batgrbproduct Analysis for Trigger=445033
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): Wed Feb 9 07:19:37 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger445033/GCN5_download_cron
======================================================================
Trigger: 00445033 Segment: 000
BAT Trigger Time: 318885454.384 [s; MET]
Trigger Stop: 318885454.4 [s; MET]
UTC: 2011-02-08T19:17:27.739380 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 280.305974394139 Dec: -4.9519952841751 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.97
Image Trigger?: NO
Rate S/N Ratio: 25.8843582110896 [ if not an image trigger ]
Image S/N Ratio: 7.97
Flight Position: [ source = BAT ]
RA: 280.305974394139 Dec: -4.9519952841751 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.331938136863 Dec: -4.93884969086724 [deg; J2000]
{ 18h 41m 19.7s , -04d 56' 19.9" }
+/- 1.11261831025978 [arcmin] (estimated 90% radius based on SNR)
+/- 0.366112890286847 [arcmin] (formal 1-sigma fit error)
SNR: 26.1161719184645
Angular difference between Flight and Ground position is 1.740944 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 0.131999909877777 +/- 0.01442223432929
Measured from: 0.00400012731552124
to: 0.136000037193298 [s; relative to TRIGTIME]
T50: 0.0719999670982361 +/- 0.00565682356674367
Measured from: 0.0440000891685486
to: 0.116000056266785 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.430000007152557
to: 0.569999992847443 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00800001621246338
to: 0.143999993801117 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.054831 0.078593 0.029847 0.002259
0.003661 0.003932 0.002859 0.001589 [error]
Peak 0.049851 0.075690 0.035879 0.000557
0.006270 0.006234 0.005004 0.004056 [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 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 Power-law 5.36e-01 4.50e-01 2.57e-01 2.18e-01 1.34e+00 1.46e+00 ph/cm2/s
Error 8.29e-02 4.81e-02 3.94e-02 6.30e-02 1.43e-01 1.57e-01 ph/cm2/s
Fluence Cutoff-PL 1.51e-08 3.26e-08 2.37e-08 3.73e-09 7.48e-08 7.52e-08 erg/cm2
Error 1.98e-09 2.56e-09 3.27e-09 2.28e-09 5.78e-09 6.06e-09 erg/cm2
Peak flux Cutoff-PL 4.38e-01 5.47e-01 2.58e-01 1.28e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 9.63e-02 6.93e-02 5.12e-02 1.49e-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 4.43e-01 1.28e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 1.45e-01 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 2.090 0.000 - - 5.62e-02 0.00e+00 114.870 57
CPL -0.255 0.655 42.2 3.2 1.16e+00 1.18e+00 54.440 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 0.175 - - 9.70e-03 1.16e-03 59.850 57
CPL -0.013 1.047 47.6 8.3 1.02e-01 2.23e-01 46.100 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: 0.128000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.152 -0.008 0.144
T90 0.132 0.004 0.136
T50 0.072 0.044 0.116
Peak 1.000 -0.430 0.570
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.3319 -4.9388 0.0074 15.7 -34.6 0.1750 26.1 TRIG_00445033
------------------------------------------
Foreground time interval of the image:
-0.008 0.144 (delta_t = 0.152 [sec])
Background time interval of the image:
-239.384 -0.008 (delta_t = 239.376 [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 -0.008 sec. to 0.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08958 ( )
Norm@50keV : 5.62070E-02 ( )
------------------------------------------------------------
# Chi-Squared = 114.87 using 59 PHA bins.
# Reduced chi-squared = 2.0153 for 57 degrees of freedom
# Null hypothesis probability = 8.824564e-06
Photon flux (15-150 keV) in 0.152 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.255048 ( -0.701717 0.60905 )
Epeak [keV] : 42.1741 ( -3.08357 3.28257 )
Norm@50keV : 1.15902 ( -0.628668 1.7262 )
------------------------------------------------------------
# Chi-Squared = 54.44 using 59 PHA bins.
# Reduced chi-squared = 0.9722 for 56 degrees of freedom
# Null hypothesis probability = 5.339307e-01
Photon flux (15-150 keV) in 0.152 sec: 8.57703 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.4825e-08 ( -5.72797e-09 5.83072e-09 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 0.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.255443 ( -0.480975 0.855306 )
beta : -9.99998 ( 132621 132631 )
Epeak [keV] : 42.1426 ( -3.0616 3.3038 )
Norm@50keV : 1.16117 ( -0.630657 1.72168 )
------------------------------------------------------------
# Chi-Squared = 54.45 using 59 PHA bins.
# Reduced chi-squared = 0.9899 for 55 degrees of freedom
# Null hypothesis probability = 4.957792e-01
Photon flux (15-150 keV) in 0.152 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 -0.430 sec. to 0.570 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80718 ( -0.171981 0.177972 )
Norm@50keV : 9.69694E-03 ( -0.00117141 0.001157 )
------------------------------------------------------------
# Chi-Squared = 59.85 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 57 degrees of freedom
# Null hypothesis probability = 3.726156e-01
Photon flux (15-150 keV) in 1 sec: 1.33996 ( -0.143355 0.143437 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.92466e-08 ( -1.08607e-08 1.10261e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.430 sec. to 0.570 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.30443E-02 ( -1.17195 0.921215 )
Epeak [keV] : 47.6008 ( -6.47275 10.2029 )
Norm@50keV : 0.102492 ( -0.0709823 0.374991 )
------------------------------------------------------------
# Chi-Squared = 46.10 using 59 PHA bins.
# Reduced chi-squared = 0.8233 for 56 degrees of freedom
# Null hypothesis probability = 8.245402e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.430 sec. to 0.570 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.33446E-02 ( -0.785056 1.31222 )
beta : -10.00000 ( 3.21155e+06 3.21156e+06 )
Epeak [keV] : 47.5916 ( -6.47231 10.1999 )
Norm@50keV : 0.102545 ( -0.0710318 0.373394 )
------------------------------------------------------------
# Chi-Squared = 46.10 using 59 PHA bins.
# Reduced chi-squared = 0.8382 for 55 degrees of freedom
# Null hypothesis probability = 7.979959e-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:
Wed Feb 9 07:34:31 EST 2011