batgrbproduct Analysis for Trigger=441664
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): Fri Jan 7 01:19:58 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger441664/GCN5_download_cron
======================================================================
Trigger: 00441664 Segment: 000
BAT Trigger Time: 316020322.752 [s; MET]
Trigger Stop: 316020323.776 [s; MET]
UTC: 2011-01-06T15:25:16.214380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 79.2851643424613 Dec: 64.1838497908165 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.16
Image Trigger?: NO
Rate S/N Ratio: 11.5325625946708 [ if not an image trigger ]
Image S/N Ratio: 8.16
Flight Position: [ source = BAT ]
RA: 79.2851643424613 Dec: 64.1838497908165 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 79.2786947462438 Dec: 64.2037163752027 [deg; J2000]
{ 05h 17m 06.9s , +64d 12' 13.4" }
+/- 2.07597708198188 [arcmin] (estimated 90% radius based on SNR)
+/- 0.846935129125645 [arcmin] (formal 1-sigma fit error)
SNR: 10.7137942484195
Angular difference between Flight and Ground position is 1.203914 arcmin
Partial Coding Fraction: 0.34375 [ including projection effects ]
Duration
T90: 3.96799999475479 +/- 1.09363247030368
Measured from: -0.327999830245972
to: 3.64000016450882 [s; relative to TRIGTIME]
T50: 1.27999997138977 +/- 0.931854087573449
Measured from: 0.312000155448914
to: 1.59200012683868 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.356000006198883
to: 1.35600000619888 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.519999980926514
to: 4.02400004863739 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.141173 0.193522 0.093829 0.055360
0.024279 0.025383 0.022280 0.018805 [error]
Peak 0.049205 0.101183 0.046891 0.014106
0.012070 0.012793 0.011667 0.008870 [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 4.72e-08 7.82e-08 9.85e-08 2.47e-07 2.93e-07 4.71e-07 erg/cm2
Error 1.23e-08 1.26e-08 2.18e-08 1.17e-07 5.15e-08 1.35e-07 erg/cm2
Peak flux Power-law 6.73e-01 6.04e-01 3.74e-01 3.52e-01 1.80e+00 2.00e+00 ph/cm2/s
Error 1.83e-01 1.11e-01 8.94e-02 1.61e-01 3.29e-01 3.63e-01 ph/cm2/s
Fluence Cutoff-PL 4.71e-08 7.83e-08 9.85e-08 2.45e-07 2.93e-07 4.69e-07 erg/cm2
Error 1.23e-08 1.26e-08 2.18e-08 1.16e-07 5.15e-08 1.34e-07 erg/cm2
Peak flux Cutoff-PL 5.71e-01 7.30e-01 3.76e-01 6.79e-02 1.79e+00 1.74e+00 ph/cm2/s
Error 2.08e-01 1.76e-01 1.38e-01 3.57e-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 1.668 0.287 - - 6.94e-03 1.15e-03 65.040 57
CPL 1.679 0.478 9999.4 0.0 6.90e-03 0.00e+00 65.050 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 1.693 0.288 - - 1.36e-02 2.62e-03 62.470 57
CPL 0.070 2.168 51.0 67.2 1.13e-01 2.93e+00 59.210 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 4.544 -0.520 4.024
T90 3.968 -0.328 3.640
T50 1.280 0.312 1.592
Peak 1.000 0.356 1.356
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
79.2787 +64.2037 0.0179 44.2 173.6 0.5175 10.7 TRIG_00441664
------------------------------------------
Foreground time interval of the image:
-0.520 4.024 (delta_t = 4.544 [sec])
Background time interval of the image:
-239.752 -0.520 (delta_t = 239.232 [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 -0.520 sec. to 4.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66784 ( -0.282506 0.290734 )
Norm@50keV : 6.94243E-03 ( -0.00116346 0.00113966 )
------------------------------------------------------------
# Chi-Squared = 65.04 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 57 degrees of freedom
# Null hypothesis probability = 2.171888e-01
Photon flux (15-150 keV) in 4.544 sec: 0.911917 ( -0.146252 0.146753 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.92888e-07 ( -5.12072e-08 5.17789e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.520 sec. to 4.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67929 ( -0.67643 0.280531 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 6.90158E-03 ( )
------------------------------------------------------------
# Chi-Squared = 65.05 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 56 degrees of freedom
# Null hypothesis probability = 1.908254e-01
Photon flux (15-150 keV) in 4.544 sec: 0.911608 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.92893e-07 ( -5.12209e-08 5.17989e-08 ) ergs/cm2
Band function
Time interval is from -0.520 sec. to 4.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14095 ( 1.14096 1.14096 )
beta : -1.74878 ( 1.74888 0.357238 )
Epeak [keV] : 56.7335 ( -56.6747 189.847 )
Norm@50keV : 1.48755E-02 ( -0.0148855 43.1873 )
------------------------------------------------------------
# Chi-Squared = 64.91 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 55 degrees of freedom
# Null hypothesis probability = 1.694179e-01
Photon flux (15-150 keV) in 4.544 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 0.356 sec. to 1.356 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69318 ( -0.282969 0.293687 )
Norm@50keV : 1.35848E-02 ( -0.00263654 0.0025966 )
------------------------------------------------------------
# Chi-Squared = 62.47 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.881305e-01
Photon flux (15-150 keV) in 1 sec: 1.79993 ( -0.328288 0.328788 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25851e-07 ( -2.51414e-08 2.55462e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.356 sec. to 1.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.99308E-02 ( -2.79881 1.53753 )
Epeak [keV] : 51.0266 ( -12.6212 121.682 )
Norm@50keV : 0.113245 ( -0.113672 5.73786 )
------------------------------------------------------------
# Chi-Squared = 59.21 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 56 degrees of freedom
# Null hypothesis probability = 3.593492e-01
Photon flux (15-150 keV) in 1 sec: 1.78740 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14751e-07 ( -2.85492e-08 2.9612e-08 ) ergs/cm2
Band function
Time interval is from 0.356 sec. to 1.356 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97281 ( -82.2422 -72.2426 )
beta : -2.37824 ( -1.10162 0.544737 )
Epeak [keV] : 33.2322 ( -6.23353 6.73164 )
Norm@50keV : 324.642 ( -325.045 84.1791 )
------------------------------------------------------------
# Chi-Squared = 54.83 using 59 PHA bins.
# Reduced chi-squared = 0.9968 for 55 degrees of freedom
# Null hypothesis probability = 4.812707e-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:
Fri Jan 7 02:01:07 EST 2011