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 147.603305575492 Dec: 9.36924403663391 [deg; J2000]
{ 09h 50m 24.8s , +09d 22' 09.3" }
+/- 0.953545616628846 [arcmin] (estimated 90% radius based on SNR)
+/- 0.291927939457828 [arcmin] (formal 1-sigma fit error)
SNR: 32.5559640231177
Angular difference between Flight and Ground position is 1.182214 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 126.851999938488 +/- 8.43012127283683
Measured from: -0.0719999074935913
to: 126.780000030994 [s; relative to TRIGTIME]
T50: 21.6199999451637 +/- 5.76529896532722
Measured from: 88.0640001296997
to: 109.684000074863 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 109.948000013828
to: 110.948000013828 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6
to: 143.131999969482 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.743335 2.853435 2.405093 0.522062
0.092881 0.097490 0.085304 0.072933 [error]
Peak 0.082098 0.146419 0.138060 0.037329
0.009109 0.010601 0.010326 0.007525 [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 5.67e-07 1.15e-06 1.81e-06 6.33e-06 5.04e-06 9.85e-06 erg/cm2
Error 4.28e-08 5.08e-08 8.47e-08 6.73e-07 2.11e-07 7.20e-07 erg/cm2
Peak flux Power-law 8.23e-01 9.94e-01 8.70e-01 1.31e+00 3.15e+00 3.99e+00 ph/cm2/s
Error 1.17e-01 8.73e-02 8.03e-02 2.50e-01 2.47e-01 3.38e-01 ph/cm2/s
Fluence Cutoff-PL 5.25e-07 1.18e-06 1.86e-06 3.96e-06 4.92e-06 7.52e-06 erg/cm2
Error 5.33e-08 5.70e-08 9.56e-08 1.48e-06 2.32e-07 1.48e-06 erg/cm2
Peak flux Cutoff-PL 7.61e-01 1.03e+00 9.08e-01 8.57e-01 3.11e+00 3.56e+00 ph/cm2/s
Error 1.40e-01 1.01e-01 9.54e-02 4.05e-01 2.53e-01 5.33e-01 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 1.342 0.070 - - 3.45e-03 1.33e-04 67.650 57
CPL 0.997 0.286 157.1 204.5 5.00e-03 1.54e-03 63.060 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.192 0.131 - - 2.68e-02 2.09e-03 60.370 57
CPL 0.805 0.506 163.9 -47.8 4.13e-02 2.53e-02 58.690 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: 148.992000 sec.
T50 in the 50-300 keV band: 20.608000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 149.132 -6.000 143.132
T90 126.852 -0.072 126.780
T50 21.620 88.064 109.684
Peak 1.000 109.948 110.948
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
147.6033 +9.3692 0.0059 23.5 108.7 7.7549 32.6 TRIG_00675361
------------------------------------------
Foreground time interval of the image:
-6.000 143.132 (delta_t = 149.132 [sec])
Background time interval of the image:
-239.152 -6.000 (delta_t = 233.152 [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 -6.000 sec. to 143.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34197 ( -0.0703095 0.0700849 )
Norm@50keV : 3.45164E-03 ( -0.000132647 0.000132646 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.65 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 57 degrees of freedom
# Null hypothesis probability = 1.580122e-01
Photon flux (15-150 keV) in 149.1 sec: 0.415142 ( -0.0169104 0.0169449 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.03549e-06 ( -2.10273e-07 2.10857e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.000 sec. to 143.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.997132 ( -0.295528 0.276809 )
Epeak [keV] : 157.135 ( -48.5583 360.345 )
Norm@50keV : 5.00429E-03 ( -0.00126096 0.00181265 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.06 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 56 degrees of freedom
# Null hypothesis probability = 2.410024e-01
Photon flux (15-150 keV) in 149.1 sec: 0.406741 ( -0.018111 0.018133 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.91966e-06 ( -2.32939e-07 2.31627e-07 ) ergs/cm2
Band function
Time interval is from -6.000 sec. to 143.132 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.311197 ( -0.86069 3.76672 )
beta : -1.45052 ( 1.45118 0.112721 )
Epeak [keV] : 60.6118 ( -31.8032 166.664 )
Norm@50keV : 1.40828E-02 ( -0.00900145 20.4062 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.86 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 55 degrees of freedom
# Null hypothesis probability = 2.178299e-01
Photon flux (15-150 keV) in 149.1 sec: 0.406883 ( ) 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] : 17.6634 ( )
R^2/D10^2 : 2.73408E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 178.24 using 59 PHA bins.
