batgrbproduct Analysis for Trigger=637212
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 6 10:32:25 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger637212/GCN5_download_cron
======================================================================
Trigger: 00637212 Segment: 000
BAT Trigger Time: 449950520 [s; MET]
Trigger Stop: 449950904 [s; MET]
UTC: 2015-04-05T18:15:06.593640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.000130312016 Dec: -24.7719740367981 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.5
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.5
Flight Position: [ source = BAT ]
RA: 267.000130312016 Dec: -24.7719740367981 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 267.015877186714 Dec: -24.739768570152 [deg; J2000]
{ 17h 48m 03.8s , -24d 44' 23.2" }
+/- 3.4831231504237 [arcmin] (estimated 90% radius based on SNR)
+/- 2.23298691300354 [arcmin] (formal 1-sigma fit error)
SNR: 5.11537167757618
Angular difference between Flight and Ground position is 2.114244 arcmin
Partial Coding Fraction: 0.828125 [ including projection effects ]
Duration
T90: 384 +/-
Measured from: 0
to: 384 [s; relative to TRIGTIME]
T50: 384 +/-
Measured from: 0
to: 384 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 384 second)
Measured from: 0
to: 384 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 384 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.878404 0.713442 0.254332 0.015605
0.144277 0.130056 0.105031 0.087036 [error]
Peak 0.878404 0.713442 0.254332 0.015605
0.144277 0.130056 0.105031 0.087036 [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 2.52e-07 2.81e-07 2.25e-07 2.99e-07 8.68e-07 1.06e-06 erg/cm2
Error 6.37e-08 6.07e-08 9.24e-08 2.38e-07 2.15e-07 3.62e-07 erg/cm2
Peak flux Power-law 2.16e-02 1.34e-02 5.36e-03 2.89e-03 4.18e-02 4.32e-02 ph/cm2/s
Error 5.57e-03 2.81e-03 2.13e-03 2.14e-03 8.29e-03 8.65e-03 ph/cm2/s
Fluence Cutoff-PL 2.45e-07 3.11e-07 1.83e-07 4.66e-08 7.76e-07 7.86e-07 erg/cm2
Error 6.80e-08 8.54e-08 1.55e-07 2.75e-07 2.48e-07 4.13e-07 erg/cm2
Peak flux Cutoff-PL 2.08e-02 1.48e-02 4.52e-03 5.99e-04 4.06e-02 4.07e-02 ph/cm2/s
Error 6.01e-03 4.01e-03 3.66e-03 2.56e-03 8.51e-03 9.19e-03 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 2.323 0.414 - - 2.36e-04 7.13e-05 44.480 57
CPL 1.341 1.853 23.3 0.0 1.01e-03 0.00e+00 43.850 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.323 0.414 - - 2.36e-04 7.13e-05 44.480 57
CPL 1.341 1.852 23.3 0.0 1.01e-03 0.00e+00 43.850 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 384.000 0.000 384.000
T90 384.000 0.000 384.000
T50 384.000 0.000 384.000
Peak 384.000 0.000 384.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
267.0159 -24.7398 0.0375 18.9 -112.4 1.7030 5.1 TRIG_00637212
------------------------------------------
Foreground time interval of the image:
0.000 36.970 (delta_t = 36.970 [sec])
38.000 384.000 (delta_t = 346.000 [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
Multiple GTIs in the spectrum
tstart tstop
0.000000 36.970000
38.000000 384.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.32281 ( -0.386729 0.442127 )
Norm@50keV : 2.36215E-04 ( -7.20777e-05 7.04328e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.48 using 59 PHA bins.
# Reduced chi-squared = 0.7803 for 57 degrees of freedom
# Null hypothesis probability = 8.864973e-01
Photon flux (15-150 keV) in 383 sec: 4.18110E-02 ( -0.00828674 0.00828675 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.68284e-07 ( -2.096e-07 2.21294e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 36.970000
38.000000 384.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34118 ( -2.9769 0.728631 )
Epeak [keV] : 23.3330 ( )
Norm@50keV : 1.01494E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.85 using 59 PHA bins.
# Reduced chi-squared = 0.7831 for 56 degrees of freedom
# Null hypothesis probability = 8.807479e-01
Photon flux (15-150 keV) in 383 sec: 4.06424E-02 ( -0.0084177 0.0085933 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.75916e-07 ( -2.09041e-07 2.85994e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 36.970000
38.000000 384.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.16618 ( 0.418388 0.418388 )
beta : -2.72882 ( 2.64607 0.6195 )
Epeak [keV] : 24.5061 ( -23.5489 16.0495 )
Norm@50keV : 7.93377E-02 ( -0.0822471 35.1851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.10 using 59 PHA bins.
