batgrbproduct Analysis for Trigger=503652
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): Thu Sep 22 03:29:56 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger503652/GCN5_download_cron
======================================================================
Trigger: 00503652 Segment: 000
BAT Trigger Time: 338305887.552 [s; MET]
Trigger Stop: 338305891.648 [s; MET]
UTC: 2011-09-21T13:51:20.163880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 294.077815153217 Dec: 36.376808367908 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.66
Image Trigger?: NO
Rate S/N Ratio: 15.0332963783729 [ if not an image trigger ]
Image S/N Ratio: 9.66
Flight Position: [ source = BAT ]
RA: 294.077815153217 Dec: 36.376808367908 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 294.09435089028 Dec: 36.3554624647236 [deg; J2000]
{ 19h 36m 22.6s , +36d 21' 19.7" }
+/- 1.68803077547962 [arcmin] (estimated 90% radius based on SNR)
+/- 0.768773200002166 [arcmin] (formal 1-sigma fit error)
SNR: 14.3975731564764
Angular difference between Flight and Ground position is 1.509504 arcmin
Partial Coding Fraction: 0.15625 [ including projection effects ]
Duration
T90: 48 +/- 22.6274169979695
Measured from: -31.5519998669624
to: 16.4480001330376 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: -15.5519998669624
to: 0.448000133037567 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.94800001382828
to: 8.94800001382828 [s; relative to TRIGTIME]
Total Fluence
Measured from: -31.5519999861717
to: 16.4480000138283 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.924005 1.312005 0.948950 0.319272
0.114068 0.113006 0.101745 0.098417 [error]
Peak -0.001670 0.035889 0.027910 0.031557
0.015998 0.016567 0.014776 0.014258 [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 3.48e-07 6.12e-07 8.23e-07 2.27e-06 2.39e-06 4.06e-06 erg/cm2
Error 5.95e-08 6.24e-08 1.03e-07 6.26e-07 2.49e-07 6.99e-07 erg/cm2
Peak flux Power-law 6.67e-04 5.80e-03 4.51e-02 2.06e+00 1.72e-01 1.16e+00 ph/cm2/s
Error 1.07e-01 1.34e-01 1.42e-01 1.61e+00 4.40e-01 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 3.48e-07 6.13e-07 8.24e-07 2.26e-06 2.39e-06 4.05e-06 erg/cm2
Error 5.85e-08 6.32e-08 1.04e-07 9.57e-07 2.48e-07 7.99e-07 erg/cm2
Peak flux Cutoff-PL 4.51e-04 4.62e-03 4.22e-02 1.53e-02 5.05e+00 1.81e-01 ph/cm2/s
Error 9.74e-02 1.27e-01 2.63e+00 0.00e+00 0.00e+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 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL 1.577 0.357 9999.4 0.0 5.32e-03 4.07e-03 41.020 56
The chi2 of BB fit is 76.08 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 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL -2.817 1.502 10000.0 0.0 1.76e-04 0.00e+00 58.130 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: 13.632000 sec.
T50 in the 50-300 keV band: 6.208000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 48.000 -31.552 16.448
T90 48.000 -31.552 16.448
T50 16.000 -15.552 0.448
Peak 1.000 7.948 8.948
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
294.0944 +36.3555 0.0133 47.4 22.9 3.6861 14.4 TRIG_00503652
------------------------------------------
Foreground time interval of the image:
-31.552 16.448 (delta_t = 48.000 [sec])
Background time interval of the image:
-239.552 -31.552 (delta_t = 208.000 [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 -31.552 sec. to 16.448 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 48 sec: 0.676627 ( -0.067547 0.0678584 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39172e-06 ( -2.47761e-07 2.49423e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -31.552 sec. to 16.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57711 ( -0.54274 0.171837 )
Epeak [keV] : 9999.36 ( -10000 -10000 )
Norm@50keV : 5.32026E-03 ( -0.00532799 0.00280438 )
------------------------------------------------------------
# Chi-Squared = 41.02 using 59 PHA bins.
# Reduced chi-squared = 0.7325 for 56 degrees of freedom
# Null hypothesis probability = 9.333455e-01
Photon flux (15-150 keV) in 48 sec: 0.675796 ( -0.067031 0.068083 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39207e-06 ( -2.4745e-07 2.49331e-07 ) ergs/cm2
Band function
Time interval is from -31.552 sec. to 16.448 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
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] : 13.8094 (-1.78708 2.1904)
R^2/D10^2 : 9.79846E-02 (-0.0400849 0.0643913)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 76.08 using 59 PHA bins.
