Gamma-ray Burst 111005A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Oct 11 08:12:18 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     504779,   Seg_Num: 0
GRB_RA:          223.284d {+14h 53m 08s} (J2000),
                 223.451d {+14h 53m 48s} (current),
                 222.576d {+14h 50m 18s} (1950)
GRB_DEC:         -19.730d {-19d 43' 48"} (J2000),
                 -19.778d {-19d 46' 40"} (current),
                 -19.527d {-19d 31' 35"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       44833 [cnts]    Image_Peak=520 [image_cnts]
TRIGGER_DUR:     8.192 [sec] 
TRIGGER_INDEX:   327     E_range: 15-50 keV
BKG_INTEN:       336630 [cnts]
BKG_TIME:        29024.56 SOD {08:03:44.56} UT
BKG_DUR:         64 [sec]
GRB_DATE:        15839 TJD;   278 DOY;   11/10/05
GRB_TIME:        29114.22 SOD {08:05:14.22} UT
GRB_PHI:         -43.57 [deg]
GRB_THETA:        38.17 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.00 [sigma]
IMAGE_SIGNIF:    7.29 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +1  -3 -100  +0 -81  +0 
SUN_POSTN:       190.80d {+12h 43m 12s}   -4.64d {-04d 38' 36"}
SUN_DIST:         35.20 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      297.75d {+19h 51m 00s}  -17.73d {-17d 44' 03"}
MOON_DIST:        69.78 [deg]
MOON_ILLUM:      63 [%]
GAL_COORDS:      338.34, 34.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      226.67, -3.04 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
COMMENTS:        This is a rate 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 = 12.83,-13.64 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Oct 11 08:12:48 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     504779,   Seg_Num: 0
GRB_RA:          223.284d {+14h 53m 08s} (J2000),
                 223.451d {+14h 53m 48s} (current),
                 222.576d {+14h 50m 18s} (1950)
GRB_DEC:         -19.730d {-19d 43' 48"} (J2000),
                 -19.778d {-19d 46' 40"} (current),
                 -19.527d {-19d 31' 35"} (1950)
GRB_DATE:        15839 TJD;   278 DOY;   11/10/05
GRB_TIME:        29114.22 SOD {08:05:14.22} UT
TRIGGER_INDEX:   327
GRB_PHI:         -43.57 [deg]
GRB_THETA:        38.17 [deg]
DELTA_TIME:      -5.00 [sec]
TRIGGER_DUR:     8.192 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.00 [sigma]
IMAGE_SIGNIF:    7.29 [sigma]
LC_URL:          sw00504779000msb.lc
SUN_POSTN:       190.80d {+12h 43m 12s}   -4.64d {-04d 38' 37"}
SUN_DIST:         35.20 [deg]   Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN:      297.75d {+19h 51m 01s}  -17.73d {-17d 43' 58"}
MOON_DIST:        69.78 [deg]
MOON_ILLUM:      63 [%]
GAL_COORDS:      338.34, 34.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      226.67, -3.04 [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 a rate 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 = 12.83,-13.64 [deg].

GCN Circular #12413
C. J. Saxton (UCL-MSSL), S. D. Barthelmy (GSFC), V. D'Elia (ASDC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Guidorzi (U Ferrara), J. A. Kennea (PSU), O. M. Littlejohns (U Leicester), S. R. Oates (UCL-MSSL), K. L. Page (U Leicester), D. M. Palmer (LANL), P. Romano (INAF-IASFPA) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift Team:
At 08:05:14 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 111005A (trigger=504779). Swift did not slew because of a Sun observing constraint. The BAT on-board calculated location is RA, Dec 223.284, -19.730 which is
```
   RA(J2000)  =  14h 53m 08s
   Dec(J2000) = -19d 43' 48"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about 20 sec. The peak count rate was ~1900 counts/sec (15-350 keV), at ~1 sec after the trigger.
Due to a Sun observing constraint, Swift cannot slew to the BAT position until 18:03 UT on 2011 December 25. There will thus be no XRT or UVOT data for this trigger before this time.
Burst Advocate for this burst is C. J. Saxton (cjs2 AT mssl.ucl.ac.uk). 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 #12414
A.J. Levan (U. Warwick), N.R. Tanvir, K. Wiersema, P.T. O'Brien (U. Leicester), comment:
We note that the BAT error circle of GRB 111005A (Saxton et al. GCN 12413) contains the bright, nearby galaxy ESO 580-49, at a redshift 0.01326 (~55 Mpc). If associated with GRB 111005A this would make it the closest GRB identified since GRB980425/SN1998bw. Although the burst is extremely close to the sun any follow-up observations are strongly encouraged.
