batgrbproduct Analysis for Trigger=456073
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 Jun 26 10:17:41 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger456073/GCN5_download_cron
======================================================================
Trigger: 00456073 Segment: 000
BAT Trigger Time: 330728915.52 [s; MET]
Trigger Stop: 330728916.544 [s; MET]
UTC: 2011-06-25T21:08:28.426680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 286.750429390696 Dec: 6.75284305356182 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.3
Image Trigger?: NO
Rate S/N Ratio: 144.274044789768 [ if not an image trigger ]
Image S/N Ratio: 10.3
Flight Position: [ source = BAT ]
RA: 286.750429390696 Dec: 6.75284305356182 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 286.751435333359 Dec: 6.75488391173224 [deg; J2000]
{ 19h 07m 00.3s , +06d 45' 17.6" }
+/- 1.28465229371032 [arcmin] (estimated 90% radius based on SNR)
+/- 0.560101600637932 [arcmin] (formal 1-sigma fit error)
SNR: 21.2672034038476
Angular difference between Flight and Ground position is 0.136334 arcmin
Partial Coding Fraction: 0.05566406 [ including projection effects ]
Duration
T90: 42.4839999079704 +/- 8.86307874178241
Measured from: -2.97599983215332
to: 39.5080000758171 [s; relative to TRIGTIME]
T50: 12.907999932766 +/- 1.25151428896054
Measured from: 4.04400014877319
to: 16.9520000815392 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 13.7400000095367
to: 14.7400000095367 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.18799996376038
to: 140.344000041485 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 9.766405 14.578229 12.740330 3.851336
0.261784 0.278981 0.262641 0.189554 [error]
Peak 1.055768 2.030874 2.197952 0.615778
0.070212 0.089840 0.095601 0.060642 [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 3.57e-06 6.79e-06 9.98e-06 3.15e-05 2.82e-05 5.18e-05 erg/cm2
Error 1.75e-07 1.95e-07 2.73e-07 1.98e-06 6.86e-07 2.11e-06 erg/cm2
Peak flux Power-law 1.31e+01 1.57e+01 1.36e+01 2.01e+01 4.95e+01 6.25e+01 ph/cm2/s
Error 1.15e+00 8.62e-01 7.32e-01 2.20e+00 2.42e+00 3.11e+00 ph/cm2/s
Fluence Cutoff-PL 3.40e-06 6.84e-06 1.02e-05 2.56e-05 2.80e-05 4.60e-05 erg/cm2
Error 2.34e-07 2.04e-07 3.29e-07 6.15e-06 7.24e-07 5.07e-06 erg/cm2
Peak flux Cutoff-PL 1.12e+01 1.65e+01 1.49e+01 1.14e+01 4.86e+01 5.38e+01 ph/cm2/s
Error 1.43e+00 9.76e-01 9.63e-01 3.09e+00 2.45e+00 3.90e+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 1.443 0.044 - - 2.01e-02 4.76e-04 47.900 57
CPL 1.272 0.133 248.2 3313.6 2.39e-02 3.97e-03 45.040 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 1.209 0.077 - - 4.21e-01 2.00e-02 59.270 57
CPL 0.540 0.342 124.2 44.3 8.51e-01 3.06e-01 46.460 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: 27.648000 sec.
T50 in the 50-300 keV band: 14.080000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 146.532 -6.188 140.344
T90 42.484 -2.976 39.508
T50 12.908 4.044 16.952
Peak 1.000 13.740 14.740
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
286.7514 +6.7549 0.0090 41.9 60.1 14.0131 21.3 TRIG_00456073
------------------------------------------
Foreground time interval of the image:
-6.188 11.781 (delta_t = 17.969 [sec])
Background time interval of the image:
-239.520 -6.188 (delta_t = 233.332 [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 -6.188 sec. to 140.344 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44290 ( -0.0436477 0.0436361 )
Norm@50keV : 2.01156E-02 ( -0.000475767 0.000475665 )
------------------------------------------------------------
# Chi-Squared = 47.90 using 59 PHA bins.
# Reduced chi-squared = 0.8404 for 57 degrees of freedom
# Null hypothesis probability = 7.992191e-01
Photon flux (15-150 keV) in 146.5 sec: 2.47463 ( -0.0663208 0.0665321 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.82371e-05 ( -6.85682e-07 6.86068e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.188 sec. to 140.344 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27163 ( -0.178963 0.0876592 )
Epeak [keV] : 248.169 ( -96.8057 6530.38 )
Norm@50keV : 2.38800E-02 ( -0.00339316 0.0045553 )
------------------------------------------------------------
# Chi-Squared = 45.04 using 59 PHA bins.
# Reduced chi-squared = 0.8043 for 56 degrees of freedom
# Null hypothesis probability = 8.527124e-01
Photon flux (15-150 keV) in 146.5 sec: 2.44329 ( -0.0725 0.07295 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80297e-05 ( -7.26054e-07 7.22538e-07 ) ergs/cm2
Band function
Time interval is from -6.188 sec. to 140.344 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06297 ( -0.341186 2.71574 )
beta : -1.51538 ( 1.51508 0.0816064 )
Epeak [keV] : 112.352 ( -55.6548 1512.88 )
Norm@50keV : 3.15205E-02 ( -0.0109259 0.777169 )
------------------------------------------------------------
# Chi-Squared = 44.53 using 59 PHA bins.
# Reduced chi-squared = 0.8096 for 55 degrees of freedom
# Null hypothesis probability = 8.425566e-01
Photon flux (15-150 keV) in 146.5 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 13.740 sec. to 14.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20940 ( -0.0766273 0.0767269 )
Norm@50keV : 0.421337 ( -0.0199721 0.019972 )
------------------------------------------------------------
# Chi-Squared = 59.27 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 57 degrees of freedom
# Null hypothesis probability = 3.926696e-01
Photon flux (15-150 keV) in 1 sec: 49.5228 ( -2.4144 2.41599 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.26338e-06 ( -2.20734e-07 2.21106e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.740 sec. to 14.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.540220 ( -0.354494 0.329559 )
Epeak [keV] : 124.176 ( -24.7617 63.8876 )
Norm@50keV : 0.850681 ( -0.243284 0.368579 )
------------------------------------------------------------
# Chi-Squared = 46.46 using 59 PHA bins.
# Reduced chi-squared = 0.8296 for 56 degrees of freedom
# Null hypothesis probability = 8.145778e-01
Photon flux (15-150 keV) in 1 sec: 48.6164 ( -2.4497 2.453 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.195e-06 ( -2.3e-07 2.2917e-07 ) ergs/cm2
Band function
Time interval is from 13.740 sec. to 14.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.546610 ( -0.322331 0.256859 )
beta : -9.36889 ( 9.99868 19.9987 )
Epeak [keV] : 125.016 ( -15.3443 62.2488 )
Norm@50keV : 0.844243 ( -0.202883 0.154182 )
------------------------------------------------------------
# Chi-Squared = 46.46 using 59 PHA bins.
# Reduced chi-squared = 0.8447 for 55 degrees of freedom
# Null hypothesis probability = 7.871277e-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:
Sun Jun 26 10:44:11 EDT 2011