batgrbproduct Analysis for Trigger=639278
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): Wed Apr 29 07:44:39 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger639278/GCN5_download_cron
======================================================================
Trigger: 00639278 Segment: 000
BAT Trigger Time: 451883537.024 [s; MET]
Trigger Stop: 451883539.072 [s; MET]
UTC: 2015-04-28T03:12:03.518520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 292.654499855063 Dec: 4.11579888955815 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.45
Image Trigger?: NO
Rate S/N Ratio: 10.2469507659596 [ if not an image trigger ]
Image S/N Ratio: 7.45
Flight Position: [ source = BAT ]
RA: 292.654499855063 Dec: 4.11579888955815 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 292.661498520148 Dec: 4.11450756941834 [deg; J2000]
{ 19h 30m 38.8s , +04d 06' 52.2" }
+/- 1.30805731912952 [arcmin] (estimated 90% radius based on SNR)
+/- 0.553353761117654 [arcmin] (formal 1-sigma fit error)
SNR: 20.7256758318826
Angular difference between Flight and Ground position is 0.425943 arcmin
Partial Coding Fraction: 0.4023438 [ including projection effects ]
Duration
T90: 130.827999949455 +/- 15.6676539154299
Measured from: -34.4719998836517
to: 96.3560000658035 [s; relative to TRIGTIME]
T50: 61.9239999651909 +/- 4.01896357086962
Measured from: 0.892000138759613
to: 62.8160001039505 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.36000001430511
to: 2.36000001430511 [s; relative to TRIGTIME]
Total Fluence
Measured from: -40.0600000023842
to: 121.727999985218 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.857590 2.547260 1.547455 0.315469
0.129967 0.118221 0.096907 0.078387 [error]
Peak 0.028931 0.073271 0.054368 0.019095
0.012714 0.012301 0.010222 0.007634 [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 7.67e-07 1.13e-06 1.24e-06 2.55e-06 3.91e-06 5.69e-06 erg/cm2
Error 7.11e-08 6.51e-08 9.64e-08 4.12e-07 2.32e-07 4.96e-07 erg/cm2
Peak flux Power-law 4.56e-01 4.89e-01 3.72e-01 4.63e-01 1.49e+00 1.78e+00 ph/cm2/s
Error 1.68e-01 1.14e-01 8.05e-02 2.01e-01 3.18e-01 3.50e-01 ph/cm2/s
Fluence Cutoff-PL 6.67e-07 1.22e-06 1.27e-06 8.53e-07 3.68e-06 4.02e-06 erg/cm2
Error 8.54e-08 8.26e-08 1.09e-07 4.55e-07 2.59e-07 5.18e-07 erg/cm2
Peak flux Cutoff-PL 3.35e-01 5.26e-01 4.26e-01 1.79e-01 1.41e+00 1.47e+00 ph/cm2/s
Error 1.91e-01 1.36e-01 1.02e-01 2.47e-01 3.24e-01 3.85e-01 ph/cm2/s
Fluence Band 6.54e-07 1.23e-06 1.25e-06 1.33e-06 3.69e-06 4.47e-06 erg/cm2
Error 6.96e-08 9.64e-08 1.30e-07 -------- 2.62e-07 -------- erg/cm2
Peak flux Band 3.60e-01 5.12e-01 4.20e-01 2.41e-01 1.44e+00 1.54e+00 ph/cm2/s
Error -------- -------- 9.92e-02 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.866 0.099 - - 2.63e-03 1.56e-04 49.430 57
CPL 0.998 0.472 55.2 9.7 7.40e-03 4.45e-03 37.350 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.392 0.318 - - 1.23e-02 2.42e-03 55.770 57
CPL 0.116 1.571 81.2 1454.3 4.76e-02 1.65e-01 53.000 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: 111.680000 sec.
T50 in the 50-300 keV band: 26.112000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 161.788 -40.060 121.728
T90 130.828 -34.472 96.356
T50 61.924 0.892 62.816
Peak 1.000 1.360 2.360
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
292.6615 +4.1145 0.0093 43.6 -154.6 4.1254 20.7 TRIG_00639278
------------------------------------------
Foreground time interval of the image:
-40.060 27.877 (delta_t = 67.937 [sec])
Background time interval of the image:
-239.024 -40.060 (delta_t = 198.964 [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 -40.060 sec. to 121.728 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86571 ( -0.0982042 0.0995054 )
Norm@50keV : 2.63079E-03 ( -0.000156129 0.000155384 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.43 using 59 PHA bins.
# Reduced chi-squared = 0.8673 for 57 degrees of freedom
# Null hypothesis probability = 7.515718e-01
Photon flux (15-150 keV) in 161.8 sec: 0.372169 ( -0.0222308 0.0223028 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.91326e-06 ( -2.32081e-07 2.32856e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -40.060 sec. to 121.728 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.997902 ( -0.497994 0.446088 )
Epeak [keV] : 55.1986 ( -7.02069 12.2988 )
Norm@50keV : 7.40413E-03 ( -0.00301038 0.00589843 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.35 using 59 PHA bins.
