GRB 050117A, GRB 050117
GCN Circular 2980
Subject
GRB 050117a: Radio Observations
Date
2005-01-25T21:12:48Z (22 years ago)
From
Alicia Soderberg at Caltech <ams@astro.caltech.edu>
A. M. Soderberg (Caltech) and D. A. Frail (NRAO) report on behalf of a
larger collaboration:
"On 2005 January 24.14 UT we carried out follow-up observations with the
VLA centered on the refined XRT position (GCN#2955) of the Swift burst,
GRB 050117A (GCN #2952 and 2962). At a frequency of 8.46 GHz no emission
was detected above a 2-sigma level of 56 microJy within the 30-arcsec
(diameter) error circle.
No further observations are planned."
GCN Circular 2963
Subject
GRB050117a: Radio Observations
Date
2005-01-19T02:43:21Z (22 years ago)
From
Dale A. Frail at NRAO <dfrail@nrao.edu>
Dale A. Frail reports on behalf of a larger collaboration:
"On January 19.08 UT the VLA was used to observe a region toward the
refined XRT position (GCN#2955) of the Swift burst, GRB 050117A (GCN
#2952 and 2962). At a frequency of 8.46 GHz no emission was detected
above a 4-sigma level of 130 microJy within the 30-arcsec diameter
error circle."
GCN Circular 2962
Subject
GRB050117a: Refined analysis
Date
2005-01-18T23:38:44Z (22 years ago)
From
Scott Barthelmy at NASA/GSFC <Scott@lheamail.gsfc.nasa.gov>
S. Barthelmy, L. Barbier (GSFC), J. Cummings (GSFC), E. Fenimore (LANL),
N. Gehrels (GSFC), D. Hullinger (GSFC/UMD), H. Krimm (GSFC/USRA),
C. Markwardt (GSFC/UMD), K. McLean (LANL), D. Palmer (LANL), A. Parsons (GSFC),
T. Sakamoto (GSFC), G. Sato (ISAS), P. Schady (MSSL), M. Suzuki (Saitama),
J. Tueller (GSFC) on behalf of the Swift-BAT team:
Further analysis of Swift-BAT GRB050117a (Sakamoto et al., GCN Circ 2952)
yields the fluence to be 7x10^-6 erg/cm2 in the 15-350 keV band and a
peak flux of 0.88 +/- 0.06 ph/cm2/sec (also 15-350 keV) in a 5-sec wide
window bracketing the highest peak (starting at T+85 sec) in the multi-peak
lightcurve. We note that the ~200-sec duration quoted in Circ 2952
was an eye-ball fit for the the total duration. The proper T90 time
is 169 sec (15-350 keV).
GCN Circular 2960
Subject
GRB050117: Palomar WIRC Ks-band observations
Date
2005-01-18T07:53:11Z (22 years ago)
From
Derek Fox at CIT <derekfox@astro.caltech.edu>
Derek B. Fox and S. Bradley Cenko (Caltech), with Eric J. Murphy
(Yale) report on behalf of a larger collaboration:
"We have imaged the XRT localization region (Hill et al., GCN 2955) of
GRB050117 (Burrows et al., GCN 2951; Sakamoto et al., GCN 2952) with
the Hale Telescope + WIRC camera at Palomar Observatory, in the
Ks-band, from 03:15 to 03:47 UT on Jan 18, with mean epoch 14.7 hours
after the burst. Comparison of our individual images to the 2MASS
Atlas reveals four 2MASS catalog objects, and no new sources to the
Ks~16 mag depth of that survey, within the XRT localization region.
Further analysis of these images is ongoing."
GCN Circular 2958
Subject
GRB050117: optical observation
Date
2005-01-17T22:59:47Z (22 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
R. Karimov, M. Ibrahimov, B. Kahharov, I. Asfandiyarov, D. Sharapov
(UBAI), A.Pozanenko (IKI), V.Rumyantsev (CrAO), G.Beskin (SAO) report:
We observed error box of Swift GRB050117 (Burrows, et al. GCN 2951;
Sakamoto, et al. GCN 2952) with 1.5m telescope of Mt.Maidanak high-altitude
observatory. R-band images (5 x 300 s, 4 x 240 s exposures) were taken
between 15:48 and 17:21 (UT) Jan. 17. In comparison with DSS2 (red plate) no
new source down to R=20 was found in a stacked image within refined XRT
error box (Hill, et al. GCN 2955). More detailed analysis is in a progress.
This message may be cited.
