batgrbproduct Analysis for Trigger=641698
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): Thu May 28 13:56:34 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger641698/GCN5_download_cron
======================================================================
Trigger: 00641698 Segment: 000
BAT Trigger Time: 454402149.44 [s; MET]
Trigger Stop: 454402149.952 [s; MET]
UTC: 2015-05-27T06:48:55.804620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 288.957781485581 Dec: 4.19407695074873 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.07
Image Trigger?: NO
Rate S/N Ratio: 16.0312195418814 [ if not an image trigger ]
Image S/N Ratio: 9.07
Flight Position: [ source = BAT ]
RA: 288.957781485581 Dec: 4.19407695074873 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 288.962314140381 Dec: 4.19494559533076 [deg; J2000]
{ 19h 15m 51.0s , +04d 11' 41.8" }
+/- 0.865715541560236 [arcmin] (estimated 90% radius based on SNR)
+/- 0.264702750739714 [arcmin] (formal 1-sigma fit error)
SNR: 37.375099693265
Angular difference between Flight and Ground position is 0.276193 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 112 +/- 80
Measured from: -111.439999878407
to: 0.560000121593475 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: -31.4399998784065
to: -15.4399998784065 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -7.93999999761581
to: -6.93999999761581 [s; relative to TRIGTIME]
Total Fluence
Measured from: -111.439999997616
to: 16.5600000023842 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.677599 2.282061 1.309661 0.224715
0.089288 0.090703 0.082411 0.080443 [error]
Peak 0.012631 0.021741 0.002579 -0.007177
0.007191 0.007099 0.006063 0.005915 [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 5.21e-07 8.52e-07 1.05e-06 2.58e-06 3.16e-06 5.01e-06 erg/cm2
Error 4.43e-08 4.36e-08 8.08e-08 4.22e-07 1.87e-07 4.89e-07 erg/cm2
Peak flux Power-law 1.67e-01 1.03e-01 4.10e-02 2.19e-02 3.23e-01 3.33e-01 ph/cm2/s
Error 9.47e-02 7.88e-02 4.23e-02 4.21e-02 1.57e-01 1.67e-01 ph/cm2/s
Fluence Cutoff-PL 5.00e-07 8.78e-07 1.06e-06 1.54e-06 3.05e-06 3.98e-06 erg/cm2
Error 5.15e-08 5.45e-08 8.48e-08 9.43e-07 2.28e-07 7.01e-07 erg/cm2
Peak flux Cutoff-PL 1.29e-01 1.59e-01 2.05e-02 6.51e-05 3.09e-01 3.09e-01 ph/cm2/s
Error 1.07e-01 1.24e-01 3.75e-02 2.31e-02 1.52e-01 1.52e-01 ph/cm2/s
Fluence Band 4.73e-07 9.00e-07 1.02e-06 2.17e-06 3.06e-06 4.58e-06 erg/cm2
Error -------- -------- 8.70e-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 1.693 0.097 - - 2.66e-03 1.47e-04 51.160 57
CPL 1.392 0.375 93.0 -31.3 3.85e-03 1.87e-03 49.280 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.331 1.057 - - 1.81e-03 1.33e-03 42.850 57
CPL -1.873 0.000 32.5 0.0 8.40e-01 0.00e+00 40.870 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: 107.520000 sec.
T50 in the 50-300 keV band: 55.616000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 128.000 -111.440 16.560
T90 112.000 -111.440 0.560
T50 16.000 -31.440 -15.440
Peak 1.000 -7.940 -6.940
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
288.9623 +4.1949 0.0051 10.3 -91.8 4.5512 37.4 TRIG_00641698
------------------------------------------
Foreground time interval of the image:
-44.139 8.661 (delta_t = 52.800 [sec])
Background time interval of the image:
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 -111.440 sec. to 16.560 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69252 ( -0.0967089 0.0978532 )
Norm@50keV : 2.66234E-03 ( -0.000147874 0.000146793 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.16 using 59 PHA bins.
# Reduced chi-squared = 0.8975 for 57 degrees of freedom
# Null hypothesis probability = 6.928621e-01
Photon flux (15-150 keV) in 128 sec: 0.352670 ( -0.0181216 0.0181417 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.15712e-06 ( -1.85618e-07 1.8745e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -111.440 sec. to 16.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39225 ( -0.409826 0.34098 )
Epeak [keV] : 93.0325 ( -30.4073 -93.0328 )
Norm@50keV : 3.84985E-03 ( -0.00126558 0.00246672 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.28 using 59 PHA bins.
# Reduced chi-squared = 0.8800 for 56 degrees of freedom
# Null hypothesis probability = 7.252876e-01
Photon flux (15-150 keV) in 128 sec: 0.346099 ( -0.019789 0.019775 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.04997e-06 ( -2.27571e-07 2.28685e-07 ) ergs/cm2
Band function
Time interval is from -111.440 sec. to 16.560 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.149687 ( -1.16151 4.61642 )
beta : -1.83478 ( 1.82903 0.154354 )
Epeak [keV] : 35.8855 ( -19.1105 38.4577 )
Norm@50keV : 4.47132E-02 ( -0.0442506 47.3622 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.64 using 59 PHA bins.
