GRB 051105A
GCN Circular 4242
Subject
GRB 051105a: GETS optical limit
Date
2005-11-10T08:40:38Z (20 years ago)
From
Kenzo Kinugasa at Gunma Astro. Obs/Japan <kinugasa@astron.pref.gunma.jp>
K. Kinugasa (Gunma Astronomical Observatory) and K. Torii (Osaka U.) report:
The error region of the short GRB 051105a (Mineo, et al. GCN 4188)
was imaged by the robotic 0.25m GETS telescope in the Gunma
Astronomical Observatory. Unfiltered imaging started at 09:25:04 UT
(3.0 hours after the trigger) and 30 s integration was repeated.
We do not identify a new object within the BAT error region (GCN 4188)
and the following upper limits are derived relative to USNO-A1.0 R mag.
------------------------------------------
StartUT Limit Nframes
------------------------------------------
09:31:16 >18.3 52
10:07:51 >18.0 96
------------------------------------------
GCN Circular 4204
Subject
GRB 051105a, observation from Naini Tal and OSN
Date
2005-11-06T23:19:18Z (20 years ago)
From
Martin Jelinek at Inst.Astrophys.Andalucia,Granada <mates@iaa.es>
Antonio de Ugarte Postigo, Shashi B. Pandey, Martin Jel����nek,
Alberto J. Castro-Tirado, Victor Casanova, Javier Gorosabel
and Sergey Guziy (IAA-CSIC, Granada, Spain),
Kuntal Mishra and Atish Kamble (ARIES NainiTal, India)
report:
"We have observed the field of GRB 051105a (Cummings et al.,
GCN 4190, Barbier et al., GCN 4194) with 1.0m Nainital
telescope starting 8 hours after the GRB in the R-band
(4x5min) and with 1.5m OSN starting 12 and 36 hours after the
GRB in R (10x5min) and I (10x5min) bands.
We inspected the complete BAT errorbox (Barbier et al., GCN
4194) and we do not detect any significantly decaying object.
Particularly we do not detect any variation among the three
sources reported by Klose et al. (GCN 4196) or of the optical
counterpart (Piranomonte et al., GCN 4201) of the radio source
reported by Frail et al. (GCN 4199)����
This message may be cited.
GCN Circular 4203
Subject
GRB 051105A, 2nd epoch optical observations
Date
2005-11-06T17:55:59Z (20 years ago)
From
Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>
S. Klose, P. Ferrero, D. A. Kann, U. Laux, and B. Stecklum,
Thueringer Landessternwarte Tautenburg,
report:
Using the Tautenburg 1.34-m Schmidt telescope we have performed a 2nd
epoch observation of the error circle of GRB 051105A (Cummings et
al. 2005; Barbier et al. 2005, GCN 4194) starting on Oct 06, 17:30 UT,
i.e. about 34 hrs after the burst.
A comparison of the combined 2nd epoch image (9x5 min, R band) with
the combined image obtained during the first observing run (Klose et
al. 2005, GCN 4196) shows no obvious afterglow candidate in the error
circle of the XRT source S1 (Mineo et al. 2005, GCN 4195). The faint
R-band source which was reported in GCN 4196 has not disappeared and
shows no obvious evidence for a fading. Assuming for simplicity a
power-law decay slope of alpha = 1.0, we would expect that if this
were the afterglow it would have faded below our detection limit.
This message my be quoted.
GCN Circular 4202
Subject
GRB 051105a: MDM Observations
Date
2005-11-06T05:04:24Z (20 years ago)
From
Jules Halpern at Columbia U. <jules@astro.columbia.edu>
J. P. Halpern, S. Tonnesen, S. Tuttle (Columbia U.), and N. Mirabal
(U. Michigan) report on behalf of the MDM Observatory GRB follow-up team:
"We observed the location of Swift GRB 051105a (Mineo et al., GCN #4188)
using the MDM 2.4m telescope, with a 4.6x4.6 arcminute field centered
on the improved BAT position (Barbier et al., GCN #4194). A total of
2 and 30 minutes exposure were obtained in the Gunn g and r filters,
respectively. The mean epoch of the observations was Nov. 6 02:39 UT,
or 20 hours after the burst. The following R magnitudes of objects
mentioned in previous GCN circulars were measured, referenced to the
comparison star magnitude R=17.0 used by Piranomonte et al. (GCN #4201):
---------------------------------------------------------------------------
R.A. (J2000) Decl. (J2000) R(mag) ID GCN ref
---------------------------------------------------------------------------
17 41 10.00 +34 55 45.2 21.15 +/- 0.03 inside XRT S1 4195,4196,4201
17 41 10.28 +34 55 41.1 22.50 +/- 0.12 outside XRT S1 4196,4201
17 41 03.28 +34 59 03.6 23.24 +/- 0.22 radio 4199
---------------------------------------------------------------------------
Positional uncertainties are 0.3" in the USNO B1.0 reference system, except
for the faint object that is, nevertheless, consistent in position with the
radio source of Frail & Cameron (GCN #4199). The bright object in the error
circle of XRT S1 is clearly blue in g-r, as well as on the Palomar Sky Survey
plates, and might therefore be an X-ray detected QSO. Our magnitude of it
is consistent with that measured by Piranomonte et al. (GCN #4201) 7 hours
earlier."
