GRB 050520
GCN Circular 3430
Subject
GRB 050520 - A long GRB detected with INTEGRAL
Date
2005-05-20T01:07:08Z (20 years ago)
From
Diego Gotz at IASF-CNR <diego@mi.iasf.cnr.it>
D. Gotz, S. Mereghetti (IASF, Milano), N. Mowlavi, S. Shaw, M. Beck
(ISDC, Versoix) and J. Borkowski (CAMK, Torun) on behalf of the IBAS
Localization Team report:
A 80 s long GRB has been detected by IBAS in IBIS/ISGRI data at 00:05:53
on May 20 2005.
Its refined coordinates (J2000) are:
RA: 192.5087 [degrees]
DEC: +30.4506 [degrees]
with an uncertainty of 1.5 arcmin (90% c.l. radius).
Its preliminary peak flux (20-200 keV, 1s integration time) is about 0.7
ph (5E-08 erg)/cmsq/s. Its fluence (20-200 keV, 80 s integration time) is
28.6 ph (2.4E-06 erg)/cmsq.
A plot of the multi peaked light curve will be posted at
http://ibas.mi.iasf.cnr.it/IBAS_Results.html
Note that this burst is located at high galactic latitude (b=+86 deg) and
not affected by Galactic absorption. It is therefore a good target for
optical follow-up searches.
This message can be cited.
GCN Circular 3431
Subject
GRB 050520: BART optical limit
Date
2005-05-20T01:37:11Z (20 years ago)
From
Martin Jelinek at Inst.Astrophys.Andalucia,Granada <mates@asu.cas.cz>
Martin Jelinek (IAA Granada, Spain),
Martin Nekola, Petr Kubanek, Filip Munz, Jan Strobl and Rene
Hudec (ASU AV CR Ondrejov, Czech Republic)
report:
Robotic telescope BART located at Astronomical Institute in
Ondrejov has observed the errorbox of the INTEGRAL trigger
2505 15 minutes after the GRB time. We do not detect any new
source within the given errorbox down to limiting magnitude
V=14.
GCN Circular 3432
Subject
GRB 050520: OSN optical observations
Date
2005-05-20T01:50:54Z (20 years ago)
Edited On
2024-11-18T09:52:47Z (6 months ago)
From
Alberto Castro-Tirado at LAEFF-INTA <ajct@laeff.esa.es>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>
A. de Ugarte Postigo, A. J. Castro-Tirado, A. Sota,
M. Jelínek, J. Gorosabel and S. Guziy (IAA-CSIC Granada)
report:
"Following the detection by INTEGRAL of GRB 050520
(Gotz et al. GCN Circ. 3430), we have taken images
in the VRI bands with the 1.5m telescope at IAA's
Observatorio de Sierra Nevada, starting at 00:39 UT
(i.e. 30 minutes after the event). The co-add of
the first three I-band frames (3 x 300 s exposure
time) reveals no optical counterpart in the 1.5'
radius error box down to the DSS2 limiting magnitude.
Further analysis is ongoing."
This message can be quoted.
GCN Circular 3433
Subject
GRB 050520: VLT/ULTRACAM observations
Date
2005-05-20T03:43:33Z (20 years ago)
From
Paul Vreeswijk at ESO <pvreeswi@eso.org>
P. Vreeswijk (ESO), T. Marsh (U. Warwick), S. Littlefair, V. Dhillon
(U. Sheffield), K. O'Brien (ESO) report on behalf of a larger collaboration:
We observed the central 2.3'x2.3' of the field of GRB 050520 (INTEGRAL
trigger 2505) with the high-time resolution imaging instrument ULTRACAM,
currently attached to the visitor focus of VLT/Melipal. The ULTRACAM
pointing covers about 70% of the INTEGRAL error circle (see Gotz et al.,
GCN 3430). The observations started at 00:18:21 UT (12.5 minutes after the
trigger), and were performed in u', g' and r' simultaneously. The field
was exposed for about 15 minutes, with a sampling time of one second,
which is basically the same as the exposure time due to the negligible
read-out time. Comparison of the individual exposures with the DSS-II
reveals no obvious new source. Moreover, we looked for variability by
combining all exposures (~1000) into 10 sets of 100 individual exposures
each, and subtracting these off one other. Again, no obvious counterpart
is detected.
