batgrbproduct Analysis for Trigger=452685
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): Sat May 7 10:22:09 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger452685/batgroup_hand_proc
======================================================================
Trigger: 00452685 Segment: 000
BAT Trigger Time: 326136952.448 [s; MET]
Trigger Stop: 326136953.472 [s; MET]
UTC: 2011-05-03T17:35:45.530200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 132.79984224966 Dec: 52.2156973681742 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.4
Image Trigger?: NO
Rate S/N Ratio: 134.029847422132 [ if not an image trigger ]
Image S/N Ratio: 20.4
Flight Position: [ source = BAT ]
RA: 132.79984224966 Dec: 52.2156973681742 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 132.799049866048 Dec: 52.2111729461752 [deg; J2000]
{ 08h 51m 11.8s , +52d 12' 40.2" }
+/- 0.986400663344396 [arcmin] (estimated 90% radius based on SNR)
+/- 0.356751051706813 [arcmin] (formal 1-sigma fit error)
SNR: 31.0179853275063
Angular difference between Flight and Ground position is 0.273024 arcmin
Partial Coding Fraction: 0.1191406 [ including projection effects ]
Duration
T90: 10.0480000376701 +/- 3.40544507260987
Measured from: -1.72000002861023
to: 8.32800000905991 [s; relative to TRIGTIME]
T50: 2.92800003290176 +/- 0.258487925441165
Measured from: -0.120000004768372
to: 2.80800002813339 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.11599999666214
to: 0.88400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.58399999141693
to: 16.2960000038147 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.932136 4.917803 4.925133 1.392826
0.120106 0.135924 0.138122 0.132933 [error]
Peak 0.578451 1.108388 1.475159 0.435551
0.036609 0.048521 0.054448 0.040239 [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 1.20e-06 2.40e-06 3.76e-06 1.30e-05 1.05e-05 2.04e-05 erg/cm2
Error 7.44e-08 8.84e-08 1.41e-07 1.10e-06 3.52e-07 1.17e-06 erg/cm2
Peak flux Power-law 7.38e+00 9.44e+00 8.82e+00 1.45e+01 3.05e+01 4.01e+01 ph/cm2/s
Error 6.14e-01 4.95e-01 4.18e-01 1.39e+00 1.37e+00 1.85e+00 ph/cm2/s
Fluence Cutoff-PL 1.06e-06 2.48e-06 3.94e-06 7.36e-06 1.02e-05 1.48e-05 erg/cm2
Error 9.69e-08 9.82e-08 1.69e-07 2.08e-06 3.80e-07 2.08e-06 erg/cm2
Peak flux Cutoff-PL 5.65e+00 9.95e+00 1.01e+01 6.87e+00 2.97e+01 3.25e+01 ph/cm2/s
Error 7.77e-01 5.64e-01 5.89e-01 1.60e+00 1.39e+00 2.10e+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 1.354 0.057 - - 4.70e-02 1.48e-03 95.540 57
CPL 0.881 0.254 133.1 54.5 7.67e-02 2.01e-02 84.350 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 1.098 0.070 - - 2.63e-01 1.15e-02 84.770 57
CPL 0.100 0.356 111.8 21.9 7.22e-01 2.60e-01 56.620 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: 7.808000 sec.
T50 in the 50-300 keV band: 1.984000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 22.880 -6.584 16.296
T90 10.048 -1.720 8.328
T50 2.928 -0.120 2.808
Peak 1.000 -0.116 0.884
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
132.7990 52.2112 0.0062 48.6612 23.5340 14.4254848 31.018 TRIG_00452685
Foreground time interval of the image:
-6.584 15.453 (delta_t = 22.037 [sec])
Background time interval of the image:
-179.448 -6.584 (delta_t = 172.864 [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 -6.584 sec. to 16.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35376 ( -0.0565153 0.0565094 )
Norm@50keV : 4.69608E-02 ( -0.00147845 0.00147841 )
------------------------------------------------------------
# Chi-Squared = 95.54 using 59 PHA bins.
# Reduced chi-squared = 1.676 for 57 degrees of freedom
# Null hypothesis probability = 1.049594e-03
Photon flux (15-150 keV) in 22.88 sec: 5.66183 ( -0.191745 0.19215 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04852e-05 ( -3.51647e-07 3.52142e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.584 sec. to 16.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.880709 ( -0.260787 0.246423 )
Epeak [keV] : 133.129 ( -28.3071 80.7759 )
Norm@50keV : 7.67349E-02 ( -0.0169608 0.0232265 )
------------------------------------------------------------
# Chi-Squared = 84.35 using 59 PHA bins.
# Reduced chi-squared = 1.506 for 56 degrees of freedom
# Null hypothesis probability = 8.493773e-03
Photon flux (15-150 keV) in 22.88 sec: 5.50520 ( -0.20544 0.20676 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02376e-05 ( -3.81204e-07 3.79396e-07 ) ergs/cm2
Band function
Time interval is from -6.584 sec. to 16.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.655666 ( -0.402653 0.471219 )
beta : -1.63542 ( 1.63556 0.164174 )
Epeak [keV] : 97.9197 ( -26.9945 80.5578 )
Norm@50keV : 0.101759 ( -0.0378778 0.0810437 )
------------------------------------------------------------
# Chi-Squared = 83.03 using 59 PHA bins.
# Reduced chi-squared = 1.510 for 55 degrees of freedom
# Null hypothesis probability = 8.658498e-03
Photon flux (15-150 keV) in 22.88 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 -0.116 sec. to 0.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09835 ( -0.0696375 0.0694281 )
Norm@50keV : 0.263150 ( -0.0115142 0.0115085 )
------------------------------------------------------------
# Chi-Squared = 84.77 using 59 PHA bins.
# Reduced chi-squared = 1.487 for 57 degrees of freedom
# Null hypothesis probability = 9.929021e-03
Photon flux (15-150 keV) in 1 sec: 30.5189 ( -1.37177 1.37281 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.75275e-06 ( -1.28665e-07 1.28807e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.116 sec. to 0.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.100236 ( -0.370089 0.342193 )
Epeak [keV] : 111.840 ( -15.532 28.2181 )
Norm@50keV : 0.722056 ( -0.206128 0.313411 )
------------------------------------------------------------
# Chi-Squared = 56.62 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 56 degrees of freedom
# Null hypothesis probability = 4.517983e-01
Photon flux (15-150 keV) in 1 sec: 29.7303 ( -1.3931 1.3958 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.70179e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.116 sec. to 0.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.100132 ( -0.23425 0.280946 )
beta : -10.00000 ( 2.4876e+10 2.4876e+10 )
Epeak [keV] : 111.821 ( -15.5309 28.2148 )
Norm@50keV : 0.722164 ( -0.206206 0.313617 )
------------------------------------------------------------
# Chi-Squared = 56.62 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 4.144154e-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:
Sat May 7 10:59:28 EDT 2011