batgrbproduct Analysis for Trigger=453788
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 May 22 03:05:17 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger453788/GCN5_download_cron
======================================================================
Trigger: 00453788 Segment: 000
BAT Trigger Time: 327685898.432 [s; MET]
Trigger Stop: 327685906.624 [s; MET]
UTC: 2011-05-21T15:51:31.455260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 120.144250897113 Dec: 45.7980888226143 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.26
Image Trigger?: NO
Rate S/N Ratio: 17.8885438199983 [ if not an image trigger ]
Image S/N Ratio: 7.26
Flight Position: [ source = BAT ]
RA: 120.144250897113 Dec: 45.7980888226143 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 120.128155370001 Dec: 45.8116795767726 [deg; J2000]
{ 08h 00m 30.8s , +45d 48' 42.0" }
+/- 2.2045078396116 [arcmin] (estimated 90% radius based on SNR)
+/- 1.02341086187873 [arcmin] (formal 1-sigma fit error)
SNR: 9.83270861007686
Angular difference between Flight and Ground position is 1.057436 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 96 +/- 36.0555127546399
Measured from: 1.56800013780594
to: 97.5680001378059 [s; relative to TRIGTIME]
T50: 35 +/- 43.1045241245046
Measured from: 6.56800013780594
to: 41.5680001378059 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.56800001859665
to: 8.56800001859665 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.568000018596649
to: 108.568000018597 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.116929 0.286432 0.304055 0.220259
0.053944 0.055741 0.050220 0.045359 [error]
Peak 0.007150 0.022598 0.016458 0.019654
0.005267 0.005727 0.005210 0.004680 [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 3.64e-08 1.05e-07 2.49e-07 1.60e-06 6.72e-07 1.99e-06 erg/cm2
Error 1.59e-08 2.69e-08 4.58e-08 7.72e-07 1.26e-07 7.80e-07 erg/cm2
Peak flux Power-law 7.36e-02 1.18e-01 1.42e-01 3.37e-01 4.31e-01 6.71e-01 ph/cm2/s
Error 5.24e-02 5.03e-02 3.96e-02 2.53e-01 1.24e-01 2.39e-01 ph/cm2/s
Fluence Cutoff-PL 3.67e-08 1.06e-07 2.49e-07 1.59e-06 6.70e-07 1.96e-06 erg/cm2
Error 1.25e-08 2.69e-08 4.82e-08 7.64e-07 1.26e-07 1.03e-06 erg/cm2
Peak flux Cutoff-PL 7.49e-02 1.19e-01 1.42e-01 3.32e-01 4.33e-01 6.57e-01 ph/cm2/s
Error 5.23e-02 5.03e-02 3.97e-02 2.58e-01 1.21e-01 2.08e-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 0.764 0.355 - - 5.24e-04 1.02e-04 53.130 57
CPL 0.765 0.358 9999.4 0.0 5.28e-04 5.36e-04 53.140 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 0.726 0.605 - - 3.73e-03 1.17e-03 66.320 57
CPL 0.744 0.657 9999.4 0.0 3.78e-03 5.07e-03 66.340 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: 95.680000 sec.
T50 in the 50-300 keV band: 41.600000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 108.000 0.568 108.568
T90 96.000 1.568 97.568
T50 35.000 6.568 41.568
Peak 1.000 7.568 8.568
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
120.1282 +45.8117 0.0195 13.8 -144.1 0.7230 9.8 TRIG_00453788
------------------------------------------
Foreground time interval of the image:
0.568 48.769 (delta_t = 48.201 [sec])
Background time interval of the image:
-239.432 0.568 (delta_t = 240.000 [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 0.568 sec. to 108.568 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.763513 ( -0.37465 0.335411 )
Norm@50keV : 5.23859E-04 ( -0.000103873 9.96968e-05 )
------------------------------------------------------------
# Chi-Squared = 53.13 using 59 PHA bins.
# Reduced chi-squared = 0.9321 for 57 degrees of freedom
# Null hypothesis probability = 6.210947e-01
Photon flux (15-150 keV) in 108 sec: 6.03038E-02 ( -0.0111818 0.0112631 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.71512e-07 ( -1.25802e-07 1.26808e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.568 sec. to 108.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.764808 ( -0.385875 0.330311 )
Epeak [keV] : 9999.36 ( -10000 -10000 )
Norm@50keV : 5.27684E-04 ( -9.65632e-05 0.000974931 )
------------------------------------------------------------
# Chi-Squared = 53.14 using 59 PHA bins.
# Reduced chi-squared = 0.9489 for 56 degrees of freedom
# Null hypothesis probability = 5.837989e-01
Photon flux (15-150 keV) in 108 sec: 6.02858E-02 ( -0.0111264 0.0112471 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.70482e-07 ( -1.24686e-07 1.27351e-07 ) ergs/cm2
Band function
Time interval is from 0.568 sec. to 108.568 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.814993 ( 0.814993 0.814993 )
beta : -0.763514 ( -0.335096 0.374654 )
Epeak [keV] : 16.7722 ( -16.7729 -16.7729 )
Norm@50keV : 7.41201E-04 ( -0.000319111 0 )
------------------------------------------------------------
# Chi-Squared = 53.13 using 59 PHA bins.
# Reduced chi-squared = 0.9660 for 55 degrees of freedom
# Null hypothesis probability = 5.464759e-01
Photon flux (15-150 keV) in 108 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 7.568 sec. to 8.568 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.726264 ( -0.678104 0.530911 )
Norm@50keV : 3.73277E-03 ( -0.00123333 0.00110149 )
------------------------------------------------------------
# Chi-Squared = 66.32 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 57 degrees of freedom
# Null hypothesis probability = 1.864715e-01
Photon flux (15-150 keV) in 1 sec: 0.430641 ( -0.123404 0.124176 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50326e-08 ( -1.30478e-08 1.32142e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.568 sec. to 8.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.744324 ( -0.802849 0.512005 )
Epeak [keV] : 9999.36 ( -9999.82 -9999.82 )
Norm@50keV : 3.78272E-03 ( -0.00108161 0.00905595 )
------------------------------------------------------------
# Chi-Squared = 66.34 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 56 degrees of freedom
# Null hypothesis probability = 1.623594e-01
Photon flux (15-150 keV) in 1 sec: 0.432544 ( -0.123492 0.119164 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.49385e-08 ( -1.29635e-08 1.33187e-08 ) ergs/cm2
Band function
Time interval is from 7.568 sec. to 8.568 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.790692 ( 0.790877 0.790877 )
beta : -0.726282 ( -0.530892 0.679393 )
Epeak [keV] : 16.8283 ( -16.8264 -16.8264 )
Norm@50keV : 5.31292E-03 ( -0.00272182 0 )
------------------------------------------------------------
# Chi-Squared = 66.32 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 55 degrees of freedom
# Null hypothesis probability = 1.410648e-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 May 22 03:23:52 EDT 2011