batgrbproduct Analysis for Trigger=552369
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 3 16:57:52 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger552369/batgroup_hand_proc
======================================================================
Trigger: 00552369 Segment: 000
BAT Trigger Time: 386349048 [s; MET]
Trigger Stop: 386349112 [s; MET]
UTC: 2013-03-30T15:10:37.617100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 276.148848940488 Dec: -24.8769090861674 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.1
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.1
Flight Position: [ source = BAT ]
RA: 276.148848940488 Dec: -24.8769090861674 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 276.222216917219 Dec: -24.8743310638093 [deg; J2000]
{ 18h 24m 53.3s , -24d 52' 27.6" }
+/- 2.7623909452974 [arcmin] (estimated 90% radius based on SNR)
+/- 1.4344237395751 [arcmin] (formal 1-sigma fit error)
SNR: 7.12378878654049
Angular difference between Flight and Ground position is 3.996662 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 55.2359999418259 +/- 11.9343510750244
Measured from: -7.89999997615814
to: 47.3359999656677 [s; relative to TRIGTIME]
T50: 29.0479999184608 +/- 11.4056963245776
Measured from: 4.47200000286102
to: 33.5199999213219 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 36.944000005722
to: 37.944000005722 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.8960000276566
to: 53.744000017643 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.434809 0.334253 0.196948 0.068900
0.056082 0.049010 0.042293 0.038731 [error]
Peak 0.014937 0.013597 0.006047 0.008156
0.006541 0.006089 0.005050 0.004539 [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 1.06e-07 1.45e-07 1.46e-07 2.65e-07 4.83e-07 6.63e-07 erg/cm2
Error 2.39e-08 2.22e-08 4.08e-08 1.52e-07 9.12e-08 1.94e-07 erg/cm2
Peak flux Power-law 9.41e-02 9.42e-02 6.62e-02 7.38e-02 2.84e-01 3.28e-01 ph/cm2/s
Error 7.37e-02 7.06e-02 3.93e-02 1.09e-01 1.37e-01 1.58e-01 ph/cm2/s
Fluence Cutoff-PL 1.07e-07 1.45e-07 1.45e-07 2.59e-07 4.80e-07 6.55e-07 erg/cm2
Error 2.39e-08 2.37e-08 3.42e-08 2.17e-07 9.09e-08 2.20e-07 erg/cm2
Peak flux Cutoff-PL 7.36e-02 1.20e-01 5.83e-02 5.17e-03 2.57e-01 2.57e-01 ph/cm2/s
Error 8.25e-02 9.41e-02 4.89e-02 4.74e-02 1.46e-01 1.74e-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 1.993 0.316 - - 7.52e-04 1.50e-04 0.000 57
CPL 2.422 0.000 153.8 0.0 4.60e-04 0.00e+00 0.000 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.508 0.902 - - 2.27e-03 1.11e-03 0.000 57
CPL -0.605 1.007 50.3 0.0 3.80e-02 2.42e+03 0.000 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 69.640 -15.896 53.744
T90 55.236 -7.900 47.336
T50 29.048 4.472 33.520
Peak 1.000 36.944 37.944
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
276.2222 -24.8743 0.0268 0.0959 -98.2308 0.7643428 7.124 TRIG_00552369
Foreground time interval of the image:
-15.896 53.744 (delta_t = 69.640 [sec])
Background time interval of the image:
-239.000 -15.896 (delta_t = 223.104 [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 -15.896 sec. to 53.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99259 ( -0.304993 0.327885 )
Norm@50keV : 7.52038E-04 ( -0.000153162 0.000146534 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.41 using 59 PHA bins.
# Reduced chi-squared = 0.6212 for 57 degrees of freedom
# Null hypothesis probability = 9.890023e-01
Photon flux (15-150 keV) in 69.64 sec: 0.112423 ( -0.0170652 0.017077 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.82778e-07 ( -8.95591e-08 9.28984e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.896 sec. to 53.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.42158 ( )
Epeak [keV] : 153.791 ( )
Norm@50keV : 4.60468E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.01 using 59 PHA bins.
# Reduced chi-squared = 0.6251 for 56 degrees of freedom
# Null hypothesis probability = 9.874663e-01
Photon flux (15-150 keV) in 69.64 sec: 0.112486 ( -0.0171516 0.017005 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.79689e-07 ( -8.88001e-08 9.29478e-08 ) ergs/cm2
Band function
Time interval is from -15.896 sec. to 53.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.665124 ( 1.41962 1.41962 )
beta : -2.03457 ( 2.01178 0.321372 )
Epeak [keV] : 20.8670 ( -22.8606 -22.8606 )
Norm@50keV : 0.113929 ( -0.11374 259.604 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.30 using 59 PHA bins.
