batgrbproduct Analysis for Trigger=515976
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): Fri Feb 24 18:23:10 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger515976/GCN5_download_cron
======================================================================
Trigger: 00515976 Segment: 000
BAT Trigger Time: 351751204.416 [s; MET]
Trigger Stop: 351751208.512 [s; MET]
UTC: 2012-02-24T04:39:56.492380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 40.9754640993993 Dec: -17.7926294691115 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.8
Image Trigger?: NO
Rate S/N Ratio: 9.8488578017961 [ if not an image trigger ]
Image S/N Ratio: 7.8
Flight Position: [ source = BAT ]
RA: 40.9754640993993 Dec: -17.7926294691115 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 40.9380572321283 Dec: -17.7787550117379 [deg; J2000]
{ 02h 43m 45.1s , -17d 46' 43.5" }
+/- 2.3689325477731 [arcmin] (estimated 90% radius based on SNR)
+/- 1.21345333661909 [arcmin] (formal 1-sigma fit error)
SNR: 8.87244062102768
Angular difference between Flight and Ground position is 2.293551 arcmin
Partial Coding Fraction: 0.296875 [ including projection effects ]
Duration
T90: 8.12800002098083 +/- 2.10520116432153
Measured from: -0.631999909877777
to: 7.49600011110306 [s; relative to TRIGTIME]
T50: 3.58400005102158 +/- 1.8822964763074
Measured from: 0.456000089645386
to: 4.04000014066696 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.244000017642975
to: 1.24400001764297 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.0799999833107
to: 8.26399999856949 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.172574 0.214521 0.049482 0.033634
0.028082 0.029066 0.025846 0.024049 [error]
Peak 0.035665 0.050076 0.010385 0.016834
0.009608 0.010297 0.008411 0.007872 [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 6.54e-08 7.64e-08 6.42e-08 9.13e-08 2.39e-07 2.97e-07 erg/cm2
Error 1.45e-08 1.45e-08 2.32e-08 6.31e-08 5.37e-08 9.38e-08 erg/cm2
Peak flux Power-law 4.00e-01 2.95e-01 1.45e-01 1.01e-01 8.87e-01 9.40e-01 ph/cm2/s
Error 1.47e-01 8.34e-02 6.54e-02 8.55e-02 2.49e-01 2.67e-01 ph/cm2/s
Fluence Cutoff-PL 6.18e-08 8.64e-08 5.71e-08 1.67e-08 2.22e-07 0.00e+00 erg/cm2
Error 1.64e-08 2.12e-08 2.79e-08 7.15e-08 9.88e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.70e-01 3.90e-01 8.83e-02 2.19e-03 8.50e-01 8.50e-01 ph/cm2/s
Error 1.63e-01 1.36e-01 9.72e-02 3.99e-02 2.44e-01 2.44e-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 2.250 0.360 - - 2.70e-03 7.15e-04 48.110 57
CPL 1.187 1.709 29.2 0.0 1.20e-02 0.00e+00 46.830 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.029 0.493 - - 5.83e-03 2.07e-03 59.320 57
CPL -0.414 4.899 34.2 0.0 2.23e-01 1.49e+04 57.200 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 9.344 -1.080 8.264
T90 8.128 -0.632 7.496
T50 3.584 0.456 4.040
Peak 1.000 0.244 1.244
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
40.9381 -17.7788 0.0216 35.6 -113.5 0.5200 8.9 TRIG_00515976
------------------------------------------
Foreground time interval of the image:
-1.080 8.264 (delta_t = 9.344 [sec])
Background time interval of the image:
-239.416 -1.080 (delta_t = 238.336 [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 -1.080 sec. to 8.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.24996 ( -0.335215 0.385102 )
Norm@50keV : 2.69756E-03 ( -0.000726362 0.000704396 )
------------------------------------------------------------
# Chi-Squared = 48.11 using 59 PHA bins.
# Reduced chi-squared = 0.8439 for 57 degrees of freedom
# Null hypothesis probability = 7.931822e-01
Photon flux (15-150 keV) in 9.344 sec: 0.458652 ( -0.0800691 0.0800833 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38791e-07 ( -5.23284e-08 5.50681e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.080 sec. to 8.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18722 ( -2.20574 1.21306 )
Epeak [keV] : 29.2194 ( )
Norm@50keV : 1.20275E-02 ( )
------------------------------------------------------------
# Chi-Squared = 46.83 using 59 PHA bins.
# Reduced chi-squared = 0.8363 for 56 degrees of freedom
# Null hypothesis probability = 8.036785e-01
Photon flux (15-150 keV) in 9.344 sec: 0.446411 ( -0.040611 0.081699 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22043e-07 ( -5.08678e-08 1.46747e-07 ) ergs/cm2
Band function
Time interval is from -1.080 sec. to 8.264 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.23268 ( 1.23271 1.57062 )
beta : -9.37163 ( 9.99997 20 )
Epeak [keV] : 29.0266 ( -9.98605 20.3213 )
Norm@50keV : 1.12279E-02 ( -0.0112318 1.99753e+06 )
------------------------------------------------------------
# Chi-Squared = 46.83 using 59 PHA bins.
# Reduced chi-squared = 0.8515 for 55 degrees of freedom
# Null hypothesis probability = 7.753052e-01
Photon flux (15-150 keV) in 9.344 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] : 9.01701 (-1.55811 1.78138)
R^2/D10^2 : 0.322573 (-0.164542 0.352959)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 50.58 using 59 PHA bins.
