batgrbproduct analysis for trigger=274153

Analysis for Ground-detected GRB: Trigger=274153

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This is a special analysis for ground-detected GRB. The event data duration is likely to be shorter than the burst duration. In such cases, the burst durations are found using the quad-rate data, and spectral analyses are only available for event data range.
3) Some mask-weighted light curve plots might be missing because the time range is not completely covered by the event data range.

==========================================================================
           BAT GROUND-DETECTED GRB DATA PROCESSING REPORT                 
    Process Script: hand-made scripts that follow steps in batgrbproduct
                    but without using TDRSS info
    Process Start Time: Tue Sep 30 00:04:36 EDT 2014
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
==========================================================================
 
  BAT Trigger Time: 197513440.336
               UTC: 2007-04-06T00:50:38.465   [includes UTCF correction]
       Where From?: Ground analysis (best_duration.txt)
  NOTE: BAT trigger time for ground-detected burst is the T100 start time.
 
  Analysis Position:   [ source = GCN ]
    RA: 198.969   Dec: 16.481  [deg; J2000]
 
  Refined Position:   [ source = BAT pre-slew image ]
    RA: 198.969   Dec: 16.481  [deg; J2000]
        { 13h 15m 52.6s , +16d 28' 51.6" }
        +/- 4.11381286738 [arcmin] (estimated 90% radius based on SNR)
    SNR: 4.03350879953
 
  Angular difference between the GCN position (ra=198.969, dec=16.481 deg) and this refined position is 0.000 arcmin
 
  Partial Coding Fraction: 9.218750e-01    [ including projection effects ]
 
  Duration (found by FRED-model fit)
     T90: 0.816 +/- N/A
        Measured from: 0.016
                   to: 0.832     [s; relative to TRIGTIME]
     T50: 0.304 +/- N/A
        Measured from: 0.08
                   to: 0.384
 
=== 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 3.62e-09 7.32e-09 1.15e-08 4.02e-08 3.21e-08 6.26e-08   erg/cm2
              Error 2.32e-09 2.80e-09 5.22e-09 4.50e-08 1.27e-08 4.81e-08   erg/cm2
Peak flux Power-law 1.06e-01 1.30e-01 1.16e-01 1.77e-01 4.13e-01 5.29e-01   ph/cm2/s
              Error 6.00e-02 4.45e-02 3.77e-02 1.32e-01 1.20e-01 1.61e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.63e-09 7.31e-09 1.14e-08 3.68e-08 3.23e-08 5.92e-08   erg/cm2
              Error 2.45e-09 2.98e-09 5.43e-09 5.22e-08 1.29e-08 6.30e-08   erg/cm2
Peak flux Cutoff-PL 1.07e-01 1.31e-01 1.15e-01 1.74e-01 4.14e-01 5.27e-01   ph/cm2/s
              Error 6.62e-02 4.77e-02 2.99e-02 1.70e-01 1.21e-01 1.84e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.345    0.699    -      -           2.56e-03 9.01e-04   53.190 57
CPL   2.078    0.000      29.4    0.0      9.89e-04 0.00e+00   53.150 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.172    0.536    -      -           3.54e-03 9.95e-04   44.550 57
CPL   1.175    0.540    9999.4    0.0      3.55e-03 1.00e-03   44.550 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

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    1.280    0.000    1.280
T90     0.816    0.016    0.832
T50     0.304    0.080    0.384
Peak    1.000   -0.493    0.507

Click here for the BAT GCN circular template

Special notes of this burst

Image

15.0-350.0 keV image (Event data)

#RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
198.969 16.481 0.000 23.571 177.635 0.042 4.034 TRIG_00274153
 
Image time interval: 0.000 to 1.280 [sec]

Lightcurves

Notes:

1) The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
2) 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 (for the best duration plot, slew times are marked by green arrows).
3) For lightcurves in unit of count rate, time of each bin is in the middle of the bin.

