batgrbproduct Analysis for Trigger=455640
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 19 14:45:31 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger455640/GCN5_download_cron
======================================================================
Trigger: 00455640 Segment: 000
BAT Trigger Time: 330137984 [s; MET]
Trigger Stop: 330138048 [s; MET]
UTC: 2011-06-19T00:59:36.929380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 272.606549084085 Dec: -19.0811267227667 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.54
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.54
Flight Position: [ source = BAT ]
RA: 272.606549084085 Dec: -19.0811267227667 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.585950298102 Dec: -19.0830692742353 [deg; J2000]
{ 18h 10m 20.6s , -19d 04' 59.0" }
+/- 3.0897381486038 [arcmin] (estimated 90% radius based on SNR)
+/- 2.09699654322103 [arcmin] (formal 1-sigma fit error)
SNR: 6.07058120183955
Angular difference between Flight and Ground position is 1.173815 arcmin
Partial Coding Fraction: 0.6953125 [ including projection effects ]
Duration
T90: 221.875999927521 +/- 62.4673953970075
Measured from: -63.1159998774529
to: 158.760000050068 [s; relative to TRIGTIME]
T50: 90.2799999713898 +/- 43.0481096865496
Measured from: -10.2079998850822
to: 80.0720000863075 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 81.9480000138283
to: 82.9480000138283 [s; relative to TRIGTIME]
Total Fluence
Measured from: -69.5519999861717
to: 175.023999989033 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.711504 0.068643 0.120608 -0.009645
0.121449 0.107798 0.091465 0.081172 [error]
Peak 0.024798 0.004898 0.021294 0.005301
0.008010 0.007192 0.006163 0.005286 [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 5.06e-07 9.18e-08 8.02e-09 7.57e-10 6.07e-07 6.07e-07 erg/cm2
Error 7.91e-08 4.20e-08 9.92e-09 1.63e-09 1.08e-07 1.08e-07 erg/cm2
Peak flux Power-law 1.36e-01 1.27e-01 8.13e-02 8.04e-02 3.78e-01 4.25e-01 ph/cm2/s
Error 1.22e-01 6.36e-02 6.75e-02 1.40e-01 1.78e-01 1.98e-01 ph/cm2/s
Fluence Cutoff-PL 5.66e-07 2.44e-08 6.38e-14 5.56e-28 5.90e-07 5.90e-07 erg/cm2
Error 8.77e-08 3.00e-08 2.77e-10 0.00e+00 9.12e-08 9.13e-08 erg/cm2
Peak flux Cutoff-PL 1.39e-01 1.27e-01 8.19e-02 7.96e-02 3.79e-01 4.19e-01 ph/cm2/s
Error 1.40e-01 9.34e-02 9.54e-02 1.39e-01 1.77e-01 1.96e-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 5.518 0.782 - - 3.15e-05 2.67e-05 67.410 57
CPL 1.000 0.000 50.0 0.0 8.22e-04 0.00e+00 147.810 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 1.636 1.360 - - 2.90e-03 1.71e-03 54.520 57
CPL 3.505 0.000 397.0 0.0 4.79e-04 0.00e+00 53.250 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 244.576 -69.552 175.024
T90 221.876 -63.116 158.760
T50 90.280 -10.208 80.072
Peak 1.000 81.948 82.948
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.5860 -19.0831 0.0316 22.0 133.4 1.4824 6.1 TRIG_00455640
------------------------------------------
Foreground time interval of the image:
-69.552 74.501 (delta_t = 144.053 [sec])
Background time interval of the image:
-239.000 -69.552 (delta_t = 169.448 [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 -69.552 sec. to 175.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.51810 ( -0.735575 0.828862 )
Norm@50keV : 3.15264E-05 ( -1.87403e-05 3.46895e-05 )
------------------------------------------------------------
# Chi-Squared = 67.41 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 57 degrees of freedom
# Null hypothesis probability = 1.628357e-01
Photon flux (15-150 keV) in 244.6 sec: 8.03700E-02 ( -0.0128884 0.0129096 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.065e-07 ( -1.06366e-07 1.09734e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -69.552 sec. to 175.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 8.22180E-04 ( )
------------------------------------------------------------
# Chi-Squared = 147.81 using 59 PHA bins.
# Reduced chi-squared = 2.6395 for 56 degrees of freedom
# Null hypothesis probability = 3.256480e-10
Photon flux (15-150 keV) in 244.6 sec: 8.28515E-02 ( -0.0126592 0.0126639 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.89929e-07 ( -9.11404e-08 9.13141e-08 ) ergs/cm2
Band function
Time interval is from -69.552 sec. to 175.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.95048 ( 0.958118 7.1673 )
beta : -5.51610 ( -1.18299 0.381085 )
Epeak [keV] : 471.980 ( -471.98 -471.98 )
Norm@50keV : 4.29371E-03 ( -0.00255604 0.00470595 )
------------------------------------------------------------
# Chi-Squared = 67.41 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 55 degrees of freedom
# Null hypothesis probability = 1.216197e-01
Photon flux (15-150 keV) in 244.6 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 81.948 sec. to 82.948 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63576 ( -1.05508 1.66448 )
Norm@50keV : 2.90391E-03 ( -0.00200214 0.00141026 )
------------------------------------------------------------
# Chi-Squared = 54.52 using 59 PHA bins.
# Reduced chi-squared = 0.9566 for 57 degrees of freedom
# Null hypothesis probability = 5.685270e-01
Photon flux (15-150 keV) in 1 sec: 0.377515 ( -0.177485 0.178424 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.70285e-08 ( -2.7028e-08 1.52686e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 81.948 sec. to 82.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.50506 ( )
Epeak [keV] : 397.006 ( )
Norm@50keV : 4.78663E-04 ( )
------------------------------------------------------------
# Chi-Squared = 53.25 using 59 PHA bins.
# Reduced chi-squared = 0.9509 for 56 degrees of freedom
# Null hypothesis probability = 5.796761e-01
Photon flux (15-150 keV) in 1 sec: 0.378767 ( -0.178211 0.175742 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.69945e-08 ( -1.53567e-08 1.51183e-08 ) ergs/cm2
Band function
Time interval is from 81.948 sec. to 82.948 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62125 ( -1.01522 3.01028 )
beta : -9.36186 ( 9.92105 9.92105 )
Epeak [keV] : 9999.32 ( -1052.69 -1052.69 )
Norm@50keV : 2.90150E-03 ( -0.00146457 0.316651 )
------------------------------------------------------------
# Chi-Squared = 54.53 using 59 PHA bins.
# Reduced chi-squared = 0.9914 for 55 degrees of freedom
# Null hypothesis probability = 4.926653e-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 19 15:09:34 EDT 2011