# Reduced chi-squared = 0.6670 for 56 degrees of freedom
# Null hypothesis probability = 9.739598e-01
Photon flux (15-150 keV) in 161.8 sec: 0.354959 ( -0.023705 0.023779 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.67951e-06 ( -2.58524e-07 2.60255e-07 ) ergs/cm2
Band function
Time interval is from -40.060 sec. to 121.728 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.891134 ( -0.522438 2.95597 )
beta : -2.62393 ( 2.61917 0.619531 )
Epeak [keV] : 52.8756 ( -20.7361 13.0898 )
Norm@50keV : 8.56154E-03 ( -0.00405653 0.941291 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.89 using 59 PHA bins.
# Reduced chi-squared = 0.6708 for 55 degrees of freedom
# Null hypothesis probability = 9.711498e-01
Photon flux (15-150 keV) in 161.8 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.68729e-06 ( -3.68616e-06 -2.56793e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.4528 (-0.78271 0.83757)
R^2/D10^2 : 7.62615E-02 (-0.0169139 0.0215919)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.64 using 59 PHA bins.
# Reduced chi-squared = 1.467 for 57 degrees of freedom
# Null hypothesis probability = 1.232143e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.056e-07 4.522e-08
25- 50 1.332e-06 9.117e-08
50-150 1.272e-06 1.438e-07
15-150 3.010e-06 1.909e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 91.6695 (-15.4749 21.1319)
Norm : 1.67321 (-0.141665 0.157005)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.48 using 59 PHA bins.
# Reduced chi-squared = 0.6751 for 57 degrees of freedom
# Null hypothesis probability = 9.715708e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.068e-07 7.394e-08
25- 50 1.200e-06 7.006e-08
50-150 1.848e-06 5.623e-07
15-150 3.755e-06 5.517e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.93725 (-1.44567 1.59617)
R1^2/D10^2 : 0.422059 (-0.198064 0.502796)
kT2 [keV] : 20.2781 (-3.5377 6.68388)
R2^2/D10^2 : 8.45125E-03 (-0.00590701 0.00789465)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.68 using 59 PHA bins.
# Reduced chi-squared = 0.6851 for 55 degrees of freedom
# Null hypothesis probability = 9.640781e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.308e-07 1.635e-07
25- 50 1.246e-06 2.727e-07
50-150 1.768e-06 6.055e-07
15-150 3.644e-06 1.070e-06
Peak spectrum fit
Power-law model
Time interval is from 1.360 sec. to 2.360 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39248 ( -0.321979 0.314807 )
Norm@50keV : 1.22762E-02 ( -0.00242087 0.00241462 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.77 using 59 PHA bins.
# Reduced chi-squared = 0.9784 for 57 degrees of freedom
# Null hypothesis probability = 5.213105e-01
Photon flux (15-150 keV) in 1 sec: 1.49255 ( -0.315989 0.320237 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18804e-07 ( -2.40444e-08 2.416e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.360 sec. to 2.360 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.115802 ( -1.83534 1.3065 )
Epeak [keV] : 81.2255 ( -23.8282 2884.79 )
Norm@50keV : 4.76404E-02 ( -0.0476401 0.28334 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.00 using 59 PHA bins.
# Reduced chi-squared = 0.9464 for 56 degrees of freedom
# Null hypothesis probability = 5.891931e-01
Photon flux (15-150 keV) in 1 sec: 1.41234 ( -0.31943 0.32822 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1297e-07 ( -2.54606e-08 2.5348e-08 ) ergs/cm2
Band function
Time interval is from 1.360 sec. to 2.360 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.84861 ( -13.3965 -4.84861 )
beta : -1.92425 ( -0.836303 0.520077 )
Epeak [keV] : 41.4788 ( -13.8695 9.61977 )
Norm@50keV : 50.7841 ( -9.69059 444.252 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.65 using 59 PHA bins.
# Reduced chi-squared = 0.9392 for 55 degrees of freedom
# Null hypothesis probability = 6.032215e-01
Photon flux (15-150 keV) in 1 sec: 1.43998 ( ) 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] : 17.2721 (-3.61116 4.86618)
R^2/D10^2 : 0.110807 (-0.0648102 0.144682)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.34 using 59 PHA bins.
# Reduced chi-squared = 0.9709 for 57 degrees of freedom
# Null hypothesis probability = 5.374901e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.702e-09 2.937e-09
25- 50 3.003e-08 1.164e-08
50-150 6.428e-08 2.587e-08
15-150 1.010e-07 4.022e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-85.598 -199.363)
Norm : 6.35223 (-1.24474 1.24481)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.46 using 59 PHA bins.
# Reduced chi-squared = 0.9729 for 57 degrees of freedom
# Null hypothesis probability = 5.331571e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.582e-08 9.260e-09
25- 50 3.043e-08 1.724e-08
50-150 6.673e-08 3.853e-08
15-150 1.130e-07 6.345e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.80518 (-9.80022 7.47663)
R1^2/D10^2 : 0.439840 (-0.393734 4.32692)
kT2 [keV] : 27.5520 (-12.811 -27.5153)
R2^2/D10^2 : 1.52782E-02 (-0.0153335 0.102351)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.20 using 59 PHA bins.
# Reduced chi-squared = 0.9492 for 55 degrees of freedom
# Null hypothesis probability = 5.821101e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.046e-08 6.350e-09
25- 50 3.202e-08 2.043e-08
50-150 7.280e-08 4.031e-08
15-150 1.153e-07 6.015e-08
Plot creation:
Wed Apr 29 07:48:46 EDT 2015