batgrbproduct Analysis for Trigger=450158
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): Tue Mar 29 01:05:08 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger450158/GCN5_download_cron
======================================================================
Trigger: 00450158 Segment: 000
BAT Trigger Time: 323009872 [s; MET]
Trigger Stop: 323011080 [s; MET]
UTC: 2011-03-28T12:57:45.200600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 251.233459410357 Dec: 57.5902460840076 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.6
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.6
Flight Position: [ source = BAT ]
RA: 251.233459410357 Dec: 57.5902460840076 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 251.270799708315 Dec: 57.6114086794127 [deg; J2000]
{ 16h 45m 05.0s , +57d 36' 41.1" }
+/- 3.53296136814303 [arcmin] (estimated 90% radius based on SNR)
+/- 2.24385600250737 [arcmin] (formal 1-sigma fit error)
SNR: 5.01259740418875
Angular difference between Flight and Ground position is 1.747386 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 1208 +/-
Measured from: 0
to: 1208 [s; relative to TRIGTIME]
T50: 1208 +/-
Measured from: 0
to: 1208 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1208 second)
Measured from: 0
to: 1208 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1208 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.889502 1.050149 0.496353 0.079871
0.191919 0.200608 0.187019 0.187088 [error]
Peak 0.889502 1.050149 0.496353 0.079871
0.191919 0.200608 0.187019 0.187088 [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 2.85e-07 4.30e-07 4.87e-07 1.05e-06 1.52e-06 2.25e-06 erg/cm2
Error 9.19e-08 9.84e-08 1.77e-07 7.75e-07 4.18e-07 9.63e-07 erg/cm2
Peak flux Power-law 1.41e-02 1.17e-02 6.63e-03 5.55e-03 3.49e-02 3.80e-02 ph/cm2/s
Error 4.63e-03 2.68e-03 2.33e-03 3.80e-03 7.97e-03 8.87e-03 ph/cm2/s
Fluence Cutoff-PL 2.69e-07 4.91e-07 4.34e-07 1.69e-07 1.32e-06 1.36e-06 erg/cm2
Error 1.00e-07 1.17e-07 3.29e-07 8.99e-07 4.98e-07 1.13e-06 erg/cm2
Peak flux Cutoff-PL 1.31e-02 1.33e-02 6.12e-03 1.23e-03 3.36e-02 3.38e-02 ph/cm2/s
Error 5.09e-03 4.13e-03 4.50e-03 7.15e-03 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 1.822 0.410 - - 2.51e-04 6.82e-05 53.210 57
CPL 1.002 2.627 48.5 0.0 7.78e-04 0.00e+00 52.400 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 1.822 0.410 - - 2.51e-04 6.82e-05 53.210 57
CPL 1.002 2.627 48.5 0.0 7.78e-04 0.00e+00 52.400 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 1208.000 0.000 1208.000
T90 1208.000 0.000 1208.000
T50 1208.000 0.000 1208.000
Peak 1208.000 0.000 1208.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.2708 +57.6114 0.0384 39.8 -23.4 2.7272 5.0 TRIG_00450158
------------------------------------------
Foreground time interval of the image:
93.000 123.060 (delta_t = 30.060 [sec])
134.000 303.060 (delta_t = 169.060 [sec])
483.000 483.071 (delta_t = 0.071 [sec])
502.000 585.380 (delta_t = 83.380 [sec])
589.000 963.057 (delta_t = 374.056 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
93.000000 123.059800
134.000000 303.060000
483.000000 483.070600
502.000000 585.380000
589.000000 963.056500
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82191 ( -0.394467 0.425092 )
Norm@50keV : 2.50805E-04 ( -6.94028e-05 6.70456e-05 )
------------------------------------------------------------
# Chi-Squared = 53.21 using 59 PHA bins.
# Reduced chi-squared = 0.9336 for 57 degrees of freedom
# Null hypothesis probability = 6.178694e-01
Photon flux (15-150 keV) in 656.6 sec: 3.48588E-02 ( -0.00796841 0.00797061 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51504e-06 ( -4.08179e-07 4.28405e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
93.000000 123.059800
134.000000 303.060000
483.000000 483.070600
502.000000 585.380000
589.000000 963.056500
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00164 ( -4.10578 1.14828 )
Epeak [keV] : 48.4684 ( )
Norm@50keV : 7.77562E-04 ( )
------------------------------------------------------------
# Chi-Squared = 52.40 using 59 PHA bins.
# Reduced chi-squared = 0.9356 for 56 degrees of freedom
# Null hypothesis probability = 6.120704e-01
Photon flux (15-150 keV) in 656.6 sec: 3.35598E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31795e-06 ( -4.52351e-07 5.44118e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
93.000000 123.059800
134.000000 303.060000
483.000000 483.070600
502.000000 585.380000
589.000000 963.056500
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96790 ( -61.4977 -61.4977 )
beta : -2.20455 ( -1.20768 0.595655 )
Epeak [keV] : 26.7223 ( -17.6577 8.32798 )
Norm@50keV : 24.0008 ( -20.4193 9.35813 )
------------------------------------------------------------
# Chi-Squared = 50.55 using 59 PHA bins.
# Reduced chi-squared = 0.9191 for 55 degrees of freedom
# Null hypothesis probability = 6.450296e-01
Photon flux (15-150 keV) in 656.6 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 589.000 sec. to 963.057 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82191 ( -0.394467 0.425092 )
Norm@50keV : 2.50805E-04 ( -6.94028e-05 6.70456e-05 )
------------------------------------------------------------
# Chi-Squared = 53.21 using 59 PHA bins.
# Reduced chi-squared = 0.9336 for 57 degrees of freedom
# Null hypothesis probability = 6.178694e-01
Photon flux (15-150 keV) in 656.6 sec: 3.48588E-02 ( -0.00796841 0.00797061 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51504e-06 ( -4.08179e-07 4.28405e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 589.000 sec. to 963.057 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00164 ( -4.10578 1.14828 )
Epeak [keV] : 48.4684 ( )
Norm@50keV : 7.77562E-04 ( )
------------------------------------------------------------
# Chi-Squared = 52.40 using 59 PHA bins.
# Reduced chi-squared = 0.9356 for 56 degrees of freedom
# Null hypothesis probability = 6.120704e-01
Photon flux (15-150 keV) in 656.6 sec: 3.35598E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31795e-06 ( -4.52351e-07 5.44118e-07 ) ergs/cm2
Band function
Time interval is from 589.000 sec. to 963.057 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96790 ( -61.4977 -61.4977 )
beta : -2.20455 ( -1.20768 0.595655 )
Epeak [keV] : 26.7223 ( -17.6577 8.32798 )
Norm@50keV : 24.0008 ( -20.4193 9.35813 )
------------------------------------------------------------
# Chi-Squared = 50.55 using 59 PHA bins.
# Reduced chi-squared = 0.9191 for 55 degrees of freedom
# Null hypothesis probability = 6.450296e-01
Photon flux (15-150 keV) in 656.6 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:
Tue Mar 29 01:21:54 EDT 2011