batgrbproduct Analysis for Trigger=358902
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.45
Process Start Time (local time): Sat Aug 1 14:10:34 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger358902/GCN5_download_cron
======================================================================
Trigger: 00358902 Segment: 000
BAT Trigger Time: 270777058.88 [s; MET]
Trigger Stop: 270777059.904 [s; MET]
UTC: 2009-07-31T23:50:53.921040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 256.551324342333 Dec: 36.2623889426027 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.82
Image Trigger?: NO
Rate S/N Ratio: 8.06225774829855 [ if not an image trigger ]
Image S/N Ratio: 5.82
Flight Position: [ source = BAT ]
RA: 256.551324342333 Dec: 36.2623889426027 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 256.600800651313 Dec: 36.3449745976774 [deg; J2000]
{ 17h 06m 24.2s , +36d 20' 41.9" }
+/- 4.82640278855643 [arcmin] (estimated 90% radius based on SNR)
+/- 3.23451954759329 [arcmin] (formal 1-sigma fit error)
SNR: 3.21006103238734
Angular difference between Flight and Ground position is 5.502430 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: -2.98023223876953e-08
to: 1.02399995923042 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.004673 0.006535 0.013775 0.018510
0.005480 0.006011 0.006026 0.006361 [error]
Peak -0.004673 0.006535 0.013775 0.018510
0.005480 0.006011 0.006026 0.006361 [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 1.28e-10 1.08e-09 8.17e-09 3.55e-07 3.07e-08 3.64e-07 erg/cm2
Error 5.36e-10 1.93e-09 7.13e-09 4.19e-07 2.35e-08 4.23e-07 erg/cm2
Peak flux Power-law 3.82e-03 1.70e-02 6.42e-02 8.78e-01 1.88e-01 9.63e-01 ph/cm2/s
Error 1.64e-02 3.18e-02 5.75e-02 9.75e-01 1.55e-01 1.01e+00 ph/cm2/s
Fluence Cutoff-PL 1.30e-10 1.10e-09 8.25e-09 3.51e-07 3.09e-08 3.60e-07 erg/cm2
Error 5.35e-10 1.93e-09 7.14e-09 4.72e-07 2.35e-08 4.76e-07 erg/cm2
Peak flux Cutoff-PL 3.89e-03 1.73e-02 6.48e-02 8.69e-01 1.89e-01 9.55e-01 ph/cm2/s
Error 1.64e-02 3.18e-02 5.76e-02 1.09e+00 1.55e-01 1.12e+00 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 -0.912 1.670 - - 8.89e-04 1.17e-03 56.590 57
CPL -0.999 2.215 9999.4 0.0 8.65e-04 1.19e-02 56.600 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.912 1.670 - - 8.89e-04 1.17e-03 56.590 57
CPL -0.999 2.215 9999.4 0.0 8.65e-04 1.19e-02 56.600 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 -0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
256.6008 +36.3450 0.0601 9.4 111.9 0.0386 3.2 TRIG_00358902
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.880 -35.154 (delta_t = 25.726 [sec])
-33.880 -10.880 (delta_t = 23.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.912161 ( -1.8709 1.4685 )
Norm@50keV : 8.89439E-04 ( -0.000887811 0.00144313 )
------------------------------------------------------------
# Chi-Squared = 56.59 using 59 PHA bins.
# Reduced chi-squared = 0.9929 for 57 degrees of freedom
# Null hypothesis probability = 4.903003e-01
Photon flux (15-150 keV) in 1.024 sec: 0.187760 ( -0.187759 0.122709 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.07037e-08 ( -3.07037e-08 1.62192e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.999016 ( -2.89023 1.53964 )
Epeak [keV] : 9999.36 ( -9996.06 -9996.06 )
Norm@50keV : 8.65079E-04 ( -0.00087621 0.0229833 )
------------------------------------------------------------
# Chi-Squared = 56.60 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 56 degrees of freedom
# Null hypothesis probability = 4.524156e-01
Photon flux (15-150 keV) in 1.024 sec: 0.189064 ( -0.189064 0.121411 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08846e-08 ( -3.08846e-08 1.61936e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.472301 ( -0.472273 -0.472273 )
beta : 0.918226 ( -0.918292 1.85956 )
Epeak [keV] : 23.2497 ( -23.2484 -23.2484 )
Norm@50keV : 1.49431E-03 ( -0.00149423 23023.2 )
------------------------------------------------------------
# Chi-Squared = 56.59 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 4.153103e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.912161 ( -1.8709 1.4685 )
Norm@50keV : 8.89439E-04 ( -0.000887811 0.00144313 )
------------------------------------------------------------
# Chi-Squared = 56.59 using 59 PHA bins.
# Reduced chi-squared = 0.9929 for 57 degrees of freedom
# Null hypothesis probability = 4.903003e-01
Photon flux (15-150 keV) in 1.024 sec: 0.187760 ( -0.187759 0.122709 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.07037e-08 ( -3.07037e-08 1.62192e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.999016 ( -2.89023 1.53964 )
Epeak [keV] : 9999.36 ( -9996.06 -9996.06 )
Norm@50keV : 8.65079E-04 ( -0.00087621 0.0229833 )
------------------------------------------------------------
# Chi-Squared = 56.60 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 56 degrees of freedom
# Null hypothesis probability = 4.524156e-01
Photon flux (15-150 keV) in 1.024 sec: 0.189064 ( -0.189064 0.121411 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08846e-08 ( -3.08846e-08 1.61936e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.472301 ( -0.472273 -0.472273 )
beta : 0.918226 ( -0.918292 1.85956 )
Epeak [keV] : 23.2497 ( -23.2484 -23.2484 )
Norm@50keV : 1.49431E-03 ( -0.00149423 23023.2 )
------------------------------------------------------------
# Chi-Squared = 56.59 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 4.153103e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sat Aug 1 14:35:57 EDT 2009