batgrbproduct Analysis for Trigger=615873
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 Oct 20 21:21:24 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger615873/GCN5_download_cron
======================================================================
Trigger: 00615873 Segment: 000
BAT Trigger Time: 435484131.968 [s; MET]
Trigger Stop: 435484134.016 [s; MET]
UTC: 2014-10-20T07:48:39.289560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 225.009297940176 Dec: 55.3338460383256 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.16
Image Trigger?: NO
Rate S/N Ratio: 10.816653826392 [ if not an image trigger ]
Image S/N Ratio: 7.16
Flight Position: [ source = BAT ]
RA: 225.009297940176 Dec: 55.3338460383256 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 225.03425461819 Dec: 55.3186118481906 [deg; J2000]
{ 15h 00m 08.2s , +55d 19' 07.0" }
+/- 1.62425334029165 [arcmin] (estimated 90% radius based on SNR)
+/- 0.626291137581832 [arcmin] (formal 1-sigma fit error)
SNR: 15.211933734414
Angular difference between Flight and Ground position is 1.249473 arcmin
Partial Coding Fraction: 0.671875 [ including projection effects ]
Duration
T90: 15.5479999184608 +/- 2.05455590614739
Measured from: -5.22399985790253
to: 10.3240000605583 [s; relative to TRIGTIME]
T50: 8.23199993371964 +/- 1.88830507202122
Measured from: -0.619999885559082
to: 7.61200004816055 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.199999988079071
to: 0.800000011920929 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.6599999666214
to: 11.2960000038147 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.268240 0.336494 0.165183 0.060829
0.027969 0.029182 0.025046 0.020958 [error]
Peak 0.035186 0.034285 0.022967 0.006998
0.006783 0.007319 0.006236 0.005269 [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 7.96e-08 1.27e-07 1.52e-07 3.57e-07 4.61e-07 7.15e-07 erg/cm2
Error 1.23e-08 1.30e-08 2.43e-08 1.16e-07 5.69e-08 1.39e-07 erg/cm2
Peak flux Power-law 2.54e-01 2.44e-01 1.63e-01 1.70e-01 7.30e-01 8.31e-01 ph/cm2/s
Error 8.93e-02 5.56e-02 5.05e-02 1.06e-01 1.63e-01 1.92e-01 ph/cm2/s
Fluence Cutoff-PL 7.64e-08 1.34e-07 1.52e-07 1.70e-07 4.41e-07 5.32e-07 erg/cm2
Error 1.37e-08 1.78e-08 2.65e-08 2.41e-07 6.64e-08 2.20e-07 erg/cm2
Peak flux Cutoff-PL 2.52e-01 2.44e-01 1.64e-01 1.57e-01 7.29e-01 8.13e-01 ph/cm2/s
Error 7.95e-02 6.55e-02 5.20e-02 1.46e-01 1.64e-01 2.19e-01 ph/cm2/s
Fluence Band 7.40e-08 1.38e-07 1.45e-07 2.58e-07 4.43e-07 6.21e-07 erg/cm2
Error 1.47e-08 -------- 2.70e-08 -------- 4.68e-08 -------- 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 1.736 0.185 - - 2.95e-03 3.46e-04 70.130 57
CPL 1.307 0.630 71.0 -26.2 5.12e-03 6.79e-03 69.130 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.579 0.394 - - 5.71e-03 1.38e-03 69.730 57
CPL 1.560 1.086 952.8 0.0 5.86e-03 2.71e-02 69.730 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: 18.432000 sec.
T50 in the 50-300 keV band: 9.152000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 16.956 -5.660 11.296
T90 15.548 -5.224 10.324
T50 8.232 -0.620 7.612
Peak 1.000 -0.200 0.800
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
225.0343 +55.3186 0.0127 20.8 108.9 0.8356 15.2 TRIG_00615873
------------------------------------------
Foreground time interval of the image:
-5.660 11.296 (delta_t = 16.956 [sec])
Background time interval of the image:
-239.968 -5.660 (delta_t = 234.308 [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 -5.660 sec. to 11.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73612 ( -0.181709 0.187763 )
Norm@50keV : 2.94506E-03 ( -0.000348991 0.000342827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.13 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 57 degrees of freedom
# Null hypothesis probability = 1.135788e-01
Photon flux (15-150 keV) in 16.96 sec: 0.396204 ( -0.0408211 0.0408324 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.61276e-07 ( -5.63876e-08 5.73804e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.660 sec. to 11.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30742 ( -0.882041 0.377314 )
Epeak [keV] : 70.9678 ( -18.5705 -70.97 )
Norm@50keV : 5.12320E-03 ( -0.00268324 0.0109017 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.13 using 59 PHA bins.
