batgrbproduct Analysis for Trigger=515015
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 Feb 15 10:30:04 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger515015/GCN5_download_cron
======================================================================
Trigger: 00515015 Segment: 000
BAT Trigger Time: 350959283.2 [s; MET]
Trigger Stop: 350959287.296 [s; MET]
UTC: 2012-02-15T00:41:15.308260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 30.0323071653144 Dec: 8.79177878164953 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.68
Image Trigger?: NO
Rate S/N Ratio: 12.8062484748657 [ if not an image trigger ]
Image S/N Ratio: 8.68
Flight Position: [ source = BAT ]
RA: 30.0323071653144 Dec: 8.79177878164953 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 30.0622069489911 Dec: 8.79583865359866 [deg; J2000]
{ 02h 00m 14.9s , +08d 47' 45.0" }
+/- 1.95390617745373 [arcmin] (estimated 90% radius based on SNR)
+/- 1.1301680289785 [arcmin] (formal 1-sigma fit error)
SNR: 11.6826578363493
Angular difference between Flight and Ground position is 1.789555 arcmin
Partial Coding Fraction: 0.8359375 [ including projection effects ]
Duration
T90: 26.5760000348091 +/- 8.50432734691697
Measured from: -0.351999878883362
to: 26.2240001559258 [s; relative to TRIGTIME]
T50: 10.4800000786781 +/- 4.38893155115813
Measured from: 2.32000011205673
to: 12.8000001907349 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.85199999809265
to: 5.85199999809265 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.50400000810623
to: 28.2879999876022 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.193404 0.281237 0.167711 0.027830
0.028962 0.029956 0.026500 0.022827 [error]
Peak 0.027641 0.015685 0.024989 0.001050
0.005380 0.005525 0.004948 0.004226 [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 6.41e-08 1.07e-07 1.35e-07 3.42e-07 4.01e-07 6.48e-07 erg/cm2
Error 1.24e-08 1.37e-08 2.50e-08 1.29e-07 5.98e-08 1.53e-07 erg/cm2
Peak flux Power-law 2.21e-01 1.95e-01 1.18e-01 1.07e-01 5.80e-01 6.42e-01 ph/cm2/s
Error 7.87e-02 4.49e-02 4.11e-02 7.50e-02 1.33e-01 1.51e-01 ph/cm2/s
Fluence Cutoff-PL 5.84e-08 1.19e-07 1.36e-07 9.38e-08 4.08e-07 0.00e+00 erg/cm2
Error 1.41e-08 1.89e-08 2.92e-08 1.75e-07 1.76e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.13e-01 2.00e-01 1.21e-01 8.20e-02 5.75e-01 6.15e-01 ph/cm2/s
Error 9.31e-02 5.20e-02 4.57e-02 1.37e-01 1.70e-01 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 6.12e-01 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 1.660 0.218 - - 1.45e-03 2.02e-04 47.350 57
CPL 0.767 1.037 62.0 476.8 4.49e-03 9.79e-03 44.570 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.727 0.436 - - 4.33e-03 1.15e-03 88.040 57
CPL 1.489 1.401 107.4 0.0 5.73e-03 2.22e-02 87.960 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: 9.408000 sec.
T50 in the 50-300 keV band: 4.992000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 29.792 -1.504 28.288
T90 26.576 -0.352 26.224
T50 10.480 2.320 12.800
Peak 1.000 4.852 5.852
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
30.0622 +8.7958 0.0164 29.7 -8.5 0.6847 11.7 TRIG_00515015
------------------------------------------
Foreground time interval of the image:
-1.504 28.288 (delta_t = 29.792 [sec])
Background time interval of the image:
-239.200 -1.504 (delta_t = 237.696 [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 -1.504 sec. to 28.288 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66031 ( -0.214124 0.221119 )
Norm@50keV : 1.44891E-03 ( -0.000203947 0.000200808 )
------------------------------------------------------------
# Chi-Squared = 47.35 using 59 PHA bins.
# Reduced chi-squared = 0.8308 for 57 degrees of freedom
# Null hypothesis probability = 8.150363e-01
Photon flux (15-150 keV) in 29.79 sec: 0.189840 ( -0.0242813 0.0242942 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.01033e-07 ( -5.92487e-08 6.03432e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.504 sec. to 28.288 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.767241 ( -1.16395 0.910491 )
Epeak [keV] : 61.9916 ( -16.0663 937.584 )
Norm@50keV : 4.48951E-03 ( -0.00448958 0.015094 )
------------------------------------------------------------
# Chi-Squared = 44.57 using 59 PHA bins.
# Reduced chi-squared = 0.7959 for 56 degrees of freedom
# Null hypothesis probability = 8.642843e-01
Photon flux (15-150 keV) in 29.79 sec: 0.183966 ( -0.025045 0.025039 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.07742e-07 ( -9.50778e-08 2.56668e-07 ) ergs/cm2
Band function
Time interval is from -1.504 sec. to 28.288 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.14681 ( -19.2062 -9.22338 )
beta : -1.90735 ( -0.393811 0.288853 )
Epeak [keV] : 28.3356 ( -8.47584 5.52168 )
Norm@50keV : 21.8615 ( -21.3482 16.9533 )
------------------------------------------------------------
# Chi-Squared = 44.03 using 59 PHA bins.
# Reduced chi-squared = 0.8005 for 55 degrees of freedom
# Null hypothesis probability = 8.555027e-01
Photon flux (15-150 keV) in 29.79 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] : 12.3765 (-1.74919 2.07265)
R^2/D10^2 : 4.25592E-02 (-0.0183902 0.0315681)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 52.91 using 59 PHA bins.
