batgrbproduct Analysis for Trigger=513505
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): Mon Feb 6 01:38:43 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger513505/GCN5_download_cron
======================================================================
Trigger: 00513505 Segment: 000
BAT Trigger Time: 350135252.476 [s; MET]
Trigger Stop: 350135252.54 [s; MET]
UTC: 2012-02-05T11:47:24.617420 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 40.1003583767653 Dec: 61.220476106393 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.53
Image Trigger?: NO
Rate S/N Ratio: 15.0332963783729 [ if not an image trigger ]
Image S/N Ratio: 7.53
Flight Position: [ source = BAT ]
RA: 40.1003583767653 Dec: 61.220476106393 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 40.0594015847184 Dec: 61.2349598468358 [deg; J2000]
{ 02h 40m 14.3s , +61d 14' 05.9" }
+/- 2.7879991206673 [arcmin] (estimated 90% radius based on SNR)
+/- 1.52913956983674 [arcmin] (formal 1-sigma fit error)
SNR: 7.03049733442349
Angular difference between Flight and Ground position is 1.467745 arcmin
Partial Coding Fraction: 0.765625 [ including projection effects ]
Duration
T90: 0.0399999618530273 +/- 0.0113137314268704
Measured from: 0.0200001001358032
to: 0.0600000619888306 [s; relative to TRIGTIME]
T50: 0.0199999213218689 +/- 0.00894429003608426
Measured from: 0.0280001163482666
to: 0.0480000376701355 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.456000030040741
to: 0.543999969959259 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0199999809265137
to: 0.0640000104904175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.013271 0.008279 0.000983 0.000684
0.002055 0.001830 0.000857 0.000955 [error]
Peak 0.023772 0.008933 0.000962 -0.004435
0.006183 0.005892 0.005040 0.004517 [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 4.04e-09 1.78e-09 4.69e-10 1.53e-10 6.38e-09 6.44e-09 erg/cm2
Error 9.49e-10 4.69e-10 2.01e-10 1.04e-10 1.46e-09 1.48e-09 erg/cm2
Peak flux Power-law 2.22e-01 7.69e-02 1.50e-02 3.46e-03 3.17e-01 3.18e-01 ph/cm2/s
Error 9.71e-02 5.67e-02 2.50e-02 1.41e-02 1.44e-01 1.47e-01 ph/cm2/s
Fluence Cutoff-PL 4.19e-09 3.51e-09 6.84e-10 1.75e-11 8.40e-09 0.00e+00 erg/cm2
Error 1.04e-09 1.11e-09 5.50e-10 3.53e-11 1.82e-09 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.22e-01 7.67e-02 1.49e-02 3.41e-03 3.16e-01 3.14e-01 ph/cm2/s
Error 1.26e-01 6.99e-02 2.50e-02 1.39e-02 1.46e-01 1.51e-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 3.924 0.361 - - 6.95e-03 2.48e-03 49.440 57
CPL 1.000 0.000 50.0 0.0 7.26e-03 0.00e+00 96.040 56
The chi2 of BB fit is 41.76 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.354 1.547 - - 8.80e-04 1.11e-03 55.210 57
CPL 1.000 0.000 50.0 0.0 5.91e-03 0.00e+00 60.910 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 0.044 0.020 0.064
T90 0.040 0.020 0.060
T50 0.020 0.028 0.048
Peak 1.000 -0.456 0.544
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
40.0594 +61.2350 0.0274 28.1 -135.7 0.0221 7.0 TRIG_00513505
------------------------------------------
Foreground time interval of the image:
0.020 0.064 (delta_t = 0.044 [sec])
Background time interval of the image:
-239.476 0.020 (delta_t = 239.496 [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 0.020 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.92384 ( -0.305257 0.416848 )
Norm@50keV : 6.94963E-03 ( -0.00254454 0.00242303 )
------------------------------------------------------------
# Chi-Squared = 49.44 using 59 PHA bins.
# Reduced chi-squared = 0.8674 for 57 degrees of freedom
# Null hypothesis probability = 7.513139e-01
Photon flux (15-150 keV) in 0.044 sec: 4.01097 ( -0.911574 0.911334 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.37701e-09 ( -1.4572e-09 1.45595e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.020 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 7.25545E-03 ( )
------------------------------------------------------------
# Chi-Squared = 96.04 using 59 PHA bins.
# Reduced chi-squared = 1.715 for 56 degrees of freedom
# Null hypothesis probability = 6.973182e-04
Photon flux (15-150 keV) in 0.044 sec: 4.79790 ( -1.00418 1.00418 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.40426e-09 ( -1.81504e-09 1.81786e-09 ) ergs/cm2
Band function
Time interval is from 0.020 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.775827 ( -1.06044 0.979235 )
beta : -9.99955 ( 7046.47 7056.46 )
Epeak [keV] : 16.0060 ( -14.6273 9.41142 )
Norm@50keV : 0.663137 ( -0.66332 162.843 )
------------------------------------------------------------
# Chi-Squared = 39.55 using 59 PHA bins.
# Reduced chi-squared = 0.7191 for 55 degrees of freedom
# Null hypothesis probability = 9.422338e-01
Photon flux (15-150 keV) in 0.044 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] : 5.68602 (-1.11605 1.32724)
R^2/D10^2 : 23.5604 (-14.6074 40.7225)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 41.76 using 59 PHA bins.