For more information on ULTRACAM, see:
http://www.shef.ac.uk/physics/people/vdhillon/ultracam/
GCN Circular 3434
Subject
GRB 050520: Swift XRT position
Date
2005-05-20T10:44:37Z (20 years ago)
From
Jamie A. Kennea at PSU/Swift-XRT <kennea@astro.psu.edu>
J. A. Kennea, D. N. Burrows (PSU), M. Perri (ASDC), J. Cummings (GSFC) and
N. Gehrels (NASA/GSFC) report on behalf of the Swift XRT team:
INTEGRAL detected GRB050520 at 00:05:53 UT on 20th May 2005 (GCN Circ
3430). The Swift observatory executed an Target of Opportunity observation
of the INTEGRAL position and the XRT began taking data at 02:13:34 UT. In
a preliminary data analysis we detect a uncataloged X-ray source located
at:
RA(J2000) = 12:50:05.9,
Dec(J2000) = +30:27:01
We estimate an uncertainty of 5 arcseconds radius (90% containment). This
position is 49 arcseconds from the INTEGRAL position reported in GCN 3430.
Observations are still underway and further ground analysis will be
performed to determine if this X-ray source is fading.
GCN Circular 3435
Subject
GRB 050520: TAROT optical limit
Date
2005-05-20T11:37:42Z (20 years ago)
From
Jean-Luc Atteia at Lab d Astrophys.,OMP,Toulouse <atteia@ast.obs-mip.fr>
Klotz, A., Boer M. (OHP), and Atteia, J.L. (LAT) report:
We imaged the entire field of GRB 050520 detected by INTEGRAL (cf. Gotz et al. GCNC 3430)
with the TAROT robotic telescope (D=25cm) located at the Calern observatory,
France. Observations started at 00:06:40s UT, 8 seconds after the GCN notice,
and 47s after the GRB. The field had an elevation of 46 degrees
above horizon at the begining of the observations.
The first two images (unfiltered) were recorded while the burst was still active.
We detect no source at the position of the X-ray afterglow seen by SWIFT
(Kennea et al. GCNC 3434), either during or after the burst. We measure the
following magnitude limits:
Image # start time end time Rlim
#1 To+47s To+62s 16.0
#2 To+69s To+84s 16.0
#1+2 To+47s To+84s 16.1
#3-10 To+90s To+451s 17.2
This notice can be cited.
GCN Circular 3436
Subject
RBO Observations of GRB050520
Date
2005-05-20T14:15:39Z (20 years ago)
From
Ron Canterna at U of Wyoming <canterna@uwyo.edu>
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------_=_NextPart_001_01C55D46.6267D8C6--
GCN Circular 3437
Subject
GRB050520: Liverpool Telescope follow-up
Date
2005-05-20T14:37:30Z (20 years ago)
From
Cristiano Guidorzi at ARI,Liverpool JMU <crg@astro.livjm.ac.uk>
C. Guidorzi, I. A. Steele, A. Monfardini, C.J. Mottram, A. Gomboc,
D. Carter, M.F. Bode, C.G. Mundell, R.J. Smith (Liverpool JMU) report:
"The 2-m Liverpool Telescope followed up robotically the INTEGRAL
GRB050520 (Gotz et al, GCN 3430) and started observing 4.5 min after
the GRB at 00:10:25.7 UT.
The GRB pipeline did not detect any candidate r'<16.6 in the first 3
10-s images. In particular, no source has been found in the XRT error
circle (Kennea et al., GCN 3434).
From a 3x120s stacked image taken between 8 min and 16 min after the
GRB, we detect no candidate r'<20.
Limiting magnitudes have been derived by comparison with USNOB1.
These poor limits are mainly due to the proximity of the Moon.
This message can be cited."
