GRB 060510B
GCN Circular 5096
Subject
GRB 060510B: Swift detection of a burst
Date
2006-05-10T08:57:19Z (19 years ago)
From
Scott Barthelmy at NASA/GSFC <Scott@lheamail.gsfc.nasa.gov>
H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC),
A. P. Beardmore (U Leicester), D. N. Burrows (PSU),
M. Capalbi (ASDC), M.L. Conciatore (ASDC), N. Gehrels (NASA/GSFC),
C. Gronwall (PSU), S. T. Holland (GSFC/USRA),
J. P. Osborne (U Leicester), K. L. Page (U Leicester),
D. M. Palmer (LANL), M. Perri (ASDC) and L. Vetere (ASDC) report on
behalf of the Swift Team:
At 08:22:14 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 060510B (trigger=209352). Swift slewed immediately to the burst.
The BAT on-board calculated location is RA,Dec 239.141, +78.559
{15h 56m 34s, +78d 33' 33"} (J2000) with an uncertainty of 3 arcmin
(radius, 90% containment, including systematic uncertainty).
Because this is an image trigger, the TDRSS BAT light curve does not show
any significant activity around the trigger time, but we note that there is
possible activity at T+150 and T+300 sec. This possible long duration could be
an indication of a high redshift burst.
The XRT began observing the field at 08:24:13 UT, 119 seconds after the
BAT trigger. XRT found a bright, possibly fading, uncatalogued X-ray source
located at RA(J2000) = 15h 56m 29.3s, Dec(J2000) = +78d 34' 09.4", with an
estimated uncertainty of 4.7 arcseconds (90% confidence radius).
This location is 39 arcseconds from the BAT on-board position, within
the BAT error circle. The initial flux in the 2.5s image was
7.1e-09 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of nominal 100 seconds with the
White (160-650nm) filter starting 129 seconds after the BAT trigger.
No afterglow candidate has beeen found in the initial data products.
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 mag. No correction has been made for extinction.
We note that this is the second Swift burst within 38 minutes. Because
the second burst (GRB 060510B) overwrites the first (GRB 060510A) in
the on-board automated observing program, the NFI follow-up
observations for GRB 060510A will not be available until that burst
can be uploaded as a ToO during normal working hours at the Swift
Mission Operations Center.
GCN Circular 5097
Subject
GRB 060510B: MDM Observations and candidate OT
Date
2006-05-10T09:17:40Z (19 years ago)
From
Nestor Mirabal at U Michigan <mirabal@umich.edu>
N. Mirabal (U. Michigan) and J. P. Halpern (Columbia U.) report
on behalf of the MDM Observatory GRB follow-up team:
"We have observed the Swift BAT location of GRB 060510 (Krim et al., GCN
5096) with the MDM 1.3m telescope on May 10 08:50 UT, 26 minutes after
the trigger. We detect a faint source located at RA:15 56 29.615, Dec:
79 34 13.02 (+/- 2'') in a 600-s I band exposure, which is a potential
optical afterglow for this event. The object appears to be fainter
than R~22.5 in a previous 600~s exposure. This supports the idea that
GRB 060510B could be a high-redshift or highly-reddened burst. Further
observations are encouraged. Results here are very preliminary and
analysis is in progress.
This message may be cited."
GCN Circular 5098
Subject
GRB 060510B: Coordinate correction
Date
2006-05-10T09:36:01Z (19 years ago)
From
Nestor Mirabal at U Michigan <mirabal@umich.edu>
N. Mirabal (U. Michigan) and J. P. Halpern (Columbia U.) report
on behalf of the MDM Observatory GRB follow-up team:
"The correct position of the object reported in our previous circular (GCN
5097) should read RA:15 56 29.615, Dec: 78 34 13.02 (+/- 2''). We
apologize for this mistake. We thank Ken'ichi Torii for pointing it
out."
GCN Circular 5099
Subject
GRB 060510b: NIR observations
Date
2006-05-10T10:18:47Z (19 years ago)
From
Paul Price at IfA,UH <price@ifa.hawaii.edu>
P.A. Price (IfA, Hawaii), T. Minezaki (IoA, Tokyo), L.L. Cowie, Y.
Kakazu (IfA, Hawaii) and Y. Yoshii (IoA, Tokyo) report:
We have observed the XRT localisation of GRB 060510b (GCN #5096) with
the robotic MAGNUM telescope + MIPS dual-beam imager in the J band. Our
observations consisted of 10 x 30 sec exposures commencing 2006 May
10.374 UTC. We do not detect any afterglow candidate at the XRT
position, or at the faint optical afterglow candidate position of
Mirabal & Halpern (GCN #5098), to an estimated limiting magnitude of J ~
19.0 mag (based on comparison with the 2MASS catalogue star at
239.065708,78.573784 with J = 12.9 mag).
