GRB 060115
GCN Circular 4509
Subject
GRB 060115: Swift detection of a burst
Date
2006-01-15T13:54:08Z (19 years ago)
From
Scott Barthelmy at NASA/GSFC <Scott@lheamail.gsfc.nasa.gov>
G. Tagliaferri (INAF-OAB), S. Barthelmy (GSFC), A. Beardmore (U Leicester),
D. Burrows (PSU), D. Fox (PSU), N. Gehrels (GSFC), C. Gronwall (PSU),
J. Kennea (PSU), F. Marshall (GSFC), D. Palmer (LANL), M. Perri (ASDC)
on behalf of the Swift team:
At 13:08:00 UT, Swift-BAT triggered and located GRB 060115 (trigger=177408).
The spacecraft slewed immediately. The BAT on-board calculated location is
RA,Dec 54.044d,+17.344d {03h 36m 11s,+17d 20' 38"} (J2000), with an uncertainty
of 3 arcmin (radius, 90% containment, stat+sys). The BAT light curve shows
an ~10-sec peak at T_zero. There is a probable second peak at T+90 sec
(~20 sec width). The peak count rate was ~1000 counts/sec (15-350 keV),
at ~5 seconds after the trigger. We note that this probably long total duration
and smooth lightcurve may indicate a high redshift burst.
XRT began observing the field at 13:09:53 UT, 113 sec after the BAT trigger.
On-board centroiding found a previously uncatalogued bright fading X-ray
source in the field of view at the following coordinates:
RA(J2000) = 03h 36m 08.6s
Dec(J2000)= +17d 20' 46.3"
This location is 36 arcseconds from the BAT position. The estimated uncertainty
is 6 arcseconds (90% confidence radius). The initial flux was
4.1E-9 ergs/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of nominal 200 seconds with the V filter
starting 119 seconds after the BAT trigger. No afterglow candidate
has been found in the initial data products. Image catalog data
are not available at this time. The 8'x8' region for the list of sources
generated on-board covers 100% of the XRT error circle. The list of sources
is typically complete to about 18.0 mag. No correction has been made
for the expected visual extinction of about 0.4 magnitudes.
GCN Circular 4510
Subject
GRB 060115: MITSuME optical afterglow candidate
Date
2006-01-15T16:19:24Z (19 years ago)
From
Nobuyuki Kawai at Tokyo Tech <nkawai@hp.phys.titech.ac.jp>
K. Yanagisawa (OAO/NAOJ), H. Toda, and N. Kawai (Tokyo Tech) report
on behalf of the MITSuME collaboration:
"We have observed the field of GRB 060115 (Tagliaferri et al. GCN 4509)
with the three-color MITSuME 50 cm telescope at Okayama, Japan,
starting from 13:14 UT (T_burst + 6 min).
In the Rc and Ic band images, we have detected a fading source inside
the Swift XRT error circle that is not present in the DSS2-r image.
The coordinates of the fading object are:
RA(J2000): 03:36:08.4, Dec(J2000): +17:20:43 (error +/- 2 arcsec)"
GCN Circular 4511
Subject
GRB060115, optical observation
Date
2006-01-15T16:49:27Z (19 years ago)
From
Eri Sonoda at U of Miyazaki/Japan <sonoda@astro.miyazaki-u.ac.jp>
E.Sonoda,Y.Nakamura,S.Maeno,S.Masuda,M.Yamauchi
(University of Miyazaki)
"We have observed the field covering the error circle of
GRB060115 (GCN 4509) with the unfiltered CCD camera on
the 30-cm telescope at University of Miyazaki.
The observation was started 13:36:56 UT on Jan.15.
After co-adding a set of 30 images (13:36:56 - 14:28:26 UT)
of 30 sec exposures, we have compared with the USNO A2.0 catalog.
Preliminary analysis shows there is no new source brighter
than 18.1 mag."
