batgrbproduct Analysis for Trigger=442539
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): Sun Jan 16 21:03:08 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger442539/GCN5_download_cron
======================================================================
Trigger: 00442539 Segment: 000
BAT Trigger Time: 316872272 [s; MET]
Trigger Stop: 316872336 [s; MET]
UTC: 2011-01-16T12:04:25.430700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 204.936033689988 Dec: 55.1603544922193 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.39
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.39
Flight Position: [ source = BAT ]
RA: 204.936033689988 Dec: 55.1603544922193 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 205.018000099335 Dec: 55.2105607880643 [deg; J2000]
{ 13h 40m 04.3s , +55d 12' 38.0" }
+/- 3.70548365910635 [arcmin] (estimated 90% radius based on SNR)
+/- 1.97437858148084 [arcmin] (formal 1-sigma fit error)
SNR: 4.6825541152935
Angular difference between Flight and Ground position is 4.118018 arcmin
Partial Coding Fraction: 0.7734375 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.241087 0.241032 0.038668 -0.031669
0.048310 0.050384 0.045378 0.041485 [error]
Peak 0.241087 0.241032 0.038668 -0.031669
0.048310 0.050384 0.045378 0.041485 [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 8.36e-08 7.77e-08 5.01e-08 4.98e-08 2.32e-07 2.61e-07 erg/cm2
Error 2.28e-08 2.49e-08 3.10e-08 5.81e-08 7.80e-08 1.12e-07 erg/cm2
Peak flux Power-law 4.31e-02 2.24e-02 7.23e-03 2.99e-03 7.45e-02 7.58e-02 ph/cm2/s
Error 1.20e-02 6.91e-03 4.33e-03 3.68e-03 1.88e-02 1.95e-02 ph/cm2/s
Fluence Cutoff-PL 8.53e-08 9.25e-08 5.60e-09 1.91e-12 1.83e-07 1.84e-07 erg/cm2
Error 2.64e-08 3.75e-08 2.67e-08 7.53e-09 4.78e-08 4.79e-08 erg/cm2
Peak flux Cutoff-PL 4.23e-02 2.81e-02 9.71e-04 1.76e-07 7.13e-02 7.14e-02 ph/cm2/s
Error 1.38e-02 1.04e-02 4.00e-03 1.76e-02 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 2.634 0.560 - - 3.48e-04 1.62e-04 43.330 57
CPL -1.263 0.845 24.3 0.0 1.98e-01 0.00e+00 39.450 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 2.634 0.560 - - 3.48e-04 1.62e-04 43.330 57
CPL -1.263 0.845 24.3 0.0 1.98e-01 0.00e+00 39.450 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
205.0180 +55.2106 0.0409 32.7 -11.4 0.4627 4.7 TRIG_00442539
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.63366 ( -0.494702 0.625111 )
Norm@50keV : 3.48274E-04 ( -0.000157142 0.000167706 )
------------------------------------------------------------
# Chi-Squared = 43.33 using 59 PHA bins.
# Reduced chi-squared = 0.7601 for 57 degrees of freedom
# Null hypothesis probability = 9.092853e-01
Photon flux (15-150 keV) in 64 sec: 7.44530E-02 ( -0.0187785 0.0188892 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31957e-07 ( -7.35667e-08 8.24531e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.26307 ( 1.30329 2.99317 )
Epeak [keV] : 24.3147 ( )
Norm@50keV : 0.197756 ( )
------------------------------------------------------------
# Chi-Squared = 39.45 using 59 PHA bins.
# Reduced chi-squared = 0.7044 for 56 degrees of freedom
# Null hypothesis probability = 9.541977e-01
Photon flux (15-150 keV) in 64 sec: 7.13421E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8341e-07 ( -2.60883e-08 6.94413e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.34229 ( -16.1429 -6.2957 )
beta : -4.64791 ( 4.69427 1.96457 )
Epeak [keV] : 24.6820 ( -5.16615 4.84205 )
Norm@50keV : 40.3106 ( -40.2659 14.3973 )
------------------------------------------------------------
# Chi-Squared = 38.87 using 59 PHA bins.
# Reduced chi-squared = 0.7067 for 55 degrees of freedom
# Null hypothesis probability = 9.511344e-01
Photon flux (15-150 keV) in 64 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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.63366 ( -0.494702 0.625111 )
Norm@50keV : 3.48274E-04 ( -0.000157142 0.000167706 )
------------------------------------------------------------
# Chi-Squared = 43.33 using 59 PHA bins.
# Reduced chi-squared = 0.7601 for 57 degrees of freedom
# Null hypothesis probability = 9.092853e-01
Photon flux (15-150 keV) in 64 sec: 7.44530E-02 ( -0.0187785 0.0188892 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31957e-07 ( -7.35667e-08 8.24531e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.26307 ( 1.30329 2.99317 )
Epeak [keV] : 24.3147 ( )
Norm@50keV : 0.197756 ( )
------------------------------------------------------------
# Chi-Squared = 39.45 using 59 PHA bins.
# Reduced chi-squared = 0.7044 for 56 degrees of freedom
# Null hypothesis probability = 9.541977e-01
Photon flux (15-150 keV) in 64 sec: 7.13421E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8341e-07 ( -2.60883e-08 6.94413e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.88815 ( -12.7399 -3.53594 )
beta : -4.74045 ( 4.69141 1.97383 )
Epeak [keV] : 24.5163 ( -5.18349 4.99897 )
Norm@50keV : 18.9773 ( -18.8816 36.3468 )
------------------------------------------------------------
# Chi-Squared = 38.88 using 59 PHA bins.
# Reduced chi-squared = 0.7068 for 55 degrees of freedom
# Null hypothesis probability = 9.510134e-01
Photon flux (15-150 keV) in 64 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:
Sun Jan 16 21:21:19 EST 2011