GCN Circular 5100
Subject
GRB 060510B: Super-LOTIS Observations
Date
2006-05-10T10:22:13Z (19 years ago)
From
Grant Williams at Steward Observatory <ggwilli@mmto.org>
G. G. Williams (MMTO) and P. A. Milne (Steward Observatory), on behalf of
the Super-LOTIS Collaboration, report:
The robotic 0.6-m Super-LOTIS telescope was manually triggered and began
observing the error box of GRB 060510B (Swift Trigger 209352, GCN 5096) at
08:50:00.7 UT, ~28 minutes after the burst. Our initial observations
include 5 x 10s exposures, 5 x 20s exposures, and 30 x 60s exposures, all
in the R-band.
We do not detect the afterglow reported by Mirabal et al. (GCN 5097) or
any other new source within the XRT error box in our first several
60-second exposures to the following 3-sigma limiting magnitude estimated
using nearby USNO-B1.0 stars:
t obs (UT) exp t (s) t-t_0 (s) Limit
--------------------------------------------------------
08:53:41 60 1877 R > 18.6
Additional observations and analysis are ongoing.
GCN Circular 5101
Subject
GRB 060510b: Gemini NIR observations
Date
2006-05-10T11:23:00Z (19 years ago)
From
Paul Price at IfA,UH <price@ifa.hawaii.edu>
P.A. Price (IfA, Hawaii), S.B. Cenko (Caltech) and D.B. Fox (Penn State)
report on behalf of a larger collaboration:
We have observed the XRT localisation of GRB 060510b (GCN #5096) with
the Gemini North telescope + NIRI. Our observations consisted of 18 x
60 sec integrations commencing 2006 May 10.415 UTC. We detect the
optical afterglow candidate of Mirabal & Halpern (GCN #5098), and
estimate that the source is J ~ 19 mag (based on comparison with 2MASS
star at 239.121115,+78.575104 with J = 16.6 mag).
A finding chart is available at:
http://www.ifa.hawaii.edu/~price/grb060510b.ps
We have triggered optical spectroscopy observations with Gemini North.
GCN Circular 5102
Subject
GRB 060510B : Planned XMM-Newton observation
Date
2006-05-10T11:23:34Z (19 years ago)
From
Norbert Schartel at XMM-Newton/ESA <too@xmm.vilspa.esa.es>
XMM-Newton will observe GRB 060510B at location
(RA=15h 56m 29.3s, DEC=+78d 34' 09.4", J2000),
starting at 12:35 UT, on May 10, 2006,
for an exposure of 43000 seconds.
GCN Circular 5103
Subject
GRB060510B : Faulkes North Telescope detection
Date
2006-05-10T11:51:18Z (19 years ago)
From
Andrea Melandri at Liverpool John Moores U <axm@astro.livjm.ac.uk>
A. Melandri, C. Guidorzi, C. Mundell, A. Gomboc, I.A. Steele,
C.J. Mottram, A. Monfardini, S. Kobayashi, R.J. Smith,
M.F. Bode (Liverpool JMU), P. O'Brien, E. Rol, N. Bannister
(Leicester) report:
"The 2-m Faulkes North Telescope robotically followed up
GRB060510B (Krimm et al., GCN 5096) and began observing
2.8 minutes after the GRB trigger time.
We confirm the detection of fading OT at the location
identified by Mirabel et al. (GCN 5097) and Price et al.
(GCN 5101).
The automatic "detection mode" procedure did not detect an
optical afterglow candidate in the XRT error circle (Krimm et al.,
GCN 5096) reported by Mirabal et al. (GCN 5097) in the first
short-exposure R images.
However, following visual inspection of subsequent co-added and
single-frame images, the afterglow was clearly detected and found
to be fading.
We estimate source magnitudes to be i'~20.2 +/- 0.2, at 31
min post trigger, and R~21.0 +/- 0.5 for the co-added image
from 2.8 to 20.2 min after the burst (total exposure time 240 sec).
Further analysis and observation are still ongoing."
GCN Circular 5104
Subject
GRB 060510b: Redshift
Date
2006-05-10T14:18:08Z (19 years ago)
From
Paul Price at IfA,UH <price@ifa.hawaii.edu>
P.A. Price (IfA, Hawaii) reports on behalf of a larger collaboration:
We have observed the optical afterglow of GRB 060510b (GCN #5098) with
the Gemini North telesecope + GMOS. Observations consisted of 2 x 1000
sec exposures with the 400 lines/mm grating, with the source at an
airmass ~ 2. Based on the presence of a strong continuum break around
7250A which we identify as due to Ly alpha, we estimate a redshift of z
= 4.9.
