batgrbproduct Analysis for Trigger=504779
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 Oct 5 22:23:50 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger504779/GCN5_download_cron
======================================================================
Trigger: 00504779 Segment: 000
BAT Trigger Time: 339494721.664 [s; MET]
Trigger Stop: 339494729.856 [s; MET]
UTC: 2011-10-05T08:05:14.229140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 223.284218827626 Dec: -19.7304560018663 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.29
Image Trigger?: NO
Rate S/N Ratio: 10 [ if not an image trigger ]
Image S/N Ratio: 7.29
Flight Position: [ source = BAT ]
RA: 223.284218827626 Dec: -19.7304560018663 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 223.314944270878 Dec: -19.7219801525008 [deg; J2000]
{ 14h 53m 15.6s , -19d 43' 19.1" }
+/- 2.14764399773807 [arcmin] (estimated 90% radius based on SNR)
+/- 1.00507687296139 [arcmin] (formal 1-sigma fit error)
SNR: 10.2067278142485
Angular difference between Flight and Ground position is 1.808324 arcmin
Partial Coding Fraction: 0.4257812 [ including projection effects ]
Duration
T90: 26.1759999990463 +/- 6.40799503148109
Measured from: -4.27199983596802
to: 21.9040001630783 [s; relative to TRIGTIME]
T50: 11.0720000267029 +/- 4.58494233733747
Measured from: 1.04000014066696
to: 12.1120001673698 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.700000047683716
to: 1.70000004768372 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.23199999332428
to: 23.0560000538826 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.427540 0.448514 0.213033 0.033524
0.052243 0.052097 0.048861 0.053140 [error]
Peak 0.053104 0.035635 0.035744 -0.014619
0.010223 0.010206 0.009771 0.010000 [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 1.41e-07 1.88e-07 1.85e-07 3.26e-07 6.20e-07 8.40e-07 erg/cm2
Error 2.68e-08 2.64e-08 4.61e-08 1.60e-07 1.06e-07 2.13e-07 erg/cm2
Peak flux Power-law 4.72e-01 3.85e-01 2.12e-01 1.72e-01 1.15e+00 1.24e+00 ph/cm2/s
Error 1.72e-01 9.01e-02 8.37e-02 1.38e-01 2.69e-01 2.97e-01 ph/cm2/s
Fluence Cutoff-PL 1.34e-07 2.05e-07 1.72e-07 8.91e-08 5.68e-07 6.00e-07 erg/cm2
Error 2.91e-08 3.61e-08 5.89e-08 2.23e-07 1.23e-07 2.71e-07 erg/cm2
Peak flux Cutoff-PL 4.71e-01 3.85e-01 2.12e-01 1.71e-01 1.15e+00 1.24e+00 ph/cm2/s
Error 1.77e-01 9.02e-02 8.35e-02 1.69e-01 2.69e-01 3.10e-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 1.21e+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 2.025 0.266 - - 2.37e-03 4.31e-04 66.910 57
CPL 1.296 1.158 37.8 0.0 6.51e-03 0.00e+00 65.520 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.858 0.489 - - 8.12e-03 2.39e-03 38.040 57
CPL 1.860 2.067 9890.5 0.0 8.16e-03 0.00e+00 38.040 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 28.288 -5.232 23.056
T90 26.176 -4.272 21.904
T50 11.072 1.040 12.112
Peak 1.000 0.700 1.700
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
223.3149 -19.7220 0.0188 38.2 -43.5 1.1669 10.2 TRIG_00504779
------------------------------------------
Foreground time interval of the image:
-5.232 23.056 (delta_t = 28.288 [sec])
Background time interval of the image:
-239.664 -5.232 (delta_t = 234.432 [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 -5.232 sec. to 23.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02508 ( -0.257032 0.275609 )
Norm@50keV : 2.37423E-03 ( -0.000436598 0.000425615 )
------------------------------------------------------------
# Chi-Squared = 66.91 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 57 degrees of freedom
# Null hypothesis probability = 1.732994e-01
Photon flux (15-150 keV) in 28.29 sec: 0.360305 ( -0.0497261 0.0497318 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.20318e-07 ( -1.04048e-07 1.07894e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.232 sec. to 23.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29560 ( -1.45469 0.861452 )
Epeak [keV] : 37.8061 ( )
Norm@50keV : 6.51286E-03 ( )
------------------------------------------------------------
# Chi-Squared = 65.52 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 56 degrees of freedom
# Null hypothesis probability = 1.800831e-01
Photon flux (15-150 keV) in 28.29 sec: 0.350203 ( -0.025874 0.051615 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.68306e-07 ( -1.16869e-07 1.29591e-07 ) ergs/cm2
Band function
Time interval is from -5.232 sec. to 23.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.89992 ( -1.28731 -1.28731 )
beta : -2.30843 ( -2.30478 0.403765 )
Epeak [keV] : 25.6224 ( -26.8989 118.498 )
Norm@50keV : 10.1547 ( -9.91189 172.082 )
------------------------------------------------------------
# Chi-Squared = 64.38 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 55 degrees of freedom
# Null hypothesis probability = 1.812069e-01
Photon flux (15-150 keV) in 28.29 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] : 8.90737 (-1.35355 1.67153)
R^2/D10^2 : 0.259507 (-0.126832 0.237614)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 73.05 using 59 PHA bins.
