batgrbproduct Analysis for Trigger=353627
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 v2.45
Process Start Time (local time): Tue Aug 11 08:36:04 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/353627
======================================================================
Trigger: 00353627 Segment: 000
BAT Trigger Time: 265427122.176 [s; MET]
Trigger Stop: 265427123.2 [s; MET]
UTC: 2009-05-31T01:45:17.389720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 178.687245045651 Dec: 7.79948396161114 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.22
Image Trigger?: NO
Rate S/N Ratio: 9 [ if not an image trigger ]
Image S/N Ratio: 7.22
Flight Position: [ source = BAT ]
RA: 178.687245045651 Dec: 7.79948396161114 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 178.66430292002 Dec: 7.82967618246984 [deg; J2000]
{ 11h 54m 39.4s , +07d 49' 46.8" }
+/- 1.06919564911491 [arcmin] (estimated 90% radius based on SNR)
+/- 0.449741128960378 [arcmin] (formal 1-sigma fit error)
SNR: 27.6444605010386
Angular difference between Flight and Ground position is 2.267477 arcmin
Partial Coding Fraction: 0.734375 [ including projection effects ]
Duration
T90: 42.8000000119209 +/- 8.08223434240787
Measured from: -16.8079999983311
to: 25.9920000135899 [s; relative to TRIGTIME]
T50: 15.0040000081062 +/- 1.80305630842973
Measured from: -1.21200001239777
to: 13.7919999957085 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 9.29199999570847
to: 10.2919999957085 [s; relative to TRIGTIME]
Total Fluence
Measured from: -25.5399999916553
to: 34.608000010252 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.720954 1.076535 0.735958 0.110662
0.044600 0.047169 0.042810 0.038903 [error]
Peak 0.033089 0.060454 0.052940 0.013857
0.006234 0.006653 0.006192 0.005225 [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 2.40e-07 4.21e-07 5.64e-07 1.55e-06 1.64e-06 2.77e-06 erg/cm2
Error 2.12e-08 2.28e-08 4.20e-08 2.45e-07 9.99e-08 2.79e-07 erg/cm2
Peak flux Power-law 3.20e-01 3.93e-01 3.51e-01 5.41e-01 1.25e+00 1.60e+00 ph/cm2/s
Error 7.08e-02 5.39e-02 4.84e-02 1.56e-01 1.51e-01 2.06e-01 ph/cm2/s
Fluence Cutoff-PL 2.18e-07 4.49e-07 5.72e-07 6.02e-07 1.54e-06 1.84e-06 erg/cm2
Error 2.50e-08 2.92e-08 4.61e-08 3.51e-07 1.16e-07 3.67e-07 erg/cm2
Peak flux Cutoff-PL 2.91e-01 4.11e-01 3.68e-01 3.19e-01 1.23e+00 1.39e+00 ph/cm2/s
Error 8.34e-02 6.34e-02 5.71e-02 1.55e-01 3.07e-01 0.00e+00 ph/cm2/s
Fluence Band 2.13e-07 4.57e-07 5.48e-07 1.14e-06 1.57e-06 2.36e-06 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 2.71e-01 4.38e-01 3.52e-01 4.55e-01 1.23e+00 1.52e+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 1.578 0.095 - - 2.91e-03 1.62e-04 73.760 57
CPL 0.940 0.424 78.6 34.4 6.27e-03 3.38e-03 66.050 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 1.164 0.200 - - 1.07e-02 1.27e-03 80.300 57
CPL 0.684 0.752 143.1 0.0 1.84e-02 0.00e+00 79.210 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: 38.912000 sec.