# Reduced chi-squared = 0.6419 for 55 degrees of freedom
# Null hypothesis probability = 9.821003e-01
Photon flux (15-150 keV) in 69.64 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] : 9.00513 (-1.91102 2.56883)
R^2/D10^2 : 7.30258E-02 (-0.0724082 0.114105)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.66 using 59 PHA bins.
# Reduced chi-squared = 0.9238 for 57 degrees of freedom
# Null hypothesis probability = 6.385356e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.032e-08 2.281e-08
25- 50 1.709e-07 4.151e-08
50-150 6.529e-08 3.106e-08
15-150 3.165e-07 8.071e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 70.8582 (-29.816 77.1028)
Norm : 0.540489 (-0.124971 0.184552)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.79 using 59 PHA bins.
# Reduced chi-squared = 0.6629 for 57 degrees of freedom
# Null hypothesis probability = 9.766776e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.669e-08 2.297e-08
25- 50 1.543e-07 3.381e-08
50-150 2.000e-07 1.089e-07
15-150 4.511e-07 1.312e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.14409 (-1.48293 1.95796)
R1^2/D10^2 : 0.549437 (-0.391287 1.83525)
kT2 [keV] : 24.4231 (-9.31253 35.3841)
R2^2/D10^2 : 1.39821E-03 (-0.00128421 0.00409991)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.73 using 59 PHA bins.
# Reduced chi-squared = 0.6314 for 55 degrees of freedom
# Null hypothesis probability = 9.851360e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.143e-07 6.057e-08
25- 50 1.301e-07 6.853e-08
50-150 2.574e-07 1.567e-07
15-150 5.018e-07 2.432e-07
Peak spectrum fit
Power-law model
Time interval is from 36.944 sec. to 37.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50848 ( -0.935765 0.867965 )
Norm@50keV : 2.26709E-03 ( -0.00112803 0.00109656 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.69 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 57 degrees of freedom
# Null hypothesis probability = 4.494364e-01
Photon flux (15-150 keV) in 1 sec: 0.283672 ( -0.136539 0.137669 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14772e-08 ( -1.09797e-08 1.16465e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 36.944 sec. to 37.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.605233 ( 0.674318 2.68803 )
Epeak [keV] : 50.2516 ( -49.7266 -49.7266 )
Norm@50keV : 3.80478E-02 ( -0.0477786 4831.14 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.31 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 56 degrees of freedom
# Null hypothesis probability = 4.264781e-01
Photon flux (15-150 keV) in 1 sec: 0.256752 ( -0.13813 0.153585 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62874e-08 ( -8.46259e-09 1.58487e-08 ) ergs/cm2
Band function
Time interval is from 36.944 sec. to 37.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -1.80197 ( 1.80396 1.04699 )
Epeak [keV] : 26.8856 ( -26.915 58.2112 )
Norm@50keV : 177.104 ( -79.6176 2.72831e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.85 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 55 degrees of freedom
# Null hypothesis probability = 4.058566e-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] : 12.3299 (-4.64534 8.65114)
R^2/D10^2 : 6.71263E-02 (-0.0671263 0.304198)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.31 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 57 degrees of freedom
# Null hypothesis probability = 4.637519e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.162e-09 1.442e-09
25- 50 7.022e-09 4.568e-09
50-150 6.534e-09 5.435e-09
15-150 1.572e-08 1.118e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 187.378 (-188.336 -188.336)
Norm : 1.16738 (-0.552388 1.06743)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.62 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 57 degrees of freedom
# Null hypothesis probability = 4.520078e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.930e-09 1.979e-09
25- 50 5.594e-09 3.710e-09
50-150 1.201e-08 8.315e-09
15-150 2.054e-08 1.288e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.26 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.07 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.02 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.00 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Reduced chi-squared = 1.019 for 55 degrees of freedom
# Reduced chi-squared = 1.018 for 55 degrees of freedom
# Reduced chi-squared = 1.018 for 55 degrees of freedom
# Null hypothesis probability = 3.912199e-01
# Null hypothesis probability = 4.346818e-01
# Null hypothesis probability = 4.364632e-01
# Null hypothesis probability = 4.370622e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.457e-09 2.285e-09
25- 50 6.756e-09 6.095e-09
50-150 7.081e-09 1.005e-08
15-150 1.629e-08 1.392e-08
Plot creation:
Wed Apr 3 17:17:27 EDT 2013