GCN Circular 4201
Subject
GRB 051105A: TNG optical observations
Date
2005-11-06T01:35:56Z (20 years ago)
From
Stefano Covino at Brera Astronomical Observatory <covino@merate.mi.astro.it>
S. Piranomonte (INAF/OAR), S. Covino (INAF/OAB), A. Antonelli (INAF/OAR), D. Malesani (SISSA), T. Mineo (INAF/IASFPA), G. Tagliaferri (INAF/OAB), A. Magazzu' (INAF/TNG), N. Pinilla-Alonso (INAF/TNG) on behalf of the CIBO collaboration report:
We observed the field of GRB 051105A (Mineo et al., GCN 4188; Cummings et al., GCN 4190) with the TNG equipped with DOLORES on October 05 from 19:41 UT to 20:41 UT (more than 13 hours after the burst) in the R band.
Preliminary analysis shows that inside the XRT SR1 (Mineo et al., GCN 4195) error circle one only object at coordinates (J2000) RA, DEC = 17:41:09.95, 34:55:44.5 (error +/- 1 arcsec) is visible. The object magnitude is R=21.19 +/- 0.03 assuming R=17.0 for the star U1200_08571196 at coordinates RA,DEC = 17:41:14.05, 34:55:35.1. This object is also present in the USNO catalogue.
One more fainter source is located just outside the error circle at coordinates RA: 17:41:10.25 and DEC: 34:55:39.9. These two sources are probably the same detected by Klose et al. (GCN 4196).
Moreover, a very faint source, close to our detection limit, might also be present at the position of the radio source reported by Frail et al. (GCN 4199).
We acknowledge the support received from the TNG staff.
Further observations are planned.
This message may be cited.
GCN Circular 4200
Subject
GRB051105A: Swift/UVOT Observations
Date
2005-11-06T00:29:13Z (20 years ago)
From
Peter Brown at PSU <pbrown@astro.psu.edu>
P.J. Brown (PSU), T. Mineo (INAF-IASFPA), M. Chester (PSU),
L. Angelini (GSFC-JHU), P. Meszaros (PSU), & N. Gehrels (GSFC)
on behalf of the Swift/UVOT team report:
The Swift-UVOT began observing the field of
GRB 051105A (BAT Trigger=162580; Mineo et al. GCN 4188)
at 2005-11-05 6:27:47, 66 seconds after the burst.
No new source with respect to the DSS is visible in the
2.5' revised BAT error circle (Barbier et al. GCN 4194)
during the first 200 second image (Tmid=166 seconds
after the burst) down to a 5 sigma
limiting magnitude of V=18.4. Using summed images,
we also do not detect a new source in any of our 6 filters
down to the following 5-sigma magnitude upper limits:
Filter T_range(sec) Exp(sec) 5sigUL
V 66-19067 2198 20.0
B 433-13687 961 20.6
U 379-25257 1345 20.5
W1 325-25103 2098 20.0
M2 271-24196 2303 20.4
W2 542-18160 2042 20.4
White 487-915 100 19.4
Where T_range is time post-trigger.
At the position of XRT's SR1 (Mineo et al. GCN 4195), we marginally detect the
brighter source (with counterpart in DSS) seen by Klose, Laux, & Stecklum (GCN
4196) but not the fainter source.
We also detect the extended galaxy mentioned by Klose, Laux, & Stecklum (GCN
4196) to the east of SR1 in the optical filters and derive the following
magnitudes and 3 sigma upper limits: V=19 +/- 0.1, B=20.4 +/- 0.2, U=20.5 +/-
0.2, UVW1>20.6, UVM2>21.0, UVW2>21.0. The non-detection of the galaxy in the
UV is not necessarily due to redshift, as the limits are not that deep, but
might indicate that there is not a high star formation rate in this galaxy.
XRT positions SR2,3,4 (Mineo et al. GCN 4195) each contain an optical
counterpart (visible in the DSS) within the north edge of the error circle.