GCN Circular 2957
Subject
GRB 050117, I-band observations
Date
2005-01-17T21:39:08Z (22 years ago)
Edited On
2024-11-18T09:47:12Z (2 years ago)
From
Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct@iaa.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. Sota, M. Jelínek, J. Gorosabel,
A. J. Castro-Tirado (IAA-CSIC, Granada) and J. M. Castro
Cerón (U. Copenhagen)
report:
The refined SWIFT/XRT error box (Hill et al. GCN 2955)
for GRB 050117 (Sakamoto et al. GCN 2952) has been
observed with the 1.5 m telescope at the Observatorio
de Sierra Nevada in Granada, southern Spain. I-band
(6 x 300 s) images were acquired starting on 17 Jan,
18:30 UT (i.e. about 5.6 hr after the GRB trigger).
No new sources within the error box are found when
comparing with the DSS-2 plates down to I = 20.5 .
Near-IR images -specially in the K-band- would be
required in order to indentify the afterglow at these
wavelengths, as there is severe extinction in the line
of sight (A_I = 3.40; A_K = 0.65). This has been also
pointed out by Torii (GCN 2956).
This message can be quoted.
GCN Circular 2956
Subject
GRB 050117: Optical observation
Date
2005-01-17T18:43:54Z (22 years ago)
From
Ken ichi Torii at RIKEN <torii@crab.riken.go.jp>
K. Torii (Osaka University) reports:
The error region of SWIFT GRB 050117 (Burrows, et al. GCN 2951;
Sakamoto, et al. GCN 2952) was observed with the 14-inch ART at Osaka
University. The observation started at 2005 January 17, 14:05 UT and a
sequence of 60-s exposures in B, V, Rc, and Ic was repeated.
We note that Galactic extinction is severe in the burst direction
(E(B-V) = 1.7 or A_R = 4.6 according to Schlegel, et al. 1998) and
compared our stacked Ic-band frame (60-s x 10 frames, mean epoch 14:38
UT) with the USNO-A2.0 (R) magnitude. As a result of the preliminary
analysis, no new source brighter than about 17.5 mag is identified
within the refined XRT error region (Hill, et al. GCN 2955).
===
GCN Circular 2955
Subject
GRB050117: Refined XRT position
Date
2005-01-17T18:09:23Z (22 years ago)
From
David Burrows at PSU/Swift <burrows@astro.psu.edu>
J. E. Hill, J. A. Kennea, D. C. Morris, D. N. Burrows (PSU), A. A. Wells, J. P.
Osborne (U. Leicester), G. Tagliaferri (OAB), M. Ivanushkina, S. Hunsberger, J.
A. Nousek, P. Roming (PSU), P. Schady (MSSL), S. Barthelmy, F. Marshall and N.
Gehrels (NASA/GSFC) report on behalf of the Swift XRT team:
We have derived a refined Swift XRT position for GRB050117, based on preliminary
alignment corrections to the raw position reported in Burrows et al. (GCN 2951).
The refined XRT position is:
RA(J2000) = 358.47067 = 23h 53m 53.0s
Dec(J2000) = +65.93882 = +65:56:20
The estimated uncertainty in this position is 15 arcseconds (radius).
This is the first time that the Swift observatory has executed a prompt slew to
a GRB, and the XRT position was measured 192 seconds after the burst occurred.
Because the burst was quite long, the first XRT data were collected before the
burst ended, a first for a focussed X-ray GRB/afterglow observation. We note
that the XRT in-flight calibration program has not yet begun because the Swift
observatory is still in its commissioning phase.
The burst occurred at 12:52:36 UT (Sakamoto et al., GCN 2952) just before Swift
entered the South Atlantic Anomaly (SAA) and while the burst location was
within the Swift Earth limb constraint. The Swift spacecraft began slewing to
the burst at 12:54:38 UT, while in the SAA. The XRT imaged the source
immediately after the slew ended, at 12:55:48.64 UT. The source was very
bright, resulting in a successful centroid on the first 0.1s Image Mode
exposure. The XRT then collected a partial Photodiode Mode frame and stopped
data collection because it was in the SAA. Although we have not yet calibrated
fluxes measured in XRT's Image Mode, the X-ray source intensity in the Image
Mode frame appears to be comparable to Cyg X-2, which puts it at roughly 1/2
Crab (based on RXTE ASM data on Cyg X-2 and the Crab).
The source is located just outside the zero-visibility region around the Swift
orbit pole and has only short periods of visibility on each orbit. Most of
these visible periods occur while Swift is in the SAA, which limits the
amount of time when the source can be viewed by the XRT. Automated observations
will proceed for the rest of 2005 Jan 17 when the source is visible. We expect
to obtain a total observing time of about 15 minutes, spread out between 12:55
UT and 19:29 UT. Because of orbital precession, the source will not be visible
again by the Swift XRT until 2005 Jan 21.
