batgrbproduct Analysis for Trigger=445321
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): Sat Feb 12 08:25:13 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger445321/GCN5_download_cron
======================================================================
Trigger: 00445321 Segment: 000
BAT Trigger Time: 319165755.392 [s; MET]
Trigger Stop: 319165756.416 [s; MET]
UTC: 2011-02-12T01:09:08.736900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 69.05298334334 Dec: 43.7024727760153 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.65
Image Trigger?: NO
Rate S/N Ratio: 21.51743479135 [ if not an image trigger ]
Image S/N Ratio: 10.65
Flight Position: [ source = BAT ]
RA: 69.05298334334 Dec: 43.7024727760153 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 69.0248503948904 Dec: 43.7156002404233 [deg; J2000]
{ 04h 36m 06.0s , +43d 42' 56.2" }
+/- 1.42599665487396 [arcmin] (estimated 90% radius based on SNR)
+/- 0.588361136747381 [arcmin] (formal 1-sigma fit error)
SNR: 18.3209962001435
Angular difference between Flight and Ground position is 1.452308 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 3.25999999046326 +/- 0.501058880921729
Measured from: -0.903999924659729
to: 2.35600006580353 [s; relative to TRIGTIME]
T50: 1.87199997901917 +/- 0.449177050692834
Measured from: -0.0119999051094055
to: 1.86000007390976 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.255999982357025
to: 1.25599998235703 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.75600004196167
to: 2.58799999952316 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.157466 0.197646 0.092141 0.023115
0.013222 0.013939 0.012051 0.009570 [error]
Peak 0.049012 0.077022 0.033401 0.005724
0.006571 0.006994 0.005997 0.004754 [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 5.49e-08 7.78e-08 8.17e-08 1.58e-07 2.64e-07 3.73e-07 erg/cm2
Error 6.78e-09 6.71e-09 1.14e-08 4.35e-08 2.68e-08 5.59e-08 erg/cm2
Peak flux Power-law 6.01e-01 4.95e-01 2.76e-01 2.27e-01 1.47e+00 1.60e+00 ph/cm2/s
Error 1.05e-01 5.88e-02 4.89e-02 7.66e-02 1.76e-01 1.91e-01 ph/cm2/s
Fluence Cutoff-PL 4.95e-08 8.87e-08 7.78e-08 3.08e-08 2.38e-07 2.47e-07 erg/cm2
Error 7.83e-09 9.90e-09 1.44e-08 3.65e-08 3.00e-08 4.71e-08 erg/cm2
Peak flux Cutoff-PL 5.02e-01 5.79e-01 2.79e-01 1.41e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 1.30e-01 8.74e-02 6.06e-02 1.94e-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 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 1.928 0.154 - - 6.61e-03 6.82e-04 61.440 57
CPL 0.784 0.849 44.6 10.2 2.99e-02 4.66e-02 54.290 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 1.842 0.205 - - 1.05e-02 1.44e-03 68.880 57
CPL 0.336 1.319 48.2 14.5 7.26e-02 2.53e-01 63.360 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: 2.752000 sec.
T50 in the 50-300 keV band: 1.728000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 4.344 -1.756 2.588
T90 3.260 -0.904 2.356
T50 1.872 -0.012 1.860
Peak 1.000 0.256 1.256
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
69.0249 +43.7156 0.0105 33.4 -155.2 0.4863 18.3 TRIG_00445321
------------------------------------------
Foreground time interval of the image:
-1.756 2.588 (delta_t = 4.344 [sec])
Background time interval of the image:
-239.392 -1.756 (delta_t = 237.636 [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 -1.756 sec. to 2.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92811 ( -0.150734 0.156784 )
Norm@50keV : 6.60975E-03 ( -0.000686934 0.000676651 )
------------------------------------------------------------
# Chi-Squared = 61.44 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.201720e-01
Photon flux (15-150 keV) in 4.344 sec: 0.960100 ( -0.0833787 0.0834127 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.6409e-07 ( -2.65763e-08 2.69434e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.756 sec. to 2.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.783806 ( -0.936375 0.761516 )
Epeak [keV] : 44.5707 ( -7.37108 12.9434 )
Norm@50keV : 2.99490E-02 ( -0.0188379 0.074271 )
------------------------------------------------------------
# Chi-Squared = 54.29 using 59 PHA bins.
# Reduced chi-squared = 0.9694 for 56 degrees of freedom
# Null hypothesis probability = 5.400046e-01
Photon flux (15-150 keV) in 4.344 sec: 0.922418 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38374e-07 ( -2.90388e-08 3.08793e-08 ) ergs/cm2
Band function
Time interval is from -1.756 sec. to 2.588 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.449787 ( -0.963943 1.94787 )
beta : -2.69412 ( 2.69412 0.593526 )
Epeak [keV] : 41.4646 ( -10.3758 12.0994 )
Norm@50keV : 4.92416E-02 ( -0.0343355 1.09343 )
------------------------------------------------------------
# Chi-Squared = 53.30 using 59 PHA bins.
# Reduced chi-squared = 0.9691 for 55 degrees of freedom
# Null hypothesis probability = 5.398965e-01
Photon flux (15-150 keV) in 4.344 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 0.256 sec. to 1.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84182 ( -0.199744 0.210425 )
Norm@50keV : 1.05123E-02 ( -0.00145249 0.00142423 )
------------------------------------------------------------
# Chi-Squared = 68.88 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 57 degrees of freedom
# Null hypothesis probability = 1.345314e-01
Photon flux (15-150 keV) in 1 sec: 1.47273 ( -0.175586 0.175672 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.66711e-08 ( -1.3266e-08 1.34783e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.256 sec. to 1.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.335726 ( -1.50737 1.12971 )
Epeak [keV] : 48.1976 ( -8.19281 20.8819 )
Norm@50keV : 7.25741E-02 ( -0.0730974 0.432992 )
------------------------------------------------------------
# Chi-Squared = 63.36 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 56 degrees of freedom
# Null hypothesis probability = 2.327938e-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 0.256 sec. to 1.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.277030 ( -1.21306 2.53053 )
beta : -2.97171 ( 2.90006 0.882637 )
Epeak [keV] : 47.0238 ( -10.5499 24.6273 )
Norm@50keV : 7.99447E-02 ( -0.101426 3.00332 )
------------------------------------------------------------
# Chi-Squared = 63.00 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 55 degrees of freedom
# Null hypothesis probability = 2.143920e-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:
Sat Feb 12 16:20:20 EST 2011