batgrbproduct Analysis for Trigger=348152
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): Mon Aug 10 17:13:29 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/348152
======================================================================
Trigger: 00348152 Segment: 000
BAT Trigger Time: 260267729.488 [s; MET]
Trigger Stop: 260267729.552 [s; MET]
UTC: 2009-04-01T08:35:24.865740 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 95.1007140995549 Dec: -8.96344268717607 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.13
Image Trigger?: NO
Rate S/N Ratio: 41.4004830889689 [ if not an image trigger ]
Image S/N Ratio: 10.13
Flight Position: [ source = BAT ]
RA: 95.1007140995549 Dec: -8.96344268717607 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 95.0923448292485 Dec: -8.96199624551606 [deg; J2000]
{ 06h 20m 22.2s , -08d 57' 43.2" }
+/- 0.451449491801224 [arcmin] (estimated 90% radius based on SNR)
+/- 0.119859344174455 [arcmin] (formal 1-sigma fit error)
SNR: 94.74010322844
Angular difference between Flight and Ground position is 0.503560 arcmin
Partial Coding Fraction: 0.671875 [ including projection effects ]
Duration
T90: 186.50799998641 +/- 39.5070497329129
Measured from: 0.736000001430511
to: 187.243999987841 [s; relative to TRIGTIME]
T50: 7.70800000429153 +/- 1.99776677446814
Measured from: 6.78799998760223
to: 14.4959999918938 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.49199998378754
to: 7.49199998378754 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.140000015497208
to: 326.136000007391 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.977640 5.477200 5.145296 1.607182
0.096987 0.103242 0.096073 0.090995 [error]
Peak 0.393198 0.885792 1.222564 0.490996
0.012105 0.017203 0.020541 0.017064 [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 1.16e-06 2.41e-06 3.89e-06 1.41e-05 1.08e-05 2.15e-05 erg/cm2
Error 5.98e-08 6.99e-08 1.02e-07 9.03e-07 2.55e-07 9.35e-07 erg/cm2
Peak flux Power-law 3.88e+00 6.24e+00 7.58e+00 1.81e+01 2.29e+01 3.58e+01 ph/cm2/s
Error 1.44e-01 1.42e-01 1.50e-01 7.64e-01 4.18e-01 8.45e-01 ph/cm2/s
Fluence Cutoff-PL 1.16e-06 2.41e-06 3.89e-06 1.40e-05 1.08e-05 2.14e-05 erg/cm2
Error 6.06e-08 6.99e-08 1.01e-07 8.88e-07 2.55e-07 1.35e-06 erg/cm2
Peak flux Cutoff-PL 3.64e+00 6.37e+00 7.87e+00 1.37e+01 2.28e+01 3.15e+01 ph/cm2/s
Error 1.78e-01 1.56e-01 1.97e-01 1.72e+00 4.20e-01 1.70e+00 ph/cm2/s
Fluence Band 1.12e-06 2.36e-06 3.87e-06 1.42e-05 1.07e-05 2.15e-05 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 3.64e+00 6.37e+00 7.87e+00 1.37e+01 2.28e+01 3.15e+01 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 1.308 0.045 - - 3.34e-03 7.66e-05 62.970 57
CPL 1.305 0.076 9869.0 -228.4 3.35e-03 2.10e-04 63.070 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 0.720 0.031 - - 1.98e-01 3.67e-03 92.270 57
CPL 0.457 0.123 342.1 159.9 2.60e-01 3.23e-02 78.120 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: 9.344000 sec.
T50 in the 50-300 keV band: 2.048000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 326.276 -0.140 326.136
T90 186.508 0.736 187.244
T50 7.708 6.788 14.496
Peak 1.000 6.492 7.492
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
95.0923 -8.9620 0.0020 33.1 3.9 10.6201 94.7 TRIG_00348152
------------------------------------------
Foreground time interval of the image:
-0.140 9.413 (delta_t = 9.553 [sec])
Background time interval of the image:
-239.488 -0.140 (delta_t = 239.348 [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 -0.140 sec. to 326.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30818 ( -0.0454949 0.0453047 )
Norm@50keV : 3.34330E-03 ( -7.66819e-05 7.65942e-05 )
------------------------------------------------------------
# Chi-Squared = 62.97 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.732533e-01
Photon flux (15-150 keV) in 326.3 sec: 0.399471 ( -0.0102653 0.0103033 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07589e-05 ( -2.54554e-07 2.55076e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.140 sec. to 326.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30491 ( -0.106609 0.0449945 )
Epeak [keV] : 9869.02 ( -588.258 -1045.02 )
Norm@50keV : 3.35151E-03 ( -7.62468e-05 0.000342799 )
------------------------------------------------------------
# Chi-Squared = 63.07 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 56 degrees of freedom
# Null hypothesis probability = 2.407183e-01
Photon flux (15-150 keV) in 326.3 sec: 0.399202 ( -0.01019 0.010301 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07593e-05 ( -2.53535e-07 2.56407e-07 ) ergs/cm2
Band function
Time interval is from -0.140 sec. to 326.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.03047 ( 1.03048 1.03048 )
beta : -1.30816 ( -0.0453167 0.0454103 )
Epeak [keV] : 44.2190 ( -44.2175 -44.2175 )
Norm@50keV : 6.46211E-03 ( -0.00222349 0 )
------------------------------------------------------------
# Chi-Squared = 62.97 using 59 PHA bins.
# Reduced chi-squared = 1.145 for 55 degrees of freedom
# Null hypothesis probability = 2.149913e-01
Photon flux (15-150 keV) in 326.3 sec: 0.393106 ( -0.008902 0.009189 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06797e-05 ( -2.49261e-07 2.6029e-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 6.492 sec. to 7.492 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.719927 ( -0.0307059 0.0305537 )
Norm@50keV : 0.198222 ( -0.00367282 0.00367049 )
------------------------------------------------------------
# Chi-Squared = 92.27 using 59 PHA bins.
# Reduced chi-squared = 1.619 for 57 degrees of freedom
# Null hypothesis probability = 2.148495e-03
Photon flux (15-150 keV) in 1 sec: 22.8786 ( -0.417768 0.41775 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39807e-06 ( -5.01622e-08 5.0203e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.492 sec. to 7.492 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.456949 ( -0.124896 0.121288 )
Epeak [keV] : 342.071 ( -90.1576 229.556 )
Norm@50keV : 0.260150 ( -0.0298975 0.034649 )
------------------------------------------------------------
# Chi-Squared = 78.12 using 59 PHA bins.
# Reduced chi-squared = 1.395 for 56 degrees of freedom
# Null hypothesis probability = 2.703049e-02
Photon flux (15-150 keV) in 1 sec: 22.7942 ( -0.4201 0.42 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37868e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 6.492 sec. to 7.492 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99995 ( -39287.8 -39287.8 )
beta : -0.735881 ( -0.0376677 0.0356014 )
Epeak [keV] : 24.1377 ( -24.2458 3.18534 )
Norm@50keV : 1.26307E+04 ( -6060.28 1.51458e+07 )
------------------------------------------------------------
# Chi-Squared = 90.09 using 59 PHA bins.
# Reduced chi-squared = 1.638 for 55 degrees of freedom
# Null hypothesis probability = 1.987869e-03
Photon flux (15-150 keV) in 1 sec: 22.7942 ( -0.4201 0.42 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36945e-06 ( -5.2115e-08 5.1925e-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:
Thu Jun 2 10:37:23 EDT 2011