batgrbproduct Analysis for Trigger=450258
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 Jun 17 11:02:03 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger450258/SDC
======================================================================
Trigger: 00450258 Segment: 000
BAT Trigger Time: 323121472 [s; MET]
Trigger Stop: 323121536 [s; MET]
UTC: 2011-03-29T19:57:45.196400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 251.190490184172 Dec: 57.5925768056547 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 11.85
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.85
Flight Position: [ source = BAT ]
RA: 251.190490184172 Dec: 57.5925768056547 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 251.202911823241 Dec: 57.5716050266455 [deg; J2000]
{ 16h 44m 48.7s , +57d 34' 17.8" }
+/- 1.6205791922639 [arcmin] (estimated 90% radius based on SNR)
+/- 0.770348243439238 [arcmin] (formal 1-sigma fit error)
SNR: 15.2612265499166
Angular difference between Flight and Ground position is 1.320217 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 702.611999928951 +/- 50.884598424586
Measured from: -31.0199999809265
to: 671.591999948025 [s; relative to TRIGTIME]
T50: 353.67199999094 +/- 46.1091685222761
Measured from: 71.9919999837875
to: 425.663999974728 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 611.639999985695
to: 612.639999985695 [s; relative to TRIGTIME]
Total Fluence
Measured from: -101.611999988556
to: 727.703999996185 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.000715 4.334480 2.667137 0.607295
0.146560 0.145774 0.130496 0.116729 [error]
Peak 0.017260 0.010413 0.018620 0.009587
0.005020 0.005070 0.004661 0.003992 [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 1.11e-06 1.75e-06 2.08e-06 4.81e-06 6.33e-06 9.75e-06 erg/cm2
Error 8.17e-08 7.49e-08 1.30e-07 6.53e-07 2.96e-07 7.49e-07 erg/cm2
Peak flux Power-law 9.84e-02 1.22e-01 1.10e-01 1.73e-01 3.90e-01 5.03e-01 ph/cm2/s
Error 5.58e-02 4.19e-02 3.64e-02 1.30e-01 1.14e-01 1.56e-01 ph/cm2/s
Fluence Cutoff-PL 1.09e-06 1.76e-06 2.09e-06 4.12e-06 6.28e-06 9.06e-06 erg/cm2
Error 9.83e-08 8.69e-08 1.33e-07 1.46e-06 3.48e-07 1.53e-06 erg/cm2
Peak flux Cutoff-PL 9.83e-02 1.22e-01 1.10e-01 1.71e-01 3.90e-01 5.01e-01 ph/cm2/s
Error 7.93e-02 3.23e-02 3.80e-02 1.65e-01 1.13e-01 1.54e-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 1.749 0.083 - - 8.27e-04 3.71e-05 71.890 57
CPL 1.655 0.251 178.1 0.0 9.24e-04 0.00e+00 71.640 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 1.148 0.542 - - 3.35e-03 9.46e-04 49.760 57
CPL 1.143 0.000 9929.4 0.0 3.36e-03 0.00e+00 49.760 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 829.316 -101.612 727.704
T90 702.612 -31.020 671.592
T50 353.672 71.992 425.664
Peak 1.000 611.640 612.640
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.2029 +57.5716 0.0126 0.0 4.7 10.6514 15.3 TRIG_00450258
------------------------------------------
Foreground time interval of the image:
-101.612 727.704 (delta_t = 829.316 [sec])
Background time interval of the image:
-239.000 -101.612 (delta_t = 137.388 [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 -101.612 sec. to 727.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74943 ( -0.0823927 0.0833684 )
Norm@50keV : 8.27422E-04 ( -3.71711e-05 3.69581e-05 )
------------------------------------------------------------
# Chi-Squared = 71.89 using 59 PHA bins.
# Reduced chi-squared = 1.261 for 57 degrees of freedom
# Null hypothesis probability = 8.845887e-02
Photon flux (15-150 keV) in 829.3 sec: 0.111858 ( -0.00486834 0.00488569 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.33185e-06 ( -2.95393e-07 2.97225e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -101.612 sec. to 727.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65538 ( -0.33363 0.169046 )
Epeak [keV] : 178.079 ( )
Norm@50keV : 9.23855E-04 ( )
------------------------------------------------------------
# Chi-Squared = 71.64 using 59 PHA bins.
# Reduced chi-squared = 1.279 for 56 degrees of freedom
# Null hypothesis probability = 7.772180e-02
Photon flux (15-150 keV) in 829.3 sec: 0.111085 ( -0.005455 0.005377 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.2756e-06 ( -3.54501e-07 3.40511e-07 ) ergs/cm2
Band function
Time interval is from -101.612 sec. to 727.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.61977 ( 1.56874 1.56874 )
beta : -1.86480 ( 2.17401 12.1739 )
Epeak [keV] : 138.783 ( -178.002 -178.002 )
Norm@50keV : 9.64982E-04 ( -0.000359273 86856.4 )
------------------------------------------------------------
# Chi-Squared = 71.58 using 59 PHA bins.
# Reduced chi-squared = 1.301 for 55 degrees of freedom
# Null hypothesis probability = 6.585477e-02
Photon flux (15-150 keV) in 829.3 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 611.640 sec. to 612.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14794 ( -0.559276 0.524623 )
Norm@50keV : 3.34650E-03 ( -0.000946595 0.000946023 )
------------------------------------------------------------
# Chi-Squared = 49.76 using 59 PHA bins.
# Reduced chi-squared = 0.8730 for 57 degrees of freedom
# Null hypothesis probability = 7.408759e-01
Photon flux (15-150 keV) in 1 sec: 0.390168 ( -0.113322 0.113848 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.44717e-08 ( -1.08565e-08 1.10817e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 611.640 sec. to 612.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14276 ( )
Epeak [keV] : 9929.36 ( )
Norm@50keV : 3.36353E-03 ( )
------------------------------------------------------------
# Chi-Squared = 49.76 using 59 PHA bins.
# Reduced chi-squared = 0.8886 for 56 degrees of freedom
# Null hypothesis probability = 7.085863e-01
Photon flux (15-150 keV) in 1 sec: 0.390396 ( -0.113413 0.113191 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.44708e-08 ( -1.10297e-08 1.10833e-08 ) ergs/cm2
Band function
Time interval is from 611.640 sec. to 612.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -403171 -403171 )
beta : -1.22980 ( -0.632797 0.594645 )
Epeak [keV] : 24.5094 ( -24.4507 12.3975 )
Norm@50keV : 304.325 ( -309.125 1.54455e+06 )
------------------------------------------------------------
# Chi-Squared = 49.31 using 59 PHA bins.
# Reduced chi-squared = 0.8966 for 55 degrees of freedom
# Null hypothesis probability = 6.907068e-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 Jun 17 11:41:59 EDT 2011