batgrbproduct Analysis for Trigger=457330
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): Sat Jul 16 10:00:43 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger457330/GCN5_download_cron
======================================================================
Trigger: 00457330 Segment: 000
BAT Trigger Time: 332428438.144 [s; MET]
Trigger Stop: 332428438.272 [s; MET]
UTC: 2011-07-15T13:13:50.984920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 237.659654001492 Dec: -46.2333229577073 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.86
Image Trigger?: NO
Rate S/N Ratio: 31.3368792319848 [ if not an image trigger ]
Image S/N Ratio: 11.86
Flight Position: [ source = BAT ]
RA: 237.659654001492 Dec: -46.2333229577073 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 237.665595252731 Dec: -46.2373007104566 [deg; J2000]
{ 15h 50m 39.7s , -46d 14' 14.3" }
+/- 0.449322521902475 [arcmin] (estimated 90% radius based on SNR)
+/- 0.105550491172396 [arcmin] (formal 1-sigma fit error)
SNR: 95.38142928522
Angular difference between Flight and Ground position is 0.343161 arcmin
Partial Coding Fraction: 0.6953125 [ including projection effects ]
Duration
T90: 13 +/- 4
Measured from: -0.143999874591827
to: 12.8560001254082 [s; relative to TRIGTIME]
T50: 2 +/- 1
Measured from: 0.856000125408173
to: 2.85600012540817 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.85600000619888
to: 2.85600000619888 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.14399999380112
to: 20.8560000061989 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.803042 7.256883 5.410276 1.232993
0.058562 0.061118 0.054066 0.036897 [error]
Peak 1.381723 2.336333 2.072522 0.546866
0.022660 0.028404 0.027691 0.016640 [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 1.85e-06 3.14e-06 4.07e-06 1.06e-05 1.20e-05 1.97e-05 erg/cm2
Error 5.96e-08 6.01e-08 6.60e-08 3.94e-07 1.77e-07 4.16e-07 erg/cm2
Peak flux Power-law 1.64e+01 1.76e+01 1.35e+01 1.68e+01 5.39e+01 6.44e+01 ph/cm2/s
Error 6.10e-01 3.99e-01 2.52e-01 6.69e-01 1.09e+00 1.12e+00 ph/cm2/s
Fluence Cutoff-PL 1.65e-06 3.18e-06 4.24e-06 7.26e-06 1.18e-05 1.63e-05 erg/cm2
Error 7.98e-08 6.29e-08 8.31e-08 8.18e-07 1.88e-07 8.34e-07 erg/cm2
Peak flux Cutoff-PL 1.45e+01 1.78e+01 1.42e+01 1.22e+01 5.24e+01 5.87e+01 ph/cm2/s
Error 8.10e-01 4.17e-01 3.32e-01 1.22e+00 1.16e+00 1.79e+00 ph/cm2/s
Fluence Band 1.51e-06 3.24e-06 4.14e-06 9.41e-06 1.17e-05 1.83e-05 erg/cm2
Error 1.07e-07 7.59e-08 8.24e-08 5.68e-07 1.93e-07 5.76e-07 erg/cm2
Peak flux Band 1.37e+01 1.78e+01 6.08e+01 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 1.52e+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 1.626 0.027 - - 5.35e-02 8.10e-04 81.540 57
CPL 1.254 0.116 119.8 20.8 7.68e-02 8.48e-03 49.650 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.388 0.031 - - 4.44e-01 7.85e-03 81.320 57
CPL 0.985 0.131 152.0 32.6 6.56e-01 8.15e-02 51.540 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: 4.032000 sec.
T50 in the 50-300 keV band: 1.344000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 24.000 -3.144 20.856
T90 13.000 -0.144 12.856
T50 2.000 0.856 2.856
Peak 1.000 1.856 2.856
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
237.6656 -46.2373 0.0020 34.1 -179.1 18.1347 95.4 TRIG_00457330
------------------------------------------
Foreground time interval of the image:
-3.144 11.457 (delta_t = 14.601 [sec])
Background time interval of the image:
-239.144 -3.144 (delta_t = 236.000 [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 -3.144 sec. to 20.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62635 ( -0.0271612 0.0271104 )
Norm@50keV : 5.35165E-02 ( -0.000809832 0.000809347 )
------------------------------------------------------------
# Chi-Squared = 81.54 using 59 PHA bins.
# Reduced chi-squared = 1.431 for 57 degrees of freedom
# Null hypothesis probability = 1.815403e-02
Photon flux (15-150 keV) in 24 sec: 6.93444 ( -0.131186 0.13172 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19752e-05 ( -1.77153e-07 1.77153e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.144 sec. to 20.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25419 ( -0.117752 0.114996 )
Epeak [keV] : 119.779 ( -14.9646 26.5884 )
Norm@50keV : 7.68057E-02 ( -0.00792535 0.00903674 )
------------------------------------------------------------
# Chi-Squared = 49.65 using 59 PHA bins.
# Reduced chi-squared = 0.8866 for 56 degrees of freedom
# Null hypothesis probability = 7.125762e-01
Photon flux (15-150 keV) in 24 sec: 6.69540 ( -0.14595 0.14701 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17776e-05 ( -1.8756e-07 1.87464e-07 ) ergs/cm2
Band function
Time interval is from -3.144 sec. to 20.856 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.682290 ( -0.38648 0.658092 )
beta : -1.76821 ( -0.0735734 0.0582429 )
Epeak [keV] : 63.2464 ( -14.8318 22.9713 )
Norm@50keV : 0.162325 ( -0.0678991 0.260085 )
------------------------------------------------------------
# Chi-Squared = 41.79 using 59 PHA bins.
# Reduced chi-squared = 0.7599 for 55 degrees of freedom
# Null hypothesis probability = 9.052234e-01
Photon flux (15-150 keV) in 24 sec: 6.54793 ( 0.45207 -0.1699 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16754e-05 ( -1.16753e-05 -1.92792e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.7757 ( )
R^2/D10^2 : 0.400760 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 935.90 using 59 PHA bins.