Best duration plot

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)

Quad-rate summed light curves (from T0-300s to T0+1000s)

Spectral Evolution

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    1.280 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.34469     ( -0.700749   0.696617 )
Norm@50keV  : 2.56213E-03    ( -0.00091033   0.000892062 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.19 using 59 PHA bins.
# Reduced chi-squared =         0.9332 for     57 degrees of freedom 
# Null hypothesis probability =   6.186238e-01
 
Photon flux (15-150 keV)    in 1.28 sec: 0.308329 ( -0.108803  0.109418 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.20691e-08 ( -1.25218e-08  1.29748e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.000 sec. to    1.280 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.07787     (     )
Epeak [keV] : 29.3861      (   )
Norm@50keV  : 9.88973E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.15 using 59 PHA bins.
# Reduced chi-squared =         0.9491 for     56 degrees of freedom 
# Null hypothesis probability =   5.834194e-01
 
Photon flux (15-150 keV)    in 1.28 sec: 0.309056 ( -0.109361  0.108466 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.22673e-08 ( -1.30532e-08  1.26557e-08 ) ergs/cm2

Band function

Time interval is from    0.000 sec. to    1.280 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.10887   ( 1.10884   1.10884 )
beta        : -1.34458    ( 1.34467   0.700893 )
Epeak [keV] : 32.1388      ( -32.167 -32.167 )
Norm@50keV   : 4.92442E-03    ( -0.00492437   0.083019 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.19 using 59 PHA bins.
# Reduced chi-squared =         0.9672 for     55 degrees of freedom 
# Null hypothesis probability =   5.439196e-01
 
Photon flux (15-150 keV)    in 1.28 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 18.2917  (-7.6014  15.6522)
R^2/D10^2   : 1.77893E-02  (-0.017733   0.091278)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.94 using 59 PHA bins.
# Reduced chi-squared =         0.9814 for     57 degrees of freedom 
# Null hypothesis probability =   5.149398e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.517e-09   9.760e-10
25- 50  7.102e-09   4.490e-09
50-150  1.732e-08   1.208e-08
15-150  2.594e-08   1.711e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (-199.363      -199.363)
Norm        : 1.26652       (-0.441593     0.441593)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.66 using 59 PHA bins.
# Reduced chi-squared =         0.9414 for     57 degrees of freedom 
# Null hypothesis probability =   6.011453e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.037e-09   2.531e-09
25- 50  7.765e-09   4.924e-09
50-150  1.703e-08   1.097e-08
15-150  2.883e-08   1.872e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.96941        (-4.76013      7.37197)
R1^2/D10^2  : 1.11662        (-1.11003      4.32237)
kT2 [keV]   : 26.7951        (-26.7962      -26.7964)
R2^2/D10^2  : 4.56709E-03    (-0.00451639   0.0428675)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.11 using 59 PHA bins.
# Reduced chi-squared =         0.9656 for     55 degrees of freedom 
# Null hypothesis probability =   5.471523e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.093e-09   2.575e-09
25- 50  6.302e-09   3.309e-09
50-150  2.173e-08   1.354e-08
15-150  3.213e-08   1.789e-08

Peak spectrum fit

Power-law model

Time interval is from   -0.493 sec. to    0.507 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.17155     ( -0.559402   0.51346 )
Norm@50keV  : 3.53594E-03    ( -0.000995212   0.000994366 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.55 using 59 PHA bins.
# Reduced chi-squared =         0.7815 for     57 degrees of freedom 
# Null hypothesis probability =   8.849866e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.413465 ( -0.119949  0.120925 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.61691e-08 ( -1.11896e-08  1.14863e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.493 sec. to    0.507 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.17504     ( -0.568456   0.511264 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 3.54793E-03    ( -0.000999788   0.000999305 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.55 using 59 PHA bins.
# Reduced chi-squared =         0.7955 for     56 degrees of freedom 
# Null hypothesis probability =   8.647164e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.413877 ( -0.121697  0.119923 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.60727e-08 ( -1.23789e-08  1.14799e-08 ) ergs/cm2