GCN Circular #12415
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), C. J. Saxton (UCL-MSSL) M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 111005A (trigger #504779) (Saxton, et al., GCN Circ. 12413). The BAT ground-calculated position is RA, Dec = 223.315, -19.722 deg, which is
```
   RA(J2000)  =  14h 53m 15.6s 
   Dec(J2000) = -19d 43' 19.1" 
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 42%.
The mask-weighted light curve shows a single peak starting roughly at T-20 sec, peaking at ~T+1 sec, and ending at ~T+40 sec. T90 (15-350 keV) is 26 +- 7 sec (estimated error including systematics).
The time-averaged spectrum from T-5.23 to T+23.06 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.03 +- 0.27. The fluence in the 15-150 keV band is 6.2 +- 1.1 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.70 sec in the 15-150 keV band is 1.1 +- 0.3 ph/cm2/sec. 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/504779/BA/
GCN Circular #12416
A.J. Levan (Warwick), D. Malesani, J. Hjorth (DARK/NBI), N.R. Tanvir, K. Wiersema (U. Leicester) report for a larger collaboration:
We observed the location of GRB 111005A (Saxton et al. GCN 12413) with the VLT and the HAWKI IR instrument. Images were taken in twilight and with a high airmass, and began at 23:27 UT. We do not identify any new sources in or around the z=0.013 galaxy ESO 580-49 (Levan et al. GCN 12414) in comparison with archival 2MASS images (limiting magnitude approximately K~16). There are several fainter sources lying on the field of the galaxy, but further observations will be necessary to establish if any of these is variable, and hence a plausible counterpart for GRB 111005A.
We thank the ESO directorate for the rapid approval of these observations, and the VLT staff, in particular Christophe Martayan and Retha Pretorius for their assistance with these challenging observations."
GCN Circular #12417
M. Nardini (Uni. Milano-Bicocca), J. Greiner (MPE Garching) and T. Kruehler (DARK), report on behalf of the GROND team:
We observed the field of the GRB 111905A (Saxton et al., GCN 12413) starting 2011 October 5 at 23:25 UT (15.3hr post trigger) simultaneously in JHKs with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPI/ESO telescope at La Silla Observatory (Chile). Observations were performed during twilight (with the Sun just 10 deg below the horizon) before the target was going to set, at an average airmass of 2.5 and seeing of 2".
With an exposure time of 240s seconds in JHKs we do not identify any new source within the BAT error circle (Barthelmy et al., GCN 12415) relative to 2MASS.
In particular, we do not find any new point source within or near the galaxy ESO 580-49 mentioned by Levan et al. (GCN 12414).
Our 3 sigma limiting magntiudes (AB system) are:
```
J  < 19.8
H  < 19.3
Ks < 18.7
```
while the limits for an afterglow brighter than the corresponding 2MASS limits (transformed to AB mag) are
```
J < 16.7, 
H < 16.5 and 
Ks< 16.0 mag
```
in agreement with Levan et al. (GCN 12416).
The given GROND magnitudes are calibrated against 2MASS field stars.
GCN Circular #12418
D. Malesani (DARK/NBI), A.J. Levan (Univ. Warwick), N.R. Tanvir, K. Wiersema (Univ. Leicester), J. Hjorth, J. P. U. Fynbo (DARK/NBI), report on behalf of a larger collaboration.
We observed the surroundings of the galaxy ESO 580- G 049, which is overlapping the BAT error circle of GRB 111005A (Saxton et al., GCN 12413; Barthelmy et al., GCN 12415; Levan et al., GCN 12414). Observations were carried out with the acquisition camera of the X-shooter spectrograph mounted on the ESO VLT. Images were taken in the z and I bands, and were carried out deep in twilight. We note that our data only cover a small fraction of the BAT error circle. The time of the observation is October 5, 23:40 UT (i.e., 15.6 hr after the GRB), and the exposure time was 30 s in both z and I.
Our data reach somewhat deeper than the DSS survey; our limiting magnitude is I ~ 20.5 (assuming I = 16.3 for the star at RA = 14:53:07.299, Dec = -19:43:43.63). No new sources can be recognized in comparison to the DSS survey, in agreement with previous reports (Levan et al., GCN 12416; Nardini et al., GCN 12417). A few objects (fainter than the DSS limit) can be seen consistent with the galaxy disk, although their association with the GRB cannot be ascertained at this stage.
We acknowledge the excellent support of the ESO staff at Paranal in scheduling and executing such a challenging observation, in particular Christophe Martayan and Maja Vuckovic.
