batgrbproduct Analysis for Trigger=350311
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 01:48:58 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/350311
======================================================================
Trigger: 00350311 Segment: 000
BAT Trigger Time: 262275134.016 [s; MET]
Trigger Stop: 262275135.04 [s; MET]
UTC: 2009-04-24T14:12:09.330200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 189.537885215137 Dec: 16.8295481175842 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 23.3
Image Trigger?: NO
Rate S/N Ratio: 255.998046867549 [ if not an image trigger ]
Image S/N Ratio: 23.3
Flight Position: [ source = BAT ]
RA: 189.537885215137 Dec: 16.8295481175842 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 189.530617829755 Dec: 16.8293315546786 [deg; J2000]
{ 12h 38m 07.3s , +16d 49' 45.6" }
+/- 0.837205618931088 [arcmin] (estimated 90% radius based on SNR)
+/- 0.320148458979512 [arcmin] (formal 1-sigma fit error)
SNR: 39.20651026792
Angular difference between Flight and Ground position is 0.417570 arcmin
Partial Coding Fraction: 0.1289062 [ including projection effects ]
Duration
T90: 49.4680000245571 +/- 2.27250697020751
Measured from: -0.124000012874603
to: 49.3440000116825 [s; relative to TRIGTIME]
T50: 3.36800000071526 +/- 0.048166349704769
Measured from: 0.680000007152557
to: 4.04800000786781 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0960000157356262
to: 0.903999984264374 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.740000009536743
to: 102.520000010729 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 8.179369 12.345452 9.925799 2.598847
0.131064 0.152744 0.143756 0.104011 [error]
Peak 1.757820 2.871438 2.812179 0.879762
0.048934 0.062862 0.064888 0.041465 [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 3.14e-06 5.61e-06 7.71e-06 2.19e-05 2.22e-05 3.84e-05 erg/cm2
Error 1.20e-07 1.26e-07 1.61e-07 1.06e-06 4.09e-07 1.13e-06 erg/cm2
Peak flux Power-law 1.92e+01 2.23e+01 1.87e+01 2.64e+01 6.97e+01 8.66e+01 ph/cm2/s
Error 6.99e-01 5.22e-01 5.03e-01 1.41e+00 1.53e+00 2.07e+00 ph/cm2/s
Fluence Cutoff-PL 2.88e-06 5.68e-06 7.95e-06 1.57e-05 2.19e-05 3.22e-05 erg/cm2
Error 1.61e-07 1.32e-07 1.95e-07 2.37e-06 4.38e-07 2.39e-06 erg/cm2
Peak flux Cutoff-PL 1.81e+01 2.32e+01 1.95e+01 1.81e+01 6.95e+01 7.90e+01 ph/cm2/s
Error 8.12e-01 6.36e-01 6.03e-01 2.65e+00 1.53e+00 2.90e+00 ph/cm2/s
Fluence Band 2.82e-06 5.60e-06 7.91e-06 1.59e-05 2.18e-05 3.05e-05 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 1.79e+01 2.36e+01 1.92e+01 2.20e+01 6.94e+01 8.28e+01 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 1.543 0.034 - - 2.28e-02 4.17e-04 57.440 57
CPL 1.244 0.140 147.8 51.3 3.07e-02 4.18e-03 43.350 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 1.257 0.035 - - 5.89e-01 1.31e-02 74.700 57
CPL 0.915 0.137 166.0 52.6 8.74e-01 1.36e-01 55.150 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: 8.192000 sec.
T50 in the 50-300 keV band: 3.008000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 103.260 -0.740 102.520
T90 49.468 -0.124 49.344
T50 3.368 0.680 4.048
Peak 1.000 -0.096 0.904
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
189.5306 +16.8293 0.0049 38.8 56.3 30.7355 39.2 TRIG_00350311
------------------------------------------
Foreground time interval of the image:
-0.740 15.685 (delta_t = 16.425 [sec])
Background time interval of the image:
-239.016 -0.740 (delta_t = 238.276 [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 -0.740 sec. to 102.520 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54318 ( -0.033941 0.0339261 )
Norm@50keV : 2.28398E-02 ( -0.000417202 0.000417104 )
------------------------------------------------------------
# Chi-Squared = 57.44 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 57 degrees of freedom
# Null hypothesis probability = 4.587913e-01
Photon flux (15-150 keV) in 103.3 sec: 2.88571 ( -0.0621978 0.0624203 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22331e-05 ( -4.09062e-07 4.09175e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.740 sec. to 102.520 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24377 ( -0.142236 0.138069 )
Epeak [keV] : 147.815 ( -29.2102 73.3644 )
Norm@50keV : 3.07314E-02 ( -0.00384124 0.00452077 )
------------------------------------------------------------
# Chi-Squared = 43.35 using 59 PHA bins.
# Reduced chi-squared = 0.7742 for 56 degrees of freedom
# Null hypothesis probability = 8.915311e-01
Photon flux (15-150 keV) in 103.3 sec: 2.81236 ( -0.06917 0.06963 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19109e-05 ( -4.38199e-07 4.37372e-07 ) ergs/cm2
Band function
Time interval is from -0.740 sec. to 102.520 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24376 ( -0.0558038 0.171049 )
beta : -10.00000 ( 4.40339e+13 4.40339e+13 )
Epeak [keV] : 147.789 ( -29.2053 73.3517 )
Norm@50keV : 3.07278E-02 ( -0.00384169 0.00452153 )
------------------------------------------------------------
# Chi-Squared = 43.35 using 59 PHA bins.
# Reduced chi-squared = 0.7882 for 55 degrees of freedom
# Null hypothesis probability = 8.719016e-01
Photon flux (15-150 keV) in 103.3 sec: 2.78966 ( -0.0684 0.06883 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1805e-05 ( -4.36752e-07 4.34996e-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 -0.096 sec. to 0.904 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25695 ( -0.0347157 0.0347993 )
Norm@50keV : 0.588959 ( -0.0130679 0.0130591 )
------------------------------------------------------------
# Chi-Squared = 74.70 using 59 PHA bins.
# Reduced chi-squared = 1.310 for 57 degrees of freedom
# Null hypothesis probability = 5.789637e-02
Photon flux (15-150 keV) in 1 sec: 69.7372 ( -1.52564 1.52572 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.88356e-06 ( -1.49554e-07 1.49743e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.096 sec. to 0.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.915138 ( -0.13937 0.13519 )
Epeak [keV] : 165.999 ( -33.3869 71.8538 )
Norm@50keV : 0.874007 ( -0.123144 0.147981 )
------------------------------------------------------------
# Chi-Squared = 55.15 using 59 PHA bins.
# Reduced chi-squared = 0.9849 for 56 degrees of freedom
# Null hypothesis probability = 5.068857e-01
Photon flux (15-150 keV) in 1 sec: 69.4588 ( -1.5313 1.5312 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.80456e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.096 sec. to 0.904 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.748449 ( -0.263592 0.891253 )
beta : -1.48076 ( 1.48076 0.134708 )
Epeak [keV] : 113.345 ( -65.0753 96.3697 )
Norm@50keV : 1.10600 ( -0.321369 2.98239 )
------------------------------------------------------------
# Chi-Squared = 53.85 using 59 PHA bins.
# Reduced chi-squared = 0.9792 for 55 degrees of freedom
# Null hypothesis probability = 5.184874e-01
Photon flux (15-150 keV) in 1 sec: 69.3535 ( -1.5335 1.534 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.80041e-06 ( -1.55616e-07 1.55203e-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
Plot creation:
Fri May 27 11:40:25 EDT 2011