They are outside the revised BAT error circle as mentioned by Klose, Laux, &
Stecklum (GCN 4196).
We do not detect a source at the position of the radio source detected by Frail
& Cameron (GCN 4199).
Further observations and analysis are underway.
GCN Circular 4199
Subject
GRB 051105A, radio observations
Date
2005-11-06T00:07:00Z (20 years ago)
From
Dale A. Frail at NRAO <dfrail@nrao.edu>
D. A. Frail (NRAO) and P. B. Cameron (Caltech) report on behalf of a
larger collaboration:
"We observed the field of GRB 051105A (GCN 4188; GCN 4194) with the
Very Large Array at 8.5 GHz beginning November 5.80 UT. Within the
�2.5 arcmin BAT error radius we find one radio source in excess of
5-sigma with a flux density of 190 � 17 uJy at RA(J2000)=17 41 3.19
DEC(J2000) = +34 59 04.1, with (conservative) astrometric errors of
order 1 arcsec.
There are no radio sources at the positions of the four XRT sources
listed in GCN 4195.
Given the relatively large size of the BAT error circle, and the lack
of any flux variations we cannot determine whether this radio source
is related to GRB 051105A. Further observations are planned.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation operated under cooperative agreement by Associated
Universities, Inc."
[GCN OPS NOTE(10dec06): The burst name in the Subject-line was changed
from "051005A" to "051105A" to agree with the contents of the Circular.]
GCN Circular 4196
Subject
GRB 051105A, optical observations
Date
2005-11-05T18:19:45Z (20 years ago)
From
Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>
S. Klose, U. Laux, and B. Stecklum, Thueringer Landessternwarte
Tautenburg,
report:
Tautenburg started observing the error circle of GRB 051105A (Cummings
et al. 2005) on Oct 05, 16:37 UT, i.e. about 10 hrs after the burst.
Among the XRT sources reported in GCN 4195 (Mineo et al. 2005), only
source S1 lies within the r=2.5 arcmin GRB error circle (Barbier
et al. 2005, GCN 4194). This source is close to a galaxy. Since we
can resolve this galaxy its redshift might be less than 0.5.
A first inspection of the combined R-band image (9x5 min) shows two
sources in the 6.5 arcsec error circle (S1). The brighter one at RA,
DEC (J2000) = 17:41:10.05, 34:55:43.5 (+/- 1 arcsec, is barely visible on
the DSS2, the fainter one, at RA, DEC = 17:41:10.21, 34:55:41.4 (+/- 1
arcsec), is beyond the limiting magnitude of the DSS2.
Observations are ongoing.
This message my be quoted.
GCN Circular 4195
Subject
XRT observations of GRB 051105A
Date
2005-11-05T17:29:37Z (20 years ago)
From
Gianpiero Tagliaferri at OAB-INAF <taglia@merate.mi.astro.it>
T.Mineo (INAF-IASFPA), G.Tagliaferri(INAF-OAB),
D.Malesani(SISSA), P.Giommi (ASDC), D.Burrows(PSU), D. Fox (PSU)
G.Chincarini(INAF-OAB and UNIMIB), and K. Page (U. Leicester)
on behalf of the Swift XRT team
The Swift XRT has observed the field of the BAT short burst
GRB051105A (trigger=162580; GCN 4188, Mineo et al.) for 8.6 ks.
There are four sources present in the field close to BAT refined
error box (Barbier et al. GCN 4194):
SR1 at RA= 17h 41m 10.06s, Dec=+34d 55m 48.1s (J2000) (1.4 arcmin from
the BAT position) with a count rate of (1.0+/-0.5)E-3 cts s^-1.
SR2 at RA= 17h 40m 45.66s, Dec=+34d 58m 06.7s (J2000) (4.8 arcmin
from the BAT position) with a count rate of (1.1+/-0.5)E-3 cts s^-1.
SR3 at RA= 17h 41m 07.60s, Dec=+34d 52m 33.0s (J2000) (4.4 arcmin from
the BAT position) with a count rate of (1.1+/-0.5)E-3 cts s^-1.
SR4 at RA= 17h 41m 05.17s Dec=+34d 52m 35.5s (J2000) (4.4 arcmin from
the BAT position) with a count rate of (1.2+/-0.5)E-3 cts s^-1.
The last two sources are very close to each other, but are resolved by
the XRT. All these position have a 90% uncertainty of 6.5 arcsec.
None of these sources seems to be fading, and therefore we do not
associate any of them with the afterglow. On-going observations
will shed more light on the nature of these sources.