# Reduced chi-squared = 0.8874 for 57 degrees of freedom
# Null hypothesis probability = 7.130874e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.776e-08 1.443e-08
25- 50 1.018e-07 2.987e-08
50-150 3.906e-08 1.883e-08
15-150 1.886e-07 5.387e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 43.8301 (-15.767 30.4642)
Norm : 2.82524 (-0.764974 1.15467)
------------------------------------------------------------
# Chi-Squared = 46.87 using 59 PHA bins.
# Reduced chi-squared = 0.8223 for 57 degrees of freedom
# Null hypothesis probability = 8.284520e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.238e-08 1.456e-08
25- 50 8.525e-08 2.252e-08
50-150 7.268e-08 3.952e-08
15-150 2.203e-07 6.190e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.65365 (-1.1985 1.87462)
R1^2/D10^2 : 38.3293 (-36.0498 3571.79)
kT2 [keV] : 10.8275 (-2.15897 3.26202)
R2^2/D10^2 : 0.136445 (-0.0931016 0.208007)
------------------------------------------------------------
# Chi-Squared = 44.11 using 59 PHA bins.
# Reduced chi-squared = 0.8020 for 55 degrees of freedom
# Null hypothesis probability = 8.534951e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.110e-08 3.150e-08
25- 50 8.902e-08 5.195e-08
50-150 5.641e-08 3.719e-08
15-150 2.065e-07 1.083e-07
Peak spectrum fit
Power-law model
Time interval is from 0.244 sec. to 1.244 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02873 ( -0.461919 0.523218 )
Norm@50keV : 5.83172E-03 ( -0.00210736 0.00203566 )
------------------------------------------------------------
# Chi-Squared = 59.32 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 57 degrees of freedom
# Null hypothesis probability = 3.909617e-01
Photon flux (15-150 keV) in 1 sec: 0.886512 ( -0.248856 0.248863 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.38749e-08 ( -1.76226e-08 1.85569e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.244 sec. to 1.244 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.414265 ( -7.25692 2.54077 )
Epeak [keV] : 34.1767 ( -34.0987 -34.0987 )
Norm@50keV : 0.222928 ( -0.264754 29771.1 )
------------------------------------------------------------
# Chi-Squared = 57.20 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 56 degrees of freedom
# Null hypothesis probability = 4.302867e-01
Photon flux (15-150 keV) in 1 sec: 0.849749 ( -0.241751 0.245851 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.24199e-08 ( -1.42999e-08 4.68674e-08 ) ergs/cm2
Band function
Time interval is from 0.244 sec. to 1.244 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99685 ( -617.429 -607.429 )
beta : -2.74011 ( -1.96606 0.810272 )
Epeak [keV] : 26.9111 ( -8.07637 7.70646 )
Norm@50keV : 718.366 ( -718.358 6715.27 )
------------------------------------------------------------
# Chi-Squared = 55.57 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 55 degrees of freedom
# Null hypothesis probability = 4.529744e-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] : 8.52162 (-2.03869 2.74761)
R^2/D10^2 : 0.829637 (-0.559369 1.58956)
(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 = 4.624692e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.137e-08 6.732e-09
25- 50 2.215e-08 1.331e-08
50-150 7.128e-09 5.380e-09
15-150 4.065e-08 2.493e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 52.3534 (-25.8786 92.9659)
Norm : 5.03902 (-1.9243 3.18597)
------------------------------------------------------------
# Chi-Squared = 58.21 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 57 degrees of freedom
# Null hypothesis probability = 4.306510e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.245e-08 6.014e-09
25- 50 1.817e-08 8.319e-09
50-150 1.841e-08 1.294e-08
15-150 4.902e-08 2.609e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.91753 (-8.28157 2.23191)
R1^2/D10^2 : 1.05615 (-0.497567 2.29412)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 5.93069E-05 (-5.93069e-05 7.11553e-05)
------------------------------------------------------------
# Chi-Squared = 55.61 using 59 PHA bins.
# Chi-Squared = 55.52 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 55 degrees of freedom
# Reduced chi-squared = 1.009 for 55 degrees of freedom
# Null hypothesis probability = 4.517795e-01
# Null hypothesis probability = 4.551667e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.127e-08 6.665e-09
25- 50 2.146e-08 1.325e-08
50-150 2.015e-08 5.735e-09
15-150 5.288e-08 2.444e-08
Plot creation:
Fri Feb 24 18:45:37 EST 2012