batgrbproduct Analysis for Trigger=502742
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): Sat Sep 10 04:49:58 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger502742/GCN5_download_cron
======================================================================
Trigger: 00502742 Segment: 000
BAT Trigger Time: 337235112 [s; MET]
Trigger Stop: 337235176 [s; MET]
UTC: 2011-09-09T04:25:04.653980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 195.309331042349 Dec: -61.6099750404551 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 17.83
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 17.83
Flight Position: [ source = BAT ]
RA: 195.309331042349 Dec: -61.6099750404551 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 195.377417041468 Dec: -61.5632398086167 [deg; J2000]
{ 13h 01m 30.6s , -61d 33' 47.7" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 12.0689379572445 [arcmin] (formal 1-sigma fit error)
SNR: -0.852499565026097
Angular difference between Flight and Ground position is 3.411974 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 253.591999948025 +/- 543.878639591894
Measured from: 372.712000131607
to: 626.304000079632 [s; relative to TRIGTIME]
T50: 173.547999978065 +/- 48.7369016960147
Measured from: 403.932000100613
to: 577.480000078678 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 376.072000026703
to: 377.072000026703 [s; relative to TRIGTIME]
Total Fluence
Measured from: -169.927999973297
to: 646.092000007629 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 9.933245 6.907694 0.586302 -0.060542
0.153366 0.149635 0.127401 0.115896 [error]
Peak 0.032184 0.022655 0.010357 0.005046
0.005566 0.005426 0.004437 0.004001 [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 3.55e-06 2.76e-06 1.44e-06 1.09e-06 8.24e-06 8.83e-06 erg/cm2
Error 3.38e-07 2.75e-07 2.96e-07 4.02e-07 7.73e-07 9.58e-07 erg/cm2
Peak flux Power-law 2.78e-01 1.80e-01 7.53e-02 4.30e-02 5.55e-01 5.77e-01 ph/cm2/s
Error 7.91e-02 4.33e-02 3.39e-02 3.60e-02 1.25e-01 1.33e-01 ph/cm2/s
Fluence Cutoff-PL 2.94e-06 2.89e-06 3.71e-07 1.97e-09 6.20e-06 6.20e-06 erg/cm2
Error 2.45e-07 1.20e-07 8.94e-08 2.74e-09 3.03e-07 3.03e-07 erg/cm2
Peak flux Cutoff-PL 2.72e-01 1.93e-01 7.06e-02 1.72e-02 5.48e-01 5.53e-01 ph/cm2/s
Error 8.39e-02 5.80e-02 5.47e-02 4.23e-02 1.25e-01 1.39e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.241 0.000 - - 6.90e-04 0.00e+00 174.680 57
CPL 1.000 0.000 50.0 0.0 2.72e-03 0.00e+00 791.880 56
The chi2 of BB fit is 57.34 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.257 0.465 - - 3.25e-03 1.12e-03 44.360 57
CPL 1.696 1.419 19.9 0.0 7.36e-03 0.00e+00 44.070 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 816.020 -169.928 646.092
T90 253.592 372.712 626.304
T50 173.548 403.932 577.480
Peak 1.000 376.072 377.072
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
195.3774 -61.5632 0.2252 15.9 15.2 -0.8656 -0.9 TRIG_00502742
------------------------------------------
Foreground time interval of the image:
-169.928 -56.748 (delta_t = 113.180 [sec])
-56.000 4.000 (delta_t = 60.000 [sec])
5.000 215.750 (delta_t = 210.750 [sec])
217.000 646.092 (delta_t = 429.092 [sec])
Background time interval of the image:
-239.000 -184.230 (delta_t = 54.770 [sec])
-183.000 -169.928 (delta_t = 13.072 [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
Multiple GTIs in the spectrum
tstart tstop
-169.928000 -56.747600
-56.000000 4.000000
5.000000 215.750000
217.000000 646.092000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.24141 ( )
Norm@50keV : 6.90251E-04 ( )
------------------------------------------------------------
# Chi-Squared = 174.68 using 59 PHA bins.
# Reduced chi-squared = 3.0646 for 57 degrees of freedom
# Null hypothesis probability = 7.144025e-14
Photon flux (15-150 keV) in 813 sec: 0.228153 ( -0.0182807 0.0182829 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.23984e-06 ( -7.63044e-07 7.8256e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-169.928000 -56.747600
-56.000000 4.000000
5.000000 215.750000
217.000000 646.092000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.71510E-03 ( )
------------------------------------------------------------
# Chi-Squared = 791.88 using 59 PHA bins.
# Reduced chi-squared = 14.141 for 56 degrees of freedom
# Null hypothesis probability = 1.492906e-130
Photon flux (15-150 keV) in 813 sec: 0.189460 ( -0.010817 0.010939 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.19881e-06 ( -3.00696e-07 3.05005e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-169.928000 -56.747600
-56.000000 4.000000
5.000000 215.750000
217.000000 646.092000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.926489 ( -0.806483 0.940902 )
beta : -6.30693 ( 5.42915 0.484541 )
Epeak [keV] : 22.5426 ( -2.41411 1.48668 )
Norm@50keV : 0.358887 ( -0.361602 1.13998 )
