////////////////////////////////////////////////////////////////////////
TITLE:   GCN CIRCULAR
NUMBER:  12413
SUBJECT: GRB 111005A: Swift detection of a burst
DATE:    11/10/05 08:23:36 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott@milkyway.gsfc.nasa.gov>

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.)

////////////////////////////////////////////////////////////////////////
TITLE:   GCN CIRCULAR
NUMBER:  12414
SUBJECT: GRB 111005A: bright galaxy in error circle
DATE:    11/10/05 08:54:07 GMT
FROM:    Nial Tanvir at U.Leicester  <nrt3@star.le.ac.uk>

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.



////////////////////////////////////////////////////////////////////////
TITLE:   GCN CIRCULAR
NUMBER:  12415
SUBJECT: GRB 111005A: Swift-BAT refined analysis
DATE:    11/10/05 13:20:33 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>

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/

////////////////////////////////////////////////////////////////////////
TITLE:   GCN CIRCULAR
NUMBER:  12416
SUBJECT: GRB 111005A: VLT IR observations
DATE:    11/10/06 01:04:09 GMT
FROM:    Andrew Levan at U.of Leicester  <A.J.Levan@warwick.ac.uk>

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."


////////////////////////////////////////////////////////////////////////
TITLE:   GCN CIRCULAR
NUMBER:  12417
SUBJECT: GRB 111005A: GROND NIR observations
DATE:    11/10/06 08:43:20 GMT
FROM:    Jochen Greiner at MPI  <jcg@mpe.mpg.de>

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.

////////////////////////////////////////////////////////////////////////
TITLE:   GCN CIRCULAR
NUMBER:  12418
SUBJECT: GRB 111005A: VLT optical observations
DATE:    11/10/06 10:01:01 GMT
FROM:    Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst  <malesani@dark-cosmology.dk>

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.

////////////////////////////////////////////////////////////////////////
TITLE:   GCN CIRCULAR
NUMBER:  12419
SUBJECT: GRB 111005A:  EVLA Observations
DATE:    11/10/06 18:22:27 GMT
FROM:    Ashley Zauderer at CfA  <bevinashley@gmail.com>

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."

////////////////////////////////////////////////////////////////////////
TITLE:   GCN CIRCULAR
NUMBER:  12420
SUBJECT: GRB 111005A : miniTAO/ANIR NIR observations
DATE:    11/10/07 02:01:12 GMT
FROM:    Takeo Minezaki at U.of Tokyo/Astro  <minezaki@mtk.ioa.s.u-tokyo.ac.jp>

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).

////////////////////////////////////////////////////////////////////////
TITLE:   GCN CIRCULAR
NUMBER:  12421
SUBJECT: GRB 111005A: ATCA radio upper limit
DATE:    11/10/07 12:15:26 GMT
FROM:    Dong Xu at Weizmann Inst  <dong.dark@gmail.com>

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.

////////////////////////////////////////////////////////////////////////
TITLE:   GCN CIRCULAR
NUMBER:  12422
SUBJECT: GRB 111005A: ATCA 18 GHz detection
DATE:    11/10/08 20:20:14 GMT
FROM:    Dong Xu at Weizmann Inst  <dong.dark@gmail.com>

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.

////////////////////////////////////////////////////////////////////////
TITLE:   GCN CIRCULAR
NUMBER:  12435
SUBJECT: GRB 111005A: ATCA 18 GHz decay
DATE:    11/10/10 10:55:05 GMT
FROM:    Dong Xu at Weizmann Inst  <dong.dark@gmail.com>

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.