# Reduced chi-squared = 1.282 for 57 degrees of freedom
# Null hypothesis probability = 7.455348e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.128e-07 2.658e-08
25- 50 2.359e-07 4.972e-08
50-150 8.717e-08 3.481e-08
15-150 4.358e-07 1.023e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 59.4864 (-20.3011 39.3883)
Norm : 1.89610 (-0.407604 0.53404)
------------------------------------------------------------
# Chi-Squared = 65.49 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 57 degrees of freedom
# Null hypothesis probability = 2.059590e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.346e-07 2.412e-08
25- 50 2.044e-07 3.383e-08
50-150 2.309e-07 9.580e-08
15-150 5.698e-07 1.084e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.36252 (-1.91685 1.87119)
R1^2/D10^2 : 0.744010 (-0.444271 1.55478)
kT2 [keV] : 21.8041 (-17.3989 32.5599)
R2^2/D10^2 : 5.05180E-03 (-0.00476123 0.0131369)
------------------------------------------------------------
# Chi-Squared = 63.90 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 55 degrees of freedom
# Null hypothesis probability = 1.923446e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.352e-07 7.127e-08
25- 50 2.049e-07 1.063e-07
50-150 2.519e-07 1.609e-07
15-150 5.920e-07 2.969e-07
Peak spectrum fit
Power-law model
Time interval is from 0.700 sec. to 1.700 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85829 ( -0.459465 0.518064 )
Norm@50keV : 8.12303E-03 ( -0.00248182 0.00230053 )
------------------------------------------------------------
# Chi-Squared = 38.04 using 59 PHA bins.
# Reduced chi-squared = 0.6674 for 57 degrees of freedom
# Null hypothesis probability = 9.748957e-01
Photon flux (15-150 keV) in 1 sec: 1.14564 ( -0.269152 0.269359 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.46818e-08 ( -2.14227e-08 2.24337e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.700 sec. to 1.700 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86015 ( -1.35939 2.77433 )
Epeak [keV] : 9890.46 ( )
Norm@50keV : 8.16035E-03 ( )
------------------------------------------------------------
# Chi-Squared = 38.04 using 59 PHA bins.
# Reduced chi-squared = 0.6793 for 56 degrees of freedom
# Null hypothesis probability = 9.683691e-01
Photon flux (15-150 keV) in 1 sec: 1.14510 ( -0.269051 0.26826 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.48077e-08 ( -2.15528e-08 2.22433e-08 ) ergs/cm2
Band function
Time interval is from 0.700 sec. to 1.700 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.86836 ( 1.86243 1.36332 )
beta : -9.37165 ( 6.57997 9.99982 )
Epeak [keV] : 9999.33 ( -7670.08 -7670.08 )
Norm@50keV : 8.08604E-03 ( -0.00216047 0.0222652 )
------------------------------------------------------------
# Chi-Squared = 38.04 using 59 PHA bins.
# Reduced chi-squared = 0.6917 for 55 degrees of freedom
# Null hypothesis probability = 9.604375e-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] : 12.5395 (-4.95097 6.57391)
R^2/D10^2 : 0.218463 (-0.163254 1.15532)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 46.94 using 59 PHA bins.
# Reduced chi-squared = 0.8234 for 57 degrees of freedom
# Null hypothesis probability = 8.266874e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.283e-09 3.450e-09
25- 50 2.411e-08 1.376e-08
50-150 2.345e-08 1.518e-08
15-150 5.484e-08 2.585e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.7441 (-57.7609 -99.8176)
Norm : 4.99144 (-1.39629 2.39175)
------------------------------------------------------------
# Chi-Squared = 38.83 using 59 PHA bins.
# Reduced chi-squared = 0.6813 for 57 degrees of freedom
# Null hypothesis probability = 9.686417e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.305e-08 4.200e-09
25- 50 2.255e-08 6.640e-09
50-150 3.648e-08 1.151e-08
15-150 7.208e-08 1.855e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.05317 (-1.54963 2.4396)
R1^2/D10^2 : 14.4057 (-12.6112 172.837)
kT2 [keV] : 21.4810 (-7.41319 16.5185)
R2^2/D10^2 : 2.75944E-02 (-0.0233631 0.0952167)
------------------------------------------------------------
# Chi-Squared = 36.09 using 59 PHA bins.
# Reduced chi-squared = 0.6561 for 55 degrees of freedom
# Null hypothesis probability = 9.772245e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.634e-08 9.515e-09
25- 50 1.765e-08 9.225e-09
50-150 4.283e-08 2.786e-08
15-150 7.683e-08 3.993e-08
Plot creation:
Wed Oct 5 22:37:03 EDT 2011