GCN Circular 2954
Subject
GRB050117: MASTER optical observations
Date
2005-01-17T17:43:37Z (22 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
V. Lipunov, A.Krylov, V.Kornilov, G.Borisov, D.Kuvshinov,
A.Belinski, M.Kuznetsov, S.Potanin, G.Antipov,
E.Gorbovskoy, N.Tyurina
Sternberg Astronomical Institute, Moscow
After SWIFT alert (GCN 2951) MASTER robotic
telescope (http://observ.pereplet.ru) had imaging the
corresponding area of the sky under the bad weather conditions. We have
50 unfiltered images of the error box (45s exposition, 6 square degrees
field) started at 17 Jan 2005 14:58:40 UT (2 hours after GRB time).
The limiting magnitude on the summ of the best 10 images was about 19.0.
There is no OT within the 0'5 SWIFT error circle.
The central part of the JPG-images are available at
http://observ.pereplet.ru/images/SRG1806-20/050117/summ10.jpg
This message may be cited.
This work is partly supported by RFFI 04-02-16411.
Mailto: lipunov@sai.msu.ru
GCN Circular 2953
Subject
MASTER:GRB050117 SWIFT
Date
2005-01-17T15:33:32Z (22 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
V. Lipunov, A.Krylov, V.Kornilov, G.Borisov, D.Kuvshinov,
A.Belinski, M.Kuznetsov, S.Potanin, G.Antipov,
E.Gorbovskoy, N.Tyurina
Sternberg Astronomical Institute, Alexsandr Krylov Observatory, Moscow
After SWIFT alert (GCN 2951) MASTER robotic
telescope (http://observ.pereplet.ru) had imaging the
corresponding area of the sky. We have unfiltered
images of the error box (45s exposition, 6 square degrees
field) started at 17 Jan 2005 14:58:40 UT (after 2 hours GRB time).
The limiting magnitude on the first image was about 17.0.
There is no OT within the SWIFT error circle.
JPG-images are available at
http://observ.pereplet.ru/images/SRG1806-20/050117/
Observations are continued.
This message may be cited.
This work is partly supported by RFFI
04-02-16411.
GCN Circular 2952
Subject
GRB050117: Swift-BAT detection of a long multi-peaked burst
Date
2005-01-17T14:57:54Z (22 years ago)
From
Scott Barthelmy at NASA/GSFC <Scott@lheamail.gsfc.nasa.gov>
T. Sakamoto (GSFC), S. Barthelmy, L. Barbier (GSFC), A. Blustin (MSSL),
J. Cummings (GSFC), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (GSFC/UMD), J. Kennea (PSU) H. Krimm (GSFC/USRA),
C. Markwardt (GSFC/UMD), K. McLean (LANL), T. McMahon (Langston U.),
D. Palmer (LANL), A. Parsons (GSFC), G. Sato (ISAS), P. Schady (MSSL),
M. Suzuki (Saitama), J. Tueller (GSFC)
on behalf of the Swift-BAT team:
At 12:52:36 UT, the Swift Burst Alert Telescope (BAT) triggered and
located on-board GRB050117. The spacecraft autonomously slewed
to the burst for the first time with a real GRB.
The BAT on-board calculated location is RA,Dec 358.427,+65.945 (J2000)
with an uncertainty of 4 arcmin (radius, 3-sigma, including a systematic
uncertainty). This is within 55 arcsec of the XRT position (Burrows et al.,
GCN Circ 2951). This burst occurred while Swift was near the SAA.
The lightcurve is multi-peaked with a duration of ~200 sec. We note that
the XRT was on target during the later portion of the gamma-ray phase
of the burst.
GCN Circular 2951
Subject
GRB050117: Swift XRT Position
Date
2005-01-17T13:42:00Z (22 years ago)
From
David Burrows at PSU/Swift <burrows@astro.psu.edu>
D. N. Burrows, J. E. Hill, G. Chincarini, J. Nousek, N. Gehrels, and P. Schady
report on behalf of the Swift XRT team:
The Swift XRT reported a prompt position for GRB050117. The burst was
discovered by the BAT and the Swift spacecraft performed a prompt slew. The
XRT found a bright source in the field and imaged it at
IMG_START_DATE: 13387 TJD; 17 DOY; 05/01/17
IMG_START_TIME: 46548.64 SOD {12:55:48.64} UT
The XRT position is
GRB_RA: 358.4644d {+23h 53m 51s} (J2000),
358.5274d {+23h 54m 07s} (current),
357.8439d {+23h 51m 23s} (1950)
GRB_DEC: +65.9418d {+65d 56' 30"} (J2000),
+65.9699d {+65d 58' 12"} (current),
+65.6635d {+65d 39' 49"} (1950)
The XRT positions are not yet fully calibrated, and we estimate an uncertainty
of 30 arcseconds in these coordinates. The XRT prompt image confirms that a
point source is located at this position. A check of SIMBAD shows no bright
X-ray sources in this location. Further information, including an XRT
lightcurve and spectrum, will be available in a few hours.