batgrbproduct Analysis for Trigger=519380
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 4 21:57:59 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger519380/GCN5_download_cron
======================================================================
Trigger: 00519380 Segment: 000
BAT Trigger Time: 355236670.464 [s; MET]
Trigger Stop: 355236674.56 [s; MET]
UTC: 2012-04-04T12:51:02.398680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 235.011568820105 Dec: 12.8818416005109 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.42
Image Trigger?: NO
Rate S/N Ratio: 9.1104335791443 [ if not an image trigger ]
Image S/N Ratio: 11.42
Flight Position: [ source = BAT ]
RA: 235.011568820105 Dec: 12.8818416005109 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 235.003482450432 Dec: 12.8825605058718 [deg; J2000]
{ 15h 40m 00.8s , +12d 52' 57.2" }
+/- 1.28708284317529 [arcmin] (estimated 90% radius based on SNR)
+/- 0.521435078361451 [arcmin] (formal 1-sigma fit error)
SNR: 21.2098532659209
Angular difference between Flight and Ground position is 0.474933 arcmin
Partial Coding Fraction: 0.4921875 [ including projection effects ]
Duration
T90: 48 +/- 16
Measured from: -15.4639998674393
to: 32.5360001325607 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 0.53600013256073
to: 16.5360001325607 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.03600001335144
to: 9.03600001335144 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.4639999866486
to: 32.5360000133514 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.813393 0.988435 0.617231 0.117125
0.060990 0.060707 0.054087 0.049782 [error]
Peak 0.032210 0.031360 0.024359 0.019446
0.009056 0.008881 0.008075 0.007147 [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 2.93e-07 4.35e-07 4.83e-07 1.01e-06 1.52e-06 2.22e-06 erg/cm2
Error 3.43e-08 3.15e-08 5.36e-08 2.34e-07 1.23e-07 2.81e-07 erg/cm2
Peak flux Power-law 2.90e-01 2.64e-01 1.66e-01 1.59e-01 7.87e-01 8.80e-01 ph/cm2/s
Error 1.46e-01 8.02e-02 6.83e-02 1.40e-01 2.33e-01 2.55e-01 ph/cm2/s
Fluence Cutoff-PL 2.92e-07 4.37e-07 4.83e-07 9.48e-07 2.16e-06 0.00e+00 erg/cm2
Error 3.74e-08 3.58e-08 5.43e-08 4.43e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.92e-01 2.65e-01 1.65e-01 1.57e-01 7.88e-01 8.78e-01 ph/cm2/s
Error 1.45e-01 8.01e-02 6.83e-02 1.43e-01 2.33e-01 2.53e-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 1.852 0.137 - - 3.44e-03 2.77e-04 79.050 57
CPL 1.821 0.000 269.3 0.0 3.57e-03 0.00e+00 79.030 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.671 0.587 - - 5.99e-03 1.89e-03 56.400 57
CPL 2.052 0.000 21.5 0.0 3.54e-03 0.00e+00 55.990 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: 32.576000 sec.
T50 in the 50-300 keV band: 15.424000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 48.000 -15.464 32.536
T90 48.000 -15.464 32.536
T50 16.000 0.536 16.536
Peak 1.000 8.036 9.036
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
235.0035 +12.8826 0.0091 41.7 -175.8 2.7596 21.2 TRIG_00519380
------------------------------------------
Foreground time interval of the image:
-15.464 32.536 (delta_t = 48.000 [sec])
Background time interval of the image:
-239.464 -177.424 (delta_t = 62.040 [sec])
-119.464 -15.464 (delta_t = 104.000 [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 -15.464 sec. to 32.536 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85156 ( -0.135497 0.138917 )
Norm@50keV : 3.43805E-03 ( -0.000278535 0.000274792 )
------------------------------------------------------------
# Chi-Squared = 79.05 using 59 PHA bins.
# Reduced chi-squared = 1.387 for 57 degrees of freedom
# Null hypothesis probability = 2.827121e-02
Photon flux (15-150 keV) in 48 sec: 0.483560 ( -0.0357616 0.0358579 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51735e-06 ( -1.227e-07 1.2376e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.464 sec. to 32.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82057 ( )
Epeak [keV] : 269.337 ( )
Norm@50keV : 3.57107E-03 ( )
------------------------------------------------------------
# Chi-Squared = 79.03 using 59 PHA bins.
# Reduced chi-squared = 1.411 for 56 degrees of freedom
# Null hypothesis probability = 2.301168e-02
Photon flux (15-150 keV) in 48 sec: 0.482785 ( -0.037729 0.036316 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16053e-06 ( -5.42654e-07 3.4297e-07 ) ergs/cm2
Band function
Time interval is from -15.464 sec. to 32.536 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.932560 ( 1.32882 5.7181 )
beta : -1.88675 ( 1.87673 0.152853 )
Epeak [keV] : 30.6190 ( -29.9258 -29.9258 )
Norm@50keV : 1.59223E-02 ( -0.0170703 1052.56 )
------------------------------------------------------------
# Chi-Squared = 78.68 using 59 PHA bins.
# Reduced chi-squared = 1.431 for 55 degrees of freedom
# Null hypothesis probability = 1.976180e-02
Photon flux (15-150 keV) in 48 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] : 11.6306 ( )
R^2/D10^2 : 0.123633 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 136.91 using 59 PHA bins.
