batgrbproduct Analysis for Trigger=443861
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 28 16:05:23 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger443861/GCN5_download_cron
======================================================================
Trigger: 00443861 Segment: 000
BAT Trigger Time: 317871879.616 [s; MET]
Trigger Stop: 317871887.808 [s; MET]
UTC: 2011-01-28T01:44:33.009360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 193.874023479601 Dec: 28.0796152509682 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.29
Image Trigger?: NO
Rate S/N Ratio: 10.0498756211209 [ if not an image trigger ]
Image S/N Ratio: 8.29
Flight Position: [ source = BAT ]
RA: 193.874023479601 Dec: 28.0796152509682 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 193.870759429914 Dec: 28.1081780349993 [deg; J2000]
{ 12h 55m 29.0s , +28d 06' 29.4" }
+/- 2.26049101816425 [arcmin] (estimated 90% radius based on SNR)
+/- 1.0852041213172 [arcmin] (formal 1-sigma fit error)
SNR: 9.48668325311933
Angular difference between Flight and Ground position is 1.722454 arcmin
Partial Coding Fraction: 0.375 [ including projection effects ]
Duration
T90: 30.6719999313354 +/- 18.0860812707372
Measured from: -0.327999889850616
to: 30.3440000414848 [s; relative to TRIGTIME]
T50: 12.5799999237061 +/- 7.92985877181667
Measured from: 4.4520001411438
to: 17.0320000648499 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.57599997520447
to: 4.57599997520447 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.36000001430511
to: 48.3199999928474 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.206370 0.379326 0.320016 0.162268
0.059822 0.062431 0.056737 0.052752 [error]
Peak 0.014063 0.032827 0.038091 0.009870
0.008751 0.009207 0.008624 0.007467 [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 7.79e-08 1.61e-07 2.59e-07 9.37e-07 7.18e-07 1.43e-06 erg/cm2
Error 2.53e-08 3.18e-08 5.37e-08 4.31e-07 1.35e-07 4.64e-07 erg/cm2
Peak flux Power-law 2.04e-01 2.40e-01 2.04e-01 2.94e-01 7.53e-01 9.43e-01 ph/cm2/s
Error 1.10e-01 8.26e-02 6.62e-02 1.96e-01 2.29e-01 2.82e-01 ph/cm2/s
Fluence Cutoff-PL 6.20e-08 1.75e-07 2.81e-07 2.78e-07 6.72e-07 7.96e-07 erg/cm2
Error 3.37e-08 4.02e-08 6.45e-08 6.22e-07 1.59e-07 6.31e-07 erg/cm2
Peak flux Cutoff-PL 1.51e-01 2.56e-01 2.33e-01 1.20e-01 7.20e-01 7.60e-01 ph/cm2/s
Error 1.28e-01 9.87e-02 8.45e-02 3.14e-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 8.13e-01 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 1.311 0.301 - - 1.47e-03 2.55e-04 61.790 57
CPL 0.265 2.001 88.4 0.0 4.59e-03 4.45e-02 60.410 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 1.236 0.483 - - 6.38e-03 1.87e-03 56.670 57
CPL 0.052 2.242 92.5 0.0 2.19e-02 0.00e+00 55.440 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: 8.064000 sec.
T50 in the 50-300 keV band: 3.840000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 49.680 -1.360 48.320
T90 30.672 -0.328 30.344
T50 12.580 4.452 17.032
Peak 1.000 3.576 4.576
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
193.8708 +28.1082 0.0202 41.8 166.5 1.1997 9.5 TRIG_00443861
------------------------------------------
Foreground time interval of the image:
-1.360 48.320 (delta_t = 49.680 [sec])
Background time interval of the image:
-239.616 -1.360 (delta_t = 238.256 [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 -1.360 sec. to 48.320 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31065 ( -0.303473 0.298884 )
Norm@50keV : 1.46700E-03 ( -0.000255333 0.00025533 )
------------------------------------------------------------
# Chi-Squared = 61.79 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 57 degrees of freedom
# Null hypothesis probability = 3.090120e-01
Photon flux (15-150 keV) in 49.68 sec: 0.175364 ( -0.0318918 0.0320881 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.18343e-07 ( -1.34578e-07 1.35924e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.360 sec. to 48.320 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.265116 ( -2.75014 1.2527 )
Epeak [keV] : 88.3739 ( -88.2515 -88.2515 )
Norm@50keV : 4.58579E-03 ( -0.00461112 0.0843272 )
------------------------------------------------------------
# Chi-Squared = 60.41 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 56 degrees of freedom
# Null hypothesis probability = 3.196816e-01
Photon flux (15-150 keV) in 49.68 sec: 0.166465 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.71644e-07 ( -1.63745e-07 1.544e-07 ) ergs/cm2
Band function
Time interval is from -1.360 sec. to 48.320 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.809478 ( -0.862715 -0.862715 )
beta : -2.02418 ( 2.03882 0.805618 )
Epeak [keV] : 64.0010 ( -62.9614 110.133 )
Norm@50keV : 1.66086E-02 ( -0.0205818 1.84067 )
------------------------------------------------------------
# Chi-Squared = 59.34 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 55 degrees of freedom
# Null hypothesis probability = 3.205125e-01
Photon flux (15-150 keV) in 49.68 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 3.576 sec. to 4.576 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23590 ( -0.491872 0.474091 )
Norm@50keV : 6.38452E-03 ( -0.0018666 0.00186379 )
------------------------------------------------------------
# Chi-Squared = 56.67 using 59 PHA bins.
# Reduced chi-squared = 0.9942 for 57 degrees of freedom
# Null hypothesis probability = 4.874089e-01
Photon flux (15-150 keV) in 1 sec: 0.753442 ( -0.228174 0.230598 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.41336e-08 ( -1.97839e-08 2.0082e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.576 sec. to 4.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.18996E-02 ( -2.9536 1.52995 )
Epeak [keV] : 92.5500 ( )
Norm@50keV : 2.19365E-02 ( )
------------------------------------------------------------
# Chi-Squared = 55.44 using 59 PHA bins.
# Reduced chi-squared = 0.9900 for 56 degrees of freedom
# Null hypothesis probability = 4.959428e-01
Photon flux (15-150 keV) in 1 sec: 0.719569 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.14483e-08 ( -2.01763e-08 2.07781e-08 ) ergs/cm2
Band function
Time interval is from 3.576 sec. to 4.576 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -5.46522E-02 ( 0.40339 3.42988 )
beta : -10.00000 ( 1.82168e+11 1.82168e+11 )
Epeak [keV] : 92.6253 ( -36.1764 -92.4374 )
Norm@50keV : 2.18710E-02 ( -0.0169755 0.263239 )
------------------------------------------------------------
# Chi-Squared = 55.44 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Null hypothesis probability = 4.579550e-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 28 16:22:48 EST 2011