batgrbproduct analysis for trigger=362785

Analysis for Ground-detected GRB: Trigger=362785

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 Ver: batgrbproduct v2.46
    Process Start Time: Sun May 10 03:04:20 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
======================================================================

  Trigger: 00362785      Segment: 000

  BAT Trigger Time: 274721739.2
               UTC: 2009-09-15T15:35:34.112   [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: 237.991   Dec: 15.483  [deg; J2000]
 
  Refined Position:   [ source = BAT pre-slew image ]
    RA: 237.991   Dec: 15.483  [deg; J2000]
        { 15h 51m 57.8s , +15d 28' 58.8" }
        +/- 2.95711299957 [arcmin] (estimated 90% radius based on SNR)
    SNR: 6.46408025625
 
  Angular difference between the GCN position (ra=237.991, dec=15.483 deg) and this refined position is 0.000 arcmin
 
  Partial Coding Fraction: 0.08789062    [ including projection effects ]

  Duration
     T90: 9.60000002384186 +/- 1.6
        Measured from: 0
                   to: 9.6     [s; relative to TRIGTIME]
     T50: 6.40000003576279 +/- 1.6
        Measured from: 1.6
                   to: 8     [s; relative to TRIGTIME]
 
=== 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 6.51e-08 1.57e-07 3.01e-07 1.42e-06 8.16e-07 1.94e-06   erg/cm2
              Error 3.05e-08 4.53e-08 6.93e-08 7.36e-07 1.83e-07 7.61e-07   erg/cm2
Peak flux Power-law 2.81e-01 3.70e-01 3.59e-01 6.22e-01 1.22e+00 1.63e+00   ph/cm2/s
              Error 1.42e-01 1.18e-01 8.68e-02 3.11e-01 3.16e-01 3.91e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.75e-08 1.63e-07 3.75e-07 2.16e-07 7.28e-07 7.81e-07   erg/cm2
              Error 3.47e-08 6.06e-08 9.81e-08 4.69e-07 2.04e-07 4.80e-07   erg/cm2
Peak flux Cutoff-PL 9.27e-02 3.56e-01 4.73e-01 1.32e-01 1.03e+00 1.05e+00   ph/cm2/s
              Error 1.43e-01 1.71e-01 1.33e-01 2.16e-01 3.39e-01 3.95e-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    1.059    0.377    -      -           9.84e-03 2.29e-03   54.850 57
CPL  -1.677    3.996      80.8   65.2      1.27e-01 6.26e+00   50.580 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.044    0.400    -      -           1.05e-02 2.63e-03   55.860 57
CPL  -2.109    0.254      79.6   51.0      1.87e-01 5.69e+01   51.180 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    9.600    0.000    9.600
T90     9.600    0.000    9.600
T50     6.400    1.600    8.000
Peak    1.000    3.500    4.500

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
237.991 15.483 0.000 54.520 -28.267 1.046 6.464 TRIG_00362785
 
Image time interval: 0.000 to 7.824 [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    7.824 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.05874     ( -0.390199   0.364644 )
Norm@50keV  : 9.84124E-03    ( -0.00230339   0.00226739 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.85 using 59 PHA bins.
# Reduced chi-squared =         0.9624 for     57 degrees of freedom 
# Null hypothesis probability =   5.559899e-01
 
Photon flux (15-150 keV)    in 7.824 sec: 1.13725 ( -0.271988  0.278961 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.15949e-07 ( -1.82948e-07  1.83913e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.000 sec. to    7.824 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.67730     ( -5.63126   2.35988 )
Epeak [keV] : 80.8328      ( -17.1005 113.328 )
Norm@50keV  : 0.127299    ( -0.130554   12.3862 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.58 using 59 PHA bins.
# Reduced chi-squared =         0.9032 for     56 degrees of freedom 
# Null hypothesis probability =   6.794501e-01
 
Photon flux (15-150 keV)    in 7.824 sec: 0.986668 ( -0.291131  0.302212 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.2764e-07 ( -2.01488e-07  2.05904e-07 ) ergs/cm2