# Reduced chi-squared = 0.7327 for 57 degrees of freedom
# Null hypothesis probability = 9.350967e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.105e-09 1.795e-09
25- 50 3.634e-09 1.511e-09
50-150 2.655e-10 1.858e-10
15-150 8.004e-09 3.435e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.7157 (-4.05948 3.47239)
Norm : 74.4093 (-23.544 38.2167)
------------------------------------------------------------
# Chi-Squared = 39.89 using 59 PHA bins.
# Reduced chi-squared = 0.6998 for 57 degrees of freedom
# Null hypothesis probability = 9.585954e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.288e-09 1.045e-09
25- 50 3.235e-09 8.012e-10
50-150 7.041e-10 3.560e-10
15-150 8.227e-09 1.910e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.22300 (-4.223 2.18706)
R1^2/D10^2 : 63.2040 (-63.204 -63.204)
kT2 [keV] : 8.83373 (-8.83373 90.0142)
R2^2/D10^2 : 1.49784 (-1.49784 30.667)
------------------------------------------------------------
# Chi-Squared = 39.34 using 59 PHA bins.
# Reduced chi-squared = 0.7152 for 55 degrees of freedom
# Null hypothesis probability = 9.451589e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.261e-09 2.451e-09
25- 50 3.421e-09 1.862e-09
50-150 7.600e-10 5.773e-10
15-150 8.441e-09 4.380e-09
Peak spectrum fit
Power-law model
Time interval is from -0.456 sec. to 0.544 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.35416 ( -1.14508 1.94875 )
Norm@50keV : 8.79872E-04 ( -0.000879872 0.0013425 )
------------------------------------------------------------
# Chi-Squared = 55.21 using 59 PHA bins.
# Reduced chi-squared = 0.9686 for 57 degrees of freedom
# Null hypothesis probability = 5.425693e-01
Photon flux (15-150 keV) in 1 sec: 0.316641 ( -0.143325 0.14559 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26987e-08 ( -6.91732e-09 9.21892e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.456 sec. to 0.544 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 5.90950E-03 ( )
------------------------------------------------------------
# Chi-Squared = 60.91 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 56 degrees of freedom
# Null hypothesis probability = 3.037727e-01
Photon flux (15-150 keV) in 1 sec: 0.315667 ( -0.145226 0.145879 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25194e-16 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.456 sec. to 0.544 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.32569 ( -0.290159 -0.290159 )
beta : -3.92809 ( 3.99198 1.72363 )
Epeak [keV] : 15.7750 ( -13.0376 34.065 )
Norm@50keV : 3547.31 ( -3631.08 5.22799e+06 )
------------------------------------------------------------
# Chi-Squared = 54.72 using 59 PHA bins.
# Reduced chi-squared = 0.9950 for 55 degrees of freedom
# Null hypothesis probability = 4.851765e-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] : 3.86765 (-1.40729 2.2091)
R^2/D10^2 : 9.65646 (-9.65647 114.391)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 55.11 using 59 PHA bins.
# Reduced chi-squared = 0.9668 for 57 degrees of freedom
# Null hypothesis probability = 5.464650e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.444e-09 4.377e-09
25- 50 2.439e-09 1.672e-09
50-150 2.411e-11 2.906e-11
15-150 9.907e-09 6.160e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.7666 (-6.1692 25.9891)
Norm : 9.22735 (-9.22731 60.0947)
------------------------------------------------------------
# Chi-Squared = 55.25 using 59 PHA bins.
# Reduced chi-squared = 0.9692 for 57 degrees of freedom
# Null hypothesis probability = 5.411247e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.031e-09 4.345e-09
25- 50 3.333e-09 2.414e-09
50-150 2.779e-10 3.788e-10
15-150 1.064e-08 6.890e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.56999 (-3.552 2.11662)
R1^2/D10^2 : 13.6275 (-13.8885 -13.8885)
kT2 [keV] : 19.0736 (-18.4207 -18.4207)
R2^2/D10^2 : 4.24251E-03 (-0.00448724 -0.00448724)
------------------------------------------------------------
# Chi-Squared = 54.30 using 59 PHA bins.
# Reduced chi-squared = 0.9872 for 55 degrees of freedom
# Null hypothesis probability = 5.014100e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.250e-09 4.533e-09
25- 50 3.252e-09 1.942e-09
50-150 3.920e-09 3.463e-09
15-150 1.442e-08 8.680e-09
Plot creation:
Mon Feb 6 13:56:06 EST 2012