# Reduced chi-squared = 0.7836 for 55 degrees of freedom
# Null hypothesis probability = 8.777833e-01
Photon flux (15-150 keV) in 383 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] : 7.49337 (-1.54401 1.96165)
R^2/D10^2 : 6.01100E-02 (-0.0369469 0.0962797)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.68 using 59 PHA bins.
# Reduced chi-squared = 0.8190 for 57 degrees of freedom
# Null hypothesis probability = 8.335531e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.217e-07 9.008e-08
25- 50 3.452e-07 1.311e-07
50-150 7.274e-08 4.722e-08
15-150 6.396e-07 2.546e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.9637 (-14.3008 30.2899)
Norm : 0.286589 (-0.0954631 0.158069)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.84 using 59 PHA bins.
# Reduced chi-squared = 0.7692 for 57 degrees of freedom
# Null hypothesis probability = 8.994773e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.450e-07 7.160e-08
25- 50 3.112e-07 1.063e-07
50-150 2.203e-07 1.354e-07
15-150 7.765e-07 2.091e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.18446 (-3.87674 2.46013)
R1^2/D10^2 : 0.196454 (-0.144159 200.397)
kT2 [keV] : 14.4749 (-13.5614 -14.9791)
R2^2/D10^2 : 2.34726E-03 (-0.00200945 0.048186)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.42 using 59 PHA bins.
# Reduced chi-squared = 0.7895 for 55 degrees of freedom
# Null hypothesis probability = 8.703125e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.507e-07 1.392e-07
25- 50 3.029e-07 1.573e-07
50-150 2.209e-07 1.361e-07
15-150 7.745e-07 3.958e-07
Peak spectrum fit
Power-law model
Time interval is from 38.000 sec. to 384.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.32281 ( -0.386729 0.442127 )
Norm@50keV : 2.36215E-04 ( -7.20777e-05 7.04328e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.48 using 59 PHA bins.
# Reduced chi-squared = 0.7803 for 57 degrees of freedom
# Null hypothesis probability = 8.864973e-01
Photon flux (15-150 keV) in 383 sec: 4.18110E-02 ( -0.00828674 0.00828675 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.68284e-07 ( -2.096e-07 2.21294e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 38.000 sec. to 384.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34118 ( -2.9769 0.726783 )
Epeak [keV] : 23.3330 ( )
Norm@50keV : 1.01494E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.85 using 59 PHA bins.
# Reduced chi-squared = 0.7831 for 56 degrees of freedom
# Null hypothesis probability = 8.807479e-01
Photon flux (15-150 keV) in 383 sec: 4.06424E-02 ( -0.0084177 0.0085933 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.75916e-07 ( -2.09041e-07 2.85994e-07 ) ergs/cm2
Band function
Time interval is from 38.000 sec. to 384.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.16618 ( 0.418388 0.418388 )
beta : -2.72882 ( 2.64607 0.6195 )
Epeak [keV] : 24.5061 ( -23.5489 16.0907 )
Norm@50keV : 7.93377E-02 ( -0.0822471 33.2243 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.10 using 59 PHA bins.
# Reduced chi-squared = 0.7836 for 55 degrees of freedom
# Null hypothesis probability = 8.777833e-01
Photon flux (15-150 keV) in 383 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] : 7.49337 (-1.54401 1.96165)
R^2/D10^2 : 6.01100E-02 (-0.0369469 0.0962797)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.68 using 59 PHA bins.
# Reduced chi-squared = 0.8190 for 57 degrees of freedom
# Null hypothesis probability = 8.335531e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.217e-07 7.819e-08
25- 50 3.452e-07 1.325e-07
50-150 7.274e-08 4.735e-08
15-150 6.396e-07 2.244e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.9637 (-14.3008 30.2899)
Norm : 0.286589 (-0.0954631 0.158069)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.84 using 59 PHA bins.
# Reduced chi-squared = 0.7692 for 57 degrees of freedom
# Null hypothesis probability = 8.994773e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.450e-07 6.819e-08
25- 50 3.112e-07 9.092e-08
50-150 2.203e-07 1.323e-07
15-150 7.765e-07 2.627e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.18446 (-3.89022 2.42179)
R1^2/D10^2 : 0.196454 (-0.144159 200.397)
kT2 [keV] : 14.4749 (-14.9786 -14.9791)
R2^2/D10^2 : 2.34726E-03 (-0.00200945 0.048186)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.42 using 59 PHA bins.
# Reduced chi-squared = 0.7895 for 55 degrees of freedom
# Null hypothesis probability = 8.703125e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.507e-07 1.383e-07
25- 50 3.029e-07 1.611e-07
50-150 2.209e-07 1.289e-07
15-150 7.745e-07 3.855e-07
Plot creation:
Mon Apr 6 10:37:20 EDT 2015