# Reduced chi-squared = 3.1270 for 57 degrees of freedom
# Null hypothesis probability = 2.081608e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.562e-07 2.095e-08
25- 50 1.168e-06 6.568e-08
50-150 2.631e-06 1.774e-07
15-150 4.056e-06 2.043e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-7.99931 -200)
Norm : 1.73533 (-0.0671204 0.0671204)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.01 using 59 PHA bins.
# Reduced chi-squared = 1.597 for 57 degrees of freedom
# Null hypothesis probability = 2.810297e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.445e-07 2.706e-08
25- 50 1.240e-06 5.241e-08
50-150 2.719e-06 1.163e-07
15-150 4.603e-06 1.968e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.83686 (-1.16561 1.3031)
R1^2/D10^2 : 0.250754 (-0.0940284 0.173039)
kT2 [keV] : 28.8019 (-3.69498 5.66661)
R2^2/D10^2 : 4.26683E-03 (-0.00197149 0.00273802)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.92 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 55 degrees of freedom
# Null hypothesis probability = 2.163280e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.934e-07 7.485e-08
25- 50 1.203e-06 1.563e-07
50-150 3.221e-06 4.436e-07
15-150 4.918e-06 5.979e-07
Peak spectrum fit
Power-law model
Time interval is from 109.948 sec. to 110.948 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19233 ( -0.131498 0.131101 )
Norm@50keV : 2.68237E-02 ( -0.00208939 0.00208793 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.37 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 57 degrees of freedom
# Null hypothesis probability = 3.548902e-01
Photon flux (15-150 keV) in 1 sec: 3.14520 ( -0.247358 0.247473 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72727e-07 ( -2.40977e-08 2.42494e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 109.948 sec. to 110.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.805080 ( -0.567491 0.443711 )
Epeak [keV] : 163.855 ( -68.3308 -163.855 )
Norm@50keV : 4.13430E-02 ( -0.0156522 0.0349916 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.69 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 56 degrees of freedom
# Null hypothesis probability = 3.771666e-01
Photon flux (15-150 keV) in 1 sec: 3.10554 ( -0.25236 0.25294 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.66626e-07 ( -2.5995e-08 2.5792e-08 ) ergs/cm2
Band function
Time interval is from 109.948 sec. to 110.948 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 8.85323E-02 ( 0.147979 0.147979 )
beta : -1.36178 ( 1.354 0.219745 )
Epeak [keV] : 60.7542 ( -60.7814 170.789 )
Norm@50keV : 0.155874 ( -0.157261 689.938 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.90 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 55 degrees of freedom
# Null hypothesis probability = 3.687253e-01
Photon flux (15-150 keV) in 1 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] : 18.2473 (-1.84744 2.10039)
R^2/D10^2 : 0.198817 (-0.0596218 0.0835271)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.65 using 59 PHA bins.
# Reduced chi-squared = 1.538 for 57 degrees of freedom
# Null hypothesis probability = 5.628241e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.320e-08 2.040e-09
25- 50 6.165e-08 6.275e-09
50-150 1.495e-07 2.015e-08
15-150 2.243e-07 2.220e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-18.0258 -200)
Norm : 12.7988 (-1.01442 1.01442)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.27 using 59 PHA bins.
# Reduced chi-squared = 1.373 for 57 degrees of freedom
# Null hypothesis probability = 3.228658e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.187e-08 3.245e-09
25- 50 6.131e-08 1.135e-08
50-150 1.344e-07 5.215e-08
15-150 2.276e-07 6.990e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.50229 (-2.27923 2.82521)
R1^2/D10^2 : 1.39201 (-0.752558 2.18596)
kT2 [keV] : 31.7601 (-7.49634 22.2281)
R2^2/D10^2 : 2.58021E-02 (-0.0206871 0.0405011)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.97 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 55 degrees of freedom
# Null hypothesis probability = 3.662863e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.290e-08 8.231e-09
25- 50 6.159e-08 2.093e-08
50-150 1.841e-07 8.705e-08
15-150 2.686e-07 1.079e-07
Plot creation:
Tue Feb 23 14:19:02 EST 2016