# Reduced chi-squared = 0.8480 for 55 degrees of freedom
# Null hypothesis probability = 7.814694e-01
Photon flux (15-150 keV) in 128 sec: 0.342541 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.05691e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2059 ( )
R^2/D10^2 : 7.75909E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 125.40 using 59 PHA bins.
# Reduced chi-squared = 2.2000 for 57 degrees of freedom
# Null hypothesis probability = 4.767341e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.133e-07 3.258e-08
25- 50 1.006e-06 6.157e-08
50-150 9.112e-07 1.139e-07
15-150 2.230e-06 1.440e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 132.902 (-30.001 41.0765)
Norm : 1.46193 (-0.0907069 0.111251)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.42 using 59 PHA bins.
# Reduced chi-squared = 0.8671 for 57 degrees of freedom
# Null hypothesis probability = 7.519409e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.849e-07 4.006e-08
25- 50 8.823e-07 7.712e-08
50-150 1.653e-06 5.337e-07
15-150 3.020e-06 5.517e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.21328 (-1.07169 1.11797)
R1^2/D10^2 : 0.374641 (-0.132497 0.243363)
kT2 [keV] : 26.5912 (-5.36082 9.17738)
R2^2/D10^2 : 3.34886E-03 (-0.00200531 0.00403323)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.61 using 59 PHA bins.
# Reduced chi-squared = 0.8474 for 55 degrees of freedom
# Null hypothesis probability = 7.824110e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.640e-07 9.690e-08
25- 50 8.969e-07 1.571e-07
50-150 1.654e-06 7.224e-07
15-150 3.015e-06 9.478e-07
Peak spectrum fit
Power-law model
Time interval is from -7.940 sec. to -6.940 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.33084 ( -0.836547 1.27727 )
Norm@50keV : 1.81411E-03 ( -0.00130791 0.00136024 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.85 using 59 PHA bins.
# Reduced chi-squared = 0.7517 for 57 degrees of freedom
# Null hypothesis probability = 9.178315e-01
Photon flux (15-150 keV) in 1 sec: 0.322509 ( -0.156446 0.158122 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74201e-08 ( -9.9257e-09 1.17674e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.940 sec. to -6.940 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.87257 ( )
Epeak [keV] : 32.4944 ( )
Norm@50keV : 0.840314 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.87 using 59 PHA bins.
# Reduced chi-squared = 0.7298 for 56 degrees of freedom
# Null hypothesis probability = 9.356188e-01
Photon flux (15-150 keV) in 1 sec: 0.308870 ( -0.150657 0.15279 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47915e-08 ( -7.46021e-09 9.5898e-09 ) ergs/cm2
Band function
Time interval is from -7.940 sec. to -6.940 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.47190 ( -10.3912 -1.5749 )
beta : -10.0000 ( 10 4.26326e-14 )
Epeak [keV] : 32.5587 ( -14.5177 184.275 )
Norm@50keV : 8.97414 ( -6.19333 247.37 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.83 using 59 PHA bins.
# Reduced chi-squared = 0.7424 for 55 degrees of freedom
# Null hypothesis probability = 9.226192e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.27945e-16 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.30808 (-2.88548 4.12768)
R^2/D10^2 : 0.347220 (-0.347235 1.48358)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.87 using 59 PHA bins.
# Reduced chi-squared = 0.7171 for 57 degrees of freedom
# Null hypothesis probability = 9.471819e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.451e-09 2.919e-09
25- 50 8.309e-09 5.445e-09
50-150 2.467e-09 1.961e-09
15-150 1.523e-08 1.008e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.0382 (-22.7817 125.458)
Norm : 2.33591 (-1.37165 3.67569)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.94 using 59 PHA bins.
# Reduced chi-squared = 0.7358 for 57 degrees of freedom
# Null hypothesis probability = 9.324760e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.164e-09 3.520e-09
25- 50 6.481e-09 4.267e-09
50-150 4.455e-09 4.192e-09
15-150 1.610e-08 1.187e-08
Double BB
R1^2/D10^2 : 7.35306E+05 ( )
kT2 [keV] : 8.81578 (-3.11011 4.83103)
R2^2/D10^2 : 0.260329 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.75 using 59 PHA bins.
#Fit statistic : Chi-Squared = 40.12 using 59 PHA bins.
#Fit statistic : Chi-Squared = 40.09 using 59 PHA bins.
# Reduced chi-squared = 0.7409 for 55 degrees of freedom
# Reduced chi-squared = 0.7294 for 55 degrees of freedom
# Reduced chi-squared = 0.7289 for 55 degrees of freedom
# Null hypothesis probability = 9.240599e-01
# Null hypothesis probability = 9.340780e-01
# Null hypothesis probability = 9.345308e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.449e-09 2.870e-09
25- 50 8.042e-09 5.255e-09
50-150 2.396e-09 1.970e-09
15-150 1.489e-08 1.070e-08
Plot creation:
Thu May 28 14:01:09 EDT 2015