# Reduced chi-squared = 1.335 for 57 degrees of freedom
# Null hypothesis probability = 4.643738e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.897e-07 4.102e-08
25- 50 6.959e-07 9.288e-08
50-150 8.676e-07 1.757e-07
15-150 1.753e-06 2.237e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.360 (-76.5894 -199.846)
Norm : 2.74092 (-0.259922 0.261535)
------------------------------------------------------------
# Chi-Squared = 42.14 using 59 PHA bins.
# Reduced chi-squared = 0.7393 for 57 degrees of freedom
# Null hypothesis probability = 9.293815e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.276e-07 1.728e-07
25- 50 6.302e-07 3.326e-07
50-150 1.382e-06 7.342e-07
15-150 2.340e-06 1.216e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.27786 (-1.58509 1.73689)
R1^2/D10^2 : 0.486476 (-0.233748 0.332636)
kT2 [keV] : 43.2729 (-15.225 67.7758)
R2^2/D10^2 : 1.63176E-03 (-0.00142615 0.00449151)
------------------------------------------------------------
# Chi-Squared = 37.52 using 59 PHA bins.
# Reduced chi-squared = 0.6822 for 55 degrees of freedom
# Null hypothesis probability = 9.656286e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.143e-07 9.115e-08
25- 50 6.746e-07 2.151e-07
50-150 1.469e-06 7.368e-07
15-150 2.458e-06 9.137e-07
Peak spectrum fit
Power-law model
Time interval is from 7.948 sec. to 8.948 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: 0.171649 ( -0.171649 0.707361 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08588e-08 ( -3.08588e-08 6.07408e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.948 sec. to 8.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.81666 ( -0.574219 2.42946 )
Epeak [keV] : 10000.00 ( )
Norm@50keV : 1.75909E-04 ( )
------------------------------------------------------------
# Chi-Squared = 58.13 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 56 degrees of freedom
# Null hypothesis probability = 3.966975e-01
Photon flux (15-150 keV) in 1 sec: 0.180707 0.165389 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.14263e-08 ( -3.14263e-08 5.46653e-08 ) ergs/cm2
Band function
Time interval is from 7.948 sec. to 8.948 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
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] : 199.297 (-197.97 -197.97)
R^2/D10^2 : 2.34762E-04 (-0.00011905 0.017096)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 60.82 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 57 degrees of freedom
# Null hypothesis probability = 3.401088e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.004e-10 6.065e-11
25- 50 2.552e-09 2.863e-10
50-150 6.213e-08 7.130e-10
15-150 6.498e-08 1.394e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.961 -199.961)
Norm : 3.08457 (-1.74231 1.7424)
------------------------------------------------------------
# Chi-Squared = 62.87 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 57 degrees of freedom
# Null hypothesis probability = 2.763761e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.681e-09 4.873e-09
25- 50 1.477e-08 9.630e-09
50-150 3.240e-08 2.168e-08
15-150 5.486e-08 3.731e-08
Double BB
R1^2/D10^2 : 2.67771E+08 (-1.39677e+07 2.23279e+08)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 2.33102E-04 (-0.00011897 0.000118953)
------------------------------------------------------------
# Chi-Squared = 60.82 using 59 PHA bins.
# Chi-Squared = 58.71 using 59 PHA bins.
# Chi-Squared = 58.38 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 55 degrees of freedom
# Reduced chi-squared = 1.068 for 55 degrees of freedom
# Reduced chi-squared = 1.061 for 55 degrees of freedom
# Null hypothesis probability = 2.744289e-01
# Null hypothesis probability = 3.410417e-01
# Null hypothesis probability = 3.523822e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Thu Sep 22 03:48:15 EDT 2011