batgrbproduct Analysis for Trigger=637765
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): Sun Apr 12 16:20:42 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger637765/GCN5_download_cron
======================================================================
Trigger: 00637765 Segment: 000
BAT Trigger Time: 450473798.656 [s; MET]
Trigger Stop: 450473799.168 [s; MET]
UTC: 2015-04-11T19:36:25.222900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 272.073350856765 Dec: -36.9744830883773 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.96
Image Trigger?: NO
Rate S/N Ratio: 13.490737563232 [ if not an image trigger ]
Image S/N Ratio: 8.96
Flight Position: [ source = BAT ]
RA: 272.073350856765 Dec: -36.9744830883773 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.116833322519 Dec: -36.9522631138317 [deg; J2000]
{ 18h 08m 28.0s , -36d 57' 08.1" }
+/- 1.23823700453539 [arcmin] (estimated 90% radius based on SNR)
+/- 0.457253341034054 [arcmin] (formal 1-sigma fit error)
SNR: 22.4151450351426
Angular difference between Flight and Ground position is 2.474466 arcmin
Partial Coding Fraction: 1.03125 [ including projection effects ]
Duration
T90: 22.0000000596046 +/- 6.680665880261
Measured from: -0.00799989700317383
to: 21.9920001626015 [s; relative to TRIGTIME]
T50: 5.53600007295609 +/- 1.3357844099453
Measured from: 2.42400008440018
to: 7.96000015735626 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.54799997806549
to: 6.54799997806549 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.728000044822693
to: 28.6159999966621 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.960227 0.168890 0.063713 0.017988
0.038376 0.032613 0.026817 0.023695 [error]
Peak 0.128886 0.025569 0.002886 0.004667
0.008384 0.006366 0.005001 0.004503 [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 2.83e-07 7.88e-08 1.18e-08 2.00e-09 3.75e-07 3.76e-07 erg/cm2
Error 3.14e-08 1.68e-08 5.91e-09 1.77e-09 3.84e-08 3.86e-08 erg/cm2
Peak flux Power-law 1.24e+00 2.32e-01 2.10e-02 2.07e-03 1.50e+00 1.50e+00 ph/cm2/s
Error 1.73e-01 6.04e-02 1.26e-02 2.53e-03 1.96e-01 1.96e-01 ph/cm2/s
Fluence Cutoff-PL 2.88e-07 6.44e-08 1.19e-09 5.13e-13 3.53e-07 3.53e-07 erg/cm2
Error 3.28e-08 2.19e-08 7.50e-09 1.07e-09 3.96e-08 3.95e-08 erg/cm2
Peak flux Cutoff-PL 1.29e+00 1.87e-01 1.15e-03 4.56e-08 1.48e+00 1.48e+00 ph/cm2/s
Error 1.89e-01 8.38e-02 1.32e-02 1.49e-03 1.96e-01 1.96e-01 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 4.742 0.426 - - 3.23e-04 1.27e-04 66.980 57
CPL 1.000 0.000 50.0 0.0 3.72e-03 0.00e+00 230.920 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.464 0.505 - - 1.60e-03 7.73e-04 56.720 57
CPL 1.000 0.000 50.0 0.0 1.52e-02 0.00e+00 156.930 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 29.344 -0.728 28.616
T90 22.000 -0.008 21.992
T50 5.536 2.424 7.960
Peak 1.000 5.548 6.548
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.1168 -36.9523 0.0085 6.0 -44.8 0.9645 22.4 TRIG_00637765
------------------------------------------
Foreground time interval of the image:
-0.728 9.745 (delta_t = 10.473 [sec])
Background time interval of the image:
-51.355 -0.728 (delta_t = 50.627 [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 -0.728 sec. to 28.616 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.74237 ( -0.412317 0.439396 )
Norm@50keV : 3.22974E-04 ( -0.000110623 0.00014402 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.98 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 57 degrees of freedom
# Null hypothesis probability = 1.718458e-01
Photon flux (15-150 keV) in 29.34 sec: 0.390588 ( -0.0397256 0.0397765 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.75182e-07 ( -3.83509e-08 3.85419e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.728 sec. to 28.616 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.72316E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 230.92 using 59 PHA bins.
# Reduced chi-squared = 4.1235 for 56 degrees of freedom
# Null hypothesis probability = 4.167750e-23
Photon flux (15-150 keV) in 29.34 sec: 0.381169 ( -0.041427 0.041077 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.53224e-07 ( -3.82887e-08 4.08824e-08 ) ergs/cm2
Band function
Time interval is from -0.728 sec. to 28.616 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48350 ( )
beta : -7.64029 ( )
Epeak [keV] : 34.8691 ( )
Norm@50keV : 2.90500E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 206.74 using 59 PHA bins.