GCN Circular #12419
A. Zauderer, E. Berger, A. M. Soderberg (Harvard), and D. A. Frail (NRAO) report:
"We observed the BAT error circle of GRB 111005A (GCN #12415) with the EVLA on 2011 October 5.98 UT (15.4 hours after the burst) at a frequency of 5 GHz. We detect two sources within the error circle at the following coordinates (J2000):
```
EVLA-S1:
RA = 14:53:07.78
DEC = -19:44:12.2

EVLA-S2:
RA 14:53:11.64
DEC -19:43:30.8
```
EVLA-S1 coincides with the disk of the z=0.01326 galaxy ESO 580-49 (Levan et al. GCN #12414), and is located about 2.5 arcsec from its bulge. It is therefore a possible counterpart of GRB 111005A. EVLA-S2 is detected in the NVSS survey with a 1.4 GHz flux density of 5.7 mJy and is thus unlikely to be related to GRB 111005A.
Additional observations to check for variability of EVLA-S1 are in progress."
GCN Circular #12420
K. Motohara, M. Konishi, T. Tanabe, T. Kamizuka, K. Tateuchi, T. Minezaki, and Y. Yoshii (University of Tokyo), report on behalf of the TAO project team
We observed the field of GRB 111005A (Saxton et al., GCN 12413) in Ks and J with the near-infrared camera ANIR mounted on the miniTAO 1.0m telescope at the University of Tokyo Atacama Observatory, located on the summit of Co. Chajnantor (5640m altitude) in the northern Chile.
Observations started just after the sunset, at 22:59 UT in Ks and at 23:17 UT in J, approximately 15 hours after the burst. Exposure time is 720sec in Ks and 600sec in J, which result in the 5 sigma limiting magnitude (AB system) of J < 19.4 and Ks < 19.1 (3" aperture). All the magnitudes are calibrated against the 2MASS field stars. The final seeing size is 1.2" in Ks and 1.5" in J.
We find no new sources compared to the 2MASS catalog, consistent with the report by Levan et al. (GCN 12416) and Nardini et al. (GCN 12417). In addition, no point source is detected at the position of the 5GHz source EVLA-S1 (Zauderer et al., GCN 12419).
GCN Circular #12421
D. Xu (WIS), M. Michalowski (U. Edinburgh), J. Stevens, P. Edwards, D. Bock, B. Hiscock, R. Wark (CSIRO) report on behalf of a larger collaboration:
We observed the BAT field of GRB 111005A (Saxton et al., GCN 12413) with the Australia Telescope Compact Array (ATCA), starting at 05:13 UT, 7th Oct. 2011 (i.e., 45.1 hours after the burst) at frequencies of 5.5/9 GHz.
The source of NVSS 145310-194331, or EVLA-S2 by Zauderer et al. (GCN 12419), in the field was clearly detected in our 5.5GHz image. But no radio source was detected near or in the local galaxy, ESO 580-49 at z=0.013 (Levan et al., GCN 12414), to a 3sigma upper limit of ~114 microJy at 5.5GHz.
Comparison with the earlier detection of a radio transient, EVLA-S1, in the galaxy (GCN 12419; and typical EVLA 3sigma upper limit of ~60-100 microJy from previous GRB events) reveals that probably this radio transient has been decaying over the past ~2 days.
Further ATCA observations of the field are underway.
GCN Circular #12422
M. Michalowski (U. Edinburgh), D. Xu (WIS), J. Stevens, P. Edwards, D. Bock, B. Hiscock, R. Wark (CSIRO) report:
We continued to observe the BAT field of GRB 111005A (Saxton et al., GCN 12413) with the Australia Telescope Compact Array (ATCA), starting at 07:04 UT, 8th Oct. 2011 (i.e., 71 hours after the burst) at the frequency of 18 GHz.
We detected a radio source with the coordinates
```
RA(J2000) = 14:53:07.74
Dec(J2000) = -19:44:08.9
```
coincident with the disk of the local galaxy ESO 580-49 at z=0.013 (M_B ~ -18.6 mag).
Together with our earlier upper limit at this position at 5.5 GHz (Xu et al., GCN 12421), it would be difficult to ascribe the 18 GHz detection to the contribution of the ESO 580-49 galaxy itself as this would require the galaxy spectrum to fall with decreasing radio frequency. Hence, we suggest the above source to be the radio afterglow of GRB 111005A and thus an associated supernova is expected.
Our 18 GHz position is ~3.4 arcsec away from the 5 GHz source EVLA-S1 reported by Zauderer et al., (GCN 12419), well within the positional uncertainties of the ATCA observation.
Further observations are planned.
GCN Circular #12435
D. Xu (WIS), M. Michalowski (U. Edinburgh), J. Stevens, P. Edwards (CSIRO) report:
GRB 111005A (Saxton et al., GCN 12413) was observed with the Australia Telescope Compact Array (ATCA), starting at 02:43 UT, 10th Oct. 2011 (i.e., 4.8 days after the burst) at the frequencies of 18, 34 and 94 GHz. Compared with our earlier detection (Michalowski et al., GCN 12422) the afterglow has decayed by 0.5 mJy at 18 GHz.

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Jochen Greiner, last update: 10-Oct-2011 [Disclaimer]