# Reduced chi-squared = 2.4020 for 57 degrees of freedom
# Null hypothesis probability = 1.590872e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.692e-07 2.467e-08
25- 50 5.131e-07 4.918e-08
50-150 4.085e-07 7.387e-08
15-150 1.091e-06 1.054e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 97.9206 (-23.5751 37.6452)
Norm : 2.11513 (-0.221663 0.260566)
------------------------------------------------------------
# Chi-Squared = 81.81 using 59 PHA bins.
# Reduced chi-squared = 1.435 for 57 degrees of freedom
# Null hypothesis probability = 1.728764e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.653e-07 3.182e-08
25- 50 4.568e-07 3.739e-08
50-150 7.315e-07 2.527e-07
15-150 1.454e-06 2.606e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.17416 (-1.18159 1.31573)
R1^2/D10^2 : 0.994960 (-0.499238 1.26145)
kT2 [keV] : 24.4281 (-5.20351 9.17125)
R2^2/D10^2 : 6.03916E-03 (-0.00404804 0.00897622)
------------------------------------------------------------
# Chi-Squared = 79.79 using 59 PHA bins.
# Reduced chi-squared = 1.451 for 55 degrees of freedom
# Null hypothesis probability = 1.611574e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.822e-07 6.934e-08
25- 50 4.375e-07 9.816e-08
50-150 7.842e-07 3.061e-07
15-150 1.504e-06 3.974e-07
Peak spectrum fit
Power-law model
Time interval is from 8.036 sec. to 9.036 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67125 ( -0.562426 0.611105 )
Norm@50keV : 5.98756E-03 ( -0.00195614 0.00183295 )
------------------------------------------------------------
# Chi-Squared = 56.40 using 59 PHA bins.
# Reduced chi-squared = 0.9895 for 57 degrees of freedom
# Null hypothesis probability = 4.975134e-01
Photon flux (15-150 keV) in 1 sec: 0.787396 ( -0.232573 0.23327 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.55718e-08 ( -1.82658e-08 1.8738e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.036 sec. to 9.036 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05238 ( )
Epeak [keV] : 21.4868 ( )
Norm@50keV : 3.53725E-03 ( )
------------------------------------------------------------
# Chi-Squared = 55.99 using 59 PHA bins.
# Reduced chi-squared = 0.9998 for 56 degrees of freedom
# Null hypothesis probability = 4.753363e-01
Photon flux (15-150 keV) in 1 sec: 0.787960 ( -0.233395 0.23178 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.85637e-08 ( -4.00273e-08 6.05973e-08 ) ergs/cm2
Band function
Time interval is from 8.036 sec. to 9.036 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36073 ( 1.36099 1.36099 )
beta : -1.66957 ( 1.67123 0.562282 )
Epeak [keV] : 18.6052 ( -18.6696 -18.6696 )
Norm@50keV : 1.38621E-02 ( -0.0138682 0.317342 )
------------------------------------------------------------
# Chi-Squared = 56.40 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 55 degrees of freedom
# Null hypothesis probability = 4.223296e-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] : 12.5675 (-4.66087 8.77099)
R^2/D10^2 : 0.153798 (-0.151722 0.687747)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 61.82 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 57 degrees of freedom
# Null hypothesis probability = 3.080833e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.151e-09 3.243e-09
25- 50 1.709e-08 1.061e-08
50-150 1.672e-08 1.190e-08
15-150 3.896e-08 2.454e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 163.900 (-53.0416 -101.571)
Norm : 3.18410 (-0.962153 1.65641)
------------------------------------------------------------
# Chi-Squared = 56.94 using 59 PHA bins.
# Reduced chi-squared = 0.9989 for 57 degrees of freedom
# Null hypothesis probability = 4.773846e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.111e-09 3.045e-09
25- 50 1.522e-08 5.171e-09
50-150 3.113e-08 9.250e-09
15-150 5.446e-08 1.568e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.95721 (-7.57356 5.62466)
R1^2/D10^2 : 0.689801 ( )
kT2 [keV] : 63.7710 (-64.363 -64.3631)
R2^2/D10^2 : 7.51933E-04 (-0.000687344 0.116628)
------------------------------------------------------------
# Chi-Squared = 56.58 using 59 PHA bins.
# Chi-Squared = 56.57 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 4.156222e-01
# Null hypothesis probability = 4.160284e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.305e-09 5.125e-09
25- 50 1.548e-08 9.350e-09
50-150 3.483e-08 1.915e-08
15-150 5.862e-08 2.921e-08
Plot creation:
Wed Apr 4 22:13:48 EDT 2012