batgrbproduct Analysis for Trigger=355303
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 v2.45
Process Start Time (local time): Tue Aug 11 11:08:32 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/355303
======================================================================
Trigger: 00355303 Segment: 000
BAT Trigger Time: 267250968 [s; MET]
Trigger Stop: 267250976.192 [s; MET]
UTC: 2009-06-21T04:22:43.155300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 10.9861581404119 Dec: 61.9679004327154 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.8
Image Trigger?: NO
Rate S/N Ratio: 7.28010988928052 [ if not an image trigger ]
Image S/N Ratio: 7.8
Flight Position: [ source = BAT ]
RA: 10.9861581404119 Dec: 61.9679004327154 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 10.9851072586115 Dec: 61.9391426772234 [deg; J2000]
{ 00h 43m 56.4s , +61d 56' 20.9" }
+/- 1.71502749355647 [arcmin] (estimated 90% radius based on SNR)
+/- 0.656272574914316 [arcmin] (formal 1-sigma fit error)
SNR: 14.0749026314218
Angular difference between Flight and Ground position is 1.725720 arcmin
Partial Coding Fraction: 0.7734375 [ including projection effects ]
Duration
T90: 219.076000005007 +/- 72.2732915725468
Measured from: -1.3759999871254
to: 217.700000017881 [s; relative to TRIGTIME]
T50: 106.504000008106 +/- 60.4780773470141
Measured from: 77.3199999928474
to: 183.824000000954 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 240.291999995708
to: 241.291999995708 [s; relative to TRIGTIME]
Total Fluence
Measured from: -30.6920000016689
to: 241.747999995947 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.623346 1.941308 1.308096 0.190852
0.083779 0.086650 0.076325 0.066552 [error]
Peak 0.100562 0.114107 0.066591 0.017786
0.006301 0.006480 0.005536 0.004135 [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 5.07e-07 8.25e-07 1.01e-06 2.46e-06 3.04e-06 4.81e-06 erg/cm2
Error 4.56e-08 4.46e-08 7.73e-08 4.01e-07 1.81e-07 4.63e-07 erg/cm2
Peak flux Power-law 1.02e+00 8.55e-01 4.89e-01 4.15e-01 2.54e+00 2.78e+00 ph/cm2/s
Error 9.02e-02 5.17e-02 4.64e-02 7.52e-02 1.54e-01 1.73e-01 ph/cm2/s
Fluence Cutoff-PL 4.75e-07 8.55e-07 1.03e-06 1.37e-06 2.94e-06 3.74e-06 erg/cm2
Error 5.47e-08 5.37e-08 8.23e-08 7.91e-07 2.05e-07 5.99e-07 erg/cm2
Peak flux Cutoff-PL 1.00e+00 8.77e-01 4.91e-01 3.12e-01 2.53e+00 2.68e+00 ph/cm2/s
Error 9.74e-02 6.78e-02 4.81e-02 1.52e-01 1.56e-01 2.79e-01 ph/cm2/s
Fluence Band 4.71e-07 8.52e-07 1.03e-06 1.38e-06 2.94e-06 3.74e-06 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 8.97e-01 8.29e-01 4.49e-01 3.55e-01 2.34e+00 2.53e+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 1.701 0.099 - - 1.21e-03 6.78e-05 72.120 57
CPL 1.310 0.395 85.9 253.0 1.91e-03 9.14e-04 68.950 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 1.807 0.108 - - 1.84e-02 1.33e-03 53.110 57
CPL 1.616 0.313 87.4 -23.5 2.37e-02 1.19e-02 52.410 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: 188.736000 sec.
