batgrbproduct Analysis for Trigger=449907
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): Thu Mar 24 14:14:38 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger449907/GCN5_download_cron
======================================================================
Trigger: 00449907 Segment: 000
BAT Trigger Time: 322624624 [s; MET]
Trigger Stop: 322624688 [s; MET]
UTC: 2011-03-24T01:56:57.215140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 268.635990311144 Dec: -26.3063949356629 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 12.78
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.78
Flight Position: [ source = BAT ]
RA: 268.635990311144 Dec: -26.3063949356629 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 268.564870123103 Dec: -26.3114826418825 [deg; J2000]
{ 17h 54m 15.6s , -26d 18' 41.3" }
+/- 2.7001773974738 [arcmin] (estimated 90% radius based on SNR)
+/- 1.19075730747069 [arcmin] (formal 1-sigma fit error)
SNR: 7.35942136370582
Angular difference between Flight and Ground position is 3.837363 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 613.887999951839 +/- 49.8256712605304
Measured from: -0.711999893188477
to: 613.176000058651 [s; relative to TRIGTIME]
T50: 301.807999968529 +/- 42.2064034815184
Measured from: 105.51600009203
to: 407.324000060558 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 44.0519999861717
to: 45.0519999861717 [s; relative to TRIGTIME]
Total Fluence
Measured from: -42.0080000162125
to: 664.508000016212 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.733343 1.811735 0.096202 0.020018
0.159462 0.145375 0.121807 0.104752 [error]
Peak 0.016869 0.012346 0.008877 0.013269
0.005964 0.005535 0.004646 0.003968 [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 2.13e-06 7.77e-07 1.63e-07 4.07e-08 3.09e-06 3.11e-06 erg/cm2
Error 1.82e-07 8.48e-08 4.27e-08 1.88e-08 2.13e-07 2.14e-07 erg/cm2
Peak flux Power-law 9.30e-02 1.02e-01 7.92e-02 1.01e-01 3.12e-01 3.75e-01 ph/cm2/s
Error 9.27e-02 5.31e-02 4.16e-02 1.71e-01 2.22e-01 1.57e-01 ph/cm2/s
Fluence Cutoff-PL 2.08e-06 7.44e-07 4.11e-08 1.69e-10 2.86e-06 2.86e-06 erg/cm2
Error 1.95e-07 1.03e-07 4.62e-08 2.49e-09 2.33e-07 2.33e-07 erg/cm2
Peak flux Cutoff-PL 9.30e-02 1.02e-01 7.92e-02 1.01e-01 3.12e-01 3.75e-01 ph/cm2/s
Error 9.27e-02 5.31e-02 4.16e-02 1.57e-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 4.252 0.242 - - 1.65e-04 3.31e-05 64.090 57
CPL 1.000 0.000 50.0 0.0 1.15e-03 0.00e+00 380.440 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 1.364 1.074 - - 2.58e-03 1.06e-03 44.770 57
CPL 1.364 1.180 9999.4 0.0 2.59e-03 4.62e-03 44.780 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 706.516 -42.008 664.508
T90 613.888 -0.712 613.176
T50 301.808 105.516 407.324
Peak 1.000 44.052 45.052
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
268.5649 -26.3115 0.0261 18.3 22.4 1.1940 7.4 TRIG_00449907
------------------------------------------
Foreground time interval of the image:
-42.008 71.101 (delta_t = 113.109 [sec])
Background time interval of the image:
-137.599 -42.008 (delta_t = 95.591 [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
Multiple GTIs in the spectrum
tstart tstop
-42.008000 113.135300
114.000000 664.508000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.25179 ( -0.235773 0.24746 )
Norm@50keV : 1.64676E-04 ( -3.14356e-05 3.48051e-05 )
------------------------------------------------------------
# Chi-Squared = 64.09 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 57 degrees of freedom
# Null hypothesis probability = 2.419396e-01
Photon flux (15-150 keV) in 705.7 sec: 0.126935 ( -0.00936333 0.00942001 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.09238e-06 ( -2.12757e-07 2.12797e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-42.008000 113.135300
114.000000 664.508000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.15332E-03 ( )
------------------------------------------------------------
# Chi-Squared = 380.44 using 59 PHA bins.
# Reduced chi-squared = 6.7935 for 56 degrees of freedom
# Null hypothesis probability = 9.077256e-50
Photon flux (15-150 keV) in 705.7 sec: 0.126842 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86248e-06 ( -2.307e-07 2.3492e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-42.008000 113.135300
114.000000 664.508000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41864 ( )
beta : -9.37167 ( )
Epeak [keV] : 35.9849 ( )
Norm@50keV : 9.46430E-04 ( )
------------------------------------------------------------
# Chi-Squared = 328.86 using 59 PHA bins.
# Reduced chi-squared = 5.9793 for 55 degrees of freedom
# Null hypothesis probability = 1.172262e-40
Photon flux (15-150 keV) in 705.7 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 44.052 sec. to 45.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36389 ( -1.16971 0.97781 )
Norm@50keV : 2.58407E-03 ( -0.00109494 0.00102051 )
------------------------------------------------------------
# Chi-Squared = 44.77 using 59 PHA bins.
# Reduced chi-squared = 0.7855 for 57 degrees of freedom
# Null hypothesis probability = 8.801335e-01
Photon flux (15-150 keV) in 1 sec: 0.311988 ( -0.311991 0.131343 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5179e-08 ( -1.1412e-08 1.17513e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 44.052 sec. to 45.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36396 ( -1.37958 0.980441 )
Epeak [keV] : 9999.36 ( -9988.12 -9988.12 )
Norm@50keV : 2.59249E-03 ( -0.00110531 0.00813844 )
------------------------------------------------------------
# Chi-Squared = 44.78 using 59 PHA bins.
# Reduced chi-squared = 0.7996 for 56 degrees of freedom
# Null hypothesis probability = 8.591747e-01
Photon flux (15-150 keV) in 1 sec: 0.311810 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51689e-08 ( -1.14156e-08 1.17597e-08 ) ergs/cm2
Band function
Time interval is from 44.052 sec. to 45.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05842 ( 1.05662 1.05662 )
beta : -1.35440 ( 1.35989 1.16762 )
Epeak [keV] : 44.2947 ( -47.3311 -47.3311 )
Norm@50keV : 5.06559E-03 ( -0.00508505 8.43193 )
------------------------------------------------------------
# Chi-Squared = 44.77 using 59 PHA bins.
# Reduced chi-squared = 0.8140 for 55 degrees of freedom
# Null hypothesis probability = 8.361195e-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:
Thu Mar 24 14:48:04 EDT 2011