batgrbproduct Analysis for Trigger=674670
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): Sat Feb 20 23:34:54 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger674670/GCN5_download_cron
======================================================================
Trigger: 00674670 Segment: 000
BAT Trigger Time: 477624341.568 [s; MET]
Trigger Stop: 477624345.664 [s; MET]
UTC: 2016-02-20T01:25:25.700460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 236.924873803515 Dec: -18.5551027454631 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.35
Image Trigger?: NO
Rate S/N Ratio: 11.3137084989848 [ if not an image trigger ]
Image S/N Ratio: 7.35
Flight Position: [ source = BAT ]
RA: 236.924873803515 Dec: -18.5551027454631 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 236.941837183488 Dec: -18.538945311514 [deg; J2000]
{ 15h 47m 46.0s , -18d 32' 20.2" }
+/- 1.75603841407623 [arcmin] (estimated 90% radius based on SNR)
+/- 0.661864407579045 [arcmin] (formal 1-sigma fit error)
SNR: 13.6076796635804
Angular difference between Flight and Ground position is 1.367822 arcmin
Partial Coding Fraction: 0.2695312 [ including projection effects ]
Duration
T90: 8.26399993896484 +/- 1.15739016740886
Measured from: 0.476000130176544
to: 8.74000006914139 [s; relative to TRIGTIME]
T50: 4.50799995660782 +/- 1.27404863235378
Measured from: 2.03600007295609
to: 6.5440000295639 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.328000009059906
to: 1.32800000905991 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0239999890327454
to: 8.9879999756813 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.244977 0.328358 0.229089 0.053390
0.041648 0.038326 0.031477 0.025294 [error]
Peak 0.049417 0.051844 0.025312 0.020704
0.013813 0.013119 0.010408 0.009290 [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 7.43e-08 1.32e-07 1.81e-07 5.10e-07 5.22e-07 8.97e-07 erg/cm2
Error 1.76e-08 1.84e-08 3.12e-08 1.97e-07 7.43e-08 2.18e-07 erg/cm2
Peak flux Power-law 3.62e-01 3.40e-01 2.22e-01 2.24e-01 1.02e+00 1.15e+00 ph/cm2/s
Error 1.92e-01 1.10e-01 8.39e-02 1.89e-01 3.13e-01 3.34e-01 ph/cm2/s
Fluence Cutoff-PL 7.42e-08 1.33e-07 1.79e-07 4.98e-07 5.19e-07 8.57e-07 erg/cm2
Error 1.77e-08 1.84e-08 3.11e-08 3.18e-07 7.52e-08 2.77e-07 erg/cm2
Peak flux Cutoff-PL 3.70e-01 3.42e-01 2.19e-01 2.15e-01 1.02e+00 1.15e+00 ph/cm2/s
Error 1.93e-01 1.17e-01 8.55e-02 2.48e-01 3.13e-01 3.51e-01 ph/cm2/s
Fluence Band 6.09e-08 1.33e-07 1.58e-07 3.46e-07 4.56e-07 7.03e-07 erg/cm2
Error -------- -------- 3.08e-08 -------- 7.40e-08 -------- erg/cm2
Peak flux Band 3.51e-01 3.58e-01 2.31e-01 1.57e-01 1.02e+00 1.10e+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 1.551 0.244 - - 6.15e-03 8.09e-04 34.630 57
CPL 2.393 0.767 137.3 0.0 2.31e-03 0.00e+00 34.340 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.617 0.568 - - 7.87e-03 2.37e-03 61.380 57
CPL 2.270 1.365 98.7 0.0 3.48e-03 0.00e+00 61.170 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: 7.936000 sec.
T50 in the 50-300 keV band: 4.096000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 9.012 -0.024 8.988
T90 8.264 0.476 8.740
T50 4.508 2.036 6.544
Peak 1.000 0.328 1.328
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
236.9418 -18.5389 0.0143 28.8 99.2 0.9027 13.6 TRIG_00674670
------------------------------------------
Foreground time interval of the image:
-0.024 8.988 (delta_t = 9.012 [sec])
Background time interval of the image:
-239.568 -10.658 (delta_t = 228.910 [sec])
-10.568 -0.024 (delta_t = 10.544 [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 -0.024 sec. to 8.988 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55099 ( -0.243455 0.24412 )
Norm@50keV : 6.15454E-03 ( -0.000811539 0.000806098 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.63 using 59 PHA bins.
# Reduced chi-squared = 0.6075 for 57 degrees of freedom
# Null hypothesis probability = 9.916280e-01
Photon flux (15-150 keV) in 9.012 sec: 0.779350 ( -0.105277 0.10571 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.22078e-07 ( -7.39556e-08 7.47358e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.024 sec. to 8.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.39278 ( -1.40343 0.131125 )
Epeak [keV] : 137.329 ( )
Norm@50keV : 2.30622E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.34 using 59 PHA bins.
