batgrbproduct Analysis for Trigger=451165
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): Tue Apr 12 11:00:36 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger451165/GCN5_download_cron
======================================================================
Trigger: 00451165 Segment: 000
BAT Trigger Time: 324243258.688 [s; MET]
Trigger Stop: 324243259.712 [s; MET]
UTC: 2011-04-11T19:34:11.842080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 291.436981024355 Dec: 67.7320243410843 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.94
Image Trigger?: NO
Rate S/N Ratio: 12 [ if not an image trigger ]
Image S/N Ratio: 6.94
Flight Position: [ source = BAT ]
RA: 291.436981024355 Dec: 67.7320243410843 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 291.448605078474 Dec: 67.7043253369584 [deg; J2000]
{ 19h 25m 47.7s , +67d 42' 15.6" }
+/- 0.729879615671775 [arcmin] (estimated 90% radius based on SNR)
+/- 0.250545250454187 [arcmin] (formal 1-sigma fit error)
SNR: 47.6950994844762
Angular difference between Flight and Ground position is 1.682848 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 79.3999999761581 +/- 5.30609654362747
Measured from: -7.59999990463257
to: 71.8000000715256 [s; relative to TRIGTIME]
T50: 51.5439999103546 +/- 2.48366266590847
Measured from: 4.79600012302399
to: 56.3400000333786 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.73199999332428
to: 5.73199999332428 [s; relative to TRIGTIME]
Total Fluence
Measured from: -16.9120000004768
to: 86.3079999685287 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.406532 2.666500 1.242868 0.176512
0.063757 0.065775 0.057408 0.049117 [error]
Peak 0.053586 0.068109 0.040769 -0.000149
0.006773 0.007184 0.006337 0.005123 [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 8.00e-07 1.06e-06 1.03e-06 1.79e-06 3.48e-06 4.69e-06 erg/cm2
Error 4.69e-08 3.71e-08 5.75e-08 2.10e-07 1.31e-07 2.59e-07 erg/cm2
Peak flux Power-law 5.11e-01 4.48e-01 2.70e-01 2.45e-01 1.33e+00 1.47e+00 ph/cm2/s
Error 9.44e-02 5.64e-02 5.02e-02 8.72e-02 1.68e-01 1.90e-01 ph/cm2/s
Fluence Cutoff-PL 7.37e-07 1.11e-06 1.02e-06 7.97e-07 3.30e-06 3.67e-06 erg/cm2
Error 5.75e-08 4.59e-08 6.28e-08 3.45e-07 1.62e-07 3.89e-07 erg/cm2
Peak flux Cutoff-PL 4.58e-01 5.00e-01 2.75e-01 8.27e-02 1.29e+00 1.32e+00 ph/cm2/s
Error 1.08e-01 7.58e-02 5.86e-02 1.94e-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 4.64e-01 1.34e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 1.05e-01 1.98e-01 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 2.040 0.070 - - 3.65e-03 1.45e-04 57.190 57
CPL 1.499 0.314 42.0 8.1 7.08e-03 2.79e-03 47.330 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 1.733 0.216 - - 9.92e-03 1.43e-03 61.050 57
CPL 0.784 1.005 56.7 64.8 3.35e-02 7.21e-02 57.570 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: 75.200000 sec.
T50 in the 50-300 keV band: 49.536000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 103.220 -16.912 86.308
T90 79.400 -7.600 71.800
T50 51.544 4.796 56.340
Peak 1.000 4.732 5.732
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
291.4486 +67.7043 0.0040 20.6 -88.3 6.1790 47.7 TRIG_00451165
------------------------------------------
Foreground time interval of the image:
-16.912 70.913 (delta_t = 87.825 [sec])
Background time interval of the image:
-239.688 -16.912 (delta_t = 222.776 [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 -16.912 sec. to 86.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03973 ( -0.0699683 0.0709324 )
Norm@50keV : 3.64985E-03 ( -0.000145349 0.000144433 )
------------------------------------------------------------
# Chi-Squared = 57.19 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 57 degrees of freedom
# Null hypothesis probability = 4.678411e-01
Photon flux (15-150 keV) in 103.2 sec: 0.557724 ( -0.0207511 0.0208211 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48204e-06 ( -1.30353e-07 1.30908e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -16.912 sec. to 86.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49917 ( -0.326155 0.301938 )
Epeak [keV] : 41.9730 ( -9.09342 7.04123 )
Norm@50keV : 7.07850E-03 ( -0.00215054 0.00343598 )
------------------------------------------------------------
# Chi-Squared = 47.33 using 59 PHA bins.
# Reduced chi-squared = 0.8452 for 56 degrees of freedom
# Null hypothesis probability = 7.887036e-01
Photon flux (15-150 keV) in 103.2 sec: 0.536010 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.29812e-06 ( -1.61787e-07 1.63087e-07 ) ergs/cm2
Band function
Time interval is from -16.912 sec. to 86.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14597 ( -0.574571 1.22817 )
beta : -2.32556 ( 2.32597 0.197148 )
Epeak [keV] : 38.1472 ( -8.38579 8.76305 )
Norm@50keV : 1.18314E-02 ( -0.00672412 0.0773166 )
------------------------------------------------------------
# Chi-Squared = 46.04 using 59 PHA bins.
# Reduced chi-squared = 0.8371 for 55 degrees of freedom
# Null hypothesis probability = 7.998118e-01
Photon flux (15-150 keV) in 103.2 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 4.732 sec. to 5.732 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73257 ( -0.210579 0.220537 )
Norm@50keV : 9.92226E-03 ( -0.00144115 0.00141379 )
------------------------------------------------------------
# Chi-Squared = 61.05 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 57 degrees of freedom
# Null hypothesis probability = 3.324980e-01
Photon flux (15-150 keV) in 1 sec: 1.33314 ( -0.167509 0.167539 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.1654e-08 ( -1.36733e-08 1.39657e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.732 sec. to 5.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.783931 ( -1.13201 0.87742 )
Epeak [keV] : 56.7156 ( -13.772 115.871 )
Norm@50keV : 3.34733E-02 ( -0.0334726 0.110749 )
------------------------------------------------------------
# Chi-Squared = 57.57 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 56 degrees of freedom
# Null hypothesis probability = 4.167957e-01
Photon flux (15-150 keV) in 1 sec: 1.29386 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.44541e-08 ( -1.45796e-08 1.53429e-08 ) ergs/cm2
Band function
Time interval is from 4.732 sec. to 5.732 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.783851 ( -0.513349 1.54954 )
beta : -10.00000 ( 4.06012e+11 4.06012e+11 )
Epeak [keV] : 56.7040 ( -13.7696 115.878 )
Norm@50keV : 3.34760E-02 ( -0.033476 0.110868 )
------------------------------------------------------------
# Chi-Squared = 57.57 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 55 degrees of freedom
# Null hypothesis probability = 3.802167e-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:
Tue Apr 12 11:22:08 EDT 2011