batgrbproduct Analysis for Trigger=449074
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): Sun Mar 13 07:58:18 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger449074/GCN5_download_cron
======================================================================
Trigger: 00449074 Segment: 000
BAT Trigger Time: 321645344 [s; MET]
Trigger Stop: 321645408 [s; MET]
UTC: 2011-03-12T17:55:37.252080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 157.478927330622 Dec: -5.25539715048247 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.46
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.46
Flight Position: [ source = BAT ]
RA: 157.478927330622 Dec: -5.25539715048247 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 157.501941124383 Dec: -5.2488438661459 [deg; J2000]
{ 10h 30m 00.5s , -05d 14' 55.8" }
+/- 2.15292904706519 [arcmin] (estimated 90% radius based on SNR)
+/- 0.92886371065385 [arcmin] (formal 1-sigma fit error)
SNR: 10.1709528505949
Angular difference between Flight and Ground position is 1.430144 arcmin
Partial Coding Fraction: 0.265625 [ including projection effects ]
Duration
T90: 34.960000038147 +/- 7.10696333975949
Measured from: 26.9520001411438
to: 61.9120001792908 [s; relative to TRIGTIME]
T50: 14.7360000014305 +/- 5.21563802514024
Measured from: 35.9440001249313
to: 50.6800001263618 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 44.2039999961853
to: 45.2039999961853 [s; relative to TRIGTIME]
Total Fluence
Measured from: 24.727999985218
to: 64.7760000228882 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.742595 0.635736 0.229667 0.067666
0.067867 0.070576 0.065112 0.067150 [error]
Peak 0.059706 0.037211 0.039788 0.016012
0.011243 0.011072 0.009942 0.010626 [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 2.37e-07 2.66e-07 2.14e-07 2.86e-07 8.23e-07 1.00e-06 erg/cm2
Error 3.59e-08 3.53e-08 5.58e-08 1.41e-07 1.28e-07 2.16e-07 erg/cm2
Peak flux Power-law 4.91e-01 3.93e-01 2.12e-01 1.67e-01 1.17e+00 1.26e+00 ph/cm2/s
Error 1.81e-01 9.16e-02 8.52e-02 1.37e-01 2.74e-01 3.00e-01 ph/cm2/s
Fluence Cutoff-PL 2.31e-07 2.90e-07 1.83e-07 6.01e-08 7.47e-07 7.63e-07 erg/cm2
Error 3.82e-08 3.58e-08 7.53e-08 1.91e-07 1.46e-07 2.64e-07 erg/cm2
Peak flux Cutoff-PL 4.91e-01 3.93e-01 2.12e-01 1.66e-01 1.17e+00 1.26e+00 ph/cm2/s
Error 1.81e-01 9.17e-02 8.53e-02 2.99e-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 2.315 0.255 - - 2.14e-03 4.07e-04 46.640 57
CPL 1.506 0.954 21.6 14.4 7.05e-03 2.93e-02 45.010 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 1.890 0.503 - - 8.20e-03 2.45e-03 60.360 57
CPL 2.559 0.000 193.1 0.0 3.82e-03 0.00e+00 59.900 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 40.048 24.728 64.776
T90 34.960 26.952 61.912
T50 14.736 35.944 50.680
Peak 1.000 44.204 45.204
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
157.5019 -5.2488 0.0189 33.1 81.4 1.6326 10.2 TRIG_00449074
------------------------------------------
Foreground time interval of the image:
24.728 64.776 (delta_t = 40.048 [sec])
Background time interval of the image:
-133.799 24.728 (delta_t = 158.527 [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 24.728 sec. to 64.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.31512 ( -0.244147 0.266324 )
Norm@50keV : 2.14361E-03 ( -0.000409108 0.000404894 )
------------------------------------------------------------
# Chi-Squared = 46.64 using 59 PHA bins.
# Reduced chi-squared = 0.8183 for 57 degrees of freedom
# Null hypothesis probability = 8.346476e-01
Photon flux (15-150 keV) in 40.05 sec: 0.377797 ( -0.0450934 0.045101 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.22747e-07 ( -1.25085e-07 1.30667e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 24.728 sec. to 64.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50551 ( -1.40107 0.505966 )
Epeak [keV] : 21.5889 ( -15.7945 12.9504 )
Norm@50keV : 7.04808E-03 ( -0.00704808 0.0515419 )
------------------------------------------------------------
# Chi-Squared = 45.01 using 59 PHA bins.
# Reduced chi-squared = 0.8037 for 56 degrees of freedom
# Null hypothesis probability = 8.534529e-01
Photon flux (15-150 keV) in 40.05 sec: 0.368029 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.47353e-07 ( -1.32718e-07 1.60076e-07 ) ergs/cm2
Band function
Time interval is from 24.728 sec. to 64.776 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.23477 ( -4.35815 -4.35815 )
beta : -2.53306 ( -0.460695 0.348035 )
Epeak [keV] : 21.3716 ( -21.351 10.6321 )
Norm@50keV : 325.090 ( -326.791 4624.81 )
------------------------------------------------------------
# Chi-Squared = 44.00 using 59 PHA bins.
# Reduced chi-squared = 0.7999 for 55 degrees of freedom
# Null hypothesis probability = 8.563045e-01
Photon flux (15-150 keV) in 40.05 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 44.204 sec. to 45.204 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89026 ( -0.471869 0.533945 )
Norm@50keV : 8.19601E-03 ( -0.00255878 0.00233957 )
------------------------------------------------------------
# Chi-Squared = 60.36 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 57 degrees of freedom
# Null hypothesis probability = 3.554630e-01
Photon flux (15-150 keV) in 1 sec: 1.17139 ( -0.274266 0.274462 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.53466e-08 ( -2.15901e-08 2.25551e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 44.204 sec. to 45.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.55884 ( )
Epeak [keV] : 193.060 ( )
Norm@50keV : 3.81973E-03 ( )
------------------------------------------------------------
# Chi-Squared = 59.90 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 56 degrees of freedom
# Null hypothesis probability = 3.362704e-01
Photon flux (15-150 keV) in 1 sec: 1.17090 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.53378e-08 ( -2.15913e-08 2.25595e-08 ) ergs/cm2
Band function
Time interval is from 44.204 sec. to 45.204 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47415 ( 1.47787 1.47787 )
beta : -1.88446 ( 1.88751 0.468913 )
Epeak [keV] : 21.6094 ( -20.8324 -20.8324 )
Norm@50keV : 1.93298E-02 ( -0.0195393 1.47187 )
------------------------------------------------------------
# Chi-Squared = 60.36 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 55 degrees of freedom
# Null hypothesis probability = 2.883946e-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:
Sun Mar 13 08:27:45 EDT 2011