batgrbproduct Analysis for Trigger=450545
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 Apr 2 09:55:47 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger450545/GCN5_download_cron
======================================================================
Trigger: 00450545 Segment: 000
BAT Trigger Time: 323395984 [s; MET]
Trigger Stop: 323396056 [s; MET]
UTC: 2011-04-02T00:12:57.186040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 197.4192884111 Dec: 61.2417618407497 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.87
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.87
Flight Position: [ source = BAT ]
RA: 197.4192884111 Dec: 61.2417618407497 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 197.43215734958 Dec: 61.247137366357 [deg; J2000]
{ 13h 09m 43.7s , +61d 14' 49.7" }
+/- 1.70072516931859 [arcmin] (estimated 90% radius based on SNR)
+/- 0.552464873488352 [arcmin] (formal 1-sigma fit error)
SNR: 14.2442975998809
Angular difference between Flight and Ground position is 0.491940 arcmin
Partial Coding Fraction: 0.1074219 [ including projection effects ]
Duration
T90: 60.8960000276566 +/- 6.93581545664705
Measured from: 2.55200010538101
to: 63.4480001330376 [s; relative to TRIGTIME]
T50: 32.2880000472069 +/- 11.7788692003121
Measured from: 6.02400010824203
to: 38.3120001554489 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.18000000715256
to: 4.18000000715256 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.375999987125397
to: 69.7039999961853 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.302149 1.906221 1.374757 0.487331
0.156034 0.163667 0.145190 0.125432 [error]
Peak 0.074010 0.155779 0.178067 0.083555
0.022104 0.025389 0.024958 0.021134 [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 5.05e-07 8.78e-07 1.17e-06 3.16e-06 3.40e-06 5.71e-06 erg/cm2
Error 8.43e-08 8.93e-08 1.44e-07 8.42e-07 3.50e-07 9.48e-07 erg/cm2
Peak flux Power-law 8.74e-01 1.22e+00 1.26e+00 2.38e+00 4.11e+00 5.74e+00 ph/cm2/s
Error 3.00e-01 2.57e-01 1.91e-01 7.97e-01 6.65e-01 8.96e-01 ph/cm2/s
Fluence Cutoff-PL 4.92e-07 8.94e-07 1.18e-06 2.50e-06 3.37e-06 5.06e-06 erg/cm2
Error 9.83e-08 1.06e-07 1.47e-07 1.51e-06 3.75e-07 1.55e-06 erg/cm2
Peak flux Cutoff-PL 8.72e-01 1.22e+00 1.26e+00 2.37e+00 4.11e+00 5.72e+00 ph/cm2/s
Error 3.00e-01 2.57e-01 1.91e-01 8.93e-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 1.591 0.167 - - 5.19e-03 5.03e-04 56.200 57
CPL 1.351 0.530 138.3 0.0 6.82e-03 0.00e+00 56.070 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 0.953 0.271 - - 3.58e-02 5.68e-03 43.760 57
CPL 0.952 0.273 9999.4 0.0 3.60e-02 2.90e-02 43.770 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: 34.880000 sec.
T50 in the 50-300 keV band: 20.928000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 70.080 -0.376 69.704
T90 60.896 2.552 63.448
T50 32.288 6.024 38.312
Peak 1.000 3.180 4.180
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
197.4322 +61.2471 0.0135 48.1 28.1 5.2766 14.2 TRIG_00450545
------------------------------------------
Foreground time interval of the image:
-0.376 69.704 (delta_t = 70.080 [sec])
Background time interval of the image:
-239.000 -0.376 (delta_t = 238.624 [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 -0.376 sec. to 69.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59070 ( -0.166437 0.168119 )
Norm@50keV : 5.18616E-03 ( -0.000503871 0.000501291 )
------------------------------------------------------------
# Chi-Squared = 56.20 using 59 PHA bins.
# Reduced chi-squared = 0.9859 for 57 degrees of freedom
# Null hypothesis probability = 5.051400e-01
Photon flux (15-150 keV) in 70.08 sec: 0.664537 ( -0.0664833 0.0666953 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.4029e-06 ( -3.49557e-07 3.51296e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.376 sec. to 69.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35128 ( -0.66417 0.395415 )
Epeak [keV] : 138.292 ( )
Norm@50keV : 6.82385E-03 ( )
------------------------------------------------------------
# Chi-Squared = 56.07 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 56 degrees of freedom
# Null hypothesis probability = 4.722528e-01
Photon flux (15-150 keV) in 70.08 sec: 0.659888 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37231e-06 ( -3.78698e-07 3.71922e-07 ) ergs/cm2
Band function
Time interval is from -0.376 sec. to 69.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02320 ( 1.0232 1.0232 )
beta : -1.73554 ( 1.73554 0.289487 )
Epeak [keV] : 72.2613 ( -72.2614 -72.2614 )
Norm@50keV : 1.07505E-02 ( -0.0107505 119.745 )
------------------------------------------------------------
# Chi-Squared = 55.54 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 55 degrees of freedom
# Null hypothesis probability = 4.543238e-01
Photon flux (15-150 keV) in 70.08 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 3.180 sec. to 4.180 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.952998 ( -0.279665 0.262265 )
Norm@50keV : 3.57683E-02 ( -0.00574731 0.00561968 )
------------------------------------------------------------
# Chi-Squared = 43.76 using 59 PHA bins.
# Reduced chi-squared = 0.7677 for 57 degrees of freedom
# Null hypothesis probability = 9.010721e-01
Photon flux (15-150 keV) in 1 sec: 4.10954 ( -0.662002 0.667392 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.93431e-07 ( -6.00646e-08 6.01881e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.180 sec. to 4.180 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.952411 ( -0.286213 0.260444 )
Epeak [keV] : 9999.36 ( -9998.22 -9998.22 )
Norm@50keV : 3.60284E-02 ( -0.00538359 0.0527129 )
------------------------------------------------------------
# Chi-Squared = 43.77 using 59 PHA bins.
# Reduced chi-squared = 0.7815 for 56 degrees of freedom
# Null hypothesis probability = 8.827183e-01
Photon flux (15-150 keV) in 1 sec: 4.10859 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.93611e-07 ( -6.0104e-08 6.0233e-08 ) ergs/cm2
Band function
Time interval is from 3.180 sec. to 4.180 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.782498 ( 0.782498 0.782498 )
beta : -0.952999 ( 0.952999 0.279651 )
Epeak [keV] : 52.3028 ( -52.3028 -52.3028 )
Norm@50keV : 5.88541E-02 ( -0.0284474 15346 )
------------------------------------------------------------
# Chi-Squared = 43.76 using 59 PHA bins.
# Reduced chi-squared = 0.7957 for 55 degrees of freedom
# Null hypothesis probability = 8.621329e-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 Apr 2 10:22:45 EDT 2011