# Reduced chi-squared = 16.419 for 57 degrees of freedom
# Null hypothesis probability = 2.952886e-159
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.109e-07 1.956e-08
25- 50 2.799e-06 6.600e-08
50-150 6.398e-06 1.380e-07
15-150 9.807e-06 1.536e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 197.091 ( )
Norm : 27.6346 (-0.450613 0.537699)
------------------------------------------------------------
# Chi-Squared = 48.93 using 59 PHA bins.
# Reduced chi-squared = 0.8585 for 57 degrees of freedom
# Null hypothesis probability = 7.676902e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.650e-06 8.336e-07
25- 50 3.173e-06 1.600e-06
50-150 6.954e-06 3.511e-06
15-150 1.178e-05 5.933e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.65327 (-0.484062 0.499278)
R1^2/D10^2 : 3.42128 (-0.573153 0.728541)
kT2 [keV] : 29.7730 (-1.70231 2.03106)
R2^2/D10^2 : 4.76494E-02 (-0.0105161 0.0121614)
------------------------------------------------------------
# Chi-Squared = 55.15 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 55 degrees of freedom
# Null hypothesis probability = 4.689618e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.331e-06 7.296e-08
25- 50 3.318e-06 8.760e-08
50-150 6.943e-06 1.944e-07
15-150 1.159e-05 2.664e-07
Peak spectrum fit
Power-law model
Time interval is from 1.856 sec. to 2.856 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38765 ( -0.0308707 0.0308168 )
Norm@50keV : 0.443740 ( -0.00785259 0.00784774 )
------------------------------------------------------------
# Chi-Squared = 81.32 using 59 PHA bins.
# Reduced chi-squared = 1.427 for 57 degrees of freedom
# Null hypothesis probability = 1.890456e-02
Photon flux (15-150 keV) in 1 sec: 53.8897 ( -1.08394 1.08656 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.29868e-06 ( -7.58415e-08 7.58414e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.856 sec. to 2.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.984903 ( -0.132731 0.129128 )
Epeak [keV] : 152.002 ( -23.025 42.2636 )
Norm@50keV : 0.656152 ( -0.0755265 0.0875304 )
------------------------------------------------------------
# Chi-Squared = 51.54 using 59 PHA bins.
# Reduced chi-squared = 0.9204 for 56 degrees of freedom
# Null hypothesis probability = 6.440943e-01
Photon flux (15-150 keV) in 1 sec: 52.4143 ( -1.1573 1.1628 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.24492e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 1.856 sec. to 2.856 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.984883 ( -0.0529904 0.179589 )
beta : -10.00000 ( 4.40339e+13 4.40339e+13 )
Epeak [keV] : 151.977 ( -23.0222 42.2565 )
Norm@50keV : 0.656108 ( -0.0755383 0.0875524 )
------------------------------------------------------------
# Chi-Squared = 51.54 using 59 PHA bins.
# Reduced chi-squared = 0.9371 for 55 degrees of freedom
# Null hypothesis probability = 6.075256e-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] : 19.4854 ( )
R^2/D10^2 : 2.54927 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 628.92 using 59 PHA bins.
# Reduced chi-squared = 11.034 for 57 degrees of freedom
# Null hypothesis probability = 2.489731e-97
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.885e-07 6.650e-09
25- 50 9.226e-07 2.610e-08
50-150 2.586e-06 7.050e-08
15-150 3.697e-06 6.800e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 230.092 ( )
------------------------------------------------------------
# Chi-Squared = 187.98 using 59 PHA bins.
# Reduced chi-squared = 3.2978 for 57 degrees of freedom
# Null hypothesis probability = 6.759903e-16
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.729e-07 2.896e-07
25- 50 1.102e-06 5.560e-07
50-150 2.417e-06 1.219e-06
15-150 4.092e-06 2.070e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.72669 (-0.623939 0.654782)
R1^2/D10^2 : 22.8471 (-4.60172 6.16948)
kT2 [keV] : 31.0801 (-1.91858 2.34054)
R2^2/D10^2 : 0.410045 (-0.0949919 0.108852)
------------------------------------------------------------
# Chi-Squared = 50.36 using 59 PHA bins.
# Reduced chi-squared = 0.9157 for 55 degrees of freedom
# Null hypothesis probability = 6.520967e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.937e-07 2.555e-08
25- 50 1.053e-06 3.750e-08
50-150 2.784e-06 1.020e-07
15-150 4.232e-06 1.330e-07
Plot creation:
Sat Jul 16 10:32:25 EDT 2011