GCN Circular 4513
Subject
GRB 060115: OT finding chart
Date
2006-01-15T17:17:32Z (19 years ago)
From
Nobuyuki Kawai at Tokyo Tech <nkawai@hp.phys.titech.ac.jp>
K. Yanagisawa (OAO/NAOJ), H. Toda, and N. Kawai (Tokyo Tech) report
on behalf of the MITSuME collaboration:
"We have placed the Rc band finding chart for the optical transient
(Yanagisawa et al. GCN 4510) detected in the XRT error circle of
GRB 060115 (Tagliaferri et al. GCN 4509) at the following URL:
http://bragi.oao.nao.ac.jp/support/telescope/grb50/images/GRB060115A-Chart.pdf"
GCN Circular 4514
Subject
GRB 060115: Swift XRT refined analysis
Date
2006-01-15T20:16:30Z (19 years ago)
From
Matteo Perri at ISAC/ASDC <perri@asdc.asi.it>
M. Perri (ASDC), G. Chincarini (Univ. Milano-Bicocca), G. Tagliaferri
(INAF-OAB), D.N. Burrows (PSU), M. Tripicco (GSFC-SSAI) and F. Marshall
(GSFC) report on behalf of the Swift XRT team:
We have analyzed the first two orbits of XRT data from GRB 060115
(trigger 177408, GCN 4509). A 1260s Photon Counting mode image
provides a refined XRT position:
RA(J2000) = 03h 36m 08.49s,
Dec(J2000) = +17d 20m 45.3s
with an uncertainty of 3.8 arcsec (90% containment). This position
is 1.7 arcsec away from the on-board XRT position (Tagliaferri et al.,
GCN 4509) and includes the latest XRT boresight correction. This
position is 2.6 arcsec from the optical afterglow position (which
also has an uncertainty of 2 arcsec) reported by Yanagisawa et al.
(GCN 4510).
The X-ray light curve in the first two orbits can be fit with a broken
power-law with an initial decay slope of -3.3+/-0.1, a break at
T+570+/-40 s, and a post-break slope of -0.7+/-0.1. At around T+400s
some flare activity is also evident.
A power-law fit to the X-ray spectrum from T+121s to T+153s gave a
photon index of 1.8+/-0.1 and a column density of (1.5+/-0.6)E21 cm**-2,
consistent with the Galactic hydrogen column density in the direction
of the burst of 1.3E21cm**-2.
If the burst continues to decay at the current rate we estimate an XRT
count rate of 8E-3 counts/s at T+24hr, which corresponds to an observed
0.3-10.keV flux of ~4E-13 ergs cm**-2 s**-1.
GCN Circular 4516
Subject
GRB 060115: Swift/UVOT upper limits
Date
2006-01-16T00:13:52Z (19 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
P. Schady (UCL-MSSL/PSU), A. Cucchiara (PSU), M. De Pasquale (UCL-MSSL), F.
Marshall (GSFC), N. Gehrels (GSFC) on behalf of the Swift/UVOT team
The Swift/UVOT began observing the field of GRB 060115 at 13:09:59 on
2006-01-15 whilst settling on the target, 119 s after the BAT trigger
(Tagliagerri et al., GCN 4509). No new source is detected either at the XRT
position (Perri et al., GCN 4514) or at the position of the candidate afterglow
reported by Yanagisawa et al. (GCN 4510) in coadded images with any of the
filters. The following 3-sigma magnitude upper limits are not corrected for
Galactic extinction; E(B-V) = 0.133.