# Reduced chi-squared = 1.234 for 56 degrees of freedom
# Null hypothesis probability = 1.118278e-01
Photon flux (15-150 keV) in 16.96 sec: 0.389701 ( -0.042438 0.042259 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.40846e-07 ( -6.58794e-08 6.68835e-08 ) ergs/cm2
Band function
Time interval is from -5.660 sec. to 11.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.735129 ( 0.817162 5.79767 )
beta : -2.00412 ( 2.00701 0.381694 )
Epeak [keV] : 46.1320 ( -46.4521 212.346 )
Norm@50keV : 1.21764E-02 ( -0.0124436 239.334 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.31 using 59 PHA bins.
# Reduced chi-squared = 1.242 for 55 degrees of freedom
# Null hypothesis probability = 1.072472e-01
Photon flux (15-150 keV) in 16.96 sec: 0.389075 ( 6.61092 -0.041848 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.43206e-07 ( -4.43087e-07 -6.177e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.2943 (-1.33249 1.55443)
R^2/D10^2 : 0.120240 (-0.0457004 0.0712262)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.19 using 59 PHA bins.
# Reduced chi-squared = 1.512 for 57 degrees of freedom
# Null hypothesis probability = 7.523202e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.461e-08 1.011e-08
25- 50 1.597e-07 2.172e-08
50-150 1.174e-07 2.850e-08
15-150 3.317e-07 4.859e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 113.093 (-38.6639 77.1569)
Norm : 1.70698 (-0.216488 0.277149)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.09 using 59 PHA bins.
# Reduced chi-squared = 1.212 for 57 degrees of freedom
# Null hypothesis probability = 1.308232e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.556e-08 1.153e-08
25- 50 1.338e-07 2.212e-08
50-150 2.317e-07 1.137e-07
15-150 4.410e-07 1.252e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.78887 (-2.52835 2.0652)
R1^2/D10^2 : 0.361681 (-0.190537 0.864895)
kT2 [keV] : 30.3255 (-13.2556 77.714)
R2^2/D10^2 : 2.18980E-03 (-0.00206938 0.0179327)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.08 using 59 PHA bins.
# Reduced chi-squared = 1.256 for 55 degrees of freedom
# Null hypothesis probability = 9.602219e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.123e-08 2.197e-08
25- 50 1.430e-07 5.006e-08
50-150 2.392e-07 1.287e-07
15-150 4.534e-07 1.957e-07
Peak spectrum fit
Power-law model
Time interval is from -0.200 sec. to 0.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57875 ( -0.388267 0.398889 )
Norm@50keV : 5.71449E-03 ( -0.00140446 0.00136422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.73 using 59 PHA bins.
# Reduced chi-squared = 1.223 for 57 degrees of freedom
# Null hypothesis probability = 1.199399e-01
Photon flux (15-150 keV) in 1 sec: 0.729587 ( -0.163181 0.163251 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.3586e-08 ( -1.39256e-08 1.43632e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.200 sec. to 0.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56008 ( -1.60025 0.57259 )
Epeak [keV] : 952.805 ( )
Norm@50keV : 5.85772E-03 ( -0.00154986 0.0526065 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.73 using 59 PHA bins.
# Reduced chi-squared = 1.245 for 56 degrees of freedom
# Null hypothesis probability = 1.026615e-01
Photon flux (15-150 keV) in 1 sec: 0.729434 ( -0.165715 0.163171 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.30775e-08 ( -1.59265e-08 1.48005e-08 ) ergs/cm2
Band function
Time interval is from -0.200 sec. to 0.800 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95825 ( -4.95825 -4.95825 )
beta : -1.82948 ( -0.708436 0.488178 )
Epeak [keV] : 25.6928 ( -25.6928 7.31968 )
Norm@50keV : 562.989 ( -123.066 3.62082e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.71 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 55 degrees of freedom
# Null hypothesis probability = 1.166261e-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] : 11.5298 (-3.19627 4.92621)
R^2/D10^2 : 0.206239 (-0.147991 0.465234)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.89 using 59 PHA bins.
# Reduced chi-squared = 1.331 for 57 degrees of freedom
# Null hypothesis probability = 4.786994e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.774e-09 2.766e-09
25- 50 1.732e-08 7.287e-09
50-150 1.347e-08 8.740e-09
15-150 3.656e-08 2.014e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 184.878 (-117.632 -182.163)
Norm : 2.98030 (-0.674526 0.954625)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.83 using 59 PHA bins.
# Reduced chi-squared = 1.225 for 57 degrees of freedom
# Null hypothesis probability = 1.183375e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.492e-09 4.353e-09
25- 50 1.428e-08 8.240e-09
50-150 3.053e-08 1.761e-08
15-150 5.230e-08 3.003e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.03224 (-2.61651 3.98445)
R1^2/D10^2 : 0.982667 (-0.770203 4.10054)
kT2 [keV] : 37.2736 (-20.9312 -37.2793)
R2^2/D10^2 : 2.84009E-03 (-0.00278207 0.0431718)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.16 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 55 degrees of freedom
# Null hypothesis probability = 1.095597e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.379e-09 4.797e-09
25- 50 1.441e-08 8.065e-09
50-150 3.303e-08 1.801e-08
15-150 5.582e-08 2.764e-08
Plot creation:
Mon Oct 20 21:24:36 EDT 2014