Gamma-ray Burst 130919A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 19 Sep 13 11:08:56 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     571271,   Seg_Num: 0
GRB_RA:          207.288d {+13h 49m 09s} (J2000),
                 207.470d {+13h 49m 53s} (current),
                 206.625d {+13h 46m 30s} (1950)
GRB_DEC:         -10.355d {-10d 21' 19"} (J2000),
                 -10.423d {-10d 25' 23"} (current),
                 -10.107d {-10d 06' 25"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=3361 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        16554 TJD;   262 DOY;   13/09/19
GRB_TIME:        40044.94 SOD {11:07:24.94} UT
GRB_PHI:         -97.58 [deg]
GRB_THETA:        18.86 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    14.90 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +3 -100  +0 -84  +0 
SUN_POSTN:       176.95d {+11h 47m 48s}   +1.32d {+01d 19' 18"}
SUN_DIST:         32.56 [deg]   Sun_angle= -2.0 [hr] (East of Sun)
MOON_POSTN:      355.47d {+23h 41m 52s}   +1.71d {+01d 42' 41"}
MOON_DIST:       147.04 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      325.34, 49.99 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      209.03,  0.83 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 35.86,-20.47 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 19 Sep 13 11:11:23 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     571271,   Seg_Num: 0
GRB_RA:          207.288d {+13h 49m 09s} (J2000),
                 207.470d {+13h 49m 53s} (current),
                 206.625d {+13h 46m 30s} (1950)
GRB_DEC:         -10.355d {-10d 21' 19"} (J2000),
                 -10.423d {-10d 25' 23"} (current),
                 -10.107d {-10d 06' 25"} (1950)
GRB_DATE:        16554 TJD;   262 DOY;   13/09/19
GRB_TIME:        40044.94 SOD {11:07:24.94} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -97.58 [deg]
GRB_THETA:        18.86 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    14.90 [sigma]
LC_URL:          sw00571271000msb.lc
SUN_POSTN:       176.95d {+11h 47m 48s}   +1.32d {+01d 19' 16"}
SUN_DIST:         32.56 [deg]   Sun_angle= -2.0 [hr] (East of Sun)
MOON_POSTN:      355.49d {+23h 41m 57s}   +1.72d {+01d 43' 09"}
MOON_DIST:       147.06 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      325.34, 49.99 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      209.03,  0.83 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is an image trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 35.86,-20.47 [deg].

GCN Circular #15232
H. A. Krimm (CRESST/GSFC/USRA), A. A. Breeveld (UCL-MSSL), D. N. Burrows (PSU), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), C. B. Markwardt (NASA/GSFC), A. Melandri (INAF-OAB), K. L. Page (U Leicester), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU) and T. N. Ukwatta (MSU) report on behalf of the Swift Team:
At 11:07:24 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130919A (trigger=571271). The BAT on-board calculated location is RA, Dec 207.288, -10.355 which is
```
   RA(J2000) = 13h 49m 09s
   Dec(J2000) = -10d 21' 19"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a broad peak of at least 60 seconds duration. This was an image trigger, so the currently available light curve does not show significant structure.
Due to a Sun observing constraint, Swift cannot slew to the BAT position until 23:23 UT on 2013 December 7. There will thus be no XRT or UVOT data for this trigger before this time.
Burst Advocate for this burst is H. A. Krimm (krimm AT milkyway.gsfc.nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #15234
A. Y. Lien (NASA/GSFC/ORAU), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130919A (trigger #571271) (Krimm, et al., GCN Circ. 15232). The BAT ground-calculated position is RA, Dec = 207.281, -10.353 deg which is
```
    RA(J2000)  =  13h 49m 07.5s
    Dec(J2000) = -10d 21' 11.0"
```
with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 77%.
The burst came into the BAT field of view at ~T-60 seconds, following a pre-planned slew and another slew took it out of the field at around T+215 seconds. mask-weighted light curve shows a broad peak from T-30 s to T+70 s, with at least six subpeaks superimposed. T90 (15-350 keV) is 97.3 +- 25.1 sec (estimated error including systematics).
The time-averaged spectrum from T-20.15 to T+108.07 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.54 +- 0.73, and Epeak of 71.7 +- 31.8 keV (chi squared 58.75 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T-6.49 sec in the 15-150 keV band is 0.5 +- 0.1 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.52 +- 0.14 (chi squared 65.60 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/571271/BA/
GCN Circular #15235
A. Trotter, D. Reichart, J. Haislip, A. LaCluyze, J. Moore, N. Frank, K. Ivarsen, M. Nysewander, A. Foster, T. Berger, H. T. Cromartie, R. Egger, M. Maples, and J. A. Crain report:
Skynet observed the Swift-BAT localization of GRB 130919A (Krimm et al., GCN 15232; Lien et al., GCN 15234, Swift trigger=571271) with three 16" telescopes of the PROMPT array at CTIO, Chile (V, R, and I bands).
Starting at 2013-09-19, 23:29 UT and continuing until 2013-09-20, 00:00 UT (t=12.40-12.93h post-trigger), Skynet took a total of 49 160s exposures, at high airmass >3. In stacked images, we do not detect any uncatalogued optical source in any band in or near the Swift-BAT error circles. The 3-sigma limiting magnitudes of our images are:
```
==================================
tmid    scope   expos   fil  limit
==================================
12.67h  Prompt5 12x160s  I  >19.44
12.55h  Prompt4  7x160s  R  >19.24
12.63m  Prompt1 10x160s  V  >19.54
==================================
```
Magnitudes are in the Vega System, calibrated to 8 APASS-DR7 stars in the field. Magnitudes have not been corrected for line-of-sight Milky Way dust extinction, with expected E(B-V)=0.057 (Schlegel et al. 1998).
No further Skynet observations are scheduled.

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Jochen Greiner, last update: 20-Sep-2013 [Disclaimer]