GCN Circular 3438
Subject
GRB 050520: P200 Observations
Date
2005-05-20T14:59:28Z (20 years ago)
From
S. Bradley Cenko at Caltech <cenko@srl.caltech.edu>
S. Bradley Cenko, Derek B. Fox, S. R. Kulkarni, Naveen Reddy, Dawn Erb,
David Law, and Chuck Steidel report on behalf of the Caltech-NRAO-Carnegie
GRB collaboration:
We have imaged the field of GRB 050520 (Gotz et al., GCN 3430) with the
Wide Field Infrared Camera (WIRC) mounted on the Palomar 200" Hale
Telescope. Observations consisted of 27 dithered frames for a total
integration time of 22.5 minutes at a mean epoch of approximately 6:35 UT
(6.5 hours after the burst). All images were taken in the Ks filter.
We find no sources inside the XRT error circle (Kennea et al, GCN 3434).
Our limiting magnitude, estimated by comparison with the 2mass object
12501123+3027515 (Ks = 15.42), is approximately Ks > 20.0.
However, we do find two faint sources just outside the XRT error circle.
Their coordinates (J2000.0) and approximate magnitudes are:
RA Dec Distance from XRT Ks
-------------------------------------------------------------------------
12:50:06.0 30:27:06.7 5.8" 19.3
12:50:06.3 30:26:55.1 7.8" 19.1
Both sources are too faint to search for variability in our exposures.
GCN Circular 3439
Subject
RBO Observations of GRB050520
Date
2005-05-20T15:22:22Z (20 years ago)
From
Ron Canterna at U of Wyoming <canterna@uwyo.edu>
D. Allen, C. Rodgers and R. Canterna report
on behalf of the RBO Team of the FUN GRB Collaboration:
We observed the position of the afterglow of GRB 050520
(Gotz et al., GCN 3430; Kennea et al., GCN 3434)
with the Red Buttes Obse rvatory 24-inch telescope
under semi-photometric conditions in VRI bands,
all 10 minutes exposures on JD2453510.6. Within a FOV
of 8 arcmin of the Swift position (GCN 3434)
we do not detect the afterglow or no new source
down to the following limiting values:
UT Start Time Filter Limiting
Since GRB (hr) Magnitude
03:39 3:34 V 19.5
03:51 3:45 R 19.5
04:01 3:55 I 18.3
04:12 4:06 V 19.4
04:23 4:17 R 19.7
04:34 4:28 I 18.4
04:46 4:40 V 19.6
04:56 4:50 R 19.4
05:07 5:11 I 19.0
05:19 5:13 V 19.6
05:29 5:23 R 19.8
05:40 5:44 I 18.8
10 sigma limiting magnitudes were derived from the USNO-B1.0 catalogue and
photometric transformations from Landolt standards.
GCN Circular 3443
Subject
GRB 050520: Swift XRT refined analysis
Date
2005-05-20T20:40:49Z (20 years ago)
From
Jamie A. Kennea at PSU/Swift-XRT <kennea@astro.psu.edu>
M. Perri, M. Capalbi, P. Giommi (ASDC), J. A. Kennea, D. N. Burrows (PSU),
J. Norris, N. Gehrels (GSFC) report on behalf of the Swift XRT team:
We have analyzed the Swift XRT data from the GRB 050520 discovered by INTEGRAL
(Gotz et al., GCN 3430). The source identified by Kennea et al. 2005 (GCN 3434)
is clearly fading and is therefore the likely X-ray afterglow of this burst.
The new refined coordinates of the X-ray afterglow are:
RA(J2000) = 12:50:06.2
Dec(J2000) = 30:27:02
This position is 53 arcseconds from the INTEGRAL position given in GCN 3430
(Gotz al. 2005) and 4 arcsec from the preliminary XRT position reported in GCN
3434 (Kennea et al. 2005). We estimate an uncertainty of 5 arcseconds radius
(90% containment). The first and second sources reported in GCN 3438 (Cenko et
al. 2005) are 5.4 and 7 arcseconds from the center of our refined error circle,
respectively.
The total exposure time in Photon Counting (PC) mode is 16860 seconds starting
from 02:13:39 UT to 14:52:09 UT on 20 May 2005. The 0.3-10 keV light curve can
be fitted by a single power law with decay index alpha = -1.4 +/- 0.6.
