batgrbproduct Analysis for Trigger=348025
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): Thu Jun 2 11:56:18 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger348025/SDC
======================================================================
Trigger: 00348025 Segment: 000
BAT Trigger Time: 260145663.968 [s; MET]
Trigger Stop: 260145664.032 [s; MET]
UTC: 2009-03-30T22:40:59.349560 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 40.5532353454765 Dec: -27.9955276839966 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.83
Image Trigger?: NO
Rate S/N Ratio: 6.32455532033676 [ if not an image trigger ]
Image S/N Ratio: 5.83
Flight Position: [ source = BAT ]
RA: 40.5532353454765 Dec: -27.9955276839966 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 40.5695884316673 Dec: -28.0190473462917 [deg; J2000]
{ 02h 42m 16.7s , -28d 01' 08.6" }
+/- 4.13276591434846 [arcmin] (estimated 90% radius based on SNR)
+/- 2.35968126582634 [arcmin] (formal 1-sigma fit error)
SNR: 4.00658508599451
Angular difference between Flight and Ground position is 1.655857 arcmin
Partial Coding Fraction: 0.828125 [ including projection effects ]
Duration
T90: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
T50: 0.0640000104904175 +/-
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0640000104904175 second)
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0640000104904175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.006739 0.005589 -0.000765 0.000152
0.001563 0.001526 0.001265 0.001062 [error]
Peak 0.006739 0.005589 -0.000765 0.000152
0.001563 0.001526 0.001265 0.001062 [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 2.28e-09 1.73e-09 8.79e-10 6.41e-10 5.18e-09 5.51e-09 erg/cm2
Error 6.95e-10 6.86e-10 6.76e-10 1.00e-09 1.91e-09 2.38e-09 erg/cm2
Peak flux Power-law 1.18e+00 5.06e-01 1.28e-01 4.01e-02 1.84e+00 1.86e+00 ph/cm2/s
Error 3.67e-01 1.93e-01 9.57e-02 5.86e-02 5.35e-01 5.44e-01 ph/cm2/s
Fluence Cutoff-PL 2.17e-09 2.43e-09 1.59e-10 6.55e-14 4.76e-09 4.76e-09 erg/cm2
Error 8.03e-10 1.08e-09 4.39e-10 3.65e-11 1.50e-09 1.50e-09 erg/cm2
Peak flux Cutoff-PL 1.08e+00 7.35e-01 2.75e-02 6.05e-06 1.84e+00 1.84e+00 ph/cm2/s
Error 4.24e-01 3.05e-01 6.86e-02 3.01e-03 5.19e-01 5.19e-01 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 2.971 0.688 - - 6.84e-03 4.00e-03 47.090 57
CPL -2.067 0.831 24.5 0.0 2.04e+01 0.00e+00 41.760 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 2.971 0.688 - - 6.84e-03 4.00e-03 47.090 57
CPL -2.067 0.831 24.5 0.0 2.04e+01 0.00e+00 41.760 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 0.064 0.000 0.064
T90 0.064 0.000 0.064
T50 0.064 0.000 0.064
Peak 0.064 0.000 0.064
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
40.5696 -28.0190 0.0480 24.5 -139.3 0.0111 4.0 TRIG_00348025
------------------------------------------
Foreground time interval of the image:
0.000 0.064 (delta_t = 0.064 [sec])
Background time interval of the image:
-60.968 -7.968 (delta_t = 53.000 [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 0.000 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.97149 ( -0.58775 0.787913 )
Norm@50keV : 6.84207E-03 ( -0.00374175 0.00424961 )
------------------------------------------------------------
# Chi-Squared = 47.09 using 59 PHA bins.
# Reduced chi-squared = 0.8261 for 57 degrees of freedom
# Null hypothesis probability = 8.224434e-01
Photon flux (15-150 keV) in 0.064 sec: 1.84230 ( -0.530576 0.53876 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.18298e-09 ( -1.79729e-09 2.01905e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.06746 ( 2.11332 3.77556 )
Epeak [keV] : 24.5346 ( )
Norm@50keV : 20.3858 ( )
------------------------------------------------------------
# Chi-Squared = 41.76 using 59 PHA bins.
# Reduced chi-squared = 0.7456 for 56 degrees of freedom
# Null hypothesis probability = 9.216451e-01
Photon flux (15-150 keV) in 0.064 sec: 1.83762 ( -0.51808 0.52064 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.7594e-09 ( -1.43155e-09 1.56323e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.50912 ( -7.36071 -5.72579 )
beta : -9.37167 ( 10 19.9917 )
Epeak [keV] : 25.4426 ( -5.56108 4.9991 )
Norm@50keV : 208.583 ( -208.024 1418.95 )
------------------------------------------------------------
# Chi-Squared = 41.65 using 59 PHA bins.
# Reduced chi-squared = 0.7573 for 55 degrees of freedom
# Null hypothesis probability = 9.079175e-01
Photon flux (15-150 keV) in 0.064 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 0.000 sec. to 0.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.97149 ( -0.58775 0.787913 )
Norm@50keV : 6.84207E-03 ( -0.00374175 0.00424961 )
------------------------------------------------------------
# Chi-Squared = 47.09 using 59 PHA bins.
# Reduced chi-squared = 0.8261 for 57 degrees of freedom
# Null hypothesis probability = 8.224434e-01
Photon flux (15-150 keV) in 0.064 sec: 1.84230 ( -0.530576 0.53876 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.18298e-09 ( -1.79729e-09 2.01905e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.06746 ( 2.11332 3.77556 )
Epeak [keV] : 24.5346 ( )
Norm@50keV : 20.3858 ( )
------------------------------------------------------------
# Chi-Squared = 41.76 using 59 PHA bins.
# Reduced chi-squared = 0.7456 for 56 degrees of freedom
# Null hypothesis probability = 9.216451e-01
Photon flux (15-150 keV) in 0.064 sec: 1.83762 ( -0.51808 0.52064 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.7594e-09 ( -1.43155e-09 1.56323e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.57683 ( -9.58401 -7.92483 )
beta : -9.37167 ( 10 19.991 )
Epeak [keV] : 25.5760 ( -7.34084 4.92866 )
Norm@50keV : 226.313 ( -181.349 1008.19 )
------------------------------------------------------------
# Chi-Squared = 41.66 using 59 PHA bins.
# Reduced chi-squared = 0.7574 for 55 degrees of freedom
# Null hypothesis probability = 9.078222e-01
Photon flux (15-150 keV) in 0.064 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:
Thu Jun 2 13:22:12 EDT 2011