Band function

Time interval is from    0.000 sec. to    7.824 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 1.94480   ( -2.56638   -1.9923 )
beta        : -2.71359    ( 2.71971   1.53255 )
Epeak [keV] : 76.9958      ( -29.3363 96.6907 )
Norm@50keV   : 0.172814    ( -0.111452   1.87296 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.34 using 59 PHA bins.
# Reduced chi-squared =         0.9152 for     55 degrees of freedom 
# Null hypothesis probability =   6.531078e-01
 
Photon flux (15-150 keV)    in 7.824 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]    : 21.0132  (-4.15362  6.00617)
R^2/D10^2   : 4.88665E-02  (-0.0277078   0.0535594)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.59 using 59 PHA bins.
# Reduced chi-squared =         0.8875 for     57 degrees of freedom 
# Null hypothesis probability =   7.128725e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.189e-08   1.528e-08
25- 50  1.640e-07   6.476e-08
50-150  5.396e-07   2.448e-07
15-150  7.355e-07   2.757e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-65.5324      -200)
Norm        : 4.98156       (-1.1393     1.1393)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.20 using 59 PHA bins.
# Reduced chi-squared =          1.039 for     57 degrees of freedom 
# Null hypothesis probability =   3.951721e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.715e-08   5.758e-08
25- 50  1.869e-07   1.109e-07
50-150  4.099e-07   2.357e-07
15-150  6.939e-07   4.010e-07

Double BB

R1^2/D10^2  : 3.09086E-05        (-3.09099e-05      -3.09099e-05)
kT2 [keV]   : 19.9077        (-5.81158      6.9957)
R2^2/D10^2  : 5.51447E-02    (-0.0336895   0.0461766)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.59 using 59 PHA bins.
#Fit statistic : Chi-Squared =          50.52 using 59 PHA bins.
#Fit statistic : Chi-Squared =          50.50 using 59 PHA bins.
# Reduced chi-squared =         0.9197 for     55 degrees of freedom 
# Reduced chi-squared =         0.9186 for     55 degrees of freedom 
# Reduced chi-squared =         0.9182 for     55 degrees of freedom 
# Null hypothesis probability =   6.438054e-01
# Null hypothesis probability =   6.462332e-01
# Null hypothesis probability =   6.468814e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  0.000e+00   0.000e+00
25- 50  0.000e+00   0.000e+00
50-150  0.000e+00   0.000e+00
15-150  0.000e+00   0.000e+00

Peak spectrum fit

Power-law model

Time interval is from    1.888 sec. to    7.824 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.04423     ( -0.414573   0.386283 )
Norm@50keV  : 1.05292E-02    ( -0.00265606   0.00261182 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.86 using 59 PHA bins.
# Reduced chi-squared =         0.9799 for     57 degrees of freedom 
# Null hypothesis probability =   5.180931e-01
 
Photon flux (15-150 keV)    in 5.936 sec: 1.21538 ( -0.311446  0.319963 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.6558e-07 ( -1.59928e-07  1.60704e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.888 sec. to    7.824 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.10914     ( 2.17699   2.68487 )
Epeak [keV] : 79.5908      ( -15.8403 86.1219 )
Norm@50keV  : 0.187406    ( -0.206671   113.646 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.18 using 59 PHA bins.
# Reduced chi-squared =         0.9139 for     56 degrees of freedom 
# Null hypothesis probability =   6.576743e-01
 
Photon flux (15-150 keV)    in 5.936 sec: 1.03453 ( -0.332466  0.34594 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.90041e-07 ( -1.76307e-07  1.79099e-07 ) ergs/cm2

Band function

Time interval is from    1.888 sec. to    7.824 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.66713   ( -9.26513   -4.66713 )
beta        : -3.13102    ( 3.13102   1.63195 )
Epeak [keV] : 70.7983      ( -33.8399 26.9126 )
Norm@50keV   : 1.70192    ( -0.383513   79.4303 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.29 using 59 PHA bins.
# Reduced chi-squared =         0.9326 for     55 degrees of freedom 
# Null hypothesis probability =   6.171446e-01
 
