batgrbproduct Analysis for Trigger=436981
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): Sun Oct 24 11:48:07 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger436981/GCN5_download_cron
======================================================================
Trigger: 00436981 Segment: 000
BAT Trigger Time: 309567018.688 [s; MET]
Trigger Stop: 309567019.712 [s; MET]
UTC: 2010-10-23T22:50:12.387740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 317.954259194012 Dec: -65.3938290160607 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.54
Image Trigger?: NO
Rate S/N Ratio: 16.6733320005331 [ if not an image trigger ]
Image S/N Ratio: 8.54
Flight Position: [ source = BAT ]
RA: 317.954259194012 Dec: -65.3938290160607 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 317.949199394653 Dec: -65.3889080095459 [deg; J2000]
{ 21h 11m 47.8s , -65d 23' 20.1" }
+/- 1.38489406454034 [arcmin] (estimated 90% radius based on SNR)
+/- 0.625765552778392 [arcmin] (formal 1-sigma fit error)
SNR: 19.1026989518477
Angular difference between Flight and Ground position is 0.321186 arcmin
Partial Coding Fraction: 0.1103516 [ including projection effects ]
Duration
T90: 80.6839999556541 +/- 2.0932845145742
Measured from: 0.8960000872612
to: 81.5800000429153 [s; relative to TRIGTIME]
T50: 14.9639999270439 +/- 1.09456839931268
Measured from: 49.7040001153946
to: 64.6680000424385 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 57.3439999818802
to: 58.3439999818802 [s; relative to TRIGTIME]
Total Fluence
Measured from: -10.9800000190735
to: 137.255999982357 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 11.871965 16.093373 12.094901 2.767569
0.143350 0.158866 0.153784 0.162649 [error]
Peak 0.554149 0.967587 0.934883 0.278571
0.011887 0.015078 0.015628 0.011579 [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 4.53e-06 7.51e-06 9.43e-06 2.36e-05 2.81e-05 4.51e-05 erg/cm2
Error 1.63e-07 1.54e-07 1.90e-07 1.12e-06 4.76e-07 1.19e-06 erg/cm2
Peak flux Power-law 2.91e+01 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
Fluence Cutoff-PL 4.05e-06 7.62e-06 9.74e-06 1.47e-05 2.73e-05 3.61e-05 erg/cm2
Error 2.22e-07 1.62e-07 2.20e-07 2.33e-06 5.51e-07 2.40e-06 erg/cm2
Peak flux Cutoff-PL 5.94e+00 7.83e+00 6.62e+00 5.66e+00 2.32e+01 2.60e+01 ph/cm2/s
Error 2.06e-01 1.57e-01 1.49e-01 6.87e-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 1.670 0.033 - - 2.04e-02 3.43e-04 69.290 57
CPL 1.258 0.149 101.1 18.9 3.11e-02 4.62e-03 45.080 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 1.251 0.000 - - 1.98e-01 0.00e+00 120.930 57
CPL 0.825 0.107 144.6 24.6 3.22e-01 3.85e-02 70.100 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: 74.944000 sec.
T50 in the 50-300 keV band: 9.536000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 148.236 -10.980 137.256
T90 80.684 0.896 81.580
T50 14.964 49.704 64.668
Peak 1.000 57.344 58.344
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
317.9492 -65.3889 0.0099 41.2 -113.0 5.7477 19.1 TRIG_00436981
------------------------------------------
Foreground time interval of the image:
-10.980 11.913 (delta_t = 22.893 [sec])
Background time interval of the image:
-180.187 -10.980 (delta_t = 169.207 [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 -10.980 sec. to 137.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67031 ( -0.0329608 0.0329759 )
Norm@50keV : 2.04126E-02 ( -0.000343227 0.000343216 )
------------------------------------------------------------
# Chi-Squared = 69.29 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 57 degrees of freedom
# Null hypothesis probability = 1.274372e-01
Photon flux (15-150 keV) in 148.2 sec: 2.68350 ( -0.0549713 0.0552339 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80802e-05 ( -4.76266e-07 4.76356e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.980 sec. to 137.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25774 ( -0.15087 0.146253 )
Epeak [keV] : 101.103 ( -12.9022 24.8473 )
Norm@50keV : 3.10558E-02 ( -0.00420641 0.00503496 )
------------------------------------------------------------
# Chi-Squared = 45.08 using 59 PHA bins.
# Reduced chi-squared = 0.8049 for 56 degrees of freedom
# Null hypothesis probability = 8.517848e-01
Photon flux (15-150 keV) in 148.2 sec: 2.57706 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.72944e-05 ( -5.52045e-07 5.4997e-07 ) ergs/cm2
Band function
Time interval is from -10.980 sec. to 137.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01642 ( -0.280756 0.411563 )
beta : -1.88560 ( -0.421867 0.100894 )
Epeak [keV] : 75.2213 ( -17.4794 28.4618 )
Norm@50keV : 4.19376E-02 ( -0.0118401 0.0301333 )
------------------------------------------------------------
# Chi-Squared = 42.29 using 59 PHA bins.
# Reduced chi-squared = 0.7689 for 55 degrees of freedom
# Null hypothesis probability = 8.953593e-01
Photon flux (15-150 keV) in 148.2 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 57.344 sec. to 58.344 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25080 ( )
Norm@50keV : 0.197628 ( )
------------------------------------------------------------
# Chi-Squared = 120.93 using 59 PHA bins.
# Reduced chi-squared = 2.1216 for 57 degrees of freedom
# Null hypothesis probability = 1.683702e-06
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from 57.344 sec. to 58.344 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.824636 ( -0.108272 0.105673 )
Epeak [keV] : 144.625 ( -19.0406 30.0892 )
Norm@50keV : 0.321820 ( -0.0357407 0.0412205 )
------------------------------------------------------------
# Chi-Squared = 70.10 using 59 PHA bins.
# Reduced chi-squared = 1.252 for 56 degrees of freedom
# Null hypothesis probability = 9.736211e-02
Photon flux (15-150 keV) in 1 sec: 23.1971 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93987e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 57.344 sec. to 58.344 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.664788 ( -0.185053 0.230364 )
beta : -1.54712 ( -0.293333 0.104472 )
Epeak [keV] : 108.607 ( -24.8368 38.1946 )
Norm@50keV : 0.400870 ( -0.0854416 0.151674 )
------------------------------------------------------------
# Chi-Squared = 66.61 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 55 degrees of freedom
# Null hypothesis probability = 1.356233e-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:
Sun Oct 24 12:15:58 EDT 2010