Filter T_range(s) Exp(s) 3sigUL(mag)
V 104-1585 488.1 19.5
B 326-1042 199.7 20.4
U 651-1657 99.0 19.3
W1 627-1788 105.9 19.4
M2 603-1777 118.8 19.5
W2 556-1730 99.0 19.7
White 531-1705 99.0 19.8
_______________________________________________
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Uvot_cal@phoenix.astro.psu.edu
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GCN Circular 4517
Subject
GRB 060115: OT photometry with MITSuME
Date
2006-01-16T00:35:13Z (19 years ago)
From
Nobuyuki Kawai at Tokyo Tech <nkawai@hp.phys.titech.ac.jp>
K. Yanagisawa (OAO/NAOJ), H. Toda, and N. Kawai (Tokyo Tech) report
on behalf of the MITSuME collaboration:
"We have performed photometry of the afterglow candidate (Yanagisawa
et al. GCN 4510,4513) of GRB 060115 (Tagliaferri et al. GCN 4509) for
the stacked images of the entire effective exposure (42 min) and for
the subdivided half intervals, which were calibrated against the
USNO-B1.0 R2 and I2 stars:
Entire exposure:
Exposure Start 13:14 (UT)
Exposure End 14:10 (UT)
$B!!(BMidTime 13:42 (UT, T_burst + 34 min)
Exp = 60sec x 42
Rc = 19.2 +/- 0.4 mag
Ic = 18.5 +/- 0.5 mag
First half:
Exposure Start 13:14 (UT)
Exposure End 13:40 (UT)
$B!!(BMidTime 13:27 (UT, T_burst + 19 min)
Exp = 60sec x 21
Rc = 19.1 +/- 0.5
Ic = 17.9 +/- 0.4
Second half:
Exposure Start 13:42(UT)
Exposure End 14:10(UT)
$B!!(BMidTime 13:56(UT, T_burst + 48 min)
Exp = 60sec x 21
Rc > 19.1
Ic > 19.0
Note that the exposures in different colors are completely synchronized.
The comparison images in three bands can be viewed at the following URL:
http://bragi.oao.nao.ac.jp/support/telescope/grb50/images/GRB060115A-Fading.pdf."
GCN Circular 4518
Subject
GRB 060115: Refined analysis of the Swift-BAT burst
Date
2006-01-16T00:52:07Z (19 years ago)
From
Scott Barthelmy at NASA/GSFC <Scott@lheamail.gsfc.nasa.gov>
L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC),
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (GSFC/UMD),
K. Hurley (Berkeley), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),
J. Norris (GSFC), D. Palmer (LANL), A. Parsons (GSFC),
T. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC)
on behalf of the Swift-BAT team:
Using the downloaded data set from T-300 to T+302 sec
from recent telemetry downlinks, we report further analysis
of BAT GRB 060115 (trigger #177408) (Tagliaferri, et al., GCN 4509).
The BAT ground-calculated position is (RA,Dec) = 54.005,+17.336 deg
{03h 36m 01.1s,+17d 20' 10.5"} (J2000) +- 2.0 arcmin, (radius,
sys+stat, 90% containment). This is 1.7 arcmin from the position
reported by the XRT (Perri, et al. GCN 4514). The partial coding was 85%.
The lightcurve consists of faint precursor peak starting at T-50 sec,
peaking around T-30sec, and merging into the second peak.
The second peak is roughly triangular in shape, starting
at T-15 sec, peaking at T+5sec, and ending at T+40 sec. There is
a third and largest peak (also roughly triangular in shape)
starting at T+80 sec, peaking at T+95 sec, and ending at T+120 sec.
T90 (15-350 keV) is at least 142 +- 5 sec (estimated error
including systematics).
The power law index of the time-averaged spectrum is 1.76 +- 0.12.
The fluence in the 15-150 keV band is (1.9 +- 0.1) x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+94.71 sec in the 15-150 keV
band is (0.9 +- 0.1) ph/cm2/sec. A cut-off power law model is
a marginally better fit to the data. The power law index is
1.0 +/- 0.5 and Epeak is 62 (+31)(-10) keV; the total fluence is
(1.8 +/- 0.2) x 10^-6 erg/cm2 and the peak flux is (0.9 +/- 0.1) ph/cm2/sec.
All the quoted errors are at the 90% confidence level.
