batgrbproduct Analysis for Trigger=155535
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 v2.41
Process Start Time (local time): Wed Jan 9 11:56:17 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger155535/GCN5_download_cron
======================================================================
Trigger: 00155535 Segment: 000
BAT Trigger Time: 148655939.488 [s; MET]
Trigger Stop: 148655939.872 [s; MET]
UTC: 2005-09-17T13:18:59.754100 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 121.938047801988 Dec: -21.2422231183282 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33398
Image Trigger?: NO
Rate S/N Ratio: 13.076696830622 [ if not an image trigger ]
Image S/N Ratio: 33398
Flight Position: [ source = BAT ]
RA: 121.938047801988 Dec: -21.2422231183282 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 121.966100650639 Dec: -21.4622940778459 [deg; J2000]
{ 08h 07m 51.9s , -21d 27' 44.3" }
+/- 7.90820429007258 [arcmin] (estimated 90% radius based on SNR)
+/- 6.36180015159542 [arcmin] (formal 1-sigma fit error)
SNR: 1.58544061783432
RA = 8h 7m 51.9s (121.966101 deg.)
Dec = -21d 27' 44" (-21.462294 deg.)
Angular difference between Flight and Ground position is 13.296988 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
T50: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.38400000333786 second)
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.002158 -0.004411 0.005544 0.003097
0.003491 0.003471 0.003043 0.002913 [error]
Peak -0.002158 -0.004411 0.005544 0.003097
0.003491 0.003471 0.003043 0.002913 [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 9.12e-14 3.88e-10 1.33e-09 1.62e-08 3.81e-09 2.02e-08 erg/cm2
Error 8.78e-10 2.01e-09 6.67e-08 5.65e-09 0.00e+00 0.00e+00 erg/cm2
Peak flux Power-law 6.22e-06 1.60e-02 2.90e-02 1.19e-01 7.93e-02 7.67e-02 ph/cm2/s
Error 3.99e-02 4.43e-02 4.16e-01 1.31e-01 4.54e-01 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 8.40e-11 1.65e-17 2.50e-34 0.00e+00 0.00e+00 1.14e-10 erg/cm2
Error 7.35e-10 1.92e+11 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.63e-02 6.07e-04 1.67e-06 4.60e-09 4.69e-02 4.69e-02 ph/cm2/s
Error 7.06e-02 3.76e-02 4.24e-02 4.17e-01 1.24e-01 4.30e-01 ph/cm2/s
Fluence Band 6.45e-11 8.10e-10 3.31e-09 1.88e-09 5.68e-09 6.40e-09 erg/cm2
Error 3.48e-09 1.82e-08 6.29e-09 2.08e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.84e-02 9.57e-04 4.94e-02 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 0.190 0.000 - - 6.24e-04 1.08e-03 67.276 57
CPL 0.177 0.000 9998.2 0.9 6.33e-04 1.09e-03 67.272 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.190 0.000 - - 6.24e-04 1.08e-03 67.276 57
CPL 0.177 0.000 9998.2 0.9 6.33e-04 1.09e-03 67.272 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 0.384 0.000 0.384
T90 0.384 0.000 0.384
T50 0.384 0.000 0.384
Peak 0.384 0.000 0.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
121.9661 -21.4623 0.1217 31.9 -159.5 0.0101 1.6 TRIG_00155535
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-270.919 -3.520 (delta_t = 267.399 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.190476 ( )
Norm@50keV : 6.242576E-04 ( -2.623650E-07 2.155238E-03) )
------------------------------------------------------------
Chi-Squared = 67.27612 using 59 PHA bins.
Reduced chi-squared = 1.180283 for 57 degrees of freedom
Null hypothesis probability = 0.166
Photon flux (15-150 keV) in 0.3840 sec: 7.932372E-02 ( -0.0793237 0.182128 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.81447e-09 ( -3.81447e-09 7.48819e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.177281 ( )
Epeak [keV] : 9998.18 ( 0.00000 1.82227 )
Norm@50keV : 6.331152E-04 ( -2.582607E-07 2.175823E-03) )
------------------------------------------------------------
Chi-Squared = 67.27171 using 59 PHA bins.
Reduced chi-squared = 1.201280 for 56 degrees of freedom
Null hypothesis probability = 0.144
Photon flux (15-150 keV) in 0.3840 sec: 4.687565E-02 ( -0.0468756 0.201827 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.12213 ( -0.877870 14.1221 )
beta : -9.36713 ( -1.589394E-02 19.9841 )
Epeak [keV] : 9995.65 ( -9995.55 4.34668 )
Norm@50keV : 4.360337E-05 ( -2.203776E-05 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 66.95069 using 59 PHA bins.
Reduced chi-squared = 1.217285 for 55 degrees of freedom
Null hypothesis probability = 0.130
Photon flux (15-150 keV) in 0.3840 sec: 4.939965E-02 ( 1e+24 1e+24 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.6814e-09 ( -5.6814e-09 6.8933e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.190476 ( )
Norm@50keV : 6.242576E-04 ( -2.623650E-07 2.155238E-03) )
------------------------------------------------------------
Chi-Squared = 67.27612 using 59 PHA bins.
Reduced chi-squared = 1.180283 for 57 degrees of freedom
Null hypothesis probability = 0.166
Photon flux (15-150 keV) in 0.3840 sec: 7.932372E-02 ( -0.0793237 0.182128 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.81447e-09 ( -3.81447e-09 7.48819e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.177281 ( )
Epeak [keV] : 9998.18 ( 0.00000 1.82227 )
Norm@50keV : 6.331152E-04 ( -2.582607E-07 2.175823E-03) )
------------------------------------------------------------
Chi-Squared = 67.27171 using 59 PHA bins.
Reduced chi-squared = 1.201280 for 56 degrees of freedom
Null hypothesis probability = 0.144
Photon flux (15-150 keV) in 0.3840 sec: 4.687565E-02 ( -0.0468756 0.201827 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.12213 ( -0.877870 14.1221 )
beta : -9.36713 ( -1.589394E-02 19.9841 )
Epeak [keV] : 9995.65 ( -9995.55 4.34668 )
Norm@50keV : 4.360337E-05 ( -2.203776E-05 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 66.95069 using 59 PHA bins.
Reduced chi-squared = 1.217285 for 55 degrees of freedom
Null hypothesis probability = 0.130
Photon flux (15-150 keV) in 0.3840 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Wed Jan 9 12:12:28 EST 2008