batgrbproduct Analysis for Trigger=515277
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 Feb 18 16:21:29 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger515277/batgroup_hand_proc
======================================================================
Trigger: 00515277 Segment: 000
BAT Trigger Time: 351218970.048 [s; MET]
Trigger Stop: 351218978.24 [s; MET]
UTC: 2012-02-18T00:49:22.145800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 319.757959799859 Dec: -25.4504975119872 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.67
Image Trigger?: NO
Rate S/N Ratio: 27.0370116691915 [ if not an image trigger ]
Image S/N Ratio: 9.67
Flight Position: [ source = BAT ]
RA: 319.757959799859 Dec: -25.4504975119872 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: Dec: [deg; J2000]
{ 00h 00m 00.0s , +00d 00' 00.0" }
+/- inf [arcmin] (estimated 90% radius based on SNR)
+/- 0 [arcmin] (formal 1-sigma fit error)
SNR:
Angular difference between Flight and Ground position is 2785.767749 arcmin
Partial Coding Fraction: 0.04638672 [ including projection effects ]
Duration
T90: 27.607999920845 +/- 0.909927472709966
Measured from: -20.2519998550415
to: 7.35600006580353 [s; relative to TRIGTIME]
T50: 14.9639999866486 +/- 2.4543186317695
Measured from: -11.5919998884201
to: 3.37200009822845 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.32800000905991
to: 3.32800000905991 [s; relative to TRIGTIME]
Total Fluence
Measured from: -20.8560000061989
to: 9.29199999570847 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.203343 2.993718 2.245542 0.595375
0.167810 0.172343 0.149826 0.114503 [error]
Peak 0.237355 0.409923 0.327761 0.116099
0.038786 0.043004 0.041615 0.029551 [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 9.35e-07 1.47e-06 1.74e-06 4.02e-06 5.32e-06 8.17e-06 erg/cm2
Error 9.86e-08 9.66e-08 1.48e-07 7.11e-07 3.58e-07 8.33e-07 erg/cm2
Peak flux Power-law 3.36e+00 3.06e+00 1.93e+00 1.86e+00 9.13e+00 1.02e+01 ph/cm2/s
Error 6.57e-01 3.99e-01 2.83e-01 5.15e-01 1.17e+00 1.25e+00 ph/cm2/s
Fluence Cutoff-PL 8.58e-07 1.55e-06 1.81e-06 2.02e-06 6.23e-06 0.00e+00 erg/cm2
Error 1.19e-07 1.21e-07 1.64e-07 1.28e-06 1.31e-06 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.90e+00 3.31e+00 2.17e+00 9.03e+00 9.42e+00 0.00e+00 ph/cm2/s
Error 7.81e-01 4.89e-01 3.80e-01 1.17e+00 1.34e+00 0.00e+00 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 1.754 0.109 - - 1.91e-02 1.25e-03 42.270 57
CPL 1.240 0.485 73.7 85.6 3.49e-02 2.10e-02 38.560 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.667 0.184 - - 6.95e-02 8.64e-03 82.040 57
CPL 0.910 0.837 78.6 470.4 1.62e-01 1.87e-01 79.170 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: 33.920000 sec.
T50 in the 50-300 keV band: 21.824000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 30.148 -20.856 9.292
T90 27.608 -20.252 7.356
T50 14.964 -11.592 3.372
Peak 1.000 2.328 3.328
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
Foreground time interval of the image:
-20.856 9.292 (delta_t = 30.148 [sec])
Background time interval of the image:
-239.048 -197.738 (delta_t = 41.310 [sec])
-197.048 -20.856 (delta_t = 176.192 [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 -20.856 sec. to 9.292 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75419 ( -0.108364 0.109883 )
Norm@50keV : 1.91204E-02 ( -0.00125336 0.00124797 )
------------------------------------------------------------
# Chi-Squared = 42.27 using 59 PHA bins.
# Reduced chi-squared = 0.7417 for 57 degrees of freedom
# Null hypothesis probability = 9.272844e-01
Photon flux (15-150 keV) in 30.15 sec: 2.58940 ( -0.17265 0.173107 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.31813e-06 ( -3.57305e-07 3.58411e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.856 sec. to 9.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23968 ( -0.51292 0.45726 )
Epeak [keV] : 73.6695 ( -16.0738 155.107 )
Norm@50keV : 3.48722E-02 ( -0.0141771 0.027899 )
------------------------------------------------------------
# Chi-Squared = 38.56 using 59 PHA bins.
# Reduced chi-squared = 0.6886 for 56 degrees of freedom
# Null hypothesis probability = 9.635773e-01
Photon flux (15-150 keV) in 30.15 sec: 2.52739 ( -0.18087 0.18131 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.23409e-06 ( -9.45715e-07 1.6761e-06 ) ergs/cm2
Band function
Time interval is from -20.856 sec. to 9.292 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.984301 ( -0.607183 4.72972 )
beta : -2.09571 ( 2.09946 0.313092 )
Epeak [keV] : 59.8401 ( -32.3291 37.0229 )
Norm@50keV : 4.92737E-02 ( -0.0274227 243.154 )
------------------------------------------------------------
# Chi-Squared = 37.40 using 59 PHA bins.
# Reduced chi-squared = 0.6800 for 55 degrees of freedom
# Null hypothesis probability = 9.667367e-01
Photon flux (15-150 keV) in 30.15 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] : 13.4341 (-0.958423 1.03596)
R^2/D10^2 : 0.415188 (-0.100941 0.132087)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 85.92 using 59 PHA bins.