GCN Circular 4520
Subject
GRB 060115: absorption redshift
Date
2006-01-16T11:12:43Z (19 years ago)
From
Daniele Malesani at SISSA-ISAS,Trieste,Italy <malesani@sissa.it>
S. Piranomonte, V. D'Elia, F. Fiore (INAF/OAR), S. Covino, D. Fugazza
(INAF/OABr), G. Chincarini (Univ. Milano-Bicocca), D. Malesani
(SISSA/ISAS), P. D'Avanzo (INAF/OABr), L.A. Antonelli (INAF/OAR), C.
Ledoux, A. Lopez, and D. Naef (ESO), report on behalf of the MISTICI
collaboration:
We obtained medium-resolution spectra of the optical counterpart
(Yanagisawa, Toda & Kawai, GCN 4510) of GRB 060115 (Tagliaferri et al.,
GCN 4509; Perri et al., GCN 4514; Barbier et al., GCN 4518).
Observations were carried out with the ESO-VLT, equipped with the FORS1
instrument and the grism 300V.
Preliminary analysis of two 30-min spectra taken starting on Jan 16.044
UT shows a DLA at ~5500 A (observer frame), together with a rich
absorption system which includes NV(1238,1242), SiIV(1393,1402), and
CIV(1548,1550). The inferred redshift is z = 3.53.
This message can be cited.
GCN Circular 4526
Subject
GRB060115: REM observations
Date
2006-01-16T17:21:10Z (19 years ago)
From
Elisa Distefano at OACt <elisa.distefano@gmail.com>
E. Distefano, S. Covino, E. Molinari, G. Chincarini, F.M. Zerbi, V. Testa,
G. Tosti, F. Vitali, L.A. Antonelli, P. Conconi, G. Cutispoto, G.
Malaspina, L. Nicastro, E. Palazzi, E. Meurs, P. Goldoni, on behalf of the
REM/ROSS team, report:
On Jan 16, 2005 the field of GRB 060115 (Tagliaferri et al. GCN 4509) was
observed with the REM telescope located in La Silla (Chile).
The field was imaged with the ROSS optical spectrograph/imager and with
the REMIR near infrared camera in the R and H filters, respectively,
starting at 0:50 UT (approximately 11 hours after the burst) for a total
integration time of 1200 and 800 s, respectively.
No sources are detected within the SWIFT-XRT error circle down to
limiting magnitudes R = 17.7 and H = 15.1 (3-sigma upper limits).
This message is citeable
GCN Circular 4530
Subject
GRB 060115: PROMPT Observations
Date
2006-01-16T22:49:30Z (19 years ago)
From
Melissa Nysewander at UNC,Chapel Hill <mnysewan@astro.unc.edu>
M. Nysewander, A. LaCluyze, D. Reichart, J.A. Crain, A. Foster, K. Ivarson,
J. Haislip, C. MacLeod and J. Kirschbrown report on behalf of the UNC team
of the FUN GRB collaboration:
We observed the error region of GRB 060115 (Tagliaferri et al., GCN 4509)
with four of the PROMPT telescopes simultaneously in UBr'i'Iz' beginning
11.7 hours after the burst under the automated control of SkyNet. Each
exposure is 80 s long; the table below gives details of the observations:
Filter Telescope Start (UT) Stop (UT) # Exp Total (hr)
U P2 00:48:44 04:54:24 165 3.67
B P5 02:14:13 03:37:52 58 1.29
r' P4 00:48:46 04:54:34 110 2.44
I P1 00:50:31 04:56:38 168 3.73
i' P4 02:14:12 03:37:53 58 1.29
z' P5 00:48:46 04:54:36 110 2.44
At a mean time of 13.6 hours after the burst, we do not detect the
afterglow (Yanagisawa et al., GCN 4510) down to a 3-sigma limiting
magnitude of r' = 21.5 based on 5 NOMAD-VR magnitudes transformed to r' via
the equations given in Smith et al. (2002).
PROMPT is currently being built and commissioned at CTIO.
Smith et al. 2002, ApJ, 123, 2121