batgrbproduct Analysis for Trigger=449578
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 Mar 19 07:33:08 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger449578/GCN5_download_cron
======================================================================
Trigger: 00449578 Segment: 000
BAT Trigger Time: 322193808.384 [s; MET]
Trigger Stop: 322193809.408 [s; MET]
UTC: 2011-03-19T02:16:41.615380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 356.401203320955 Dec: -66.0171233760089 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.06
Image Trigger?: NO
Rate S/N Ratio: 12.1655250605964 [ if not an image trigger ]
Image S/N Ratio: 7.06
Flight Position: [ source = BAT ]
RA: 356.401203320955 Dec: -66.0171233760089 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 356.509838447043 Dec: -66.0079652397634 [deg; J2000]
{ 23h 46m 02.4s , -66d 00' 28.7" }
+/- 0.81426670039446 [arcmin] (estimated 90% radius based on SNR)
+/- 0.233164967706236 [arcmin] (formal 1-sigma fit error)
SNR: 40.7938372713958
Angular difference between Flight and Ground position is 2.706222 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 19.2599999308586 +/- 1.61819281108566
Measured from: 2.00400012731552
to: 21.2640000581741 [s; relative to TRIGTIME]
T50: 10.3519999980927 +/- 0.390363944525864
Measured from: 5.31200009584427
to: 15.6640000939369 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 13.1039999723434
to: 14.1039999723434 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.251999974250793
to: 31.3199999928474 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.682482 1.426578 0.416111 0.024434
0.031932 0.031743 0.026733 0.023020 [error]
Peak 0.127470 0.096627 0.029749 0.005520
0.006636 0.006366 0.004987 0.004101 [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 5.51e-07 5.37e-07 3.66e-07 3.92e-07 1.61e-06 1.85e-06 erg/cm2
Error 3.01e-08 1.83e-08 2.42e-08 5.21e-08 5.67e-08 7.97e-08 erg/cm2
Peak flux Power-law 1.26e+00 6.70e-01 2.21e-01 9.44e-02 2.21e+00 2.25e+00 ph/cm2/s
Error 1.30e-01 5.47e-02 3.68e-02 2.86e-02 1.69e-01 1.71e-01 ph/cm2/s
Fluence Cutoff-PL 4.77e-07 5.85e-07 3.17e-07 6.81e-08 1.43e-06 1.45e-06 erg/cm2
Error 3.72e-08 2.36e-08 3.23e-08 3.60e-08 7.17e-08 8.19e-08 erg/cm2
Peak flux Cutoff-PL 1.20e+00 7.28e-01 1.86e-01 2.13e-02 2.14e+00 2.14e+00 ph/cm2/s
Error 1.43e-01 7.51e-02 5.44e-02 1.83e-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 2.554 0.078 - - 5.03e-03 2.34e-04 86.450 57
CPL 1.313 0.432 21.9 7.0 2.62e-02 1.64e-02 54.240 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 2.598 0.172 - - 1.06e-02 1.32e-03 56.670 57
CPL 1.657 0.845 12.6 0.0 4.25e-02 0.00e+00 52.880 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: 15.232000 sec.
T50 in the 50-300 keV band: 9.152000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 31.572 -0.252 31.320
T90 19.260 2.004 21.264
T50 10.352 5.312 15.664
Peak 1.000 13.104 14.104
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
356.5098 -66.0080 0.0047 9.1 -122.2 1.4873 40.8 TRIG_00449578
------------------------------------------
Foreground time interval of the image:
-0.252 10.017 (delta_t = 10.269 [sec])
Background time interval of the image:
-236.783 -0.252 (delta_t = 236.531 [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 -0.252 sec. to 31.320 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.55363 ( -0.0768786 0.0783278 )
Norm@50keV : 5.03046E-03 ( -0.000234489 0.000232781 )
------------------------------------------------------------
# Chi-Squared = 86.45 using 59 PHA bins.
# Reduced chi-squared = 1.517 for 57 degrees of freedom
# Null hypothesis probability = 7.148640e-03
Photon flux (15-150 keV) in 31.57 sec: 1.02160 ( -0.0386866 0.0389225 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61208e-06 ( -5.66461e-08 5.67998e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.252 sec. to 31.320 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31296 ( -0.452721 0.411056 )
Epeak [keV] : 21.8952 ( -8.93035 5.04928 )
Norm@50keV : 2.61696E-02 ( -0.0109638 0.0218249 )
------------------------------------------------------------
# Chi-Squared = 54.24 using 59 PHA bins.
# Reduced chi-squared = 0.9685 for 56 degrees of freedom
# Null hypothesis probability = 5.419414e-01
Photon flux (15-150 keV) in 31.57 sec: 0.935446 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43481e-06 ( -7.04642e-08 7.28572e-08 ) ergs/cm2
Band function
Time interval is from -0.252 sec. to 31.320 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31257 ( -0.411232 0.128158 )
beta : -9.37167 ( 10 20 )
Epeak [keV] : 21.9197 ( -2.11826 4.77151 )
Norm@50keV : 2.61486E-02 ( -0.0105728 0.0585806 )
------------------------------------------------------------
# Chi-Squared = 54.24 using 59 PHA bins.
# Reduced chi-squared = 0.9861 for 55 degrees of freedom
# Null hypothesis probability = 5.038192e-01
Photon flux (15-150 keV) in 31.57 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 13.104 sec. to 14.104 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.59843 ( -0.166875 0.176581 )
Norm@50keV : 1.05671E-02 ( -0.00132353 0.00131717 )
------------------------------------------------------------
# Chi-Squared = 56.67 using 59 PHA bins.
# Reduced chi-squared = 0.9942 for 57 degrees of freedom
# Null hypothesis probability = 4.873907e-01
Photon flux (15-150 keV) in 1 sec: 2.20765 ( -0.169374 0.169477 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08717e-07 ( -9.59411e-09 9.7759e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.104 sec. to 14.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65720 ( -1.1083 0.580868 )
Epeak [keV] : 12.5595 ( )
Norm@50keV : 4.24674E-02 ( )
------------------------------------------------------------
# Chi-Squared = 52.88 using 59 PHA bins.
# Reduced chi-squared = 0.9442 for 56 degrees of freedom
# Null hypothesis probability = 5.938023e-01
Photon flux (15-150 keV) in 1 sec: 2.13518 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.91564e-08 ( -1.09532e-08 1.23236e-08 ) ergs/cm2
Band function
Time interval is from 13.104 sec. to 14.104 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.618020 ( -2.7848 0.182761 )
beta : -2.97258 ( -0.783424 0.34353 )
Epeak [keV] : 22.0377 ( -7.11497 4.31999 )
Norm@50keV : 2.18675 ( -2.09811 2259.39 )
------------------------------------------------------------
# Chi-Squared = 50.29 using 59 PHA bins.
# Reduced chi-squared = 0.9143 for 55 degrees of freedom
# Null hypothesis probability = 6.549761e-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 Mar 19 08:08:25 EDT 2011