batgrbproduct Analysis for Trigger=351525
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 03:47:28 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/351525
======================================================================
Trigger: 00351525 Segment: 000
BAT Trigger Time: 263538608.32 [s; MET]
Trigger Stop: 263538616.512 [s; MET]
UTC: 2009-05-09T05:10:03.594140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 241.403522652029 Dec: -28.4037305477642 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.05
Image Trigger?: NO
Rate S/N Ratio: 16.0312195418814 [ if not an image trigger ]
Image S/N Ratio: 7.05
Flight Position: [ source = BAT ]
RA: 241.403522652029 Dec: -28.4037305477642 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 241.420847231876 Dec: -28.3841592300693 [deg; J2000]
{ 16h 05m 41.0s , -28d 23' 03.0" }
+/- 2.13324957519863 [arcmin] (estimated 90% radius based on SNR)
+/- 1.10385021608346 [arcmin] (formal 1-sigma fit error)
SNR: 10.3052576531166
Angular difference between Flight and Ground position is 1.488323 arcmin
Partial Coding Fraction: 0.2929688 [ including projection effects ]
Duration
T90: 336.375999987125 +/- 33.2646390182625
Measured from: -47.4639999866486
to: 288.912000000477 [s; relative to TRIGTIME]
T50: 239.536000013351 +/- 12.1362869088005
Measured from: 5.34400001168251
to: 244.880000025034 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 20.7319999933243
to: 21.7319999933243 [s; relative to TRIGTIME]
Total Fluence
Measured from: -62.3959999978542
to: 298.696000009775 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.599786 2.067371 1.339474 0.429650
0.252699 0.210318 0.169595 0.147888 [error]
Peak 0.032488 0.082620 0.051915 0.020225
0.013423 0.012455 0.010920 0.008600 [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 5.48e-07 8.94e-07 1.10e-06 2.70e-06 3.31e-06 5.24e-06 erg/cm2
Error 1.08e-07 1.07e-07 1.70e-07 8.99e-07 4.07e-07 1.03e-06 erg/cm2
Peak flux Power-law 4.57e-01 4.96e-01 3.83e-01 4.84e-01 1.52e+00 1.82e+00 ph/cm2/s
Error 1.66e-01 1.12e-01 8.48e-02 2.25e-01 3.10e-01 3.52e-01 ph/cm2/s
Fluence Cutoff-PL 5.18e-07 9.27e-07 1.12e-06 1.54e-06 3.21e-06 4.11e-06 erg/cm2
Error 1.25e-07 1.28e-07 1.82e-07 1.75e-06 4.60e-07 1.60e-06 erg/cm2
Peak flux Cutoff-PL 4.21e-01 5.11e-01 3.98e-01 3.25e-01 1.49e+00 1.66e+00 ph/cm2/s
Error 1.94e-01 1.26e-01 9.87e-02 3.59e-01 3.19e-01 4.60e-01 ph/cm2/s
Fluence Band 4.99e-07 9.47e-07 1.07e-06 2.29e-06 3.24e-06 4.88e-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 3.70e-01 5.54e-01 3.83e-01 3.93e-01 1.47e+00 1.70e+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 1.695 0.207 - - 9.90e-04 1.16e-04 61.630 57
CPL 1.332 0.841 88.5 0.0 1.52e-03 0.00e+00 60.960 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 1.373 0.334 - - 1.25e-02 2.41e-03 48.810 57
CPL 0.991 0.000 140.0 0.0 1.92e-02 0.00e+00 48.530 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: 13.312000 sec.
T50 in the 50-300 keV band: 6.848000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 361.092 -62.396 298.696
T90 336.376 -47.464 288.912
T50 239.536 5.344 244.880
Peak 1.000 20.732 21.732
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
241.4208 -28.3842 0.0186 32.6 60.5 7.0565 10.3 TRIG_00351525
------------------------------------------
Foreground time interval of the image:
-62.396 293.581 (delta_t = 355.977 [sec])
Background time interval of the image:
-239.320 -62.396 (delta_t = 176.924 [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 -62.396 sec. to 298.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69533 ( -0.206285 0.207691 )
Norm@50keV : 9.89507E-04 ( -0.000116703 0.000115853 )
------------------------------------------------------------
# Chi-Squared = 61.63 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 57 degrees of freedom
# Null hypothesis probability = 3.139606e-01
Photon flux (15-150 keV) in 361.1 sec: 0.131204 ( -0.0157053 0.0157933 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.30951e-06 ( -4.0471e-07 4.08679e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -62.396 sec. to 298.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33228 ( -0.886193 0.796161 )
Epeak [keV] : 88.5463 ( )
Norm@50keV : 1.52474E-03 ( )
------------------------------------------------------------
# Chi-Squared = 60.96 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 56 degrees of freedom
# Null hypothesis probability = 3.022867e-01
Photon flux (15-150 keV) in 361.1 sec: 0.128546 ( -0.016628 0.016665 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.20606e-06 ( -4.60045e-07 4.59214e-07 ) ergs/cm2
Band function
Time interval is from -62.396 sec. to 298.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.35525 ( -3.71912 0.645214 )
beta : -9.37148 ( 9.99999 20 )
Epeak [keV] : 93.6150 ( -39.9047 -93.4972 )
Norm@50keV : 1.47093E-03 ( -0.000581783 0.00125006 )
------------------------------------------------------------
# Chi-Squared = 60.96 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 55 degrees of freedom
# Null hypothesis probability = 2.701249e-01
Photon flux (15-150 keV) in 361.1 sec: 0.128545 ( -0.016626 0.016667 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.23716e-06 ( -4.09347e-07 4.0388e-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 20.732 sec. to 21.732 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37335 ( -0.336719 0.330291 )
Norm@50keV : 1.25270E-02 ( -0.00240906 0.002409 )
------------------------------------------------------------
# Chi-Squared = 48.81 using 59 PHA bins.
# Reduced chi-squared = 0.8563 for 57 degrees of freedom
# Null hypothesis probability = 7.715605e-01
Photon flux (15-150 keV) in 1 sec: 1.51657 ( -0.308497 0.310963 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21723e-07 ( -2.48633e-08 2.50763e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 20.732 sec. to 21.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.990562 ( )
Epeak [keV] : 139.985 ( )
Norm@50keV : 1.91675E-02 ( )
------------------------------------------------------------
# Chi-Squared = 48.53 using 59 PHA bins.
# Reduced chi-squared = 0.8666 for 56 degrees of freedom
# Null hypothesis probability = 7.505828e-01
Photon flux (15-150 keV) in 1 sec: 1.49242 ( -0.31744 0.31975 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19173e-07 ( -2.72741e-08 2.6412e-08 ) ergs/cm2
Band function
Time interval is from 20.732 sec. to 21.732 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.872558 ( -0.193837 -0.193837 )
beta : -1.58905 ( 1.57547 0.478277 )
Epeak [keV] : 45.3219 ( -45.0976 163.776 )
Norm@50keV : 0.295062 ( -0.331469 165.397 )
------------------------------------------------------------
# Chi-Squared = 47.85 using 59 PHA bins.
# Reduced chi-squared = 0.8700 for 55 degrees of freedom
# Null hypothesis probability = 7.420022e-01
Photon flux (15-150 keV) in 1 sec: 1.46614 ( -0.32512 0.16307 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19047e-07 ( -2.72035e-08 2.6427e-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 11:32:34 EDT 2011