batgrbproduct Analysis for Trigger=377487
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): Wed Dec 23 00:33:45 EST 2009
Host Name: heteswift
Current Working Dir: /net/raid16/BAT_GRB_process_2009/377487
======================================================================
Trigger: 00377487 Segment: 000
BAT Trigger Time: 281296750.08 [s; MET]
Trigger Stop: 281296751.104 [s; MET]
UTC: 2009-11-30T17:59:04.773120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 203.098397836289 Dec: 34.0753830112892 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.78
Image Trigger?: NO
Rate S/N Ratio: 14.2828568570857 [ if not an image trigger ]
Image S/N Ratio: 7.78
Flight Position: [ source = BAT ]
RA: 203.098397836289 Dec: 34.0753830112892 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 203.147291778021 Dec: 34.08692778743 [deg; J2000]
{ 13h 32m 35.4s , +34d 05' 12.9" }
+/- 1.31683350674608 [arcmin] (estimated 90% radius based on SNR)
+/- 0.559225521563301 [arcmin] (formal 1-sigma fit error)
SNR: 20.5286313723636
Angular difference between Flight and Ground position is 2.526577 arcmin
Partial Coding Fraction: 0.7734375 [ including projection effects ]
Duration
T90: 130.911999940872 +/- 24.0315634280469
Measured from: -21.7799999713898
to: 109.131999969482 [s; relative to TRIGTIME]
T50: 31.8879998922348 +/- 6.30764996930951
Measured from: 1.49200004339218
to: 33.379999935627 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0640000104904175
to: 1.06400001049042 [s; relative to TRIGTIME]
Total Fluence
Measured from: -28.6559999585152
to: 127.388000011444 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.082411 1.110622 0.576647 0.153630
0.067421 0.069829 0.061550 0.054287 [error]
Peak 0.036886 0.048177 0.036122 0.015742
0.006441 0.006848 0.006061 0.005043 [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 3.60e-07 4.58e-07 4.27e-07 6.98e-07 1.48e-06 1.94e-06 erg/cm2
Error 3.73e-08 3.41e-08 5.72e-08 1.83e-07 1.31e-07 2.48e-07 erg/cm2
Peak flux Power-law 2.91e-01 3.46e-01 2.98e-01 4.37e-01 1.09e+00 1.37e+00 ph/cm2/s
Error 8.30e-02 5.85e-02 4.88e-02 1.60e-01 1.58e-01 2.02e-01 ph/cm2/s
Fluence Cutoff-PL 3.44e-07 4.89e-07 4.08e-07 2.55e-07 1.39e-06 1.50e-06 erg/cm2
Error 4.07e-08 4.51e-08 6.71e-08 2.77e-07 1.51e-07 3.23e-07 erg/cm2
Peak flux Cutoff-PL 2.92e-01 3.47e-01 2.97e-01 4.31e-01 1.09e+00 1.36e+00 ph/cm2/s
Error 8.63e-02 5.70e-02 4.88e-02 1.59e-01 1.57e-01 1.61e-01 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 2.85e-01 3.45e-01 2.99e-01 4.41e-01 1.09e+00 1.38e+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 2.103 0.144 - - 1.02e-03 9.89e-05 59.120 57
CPL 1.533 0.558 33.0 0.0 2.21e-03 0.00e+00 55.850 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 1.217 0.264 - - 9.26e-03 1.29e-03 68.450 57
CPL 2.930 0.261 267.0 0.0 1.02e-03 0.00e+00 66.790 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: 23.360000 sec.
T50 in the 50-300 keV band: 7.424000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 156.044 -28.656 127.388
T90 130.912 -21.780 109.132
T50 31.888 1.492 33.380
Peak 1.000 0.064 1.064
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
203.1473 +34.0869 0.0094 28.7 7.4 1.6696 20.5 TRIG_00377487
------------------------------------------
Foreground time interval of the image:
-28.656 18.221 (delta_t = 46.877 [sec])
Background time interval of the image:
-339.379 -28.656 (delta_t = 310.723 [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 -28.656 sec. to 127.388 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.10342 ( -0.141098 0.146949 )
Norm@50keV : 1.02104E-03 ( -9.9673e-05 9.81447e-05 )
------------------------------------------------------------
# Chi-Squared = 59.12 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 57 degrees of freedom
# Null hypothesis probability = 3.978576e-01
Photon flux (15-150 keV) in 156 sec: 0.160907 ( -0.011858 0.0118619 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48038e-06 ( -1.2955e-07 1.3172e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -28.656 sec. to 127.388 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53349 ( -0.633392 0.482364 )
Epeak [keV] : 32.9700 ( )
Norm@50keV : 2.21138E-03 ( )
------------------------------------------------------------
# Chi-Squared = 55.85 using 59 PHA bins.
# Reduced chi-squared = 0.9973 for 56 degrees of freedom
# Null hypothesis probability = 4.804608e-01
Photon flux (15-150 keV) in 156 sec: 0.157116 ( -0.012326 0.012341 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39172e-06 ( -1.47715e-07 1.53769e-07 ) ergs/cm2
Band function
Time interval is from -28.656 sec. to 127.388 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.53350 ( -0.331096 0.615949 )
beta : -10.00000 ( 7.87167e+11 7.87167e+11 )
Epeak [keV] : 32.9628 ( -30.9692 12.5666 )
Norm@50keV : 2.21099E-03 ( -0.00107705 0.00302115 )
------------------------------------------------------------
# Chi-Squared = 55.85 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Null hypothesis probability = 4.426392e-01
Photon flux (15-150 keV) in 156 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 0.064 sec. to 1.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21691 ( -0.269142 0.258625 )
Norm@50keV : 9.25641E-03 ( -0.00128899 0.0012889 )
------------------------------------------------------------
# Chi-Squared = 68.45 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 57 degrees of freedom
# Null hypothesis probability = 1.424085e-01
Photon flux (15-150 keV) in 1 sec: 1.08917 ( -0.157759 0.158176 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.34673e-08 ( -1.44878e-08 1.46006e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.064 sec. to 1.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.93048 ( -0.276124 0.24502 )
Epeak [keV] : 267.042 ( -9999.77 -9999.77 )
Norm@50keV : 1.01755E-03 ( )
------------------------------------------------------------
# Chi-Squared = 66.79 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 56 degrees of freedom
# Null hypothesis probability = 1.532825e-01
Photon flux (15-150 keV) in 1 sec: 1.09020 ( -0.157554 0.15664 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.33007e-08 ( -1.36194e-08 1.47133e-08 ) ergs/cm2
Band function
Time interval is from 0.064 sec. to 1.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97210 ( -70.4504 -70.4504 )
beta : -1.24608 ( -0.281479 0.280809 )
Epeak [keV] : 21.6711 ( -21.6711 8.59727 )
Norm@50keV : 1725.26 ( -1725.89 285719 )
------------------------------------------------------------
# Chi-Squared = 68.06 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 55 degrees of freedom
# Null hypothesis probability = 1.111065e-01
Photon flux (15-150 keV) in 1 sec: 1.08896 ( -0.153299 0.15193 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.29577e-08 ( -6.7294e-09 1.43383e-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:
Fri May 27 10:45:51 EDT 2011