Photon flux (15-150 keV)    in 5.936 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]    : 21.3267  (-4.37597  6.43307)
R^2/D10^2   : 5.05698E-02  (-0.0295199   0.0585265)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.28 using 59 PHA bins.
# Reduced chi-squared =         0.8996 for     57 degrees of freedom 
# Null hypothesis probability =   6.885882e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.562e-08   1.218e-08
25- 50  1.330e-07   6.234e-08
50-150  4.513e-07   2.092e-07
15-150  6.099e-07   2.805e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-69.667      -200)
Norm        : 5.32452       (-1.31236     1.31236)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.95 using 59 PHA bins.
# Reduced chi-squared =          1.052 for     57 degrees of freedom 
# Null hypothesis probability =   3.692967e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.871e-08   4.749e-08
25- 50  1.514e-07   8.747e-08
50-150  3.320e-07   1.949e-07
15-150  5.622e-07   3.268e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 0.204090        (-0.20409      -0.20409)
R1^2/D10^2  : 6.58248E-02        (-0.0658248      -0.0658248)
kT2 [keV]   : 21.3268        (-4.37598      6.43306)
R2^2/D10^2  : 5.05697E-02    (-0.0295199   0.0585266)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.28 using 59 PHA bins.
# Reduced chi-squared =         0.9323 for     55 degrees of freedom 
# Null hypothesis probability =   6.175821e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  0.000e+00   0.000e+00
25- 50  0.000e+00   0.000e+00
50-150  0.000e+00   0.000e+00
15-150  0.000e+00   0.000e+00

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

S(25-50 keV)  = 1.57e-07
S(50-100 keV) = 3.01e-07

T90 vs. Hardness ratio plot

T90                                   = 9.60000002384186 sec.
Hardness ratio (energy fluence ratio) = 1.9172

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 2.86408
Count Ratio (50-100 keV) / (15-25 keV) = 4.16505

Mask shadow pattern

IMX = 1.23569112544, IMY = 0.664425214753

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:
1.888000 7.823800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9701 -15.6278    1.5  25.8  -51.1   0.2957   7.7    0.9	Sco X-1                       
255.8780 -37.6995    6.6  11.9 -120.2  -0.0566  -1.7   10.1	4U 1700-377                   
256.5822 -36.4424    8.3  10.8 -116.0   0.0444   1.4    7.2	GX 349+2                      
262.9847 -24.5973   16.0   7.6  -27.1   0.0222   0.7    9.0	GX 1+4                        
264.9101 -44.5555    6.0  13.8 -163.8  -0.0588  -1.9    9.6	4U 1735-44                    
268.3495  -1.4661    5.6  29.5    8.9   0.0792   2.0    1.4	SW J1753.5-0127               
270.4445 -25.0417    5.1   6.4   30.4   0.0705   2.3    9.0	GX 5-1                        
270.1264 -25.6966    7.5   5.6   30.1   0.0480   1.5    9.9	GRS 1758-258                  
274.1227 -13.8683    0.0  18.0   28.1   0.0469   1.5   12.2	GX 17+2                       
276.0595 -30.1904    0.0   7.2   93.9   0.0477   1.5   12.7	H1820-303                     
285.0935 -24.8525    3.3  16.5   80.3   0.1264   3.5    5.1	HT1900.1-2455                 
288.8903  10.9199    7.2  46.5   36.9   0.1748   1.6    5.6	GRS 1915+105                  
262.9842 -33.9852    5.1   5.0 -120.8   0.0659   2.2    9.0	GX 354-0                      
279.2708 -65.1665    2.6  35.0  179.3   0.1887   4.4 ------	UNKNOWN                       
234.0497 -54.5511    2.0  33.6 -136.8   0.2544   5.7 ------	UNKNOWN                       
238.4227 -30.2314    2.7  25.2  -88.3   0.1880   4.3 ------	UNKNOWN                       
237.9899  15.4815    1.9  54.5  -28.3   0.8805   6.2 ------	UNKNOWN

Webpage updated on:
Wed Nov 25 14:11:02 EST 2015