batgrbproduct Analysis for Trigger=637807
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 Apr 13 12:08:23 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger637807/GCN5_download_cron
======================================================================
Trigger: 00637807 Segment: 000
BAT Trigger Time: 450520344 [s; MET]
Trigger Stop: 450520408 [s; MET]
UTC: 2015-04-12T08:32:10.564520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 273.35576922583 Dec: -33.9397380410332 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.87
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.87
Flight Position: [ source = BAT ]
RA: 273.35576922583 Dec: -33.9397380410332 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 273.365964205583 Dec: -33.9878512823157 [deg; J2000]
{ 18h 13m 27.8s , -33d 59' 16.3" }
+/- 3.81950879238324 [arcmin] (estimated 90% radius based on SNR)
+/- 2.24518764066176 [arcmin] (formal 1-sigma fit error)
SNR: 4.48413907928481
Angular difference between Flight and Ground position is 2.931036 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 64 +/- 0.064
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/- 0.064
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.204947 0.169337 0.005569 0.020917
0.054487 0.049146 0.040285 0.034441 [error]
Peak 0.204947 0.169337 0.005569 0.020917
0.054487 0.049146 0.040285 0.034441 [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 5.36e-08 5.26e-08 3.62e-08 3.92e-08 1.58e-07 1.81e-07 erg/cm2
Error 2.18e-08 2.23e-08 2.84e-08 6.63e-08 7.18e-08 1.09e-07 erg/cm2
Peak flux Power-law 2.76e-02 1.51e-02 5.20e-03 2.33e-03 4.92e-02 5.03e-02 ph/cm2/s
Error 1.15e-02 6.20e-03 3.95e-03 3.64e-03 1.76e-02 1.82e-02 ph/cm2/s
Fluence Cutoff-PL 4.99e-08 7.20e-08 1.91e-09 1.35e-14 1.24e-07 1.24e-07 erg/cm2
Error 2.52e-08 3.34e-08 1.22e-08 5.73e-10 4.55e-08 4.55e-08 erg/cm2
Peak flux Cutoff-PL 2.40e-02 2.21e-02 3.41e-04 1.24e-09 4.65e-02 4.65e-02 ph/cm2/s
Error 1.28e-02 9.46e-03 1.92e-03 4.89e-05 1.63e-02 1.63e-02 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 2.539 0.769 - - 2.44e-04 1.44e-04 64.690 57
CPL -6.391 0.000 27.3 5.7 4.30e+02 0.00e+00 59.650 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.539 0.769 - - 2.44e-04 1.44e-04 64.690 57
CPL -6.391 0.000 27.3 5.7 4.30e+02 0.00e+00 59.650 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
273.3660 -33.9879 0.0430 10.7 -30.4 0.4498 4.5 TRIG_00637807
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.53949 ( -0.672533 0.866053 )
Norm@50keV : 2.44427E-04 ( -0.000138928 0.000149427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.69 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.259949e-01
Photon flux (15-150 keV) in 64 sec: 4.92002E-02 ( -0.0176067 0.0176739 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5809e-07 ( -6.69696e-08 7.65638e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.39104 ( )
Epeak [keV] : 27.2863 ( -5.64415 5.77567 )
Norm@50keV : 430.400 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.65 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 56 degrees of freedom
# Null hypothesis probability = 3.445125e-01
Photon flux (15-150 keV) in 64 sec: 4.64697E-02 ( -0.0157021 0.0169694 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23879e-07 ( -4.23584e-08 4.85696e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98835 ( -5.13748 -4.98835 )
beta : -9.37116 ( 9.37116 19.3125 )
Epeak [keV] : 27.0607 ( -4.8257 5.86451 )
Norm@50keV : 45.7994 ( -14.7159 149.472 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.78 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.064053e-01
Photon flux (15-150 keV) in 64 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] : 6.62830 (-1.58632 2.04811)
R^2/D10^2 : 0.130769 (-0.13085 0.286995)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.74 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 57 degrees of freedom
# Null hypothesis probability = 3.427303e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.562e-08 3.392e-08
25- 50 6.836e-08 4.278e-08
50-150 9.261e-09 8.237e-09
15-150 1.332e-07 8.202e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 25.1316 (-12.0374 34.8316)
Norm : 0.479200 (-0.255097 0.553045)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.18 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 57 degrees of freedom
# Null hypothesis probability = 2.671798e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.636e-08 3.453e-08
25- 50 5.796e-08 3.651e-08
50-150 2.484e-08 2.192e-08
15-150 1.392e-07 8.800e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.357 ( )
R1^2/D10^2 : 1.18569E-06 (-1.27292e-06 0.400545)
kT2 [keV] : 6.54461 (-6.54081 2.0493)
R2^2/D10^2 : 0.136310 (-0.0874947 0.313014)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.74 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.56 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 55 degrees of freedom
# Reduced chi-squared = 1.101 for 55 degrees of freedom
# Null hypothesis probability = 2.767852e-01
# Null hypothesis probability = 2.822215e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.582e-08 1.289e+00
25- 50 6.815e-08 1.030e+01
50-150 9.118e-09 2.416e+02
15-150 1.331e-07 2.875e+02
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.53949 ( -0.672533 0.866053 )
Norm@50keV : 2.44427E-04 ( -0.000138928 0.000149427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.69 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.259949e-01
Photon flux (15-150 keV) in 64 sec: 4.92002E-02 ( -0.0176067 0.0176739 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5809e-07 ( -6.69696e-08 7.65638e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.39104 ( )
Epeak [keV] : 27.2863 ( -5.64415 5.77567 )
Norm@50keV : 430.400 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.65 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 56 degrees of freedom
# Null hypothesis probability = 3.445125e-01
Photon flux (15-150 keV) in 64 sec: 4.64697E-02 ( -0.0157022 0.0169694 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23879e-07 ( -4.23584e-08 4.85696e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98835 ( -5.13748 -4.98835 )
beta : -9.37116 ( 9.37116 19.3125 )
Epeak [keV] : 27.0607 ( -4.8257 5.86451 )
Norm@50keV : 45.7994 ( -14.7159 149.472 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.78 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.064053e-01
Photon flux (15-150 keV) in 64 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] : 6.62830 (-1.58632 2.04811)
R^2/D10^2 : 0.130769 (-0.13085 0.286995)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.74 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 57 degrees of freedom
# Null hypothesis probability = 3.427303e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.562e-08 3.315e-08
25- 50 6.836e-08 4.141e-08
50-150 9.261e-09 8.211e-09
15-150 1.332e-07 8.109e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 25.1316 (-12.0374 34.8316)
Norm : 0.479200 (-0.255097 0.553046)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.18 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 57 degrees of freedom
# Null hypothesis probability = 2.671798e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.636e-08 3.546e-08
25- 50 5.796e-08 3.754e-08
50-150 2.484e-08 2.169e-08
15-150 1.392e-07 8.826e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.357 ( )
R1^2/D10^2 : 1.18569E-06 (-1.27292e-06 0.400545)
kT2 [keV] : 6.54461 (-6.54081 2.0493)
R2^2/D10^2 : 0.136310 (-0.0874947 0.313014)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.74 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.56 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 55 degrees of freedom
# Reduced chi-squared = 1.101 for 55 degrees of freedom
# Null hypothesis probability = 2.767852e-01
# Null hypothesis probability = 2.822215e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.582e-08 1.118e+00
25- 50 6.815e-08 1.128e+01
50-150 9.118e-09 2.665e+02
15-150 1.331e-07 2.573e+02
Plot creation:
Mon Apr 13 12:12:42 EDT 2015