# Reduced chi-squared = 0.6132 for 56 degrees of freedom
# Null hypothesis probability = 9.900278e-01
Photon flux (15-150 keV) in 9.012 sec: 0.781596 ( -0.107132 0.103431 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.19007e-07 ( -7.33315e-08 7.7022e-08 ) ergs/cm2
Band function
Time interval is from -0.024 sec. to 8.988 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30401 ( 1.30407 1.30407 )
beta : -1.55098 ( 1.55098 0.243627 )
Epeak [keV] : 38.6842 ( -38.6263 -38.6263 )
Norm@50keV : 1.08418E-02 ( -0.00547613 0.236819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.63 using 59 PHA bins.
# Reduced chi-squared = 0.6296 for 55 degrees of freedom
# Null hypothesis probability = 9.856344e-01
Photon flux (15-150 keV) in 9.012 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.56441e-07 ( -4.56378e-07 -7.36866e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.6117 (-2.80846 3.72262)
R^2/D10^2 : 9.07505E-02 (-0.0900402 0.105393)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.24 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.662381e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.670e-08 1.020e-08
25- 50 1.423e-07 3.213e-08
50-150 2.043e-07 5.592e-08
15-150 3.833e-07 7.250e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.345 (-87.2746 -199.357)
Norm : 3.15575 (-0.406609 0.407506)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.79 using 59 PHA bins.
# Reduced chi-squared = 0.6278 for 57 degrees of freedom
# Null hypothesis probability = 9.875099e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.082e-08 3.994e-08
25- 50 1.362e-07 7.448e-08
50-150 2.988e-07 1.647e-07
15-150 5.058e-07 2.818e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.36923 (-2.03542 2.42261)
R1^2/D10^2 : 0.811440 (-0.507883 1.59882)
kT2 [keV] : 37.1158 (-13.7232 86.3481)
R2^2/D10^2 : 3.20671E-03 (-0.00292113 0.0111935)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.74 using 59 PHA bins.
# Reduced chi-squared = 0.6134 for 55 degrees of freedom
# Null hypothesis probability = 9.894012e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.250e-08 3.490e-08
25- 50 1.374e-07 6.580e-08
50-150 3.337e-07 1.768e-07
15-150 5.436e-07 2.501e-07
Peak spectrum fit
Power-law model
Time interval is from 0.328 sec. to 1.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61706 ( -0.583876 0.551775 )
Norm@50keV : 7.86649E-03 ( -0.00238854 0.00234308 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.38 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 57 degrees of freedom
# Null hypothesis probability = 3.220306e-01
Photon flux (15-150 keV) in 1 sec: 1.01629 ( -0.311399 0.314191 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.34207e-08 ( -2.3096e-08 2.37492e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.328 sec. to 1.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.26959 ( -2.64917 0.0799521 )
Epeak [keV] : 98.6754 ( )
Norm@50keV : 3.47680E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.17 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 56 degrees of freedom
# Null hypothesis probability = 2.955870e-01
Photon flux (15-150 keV) in 1 sec: 1.02056 ( -0.316025 0.30981 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.34925e-08 ( -1.29955e-08 2.3177e-08 ) ergs/cm2
Band function
Time interval is from 0.328 sec. to 1.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97453 ( -4.97453 -4.97453 )
beta : -1.84966 ( -0.801575 0.686448 )
Epeak [keV] : 26.0627 ( -26.0627 69.5497 )
Norm@50keV : 736.867 ( -211.059 8.05615e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.33 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 55 degrees of freedom
# Null hypothesis probability = 2.892870e-01
Photon flux (15-150 keV) in 1 sec: 1.02164 ( ) 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] : 10.6572 (-3.08675 6.36072)
R^2/D10^2 : 0.380408 (-0.379214 1.06146)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.08 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 57 degrees of freedom
# Null hypothesis probability = 2.161733e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.964e-09 5.690e-09
25- 50 2.432e-08 1.478e-08
50-150 1.522e-08 1.053e-08
15-150 4.850e-08 2.999e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 174.788 (-126.137 -174.788)
Norm : 4.10577 (-1.235 2.37905)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.69 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 57 degrees of freedom
# Null hypothesis probability = 3.122538e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.039e-08 6.015e-09
25- 50 1.966e-08 1.155e-08
50-150 4.119e-08 2.442e-08
15-150 7.125e-08 4.287e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.00882 (-2.53185 3.64713)
R1^2/D10^2 : 0.969141 (-0.733625 3.47135)
kT2 [keV] : 91.2232 (-69.5912 -92.9312)
R2^2/D10^2 : 5.22208E-04 (-0.000454782 0.0025464)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.58 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.55 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 55 degrees of freedom
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.456643e-01
# Null hypothesis probability = 3.466731e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.161e-08 7.075e-09
25- 50 2.191e-08 1.306e-08
50-150 4.870e-08 2.712e-08
15-150 8.223e-08 3.822e-08
Plot creation:
Sat Feb 20 23:43:45 EST 2016