batgrbproduct Analysis for Trigger=440635
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 20 05:11:20 EST 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger440635/GCN5_download_cron
======================================================================
Trigger: 00440635 Segment: 000
BAT Trigger Time: 314468880 [s; MET]
Trigger Stop: 314468944 [s; MET]
UTC: 2010-12-19T16:27:53.519740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 12.2568493213087 Dec: -34.5318517989712 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.63
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.63
Flight Position: [ source = BAT ]
RA: 12.2568493213087 Dec: -34.5318517989712 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 12.2262128541186 Dec: -34.6085101072982 [deg; J2000]
{ 00h 48m 54.3s , -34d 36' 30.6" }
+/- 3.02283429527782 [arcmin] (estimated 90% radius based on SNR)
+/- 1.5579806989265 [arcmin] (formal 1-sigma fit error)
SNR: 6.26342928894842
Angular difference between Flight and Ground position is 4.842152 arcmin
Partial Coding Fraction: 0.07226562 [ including projection effects ]
Duration
T90: 41.9520000219345 +/- 5.42062428630735
Measured from: 16.6160001158714
to: 58.5680001378059 [s; relative to TRIGTIME]
T50: 24.6240000128746 +/- 9.80524924400558
Measured from: 24.2160001397133
to: 48.8400001525879 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 26.5400000214577
to: 27.5400000214577 [s; relative to TRIGTIME]
Total Fluence
Measured from: 15.3040000200272
to: 60.9520000219345 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.179941 1.722291 1.100233 -0.153822
0.172199 0.191786 0.187849 0.213912 [error]
Peak 0.019627 0.099193 0.111713 0.007320
0.029159 0.028940 0.030074 0.033645 [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 4.65e-07 7.34e-07 8.73e-07 2.02e-06 2.66e-06 4.09e-06 erg/cm2
Error 9.06e-08 9.78e-08 1.83e-07 8.55e-07 4.31e-07 1.04e-06 erg/cm2
Peak flux Power-law 5.16e-01 6.49e-01 5.95e-01 9.52e-01 2.08e+00 2.71e+00 ph/cm2/s
Error 3.38e-01 2.72e-01 2.28e-01 7.67e-01 7.57e-01 1.01e+00 ph/cm2/s
Fluence Cutoff-PL 4.19e-07 8.31e-07 8.46e-07 4.26e-07 2.39e-06 2.52e-06 erg/cm2
Error 1.04e-07 1.41e-07 2.26e-07 1.01e-06 4.84e-07 1.10e-06 erg/cm2
Peak flux Cutoff-PL 2.28e-01 7.64e-01 6.99e-01 9.39e-02 1.78e+00 1.78e+00 ph/cm2/s
Error 3.44e-01 3.70e-01 3.41e-01 9.31e-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 2.06e+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 1.749 0.238 - - 6.31e-03 9.80e-04 47.530 57
CPL 0.686 1.248 53.0 199.6 2.52e-02 7.98e-02 44.650 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 1.127 0.585 - - 1.79e-02 6.33e-03 48.250 57
CPL -2.102 0.590 65.7 448.4 5.99e-01 1.93e+03 45.520 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 45.648 15.304 60.952
T90 41.952 16.616 58.568
T50 24.624 24.216 48.840
Peak 1.000 26.540 27.540
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
12.2262 -34.6085 0.0306 44.4 131.5 4.7308 6.3 TRIG_00440635
------------------------------------------
Foreground time interval of the image:
15.304 60.952 (delta_t = 45.648 [sec])
Background time interval of the image:
-4.699 15.304 (delta_t = 20.003 [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 15.304 sec. to 60.952 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74910 ( -0.231419 0.243684 )
Norm@50keV : 6.30956E-03 ( -0.00099045 0.000969122 )
------------------------------------------------------------
# Chi-Squared = 47.53 using 59 PHA bins.
# Reduced chi-squared = 0.8338 for 57 degrees of freedom
# Null hypothesis probability = 8.101457e-01
Photon flux (15-150 keV) in 45.65 sec: 0.852883 ( -0.113841 0.113865 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.65797e-06 ( -4.25399e-07 4.36896e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 15.304 sec. to 60.952 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.686058 ( -1.43284 1.06343 )
Epeak [keV] : 53.0183 ( -12.8311 386.44 )
Norm@50keV : 2.51641E-02 ( -0.0186807 0.140822 )
------------------------------------------------------------
# Chi-Squared = 44.65 using 59 PHA bins.
# Reduced chi-squared = 0.7973 for 56 degrees of freedom
# Null hypothesis probability = 8.623896e-01
Photon flux (15-150 keV) in 45.65 sec: 0.818877 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3865e-06 ( -4.60677e-07 5.07646e-07 ) ergs/cm2
Band function
Time interval is from 15.304 sec. to 60.952 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.37315E-02 ( -2.5858 -0.330241 )
beta : -2.34532 ( 2.30842 0.618814 )
Epeak [keV] : 43.7561 ( -19.7224 24.0749 )
Norm@50keV : 6.69089E-02 ( -0.0649869 125.612 )
------------------------------------------------------------
# Chi-Squared = 44.30 using 59 PHA bins.
# Reduced chi-squared = 0.8055 for 55 degrees of freedom
# Null hypothesis probability = 8.485088e-01
Photon flux (15-150 keV) in 45.65 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 26.540 sec. to 27.540 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12681 ( -0.60559 0.564703 )
Norm@50keV : 1.79247E-02 ( -0.00633625 0.00631464 )
------------------------------------------------------------
# Chi-Squared = 48.25 using 59 PHA bins.
# Reduced chi-squared = 0.8465 for 57 degrees of freedom
# Null hypothesis probability = 7.887705e-01
Photon flux (15-150 keV) in 1 sec: 2.08453 ( -0.751467 0.762579 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85877e-07 ( -6.88244e-08 7.07338e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 26.540 sec. to 27.540 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.10240 ( 2.15643 3.33604 )
Epeak [keV] : 65.7412 ( -18.78 877.946 )
Norm@50keV : 0.598662 ( -0.81136 3852.93 )
------------------------------------------------------------
# Chi-Squared = 45.52 using 59 PHA bins.
# Reduced chi-squared = 0.8129 for 56 degrees of freedom
# Null hypothesis probability = 8.402269e-01
Photon flux (15-150 keV) in 1 sec: 1.77807 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45667e-07 ( -6.68286e-08 8.4193e-08 ) ergs/cm2
Band function
Time interval is from 26.540 sec. to 27.540 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97794 ( -98.5739 -88.574 )
beta : -2.46706 ( 2.46957 1.37744 )
Epeak [keV] : 53.3018 ( -25.1184 18.1615 )
Norm@50keV : 19.9437 ( -19.9002 14.7904 )
------------------------------------------------------------
# Chi-Squared = 44.94 using 59 PHA bins.
# Reduced chi-squared = 0.8170 for 55 degrees of freedom
# Null hypothesis probability = 8.316140e-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 20 05:27:46 EST 2010