batgrbproduct Analysis for Trigger=449549
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 06:57:40 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger449549/GCN5_download_cron
======================================================================
Trigger: 00449549 Segment: 000
BAT Trigger Time: 322154836.48 [s; MET]
Trigger Stop: 322154837.504 [s; MET]
UTC: 2011-03-18T15:27:09.712860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 211.695156717948 Dec: -51.5589590244306 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.14
Image Trigger?: NO
Rate S/N Ratio: 11.4017542509914 [ if not an image trigger ]
Image S/N Ratio: 7.14
Flight Position: [ source = BAT ]
RA: 211.695156717948 Dec: -51.5589590244306 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 211.692423210856 Dec: -51.5672692171533 [deg; J2000]
{ 14h 06m 46.2s , -51d 34' 02.2" }
+/- 1.64080718186343 [arcmin] (estimated 90% radius based on SNR)
+/- 0.704743607992888 [arcmin] (formal 1-sigma fit error)
SNR: 14.9931646745208
Angular difference between Flight and Ground position is 0.508929 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 4.78799992799759 +/- 0.56483621211635
Measured from: -1.43999987840652
to: 3.34800004959106 [s; relative to TRIGTIME]
T50: 2.71199995279312 +/- 0.69447244954923
Measured from: -0.339999914169312
to: 2.37200003862381 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.755999982357025
to: 1.75599998235703 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.69200003147125
to: 3.68799996376038 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.057005 0.177071 0.124650 0.040530
0.014680 0.014157 0.012683 0.011580 [error]
Peak 0.027036 0.033883 0.025468 0.010638
0.006545 0.006227 0.005515 0.005105 [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 2.39e-08 5.63e-08 1.06e-07 4.79e-07 2.87e-07 6.65e-07 erg/cm2
Error 4.69e-09 6.65e-09 1.19e-08 1.22e-07 3.10e-08 1.29e-07 erg/cm2
Peak flux Power-law 2.08e-01 2.32e-01 1.86e-01 2.46e-01 7.17e-01 8.71e-01 ph/cm2/s
Error 7.67e-02 5.17e-02 4.55e-02 1.31e-01 1.45e-01 1.81e-01 ph/cm2/s
Fluence Cutoff-PL 2.00e-08 6.11e-08 1.12e-07 1.46e-07 2.65e-07 3.39e-07 erg/cm2
Error 5.48e-09 8.21e-09 1.38e-08 3.67e-08 1.55e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.08e-01 2.32e-01 1.86e-01 2.44e-01 7.16e-01 8.70e-01 ph/cm2/s
Error 7.67e-02 5.17e-02 4.55e-02 1.81e-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 1.093 0.172 - - 5.08e-03 5.06e-04 59.040 57
CPL 0.169 0.846 103.1 116.0 1.42e-02 1.69e-02 54.480 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 1.325 0.364 - - 5.98e-03 1.19e-03 37.290 57
CPL 1.323 0.367 9999.4 0.0 6.00e-03 1.73e-02 37.290 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: 4.544000 sec.
T50 in the 50-300 keV band: 2.496000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 5.380 -1.692 3.688
T90 4.788 -1.440 3.348
T50 2.712 -0.340 2.372
Peak 1.000 0.756 1.756
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
211.6924 -51.5673 0.0128 17.8 -61.2 0.4207 15.0 TRIG_00449549
------------------------------------------
Foreground time interval of the image:
-1.692 3.688 (delta_t = 5.380 [sec])
Background time interval of the image:
-239.480 -55.770 (delta_t = 183.710 [sec])
-54.480 -47.920 (delta_t = 6.560 [sec])
-46.480 -1.692 (delta_t = 44.788 [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 -1.692 sec. to 3.688 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09254 ( -0.17414 0.168968 )
Norm@50keV : 5.08260E-03 ( -0.000506548 0.000505744 )
------------------------------------------------------------
# Chi-Squared = 59.04 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 57 degrees of freedom
# Null hypothesis probability = 4.007004e-01
Photon flux (15-150 keV) in 5.38 sec: 0.589137 ( -0.0603551 0.0605429 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.86569e-07 ( -3.08337e-08 3.10953e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.692 sec. to 3.688 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.168889 ( -0.939749 0.751924 )
Epeak [keV] : 103.149 ( -29.5097 202.445 )
Norm@50keV : 1.42254E-02 ( -0.00795859 0.0257808 )
------------------------------------------------------------
# Chi-Squared = 54.48 using 59 PHA bins.
# Reduced chi-squared = 0.9729 for 56 degrees of freedom
# Null hypothesis probability = 5.325513e-01
Photon flux (15-150 keV) in 5.38 sec: 0.564287 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.65097e-07 ( -3.69789e-08 3.63365e-08 ) ergs/cm2
Band function
Time interval is from -1.692 sec. to 3.688 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96345 ( -64.2357 -54.2406 )
beta : -1.48781 ( -0.345056 0.279211 )
Epeak [keV] : 39.2718 ( -7.19966 6.98358 )
Norm@50keV : 28.7009 ( -28.7153 25.0064 )
------------------------------------------------------------
# Chi-Squared = 47.22 using 59 PHA bins.
# Reduced chi-squared = 0.8585 for 55 degrees of freedom
# Null hypothesis probability = 7.629866e-01
Photon flux (15-150 keV) in 5.38 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 0.756 sec. to 1.756 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32472 ( -0.36978 0.35905 )
Norm@50keV : 5.97773E-03 ( -0.00119504 0.00118807 )
------------------------------------------------------------
# Chi-Squared = 37.29 using 59 PHA bins.
# Reduced chi-squared = 0.6542 for 57 degrees of freedom
# Null hypothesis probability = 9.798849e-01
Photon flux (15-150 keV) in 1 sec: 0.716508 ( -0.144314 0.144916 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.8723e-08 ( -1.30902e-08 1.34327e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.756 sec. to 1.756 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32336 ( -0.37363 0.359832 )
Epeak [keV] : 9999.36 ( -9995.5 -9995.5 )
Norm@50keV : 5.99824E-03 ( -0.00119745 0.0333252 )
------------------------------------------------------------
# Chi-Squared = 37.29 using 59 PHA bins.
# Reduced chi-squared = 0.6659 for 56 degrees of freedom
# Null hypothesis probability = 9.744267e-01
Photon flux (15-150 keV) in 1 sec: 0.716273 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.84948e-08 ( -1.54406e-08 1.37669e-08 ) ergs/cm2
Band function
Time interval is from 0.756 sec. to 1.756 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99914 ( -2214.5 -2214.5 )
beta : -1.49833 ( -0.544504 0.426357 )
Epeak [keV] : 27.9356 ( -27.8917 8.88206 )
Norm@50keV : 292.739 ( -296.938 1.81301e+06 )
------------------------------------------------------------
# Chi-Squared = 35.58 using 59 PHA bins.
# Reduced chi-squared = 0.6468 for 55 degrees of freedom
# Null hypothesis probability = 9.805143e-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 07:23:56 EDT 2011