The average source count rate (0.5-10 keV) is (2.8+/-0.5)e-3 cts/s. Assuming a
Crab-like spectrum and Galactic absorption (1.2e20 cm^-2) the average estimated
unabsorbed 0.5-10 keV flux is 1.0e-13 erg cm^-2 s^-1.
GCN Circular 3444
Subject
Swift UVOT Observations of GRB 050520
Date
2005-05-20T21:04:44Z (20 years ago)
From
Caryl Gronwall at PSU/Swift-UVOT <caryl@astro.psu.edu>
C. Gronwall (PSU), J. Norris (GSFC), A. Morgan (PSU),
P. Schady (MSSL), N. Gehrels (GSFC), on behalf of the
Swift UVOT Team
INTEGRAL detected GRB 050520 at 00:05:53 UT on 20th May 2005
(Gotz et al., GCN 3430). Swift executed a Target of Opportunity
observation of the INTEGRAL position. The Swift Ultra-Violet/Optical
Telescope (UVOT) began observations of GRB050520 at UT 02:13:38,
approximately 2hr 8 minutes after the INTEGRAL detection.
We detect no new source within the Swift XRT error circle
(Kennea et al., GCN Circ. 3443) in any of the UVOT filters
with the following 5 sigma and 3 sigma limits (in 6" radius apertures):
Filter Lim_Mag Lim_mag Total duration (s) T_range (hr)
5sigma 3sigma
V 19.84 20.39 3069 5.48 - 13.26
B 21.05 21.60 2699 4.98 - 11.90
U 20.58 21.13 2674 3.62 - 11.65
UVW1 21.30 21.86 3173 3.37 - 13.73
UVM2 21.36 21.91 2824 2.13 - 13.50
UVW2 21.64 22.19 2456 5.23 - 12.12
T_range is time since the INTEGRAL detection.
The magnitudes are based on preliminary zero-points, measured in
orbit, and will require refinement with further calibration.
This message may be cited.
GCN Circular 3445
Subject
GRB 050520: VLT/ULTRACAM observations
Date
2005-05-21T01:26:29Z (20 years ago)
From
Paul Vreeswijk at ESO <pvreeswi@eso.org>
P. Vreeswijk (ESO), T. Marsh (U. Warwick), S. Littlefair, V. Dhillon
(U. Sheffield), K. O'Brien (ESO) report on behalf of a larger
collaboration:
The Swift XRT afterglow (see Kennea et al., GCN 3434, Perri et al.,
GCN 3443) is located roughly 15" off the field-of-view of the
VLT/ULTRACAM observations reported in GCN 3433.
GCN Circular 3453
Subject
GRB050520: Radio Observations
Date
2005-05-22T20:08:32Z (20 years ago)
From
Patrick B. Cameron at Caltech <pbc@astro.caltech.edu>
P. B. Cameron (Caltech) and A. M. Soderberg (Caltech) report on behalf of
the Caltech-NRAO-Carnegie GRB Collaboration:
"We observed the field of GRB050520 (GCN#3430) using the Very Large Array
at a frequency of 8.46 GHz on May 20.43 UT and May 21.43 UT. We do not
detect a radio source within the refined XRT error circle (GCN#3443). We
place a 2-sigma upper limit of 57.6 uJy."
GCN Circular 3458
Subject
GRB050520,optical observation
Date
2005-05-23T09:48:27Z (20 years ago)
From
Shouta Maeno at U.of Miyazaki <shouta@astro.miyazaki-u.ac.jp>
S.maeno,E.sonoda,Y.Tokunaga,M.Yamauchi
(University of Miyazaki)
"We have observed the field covering the error circle of
GRB 050520 (GCN3430 ; INTEGRAL Trigger time is 00:05:53 UT)
with the unfiltered CCD camera on the 30-cm telescope
at University of Miyazaki.
The observation was started 11:53:37 UT on May.20.
Observed field of view is 43 arcmin centered on
R.A=+12:50:50.9
Dec=+30:22:09.5
After co-adding a set of 5 images (11:53:37 - 11:58:08 UT)
of 30 sec exposures, we have compared with the USNO A2.0 catalog.
Preliminary analysis shows there is no new source brighter than
17.2 mag.