Band function

Time interval is from   -0.493 sec. to    0.507 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.96613   ( -4.96613   -4.96613 )
beta        : -1.38840    ( -0.816786   0.654601 )
Epeak [keV] : 30.9664      ( -30.9664 51.9866 )
Norm@50keV   : 81.2691    ( -22.5376   1.53352e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.58 using 59 PHA bins.
# Reduced chi-squared =         0.7924 for     55 degrees of freedom 
# Null hypothesis probability =   8.664377e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 18.1300  (-6.25359  12.1011)
R^2/D10^2   : 2.54836E-02  (-0.0253747   0.0802352)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.90 using 59 PHA bins.
# Reduced chi-squared =         0.8403 for     57 degrees of freedom 
# Null hypothesis probability =   7.993996e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.673e-09   1.051e-09
25- 50  7.780e-09   4.699e-09
50-150  1.860e-08   1.215e-08
15-150  2.805e-08   1.756e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.362       (-106.961      -199.363)
Norm        : 1.71122       (-0.492551     0.492541)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.08 using 59 PHA bins.
# Reduced chi-squared =         0.8084 for     57 degrees of freedom 
# Null hypothesis probability =   8.492810e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.261e-09   2.618e-09
25- 50  8.197e-09   4.911e-09
50-150  1.798e-08   1.093e-08
15-150  3.044e-08   1.889e-08

Double BB

R1^2/D10^2  : 0.159484        (-0.137448      3.08223)
kT2 [keV]   : 94.7893        (-98.8923      -98.8924)
R2^2/D10^2  : 2.56491E-04    (-0.000215495   0.0227595)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.01 using 59 PHA bins.
#Fit statistic : Chi-Squared =          43.98 using 59 PHA bins.
#Fit statistic : Chi-Squared =          43.97 using 59 PHA bins.
# Reduced chi-squared =         0.8001 for     55 degrees of freedom 
# Reduced chi-squared =         0.7997 for     55 degrees of freedom 
# Reduced chi-squared =         0.7995 for     55 degrees of freedom 
# Null hypothesis probability =   8.560779e-01
# Null hypothesis probability =   8.566475e-01
# Null hypothesis probability =   8.569103e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.413e-09   2.231e-09
25- 50  8.083e-09   4.830e-09
50-150  2.609e-08   1.482e-08
15-150  3.759e-08   1.749e-08

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 7.32e-09
S(50-100 keV) = 1.15e-08

T90 vs. Hardness ratio plot

T90                                   = 0.816 sec.
Hardness ratio (energy fluence ratio) = 1.57104

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.41667
Count Ratio (50-100 keV) / (15-25 keV) = 1.25

Mask shadow pattern

IMX = -0.435917877684, IMY = -0.0180017920811

TIME vs. PHA plot around the beginning of event data (event_start to event_start+0.64s)

TIME vs. DetID plot around the beginning of event data (event_start to event_start+0.64s)

100 us light curve (15-350 keV; (event_start to event_start+0.64s)

Spacecraft aspect plot

Bright source in the event data image

Event data image of 15-350 keV band

Time interval of the image:
0.000000 1.280000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.0462 -15.5908    5.3  32.7  -19.7   0.0277   2.2    4.9	Sco X-1                       
255.9178 -37.7246    3.7  52.6    1.1   0.0970   3.1    7.9	4U 1700-377                   
256.4063 -36.4386    5.5  52.2   -0.5   0.0602   2.1    1.7	GX 349+2                      
263.0421 -24.8113   13.1  51.9  -16.9  -0.0243  -0.9    4.3	GX 1+4                        
270.3105 -25.0266    4.7  58.2  -19.2  -0.1499  -2.4    3.5	GX 5-1                        
270.3343 -25.7963    5.5  58.4  -18.4  -0.1304  -2.1    3.6	GRS 1758-258                  
263.1184 -33.8101    8.2  55.6   -6.7   0.0606   1.4    6.6	GX 354-0                      
172.8854  12.7254    2.0  44.4  149.9   0.1612   5.8 ------	UNKNOWN                       
230.0597 -39.4565    1.9  41.2   24.3   0.1231   6.1 ------	UNKNOWN                       
223.5013 -29.8788    2.0  30.4   27.7   0.0755   5.7 ------	UNKNOWN                       
198.9384  16.5487    2.5  23.6  177.7   0.0497   4.7 ------	UNKNOWN                       
262.3371   2.5089    2.4  46.7  -52.6   0.2164   4.7 ------	UNKNOWN

Webpage updated on:
Wed Nov 25 16:34:59 EST 2015