batgrbproduct Analysis for Trigger=441454
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): Mon Jan 3 07:30:23 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger441454/GCN5_download_cron
======================================================================
Trigger: 00441454 Segment: 000
BAT Trigger Time: 315687152 [s; MET]
Trigger Stop: 315687216 [s; MET]
UTC: 2011-01-02T18:52:25.474700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.879070553938 Dec: 7.619220658419 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.29
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.29
Flight Position: [ source = BAT ]
RA: 245.879070553938 Dec: 7.619220658419 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.877354103747 Dec: 7.61684283332373 [deg; J2000]
{ 16h 23m 30.6s , +07d 37' 00.6" }
+/- 1.83582381368117 [arcmin] (estimated 90% radius based on SNR)
+/- 0.782894481416701 [arcmin] (formal 1-sigma fit error)
SNR: 12.7707661583018
Angular difference between Flight and Ground position is 0.175427 arcmin
Partial Coding Fraction: 0.6640625 [ including projection effects ]
Duration
T90: 263.79599994421 +/- 5.09061884640017
Measured from: 7.22000014781952
to: 271.01600009203 [s; relative to TRIGTIME]
T50: 81.4519999623299 +/- 2.45809684796656
Measured from: 137.172000110149
to: 218.624000072479 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 208.759999990463
to: 209.759999990463 [s; relative to TRIGTIME]
Total Fluence
Measured from: -49.227999985218
to: 294.851999998093 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.311238 9.599403 7.394080 1.822703
0.130152 0.128926 0.113666 0.096078 [error]
Peak 0.226947 0.356457 0.339301 0.114520
0.009375 0.010829 0.010788 0.008122 [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 2.48e-06 4.29e-06 5.65e-06 1.51e-05 1.65e-05 2.76e-05 erg/cm2
Error 1.03e-07 1.02e-07 1.27e-07 8.10e-07 3.19e-07 8.53e-07 erg/cm2
Peak flux Power-law 2.38e+00 2.72e+00 2.23e+00 3.07e+00 8.45e+00 1.04e+01 ph/cm2/s
Error 1.65e-01 1.12e-01 8.83e-02 2.64e-01 3.05e-01 3.64e-01 ph/cm2/s
Fluence Cutoff-PL 2.41e-06 4.30e-06 5.71e-06 1.32e-05 1.64e-05 2.57e-05 erg/cm2
Error 1.43e-07 1.04e-07 1.45e-07 2.27e-06 3.43e-07 2.24e-06 erg/cm2
Peak flux Cutoff-PL 2.32e+00 2.73e+00 2.26e+00 2.79e+00 8.40e+00 1.01e+01 ph/cm2/s
Error 2.10e-01 1.14e-01 9.42e-02 6.37e-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 1.602 0.038 - - 5.14e-03 9.82e-05 46.000 57
CPL 1.493 0.140 267.4 0.0 5.73e-03 0.00e+00 44.450 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 1.284 0.062 - - 7.10e-02 2.42e-03 53.170 57
CPL 1.191 0.185 490.4 0.0 7.82e-02 1.74e-02 52.730 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: 196.608000 sec.
T50 in the 50-300 keV band: 74.112000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 344.080 -49.228 294.852
T90 263.796 7.220 271.016
T50 81.452 137.172 218.624
Peak 1.000 208.760 209.760
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.8774 +7.6168 0.0151 36.9 -14.9 1.8395 12.8 TRIG_00441454
------------------------------------------
Foreground time interval of the image:
-9.499 72.301 (delta_t = 81.800 [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
Time interval is from -49.228 sec. to 294.852 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60217 ( -0.0376374 0.0376337 )
Norm@50keV : 5.13518E-03 ( -9.82137e-05 9.81946e-05 )
------------------------------------------------------------
# Chi-Squared = 46.00 using 59 PHA bins.
# Reduced chi-squared = 0.8070 for 57 degrees of freedom
# Null hypothesis probability = 8.512765e-01
Photon flux (15-150 keV) in 344.1 sec: 0.660339 ( -0.015306 0.0153809 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6521e-05 ( -3.18484e-07 3.1856e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -49.228 sec. to 294.852 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49273 ( -0.153994 0.126872 )
Epeak [keV] : 267.375 ( )
Norm@50keV : 5.72805E-03 ( )
------------------------------------------------------------
# Chi-Squared = 44.45 using 59 PHA bins.
# Reduced chi-squared = 0.7938 for 56 degrees of freedom
# Null hypothesis probability = 8.670814e-01
Photon flux (15-150 keV) in 344.1 sec: 0.653223 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64136e-05 ( -3.33949e-07 3.5229e-07 ) ergs/cm2
Band function
Time interval is from -49.228 sec. to 294.852 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.42180 ( 1.19739 6.1909 )
beta : -1.65357 ( 1.6536 0.0763375 )
Epeak [keV] : 158.143 ( -158.214 -158.214 )
Norm@50keV : 6.27573E-03 ( -0.00119405 0.700232 )
------------------------------------------------------------
# Chi-Squared = 44.41 using 59 PHA bins.
# Reduced chi-squared = 0.8075 for 55 degrees of freedom
# Null hypothesis probability = 8.456785e-01
Photon flux (15-150 keV) in 344.1 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
Peak spectrum fit
Power-law model
Time interval is from 208.760 sec. to 209.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28440 ( -0.0622928 0.0622678 )
Norm@50keV : 7.09966E-02 ( -0.00242189 0.00242181 )
------------------------------------------------------------
# Chi-Squared = 53.17 using 59 PHA bins.
# Reduced chi-squared = 0.9328 for 57 degrees of freedom
# Null hypothesis probability = 6.194774e-01
Photon flux (15-150 keV) in 1 sec: 8.44621 ( -0.304759 0.305505 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.04284e-07 ( -2.61319e-08 2.61837e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 208.760 sec. to 209.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19095 ( -0.248373 0.122376 )
Epeak [keV] : 490.406 ( -490.445 -490.445 )
Norm@50keV : 7.82480E-02 ( -0.0123611 0.0223624 )
------------------------------------------------------------
# Chi-Squared = 52.73 using 59 PHA bins.
# Reduced chi-squared = 0.9416 for 56 degrees of freedom
# Null hypothesis probability = 5.995074e-01
Photon flux (15-150 keV) in 1 sec: 8.40231 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.00996e-07 ( -2.8693e-08 2.7396e-08 ) ergs/cm2
Band function
Time interval is from 208.760 sec. to 209.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11763 ( 0.864115 0.864115 )
beta : -1.32959 ( 1.36938 0.141267 )
Epeak [keV] : 247.159 ( -239.492 -239.492 )
Norm@50keV : 8.64076E-02 ( -0.0177345 5978.54 )
------------------------------------------------------------
# Chi-Squared = 52.62 using 59 PHA bins.
# Reduced chi-squared = 0.9567 for 55 degrees of freedom
# Null hypothesis probability = 5.661591e-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:
Mon Jan 3 07:53:55 EST 2011