T50 in the 50-300 keV band: 98.240000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 272.440 -30.692 241.748
T90 219.076 -1.376 217.700
T50 106.504 77.320 183.824
Peak 1.000 240.292 241.292
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
10.9851 +61.9391 0.0136 27.7 -35.8 1.5826 14.1 TRIG_00355303
------------------------------------------
Foreground time interval of the image:
-30.692 50.301 (delta_t = 80.993 [sec])
Background time interval of the image:
-239.000 -30.692 (delta_t = 208.308 [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 -30.692 sec. to 241.748 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70145 ( -0.0981391 0.0993784 )
Norm@50keV : 1.20714E-03 ( -6.79706e-05 6.75781e-05 )
------------------------------------------------------------
# Chi-Squared = 72.12 using 59 PHA bins.
# Reduced chi-squared = 1.265 for 57 degrees of freedom
# Null hypothesis probability = 8.555948e-02
Photon flux (15-150 keV) in 272.4 sec: 0.160402 ( -0.00872463 0.00874086 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.04421e-06 ( -1.79932e-07 1.81146e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -30.692 sec. to 241.748 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31001 ( -0.412782 0.376811 )
Epeak [keV] : 85.9447 ( -22.5132 483.506 )
Norm@50keV : 1.91199E-03 ( -0.000667867 0.00116034 )
------------------------------------------------------------
# Chi-Squared = 68.95 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 56 degrees of freedom
# Null hypothesis probability = 1.145927e-01
Photon flux (15-150 keV) in 272.4 sec: 0.156637 ( -0.009401 0.009408 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94369e-06 ( -2.04354e-07 2.05035e-07 ) ergs/cm2
Band function
Time interval is from -30.692 sec. to 241.748 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31000 ( -0.278852 0.48651 )
beta : -10.00000 ( 1.05329e+15 1.05329e+15 )
Epeak [keV] : 85.9296 ( -22.5107 483.48 )
Norm@50keV : 1.91174E-03 ( -0.000668626 0.00116039 )
------------------------------------------------------------
# Chi-Squared = 68.95 using 59 PHA bins.
# Reduced chi-squared = 1.254 for 55 degrees of freedom
# Null hypothesis probability = 9.776144e-02
Photon flux (15-150 keV) in 272.4 sec: 0.156641 ( -0.009405 0.009404 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94075e-06 ( -2.04109e-07 2.04654e-07 ) 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 240.292 sec. to 241.292 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80671 ( -0.10678 0.109539 )
Norm@50keV : 1.84034E-02 ( -0.00133802 0.00132047 )
------------------------------------------------------------
# Chi-Squared = 53.11 using 59 PHA bins.
# Reduced chi-squared = 0.9317 for 57 degrees of freedom
# Null hypothesis probability = 6.219187e-01
Photon flux (15-150 keV) in 1 sec: 2.54258 ( -0.153919 0.153923 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69384e-07 ( -1.25005e-08 1.26203e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 240.292 sec. to 241.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61589 ( -0.424773 0.201379 )
Epeak [keV] : 87.3950 ( -40.3025 -87.3979 )
Norm@50keV : 2.36618E-02 ( -0.00639049 0.0173746 )
------------------------------------------------------------
# Chi-Squared = 52.41 using 59 PHA bins.
# Reduced chi-squared = 0.9359 for 56 degrees of freedom
# Null hypothesis probability = 6.115849e-01
Photon flux (15-150 keV) in 1 sec: 2.52905 ( -0.1563 0.15615 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66257e-07 ( -1.413e-08 1.384e-08 ) ergs/cm2
Band function
Time interval is from 240.292 sec. to 241.292 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.05803 ( -10.3302 -2.61795 )
beta : -1.90533 ( -0.144996 0.142868 )
Epeak [keV] : 23.0080 ( -7.26293 49.3951 )
Norm@50keV : 136.991 ( -136.041 1901.55 )
------------------------------------------------------------
# Chi-Squared = 49.57 using 59 PHA bins.
# Reduced chi-squared = 0.9013 for 55 degrees of freedom
# Null hypothesis probability = 6.813123e-01
Photon flux (15-150 keV) in 1 sec: 2.33637 ( -0.14318 0.14245 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5558e-07 ( -1.2613e-08 1.2475e-08 ) 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:
Wed Jun 1 15:31:22 EDT 2011