# Reduced chi-squared = 3.7590 for 55 degrees of freedom
# Null hypothesis probability = 1.974293e-19
Photon flux (15-150 keV) in 29.34 sec: 0.252186 ( ) 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] : 3.22796 (-0.304147 0.343467)
R^2/D10^2 : 33.6424 (-16.0738 31.5639)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.59 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 57 degrees of freedom
# Null hypothesis probability = 1.804682e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.868e-07 6.041e-08
25- 50 5.360e-08 1.345e-08
50-150 1.531e-10 1.107e-10
15-150 3.405e-07 7.579e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.59670 (-0.96252 1.20762)
Norm : 36.2396 (-14.0714 24.1225)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.98 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 57 degrees of freedom
# Null hypothesis probability = 2.186482e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.877e-07 5.019e-08
25- 50 6.416e-08 1.681e-08
50-150 1.136e-09 7.847e-10
15-150 3.530e-07 6.116e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.15957 (-0.310354 0.344873)
R1^2/D10^2 : 38.1316 (-18.5468 36.5144)
kT2 [keV] : 39.8500 (-27.079 -39.8495)
R2^2/D10^2 : 2.07174E-04 (-0.000195659 0.00630856)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.58 using 59 PHA bins.
# Reduced chi-squared = 1.120 for 55 degrees of freedom
# Null hypothesis probability = 2.523115e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.878e-07 7.620e-08
25- 50 5.838e-08 1.698e-08
50-150 8.108e-08 5.389e-08
15-150 4.272e-07 1.073e-07
Peak spectrum fit
Power-law model
Time interval is from 5.548 sec. to 6.548 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.46412 ( -0.477343 0.533482 )
Norm@50keV : 1.60157E-03 ( -0.000663145 0.000881949 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.72 using 59 PHA bins.
# Reduced chi-squared = 0.9951 for 57 degrees of freedom
# Null hypothesis probability = 4.855257e-01
Photon flux (15-150 keV) in 1 sec: 1.49653 ( -0.196381 0.196392 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.03991e-08 ( -7.18359e-09 7.34504e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.548 sec. to 6.548 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.52077E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 156.93 using 59 PHA bins.
# Reduced chi-squared = 2.8022 for 56 degrees of freedom
# Null hypothesis probability = 1.667125e-11
Photon flux (15-150 keV) in 1 sec: 1.47842 ( -0.19578 0.19537 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.70478e-08 ( -6.5552e-09 7.1447e-09 ) ergs/cm2
Band function
Time interval is from 5.548 sec. to 6.548 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.36885 ( 6.36885 6.36885 )
beta : -4.46409 ( -0.532563 0.477329 )
Epeak [keV] : 3.02812 ( -3.02812 -3.02812 )
Norm@50keV : 0.217681 ( -0.0901361 0.119864 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.72 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 55 degrees of freedom
# Null hypothesis probability = 4.106736e-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] : 3.31363 (-0.386777 0.444892)
R^2/D10^2 : 113.763 (-60.7433 136.085)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.70 using 59 PHA bins.
# Reduced chi-squared = 0.9597 for 57 degrees of freedom
# Null hypothesis probability = 5.616805e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.844e-08 1.205e-08
25- 50 7.828e-09 2.911e-09
50-150 2.716e-11 2.190e-11
15-150 4.629e-08 1.644e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.14838 (-1.33938 1.79417)
Norm : 113.257 (-49.7386 94.9422)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.56 using 59 PHA bins.
# Reduced chi-squared = 0.9573 for 57 degrees of freedom
# Null hypothesis probability = 5.669927e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.768e-08 9.520e-09
25- 50 9.703e-09 3.751e-09
50-150 2.321e-10 1.924e-10
15-150 4.762e-08 1.194e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.28897 (-0.388945 0.438211)
R1^2/D10^2 : 118.562 (-54.7209 145.285)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 3.78934E-05 (-3.78904e-05 -3.78904e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.87 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.85 using 59 PHA bins.
# Reduced chi-squared = 0.9613 for 55 degrees of freedom
# Reduced chi-squared = 0.9610 for 55 degrees of freedom
# Null hypothesis probability = 5.564120e-01
# Null hypothesis probability = 5.571216e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.841e-08 1.137e-08
25- 50 8.128e-09 3.057e-09
50-150 1.006e-08 4.901e-09
15-150 5.660e-08 1.720e-08
Plot creation:
Sun Apr 12 16:24:58 EDT 2015