# Reduced chi-squared = 1.507 for 57 degrees of freedom
# Null hypothesis probability = 7.939239e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.787e-07 5.291e-08
25- 50 1.707e-06 1.358e-07
50-150 1.984e-06 2.649e-07
15-150 4.170e-06 3.090e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 119.697 (-5.81558 59.0102)
Norm : 10.9934 (-0.92651 1.03488)
------------------------------------------------------------
# Chi-Squared = 38.52 using 59 PHA bins.
# Reduced chi-squared = 0.6758 for 57 degrees of freedom
# Null hypothesis probability = 9.712298e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.634e-07 8.246e-08
25- 50 1.544e-06 1.048e-07
50-150 2.752e-06 3.669e-07
15-150 5.159e-06 4.161e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.10739 (-2.1655 2.73834)
R1^2/D10^2 : 2.69757 (-1.64172 6.75199)
kT2 [keV] : 22.8447 (-5.46674 19.7053)
R2^2/D10^2 : 4.18930E-02 (-0.0363998 0.08885)
------------------------------------------------------------
# Chi-Squared = 43.09 using 59 PHA bins.
# Reduced chi-squared = 0.7835 for 55 degrees of freedom
# Null hypothesis probability = 8.779270e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.902e-07 2.299e-07
25- 50 1.593e-06 3.891e-07
50-150 2.691e-06 9.312e-07
15-150 5.075e-06 1.403e-06
Peak spectrum fit
Power-law model
Time interval is from 2.328 sec. to 3.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66668 ( -0.180954 0.187614 )
Norm@50keV : 6.95149E-02 ( -0.00866132 0.00862806 )
------------------------------------------------------------
# Chi-Squared = 82.04 using 59 PHA bins.
# Reduced chi-squared = 1.439 for 57 degrees of freedom
# Null hypothesis probability = 1.659386e-02
Photon flux (15-150 keV) in 1 sec: 9.12750 ( -1.16782 1.17023 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.45473e-07 ( -8.29136e-08 8.30065e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.328 sec. to 3.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.909750 ( -0.913721 0.760707 )
Epeak [keV] : 78.6404 ( -20.1473 920.645 )
Norm@50keV : 0.162001 ( -0.0916047 0.28154 )
------------------------------------------------------------
# Chi-Squared = 79.17 using 59 PHA bins.
# Reduced chi-squared = 1.414 for 56 degrees of freedom
# Null hypothesis probability = 2.245610e-02
Photon flux (15-150 keV) in 1 sec: 9.02775 ( -1.16849 1.17385 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 2.328 sec. to 3.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.48788E-02 ( -1.39441 4.00036 )
beta : -2.08435 ( 2.10138 0.436833 )
Epeak [keV] : 53.5631 ( -18.9196 71.243 )
Norm@50keV : 0.512380 ( -0.509945 385.396 )
------------------------------------------------------------
# Chi-Squared = 78.48 using 59 PHA bins.
# Reduced chi-squared = 1.427 for 55 degrees of freedom
# Null hypothesis probability = 2.049473e-02
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] : 14.6448 (-1.93192 2.2263)
R^2/D10^2 : 1.18587 (-0.480356 0.781999)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 92.38 using 59 PHA bins.
# Reduced chi-squared = 1.621 for 57 degrees of freedom
# Null hypothesis probability = 2.098838e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.344e-08 1.099e-08
25- 50 2.077e-07 3.355e-08
50-150 2.998e-07 6.390e-08
15-150 5.609e-07 8.970e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 157.146 (-0.489745 -101.254)
Norm : 38.2435 (-5.21309 5.94982)
------------------------------------------------------------
# Chi-Squared = 79.74 using 59 PHA bins.
# Reduced chi-squared = 1.399 for 57 degrees of freedom
# Null hypothesis probability = 2.506192e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.782e-08 1.798e-08
25- 50 1.825e-07 2.595e-08
50-150 3.671e-07 6.055e-08
15-150 6.475e-07 8.615e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.53248 (-3.51849 3.48905)
R1^2/D10^2 : 3.86260 ( )
kT2 [keV] : 30.9645 (-10.5798 81.1101)
R2^2/D10^2 : 4.66586E-02 (-0.0454038 0.22206)
------------------------------------------------------------
# Chi-Squared = 79.55 using 59 PHA bins.
# Chi-Squared = 78.77 using 59 PHA bins.
# Reduced chi-squared = 1.446 for 55 degrees of freedom
# Reduced chi-squared = 1.432 for 55 degrees of freedom
# Null hypothesis probability = 1.685045e-02
# Null hypothesis probability = 1.944050e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.758e-08 4.681e-08
25- 50 1.940e-07 1.042e-07
50-150 3.369e-07 1.968e-07
15-150 6.085e-07 3.327e-07
Plot creation:
Sat Feb 18 16:51:25 EST 2012