------------------------------------------------------------
# Chi-Squared = 54.48 using 59 PHA bins.
# Reduced chi-squared = 0.9906 for 55 degrees of freedom
# Null hypothesis probability = 4.944322e-01
Photon flux (15-150 keV) in 813 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] : 6.16625 (-0.195084 0.201432)
R^2/D10^2 : 0.647640 (-0.0967389 0.114233)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 57.34 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 57 degrees of freedom
# Null hypothesis probability = 4.625568e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.764e-06 1.756e-07
25- 50 2.923e-06 1.110e-07
50-150 2.991e-07 4.313e-08
15-150 5.986e-06 2.154e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.6656 (-1.0591 1.15353)
Norm : 3.05429 (-0.30601 0.342938)
------------------------------------------------------------
# Chi-Squared = 79.93 using 59 PHA bins.
# Reduced chi-squared = 1.402 for 57 degrees of freedom
# Null hypothesis probability = 2.423133e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.439e-06 1.858e-07
25- 50 2.723e-06 1.110e-07
50-150 6.565e-07 8.959e-08
15-150 6.819e-06 2.435e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.34964 (-2.32192 6.74426)
R1^2/D10^2 : 16.1199 (-20.6641 -21.0017)
kT2 [keV] : 6.37009 (-0.28463 2.55597)
R2^2/D10^2 : 0.533945 (-0.52219 0.154889)
------------------------------------------------------------
# Chi-Squared = 53.31 using 59 PHA bins.
# Reduced chi-squared = 0.9693 for 55 degrees of freedom
# Null hypothesis probability = 5.394468e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.991e-06 5.898e-07
25- 50 2.901e-06 3.020e-07
50-150 3.345e-07 6.874e-08
15-150 6.226e-06 8.443e-07
Peak spectrum fit
Power-law model
Time interval is from 376.072 sec. to 377.072 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.25668 ( -0.425827 0.504093 )
Norm@50keV : 3.25417E-03 ( -0.00113917 0.00110142 )
------------------------------------------------------------
# Chi-Squared = 44.36 using 59 PHA bins.
# Reduced chi-squared = 0.7782 for 57 degrees of freedom
# Null hypothesis probability = 8.890117e-01
Photon flux (15-150 keV) in 1 sec: 0.555310 ( -0.124845 0.124886 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08629e-08 ( -8.72656e-09 9.28448e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 376.072 sec. to 377.072 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69597 ( -2.46652 0.372167 )
Epeak [keV] : 19.8547 ( )
Norm@50keV : 7.36316E-03 ( )
------------------------------------------------------------
# Chi-Squared = 44.07 using 59 PHA bins.
# Reduced chi-squared = 0.7870 for 56 degrees of freedom
# Null hypothesis probability = 8.758126e-01
Photon flux (15-150 keV) in 1 sec: 0.548474 ( -0.12511 0.124349 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89971e-08 ( -8.8669e-09 1.0551e-08 ) ergs/cm2
Band function
Time interval is from 376.072 sec. to 377.072 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95588 ( -45.2785 -45.2785 )
beta : -2.39662 ( -0.712214 0.499211 )
Epeak [keV] : 19.5296 ( -19.4885 6.4851 )
Norm@50keV : 3311.30 ( -3376.67 2485.63 )
------------------------------------------------------------
# Chi-Squared = 43.75 using 59 PHA bins.
# Reduced chi-squared = 0.7955 for 55 degrees of freedom
# Null hypothesis probability = 8.624093e-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] : 7.86346 (-2.02926 2.64834)
R^2/D10^2 : 0.659631 (-0.450518 1.52948)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 48.28 using 59 PHA bins.
# Reduced chi-squared = 0.8471 for 57 degrees of freedom
# Null hypothesis probability = 7.877841e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.280e-09 3.316e-09
25- 50 1.236e-08 5.563e-09
50-150 3.067e-09 2.179e-09
15-150 2.271e-08 9.266e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 41.8111 (-18.5398 44.8725)
Norm : 3.52532 (-1.22588 2.14198)
------------------------------------------------------------
# Chi-Squared = 44.16 using 59 PHA bins.
# Reduced chi-squared = 0.7748 for 57 degrees of freedom
# Null hypothesis probability = 8.930205e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.213e-09 2.644e-09
25- 50 1.101e-08 4.280e-09
50-150 8.934e-09 5.808e-09
15-150 2.816e-08 1.042e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.22607 (-2.36414 3.3293)
R1^2/D10^2 : 5.62205 (-4.94258 416.475)
kT2 [keV] : 13.7984 (-10.882 54.9386)
R2^2/D10^2 : 4.99408E-02 (-0.0497416 0.46044)
------------------------------------------------------------
# Chi-Squared = 43.75 using 59 PHA bins.
# Reduced chi-squared = 0.7955 for 55 degrees of freedom
# Null hypothesis probability = 8.622981e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.643e-09 4.980e-09
25- 50 1.017e-08 5.255e-09
50-150 9.219e-09 6.120e-09
15-150 2.803e-08 1.444e-08
Plot creation:
Sat Sep 10 05:08:10 EDT 2011