T50 in the 50-300 keV band: 12.416000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 60.148 -25.540 34.608
T90 42.800 -16.808 25.992
T50 15.004 -1.212 13.792
Peak 1.000 9.292 10.292
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
178.6643 +7.8297 0.0070 20.5 -77.7 2.6597 27.6 TRIG_00353627
------------------------------------------
Foreground time interval of the image:
-25.540 34.608 (delta_t = 60.148 [sec])
Background time interval of the image:
-438.075 -367.137 (delta_t = 70.938 [sec])
-239.176 -25.540 (delta_t = 213.636 [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 -25.540 sec. to 34.608 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57751 ( -0.0945775 0.0954312 )
Norm@50keV : 2.90585E-03 ( -0.000162333 0.00016157 )
------------------------------------------------------------
# Chi-Squared = 73.76 using 59 PHA bins.
# Reduced chi-squared = 1.294 for 57 degrees of freedom
# Null hypothesis probability = 6.699646e-02
Photon flux (15-150 keV) in 60.15 sec: 0.370862 ( -0.0198916 0.0199082 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63928e-06 ( -9.94815e-08 1.00266e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -25.540 sec. to 34.608 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.940128 ( -0.44592 0.402528 )
Epeak [keV] : 78.6167 ( -15.5602 53.3222 )
Norm@50keV : 6.26887E-03 ( -0.00236968 0.0043807 )
------------------------------------------------------------
# Chi-Squared = 66.05 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 56 degrees of freedom
# Null hypothesis probability = 1.684102e-01
Photon flux (15-150 keV) in 60.15 sec: 0.358636 ( -0.021248 0.021239 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54033e-06 ( -1.15037e-07 1.17202e-07 ) ergs/cm2
Band function
Time interval is from -25.540 sec. to 34.608 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.379198 ( -1.55989 -0.391395 )
beta : -1.81424 ( 1.81331 0.179191 )
Epeak [keV] : 41.6316 ( -12.4324 55.7447 )
Norm@50keV : 4.89813E-02 ( -0.0526314 59.1408 )
------------------------------------------------------------
# Chi-Squared = 64.18 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 55 degrees of freedom
# Null hypothesis probability = 1.857206e-01
Photon flux (15-150 keV) in 60.15 sec: 0.359087 ( -0.02366 0.020271 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.56753e-06 ( -1.08745e-07 1.04944e-07 ) 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 9.292 sec. to 10.292 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16392 ( -0.202283 0.19852 )
Norm@50keV : 1.07087E-02 ( -0.00127387 0.00127379 )
------------------------------------------------------------
# Chi-Squared = 80.30 using 59 PHA bins.
# Reduced chi-squared = 1.409 for 57 degrees of freedom
# Null hypothesis probability = 2.270274e-02
Photon flux (15-150 keV) in 1 sec: 1.25097 ( -0.151408 0.151588 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09784e-07 ( -1.4588e-08 1.47261e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.292 sec. to 10.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.683718 ( -0.927611 0.577325 )
Epeak [keV] : 143.141 ( )
Norm@50keV : 1.84416E-02 ( )
------------------------------------------------------------
# Chi-Squared = 79.21 using 59 PHA bins.
# Reduced chi-squared = 1.414 for 56 degrees of freedom
# Null hypothesis probability = 2.231513e-02
Photon flux (15-150 keV) in 1 sec: 1.23116 ( -0.15535 0.1551 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06255e-07 ( 1.5943e-08 -1.06255e-07 ) ergs/cm2
Band function
Time interval is from 9.292 sec. to 10.292 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.39775 ( -10.2139 -2.91579 )
beta : -1.36172 ( -0.332797 0.283435 )
Epeak [keV] : 34.8721 ( -15.772 97.2493 )
Norm@50keV : 13.5051 ( -15.2773 66.9397 )
------------------------------------------------------------
# Chi-Squared = 77.55 using 59 PHA bins.
# Reduced chi-squared = 1.410 for 55 degrees of freedom
# Null hypothesis probability = 2.427643e-02
Photon flux (15-150 keV) in 1 sec: 1.23132 ( -0.15299 0.14798 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06177e-07 ( -1.60735e-08 1.5934e-08 ) 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:
Fri May 27 11:08:36 EDT 2011