# Reduced chi-squared = 0.9283 for 57 degrees of freedom
# Null hypothesis probability = 6.291795e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.116e-08 9.658e-09
25- 50 1.342e-07 2.409e-08
50-150 1.262e-07 3.511e-08
15-150 3.015e-07 5.639e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 124.799 (-22.6107 -100.552)
Norm : 0.805837 (-0.117018 0.146015)
------------------------------------------------------------
# Chi-Squared = 45.34 using 59 PHA bins.
# Reduced chi-squared = 0.7954 for 57 degrees of freedom
# Null hypothesis probability = 8.672083e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.242e-08 1.135e-08
25- 50 1.124e-07 1.543e-08
50-150 2.045e-07 4.171e-08
15-150 3.793e-07 5.318e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.79124 (-2.8751 3.76955)
R1^2/D10^2 : 0.216596 (-0.151463 0.35839)
kT2 [keV] : 20.3594 (-6.59838 48.9066)
R2^2/D10^2 : 4.90234E-03 (-0.00403001 0.0186249)
------------------------------------------------------------
# Chi-Squared = 44.19 using 59 PHA bins.
# Reduced chi-squared = 0.8035 for 55 degrees of freedom
# Null hypothesis probability = 8.513782e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.786e-08 3.199e-08
25- 50 1.181e-07 6.135e-08
50-150 1.887e-07 1.086e-07
15-150 3.647e-07 1.859e-07
Peak spectrum fit
Power-law model
Time interval is from 4.852 sec. to 5.852 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72684 ( -0.411517 0.460336 )
Norm@50keV : 4.32630E-03 ( -0.00118592 0.00111913 )
------------------------------------------------------------
# Chi-Squared = 88.04 using 59 PHA bins.
# Reduced chi-squared = 1.545 for 57 degrees of freedom
# Null hypothesis probability = 5.206626e-03
Photon flux (15-150 keV) in 1 sec: 0.580073 ( -0.133076 0.13314 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.99778e-08 ( -1.09601e-08 1.1305e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.852 sec. to 5.852 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48910 ( -1.89236 0.909954 )
Epeak [keV] : 107.425 ( -106.559 -106.559 )
Norm@50keV : 5.72787E-03 ( -0.00575744 0.0387169 )
------------------------------------------------------------
# Chi-Squared = 87.96 using 59 PHA bins.
# Reduced chi-squared = 1.571 for 56 degrees of freedom
# Null hypothesis probability = 4.096649e-03
Photon flux (15-150 keV) in 1 sec: 0.574976 ( -0.137216 0.136138 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.42837e-08 ( -2.39771e-08 3.96193e-08 ) ergs/cm2
Band function
Time interval is from 4.852 sec. to 5.852 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.93533 ( 1.30221 1.68868 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 4.37883 ( -4.37883 -4.37883 )
Norm@50keV : 1.90982E-19 ( -1.90982e-19 -1.90982e-19 )
------------------------------------------------------------
# Chi-Squared = 103.33 using 59 PHA bins.
# Reduced chi-squared = 1.8787 for 55 degrees of freedom
# Null hypothesis probability = 8.705489e-05
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] : 15.7039 (-3.68655 4.61758)
R^2/D10^2 : 5.51451E-02 (-0.0330888 0.0844574)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 92.71 using 59 PHA bins.
# Reduced chi-squared = 1.626 for 57 degrees of freedom
# Null hypothesis probability = 1.957009e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.823e-09 1.368e-09
25- 50 1.169e-08 5.694e-09
50-150 2.000e-08 9.856e-09
15-150 3.452e-08 1.442e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 132.449 (-44.1716 -100.559)
Norm : 2.43445 (-0.608012 0.870772)
------------------------------------------------------------
# Chi-Squared = 88.06 using 59 PHA bins.
# Reduced chi-squared = 1.545 for 57 degrees of freedom
# Null hypothesis probability = 5.186512e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.309e-09 1.866e-09
25- 50 1.148e-08 2.893e-09
50-150 2.146e-08 5.430e-09
15-150 3.924e-08 9.325e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.54099 (-1.34141 1.7328)
R1^2/D10^2 : 11.9392 (-10.1041 69.0479)
kT2 [keV] : 19.4118 (-4.71757 7.63624)
R2^2/D10^2 : 2.28973E-02 (-0.0156997 0.041866)
------------------------------------------------------------
# Chi-Squared = 82.97 using 59 PHA bins.
# Reduced chi-squared = 1.509 for 55 degrees of freedom
# Null hypothesis probability = 8.749188e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.509e-09 4.644e-09
25- 50 9.678e-09 5.425e-09
50-150 2.285e-08 1.464e-08
15-150 4.003e-08 2.178e-08
Plot creation:
Wed Feb 15 10:55:48 EST 2012