batgrbproduct Analysis for Trigger=345777
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 v2.45
Process Start Time (local time): Fri Aug 7 17:16:51 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/345777
======================================================================
Trigger: 00345777 Segment: 000
BAT Trigger Time: 258228088 [s; MET]
Trigger Stop: 258228152 [s; MET]
UTC: 2009-03-08T18:01:23.441660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 183.526014699304 Dec: -48.8329591097236 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.92
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.92
Flight Position: [ source = BAT ]
RA: 183.526014699304 Dec: -48.8329591097236 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 183.504479595813 Dec: -48.7285781202759 [deg; J2000]
{ 12h 14m 01.1s , -48d 43' 42.9" }
+/- 2.39498856918539 [arcmin] (estimated 90% radius based on SNR)
+/- 1.48409248588108 [arcmin] (formal 1-sigma fit error)
SNR: 8.73486738440168
Angular difference between Flight and Ground position is 6.320469 arcmin
Partial Coding Fraction: 0.890625 [ including projection effects ]
Duration
T90: 25.0959999859333 +/- 5.86202594340988
Measured from: 17.1240000128746
to: 42.2199999988079 [s; relative to TRIGTIME]
T50: 10.0080000162125 +/- 6.54140199172928
Measured from: 25.2680000066757
to: 35.2760000228882 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 16.5920000076294
to: 17.5920000076294 [s; relative to TRIGTIME]
Total Fluence
Measured from: 16.5959999859333
to: 45.3560000061989 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.257635 0.163587 0.057186 0.004593
0.029542 0.029078 0.024654 0.021992 [error]
Peak 0.021969 0.016549 0.005821 0.001316
0.005379 0.005434 0.004551 0.003925 [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 6.45e-08 7.16e-08 5.68e-08 7.44e-08 2.20e-07 2.67e-07 erg/cm2
Error 1.29e-08 1.33e-08 2.01e-08 4.96e-08 4.73e-08 7.82e-08 erg/cm2
Peak flux Power-law 1.64e-01 1.10e-01 4.81e-02 2.91e-02 3.36e-01 3.51e-01 ph/cm2/s
Error 7.06e-02 4.17e-02 3.17e-02 3.92e-02 1.20e-01 1.29e-01 ph/cm2/s
Fluence Cutoff-PL 6.16e-08 8.24e-08 4.73e-08 9.92e-09 1.99e-07 2.01e-07 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 Cutoff-PL 1.43e-01 1.41e-01 4.32e-02 2.83e-03 3.30e-01 3.30e-01 ph/cm2/s
Error 1.12e-01 6.12e-02 4.16e-02 2.85e-02 1.17e-01 1.18e-01 ph/cm2/s
Fluence Band 6.10e-08 8.22e-08 4.70e-08 9.76e-09 1.99e-07 2.07e-07 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 1.48e-01 1.40e-01 4.48e-02 3.44e-03 3.32e-01 3.27e-01 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 2.335 0.340 - - 7.97e-04 2.09e-04 58.620 57
CPL 1.090 1.396 26.7 0.0 4.83e-03 0.00e+00 56.180 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 2.191 0.702 - - 2.04e-03 1.06e-03 39.090 57
CPL 0.195 3.678 35.1 0.0 3.33e-02 0.00e+00 37.560 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 28.760 16.596 45.356
T90 25.096 17.124 42.220
T50 10.008 25.268 35.276
Peak 1.000 16.592 17.592
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
183.5045 -48.7286 0.0222 15.1 133.4 0.4700 8.7 TRIG_00345777
------------------------------------------
Foreground time interval of the image:
16.596 45.356 (delta_t = 28.760 [sec])
Background time interval of the image:
-239.000 16.596 (delta_t = 255.596 [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 16.596 sec. to 45.356 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.33527 ( -0.318057 0.362729 )
Norm@50keV : 7.96652E-04 ( -0.00021024 0.000207736 )
------------------------------------------------------------
# Chi-Squared = 58.62 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.156256e-01
Photon flux (15-150 keV) in 28.76 sec: 0.142006 ( -0.0234134 0.0234268 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20438e-07 ( -4.60488e-08 4.86277e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 16.596 sec. to 45.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09014 ( -1.8789 0.913879 )
Epeak [keV] : 26.6702 ( )
Norm@50keV : 4.83154E-03 ( )
------------------------------------------------------------
# Chi-Squared = 56.18 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 56 degrees of freedom
# Null hypothesis probability = 4.681308e-01
Photon flux (15-150 keV) in 28.76 sec: 0.138688 ( -0.023132 0.023345 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99432e-07 ( 5.04125e-08 -1.99432e-07 ) ergs/cm2
Band function
Time interval is from 16.596 sec. to 45.356 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09058 ( 1.34769 1.96266 )
beta : -10.00000 ( 5.46507e+08 5.46507e+08 )
Epeak [keV] : 26.6600 ( -25.867 12.4076 )
Norm@50keV : 4.82843E-03 ( -0.00482984 0.0751312 )
------------------------------------------------------------
# Chi-Squared = 56.18 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 55 degrees of freedom
# Null hypothesis probability = 4.304655e-01
Photon flux (15-150 keV) in 28.76 sec: 0.138635 ( -0.023089 0.023397 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98883e-07 ( -2.41282e-08 4.97099e-08 ) 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 16.592 sec. to 17.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19131 ( -0.604333 0.798854 )
Norm@50keV : 2.04074E-03 ( -0.0010677 0.00104383 )
------------------------------------------------------------
# Chi-Squared = 39.09 using 59 PHA bins.
# Reduced chi-squared = 0.6859 for 57 degrees of freedom
# Null hypothesis probability = 9.663601e-01
Photon flux (15-150 keV) in 1 sec: 0.336309 ( -0.119796 0.120071 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.91617e-08 ( -8.29577e-09 9.19971e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 16.592 sec. to 17.592 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.194638 ( -5.35782 1.9977 )
Epeak [keV] : 35.0910 ( )
Norm@50keV : 3.33314E-02 ( )
------------------------------------------------------------
# Chi-Squared = 37.56 using 59 PHA bins.
# Reduced chi-squared = 0.6708 for 56 degrees of freedom
# Null hypothesis probability = 9.723250e-01
Photon flux (15-150 keV) in 1 sec: 0.330192 ( -0.115719 0.117781 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72837e-08 ( -6.81e-09 8.697e-09 ) ergs/cm2
Band function
Time interval is from 16.592 sec. to 17.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.181168 ( -4.04568 5.97821 )
beta : -10.00000 ( 1.71164e+09 1.71164e+09 )
Epeak [keV] : 35.1115 ( -32.4625 -35.335 )
Norm@50keV : 3.39542E-02 ( -0.0406153 29.3506 )
------------------------------------------------------------
# Chi-Squared = 37.57 using 59 PHA bins.
# Reduced chi-squared = 0.6830 for 55 degrees of freedom
# Null hypothesis probability = 9.651905e-01
Photon flux (15-150 keV) in 1 sec: 0.332077 ( -0.121146 0.110633 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.72531e-08 ( -5.9047e-09 6.8927e-09 ) 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 May 27 12:17:40 EDT 2011