batgrbproduct Analysis for Trigger=440285
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 Dec 13 15:07:06 EST 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger440285/SDC
======================================================================
Trigger: 00440285 Segment: 000
BAT Trigger Time: 313930169.536 [s; MET]
Trigger Stop: 313930170.56 [s; MET]
UTC: 2010-12-13T10:49:23.075680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 241.286254814334 Dec: 21.9147936617102 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.43
Image Trigger?: NO
Rate S/N Ratio: 19.723082923316 [ if not an image trigger ]
Image S/N Ratio: 7.43
Flight Position: [ source = BAT ]
RA: 241.286254814334 Dec: 21.9147936617102 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 241.297165903505 Dec: 21.9048865622002 [deg; J2000]
{ 16h 05m 11.3s , +21d 54' 17.6" }
+/- 1.07376667965736 [arcmin] (estimated 90% radius based on SNR)
+/- 0.379682305338248 [arcmin] (formal 1-sigma fit error)
SNR: 27.4764959606798
Angular difference between Flight and Ground position is 0.849855 arcmin
Partial Coding Fraction: 0.3164062 [ including projection effects ]
Duration
T90: 134.912000000477 +/- 38.4456395555966
Measured from: -1.07200002670288
to: 133.839999973774 [s; relative to TRIGTIME]
T50: 34.1120000481606 +/- 5.09152077636556
Measured from: 6.47999995946884
to: 40.5920000076294 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.259999990463257
to: 0.740000009536743 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.05599999427795
to: 197.135999977589 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.022782 2.417826 2.243470 0.619222
0.107091 0.106707 0.095989 0.082642 [error]
Peak 0.043310 0.088178 0.089806 0.033299
0.013289 0.013872 0.013022 0.010880 [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 6.92e-07 1.25e-06 1.73e-06 4.97e-06 4.97e-06 8.64e-06 erg/cm2
Error 6.25e-08 6.52e-08 9.77e-08 6.42e-07 2.38e-07 6.95e-07 erg/cm2
Peak flux Power-law 6.04e-01 7.08e-01 5.98e-01 8.55e-01 2.22e+00 2.76e+00 ph/cm2/s
Error 1.82e-01 1.34e-01 1.03e-01 3.02e-01 3.69e-01 4.42e-01 ph/cm2/s
Fluence Cutoff-PL 6.92e-07 1.25e-06 1.73e-06 4.94e-06 4.97e-06 8.61e-06 erg/cm2
Error 6.26e-08 6.52e-08 9.79e-08 6.37e-07 2.38e-07 6.91e-07 erg/cm2
Peak flux Cutoff-PL 4.42e-01 7.69e-01 6.82e-01 3.03e-01 2.10e+00 2.20e+00 ph/cm2/s
Error 2.21e-01 1.60e-01 1.35e-01 5.19e-01 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 1.532 0.086 - - 2.63e-03 1.20e-04 41.700 57
CPL 1.529 0.169 9999.5 0.0 2.64e-03 1.68e-03 41.720 56
The chi2 of BB fit is 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 1.244 0.258 - - 1.88e-02 2.96e-03 53.920 57
CPL -0.082 1.536 85.6 223.2 7.75e-02 2.55e-01 50.710 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: 54.080000 sec.
T50 in the 50-300 keV band: 19.904000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 200.192 -3.056 197.136
T90 134.912 -1.072 133.840
T50 34.112 6.480 40.592
Peak 1.000 -0.260 0.740
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
241.2972 +21.9049 0.0070 46.2 -30.8 3.2062 27.5 TRIG_00440285
------------------------------------------
Foreground time interval of the image:
-3.056 14.365 (delta_t = 17.421 [sec])
Background time interval of the image:
-239.536 -3.056 (delta_t = 236.480 [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 -3.056 sec. to 197.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53158 ( -0.0858065 0.0860998 )
Norm@50keV : 2.62957E-03 ( -0.00011967 0.000119641 )
------------------------------------------------------------
# Chi-Squared = 41.70 using 59 PHA bins.
# Reduced chi-squared = 0.7317 for 57 degrees of freedom
# Null hypothesis probability = 9.359331e-01
Photon flux (15-150 keV) in 200.2 sec: 0.331141 ( -0.0166497 0.0167203 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.96936e-06 ( -2.3783e-07 2.38686e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.056 sec. to 197.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52899 ( -0.224021 0.114821 )
Epeak [keV] : 9999.45 ( )
Norm@50keV : 2.63699E-03 ( -0.00263699 0.00071944 )
------------------------------------------------------------
# Chi-Squared = 41.72 using 59 PHA bins.
# Reduced chi-squared = 0.7450 for 56 degrees of freedom
# Null hypothesis probability = 9.222524e-01
Photon flux (15-150 keV) in 200.2 sec: 0.330968 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.97029e-06 ( -2.37918e-07 2.38779e-07 ) ergs/cm2
Band function
Time interval is from -3.056 sec. to 197.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22110 ( 1.22122 1.22122 )
beta : -1.53144 ( -0.0860625 0.0857064 )
Epeak [keV] : 35.2040 ( -35.0826 -35.0826 )
Norm@50keV : 5.32109E-03 ( -0.0053247 0.185257 )
------------------------------------------------------------
# Chi-Squared = 41.70 using 59 PHA bins.
# Reduced chi-squared = 0.7583 for 55 degrees of freedom
# Null hypothesis probability = 9.069502e-01
Photon flux (15-150 keV) in 200.2 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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Peak spectrum fit
Power-law model
Time interval is from -0.260 sec. to 0.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24396 ( -0.261037 0.255064 )
Norm@50keV : 1.87505E-02 ( -0.00296444 0.00295607 )
------------------------------------------------------------
# Chi-Squared = 53.92 using 59 PHA bins.
# Reduced chi-squared = 0.9460 for 57 degrees of freedom
# Null hypothesis probability = 5.913039e-01
Photon flux (15-150 keV) in 1 sec: 2.21554 ( -0.36745 0.369896 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87953e-07 ( -3.10765e-08 3.12534e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.260 sec. to 0.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -8.19582E-02 ( -1.80893 1.26225 )
Epeak [keV] : 85.5532 ( -23.1159 423.213 )
Norm@50keV : 7.75379E-02 ( -0.0775436 0.433375 )
------------------------------------------------------------
# Chi-Squared = 50.71 using 59 PHA bins.
# Reduced chi-squared = 0.9056 for 56 degrees of freedom
# Null hypothesis probability = 6.745573e-01
Photon flux (15-150 keV) in 1 sec: 2.10393 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76337e-07 ( -3.4652e-08 3.4197e-08 ) ergs/cm2
Band function
Time interval is from -0.260 sec. to 0.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.971728 ( -1.80975 3.62304 )
beta : -1.94198 ( 1.94364 0.685992 )
Epeak [keV] : 64.9617 ( -26.852 48.4065 )
Norm@50keV : 0.237644 ( -0.272305 29.9296 )
------------------------------------------------------------
# Chi-Squared = 49.70 using 59 PHA bins.
# Reduced chi-squared = 0.9036 for 55 degrees of freedom
# Null hypothesis probability = 6.766420e-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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Plot creation:
Mon Dec 13 15:51:49 EST 2010