PAP thanks Nestor Mirabal for helpful discussion. We also thank the
Gemini North observing team for performing these observations.
GCN Circular 5107
Subject
GRB 060510B: Swift-BAT Refined Analysis
Date
2006-05-10T19:33:16Z (19 years ago)
From
Hans Krimm at NASA-GSFC <krimm@milkyway.gsfc.nasa.gov>
S. Barthelmy (GSFC), L. Barbier (GSFC), J. Cummings (GSFC/ORAU),
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho),
H. Krimm (GSFC/USRA), M. Koss (GSFC/UMD), C. Markwardt (GSFC/UMD),
D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU),
G. Sato (GSFC/JSPS/USRA), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC),
on behalf of the Swift-BAT team:
Using the data set from T-239.0 to T+423 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 060510B
(trigger #209352) (Krimm, et al., GCN 5096). The BAT
ground-calculated position is (RA,Dec) = 239.215, 78.597 deg
{15h 56m 51.6s, 78d 35' 48.7"} (J2000) +- 1.9 arcmin,
(radius, sys+stat, 90% containment). The partial coding was 96%.
The mask-weighted light curve shows a very long period of emission extending
from T+ ~25 sec to T+ ~330 sec. There are numerous (6-10) overlapping peaks
in the light curve, with the two brightest peaks at T+ ~140 sec
and T+ ~290 sec. T90 (15-350 keV) is 276 +- 10 sec (estimated error
including systematics). This stretched-out emission is consistent
with this burst being at high redshift (z=4.9, Price, GCN 5104).
We have only fragmentary event data after T+423 sec, but the onboard
mask-tagged light curves show no significant emission after this time.
The time-averaged spectrum from T-16.3 sec to T+326.1 sec is best fit by
a simple power-law model. The power law index of the time-averaged spectrum
is 1.76 +- 0.08. The fluence in the 15-150 keV band is
4.2 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured
from T+136.24 sec in the 15-150 keV band is 0.6 +- 0.1 ph/cm2/sec.
All the quoted errors are at the 90% confidence level.
Given a redshift of z=4.9, we compute Eiso to be 2.04 X 10^53 ergs
(88.5 - 885 keV in the rest frame.) This assumes a cosmology with
Omega_M=0.3, Omega_lambda=0.7 and H0=65.
GCN Circular 5109
Subject
GRB 060510B: Swift/UVOT Upper Limits
Date
2006-05-10T20:27:52Z (19 years ago)
From
Stephen Holland at USRA/NASA/GSFC/SSC <sholland@milkyway.gsfc.nasa.gov>
GRB 060510B: Swift/UVOT Upper Limits
S. T. Holland (NASA/GSFC & USRA) reports on behalf of the Swift/UVOT
team:
The Swift UVOT began observing GRB 060510B (trigger #209351,
Krimm et al., GCN Circular 5096) 111 seconds after the BAT trigger.
No optical afterglow is detected at the location of the optical
afterglow (Mirabal & Halpern 2006, GCN Circular 5097). The lack of
detection in any UVOT filter is consistent with the burst having a
redshift of z = 4.9 (Price 2006, GCN Circular 5104).
Midpoint Coadded Upper
Filter Time Exposure Limit
(sec) (sec) (3 sigma)
V 1034 1598 21.2
B 5141 403 21.4
U 4950 433 21.1
UVW1 4736 413 20.6
UVM2 4852 1056 20.9
UVW2 5446 197 19.7
White 479 699 21.9
No correction has been made for the Galactic reddening of to E(B-V) =
0.04 mag (Schlegel et al. 1998) along the line of sight to GRB
GCN Circular 5110
Subject
GRB060510B: Swift XRT refined analysis
Date
2006-05-10T22:07:59Z (19 years ago)
From
Matteo Perri at ISAC/ASDC <perri@asdc.asi.it>
M. Perri, M. Capalbi, M.L. Conciatore, L. Vetere (ASDC),
H.A. Krimm (GSFC/USRA) and D.N. Burrows (PSU) report on behalf
of the Swift/XRT team:
We have analyzed the first four orbits of Swift XRT data on the BAT GRB
060510B (Krimm, et al., GCN 5096; Barthelmy et al., GCN 5107). A 5.3 ks
Photon Counting (PC) mode image gives a refined X-ray position of:
RA(J2000) = 15h 56m 29.9s
Dec(J2000) = +78d 34' 09.7"
with an uncertainty of 3.6 arcsec (90% containment). This is 2 arcmin
away from the center of the refined BAT position quoted in GCN 5107, and
1.8 arcsec away from the initial XRT position reported in GCN 5096.
The early 0.3-10 keV light curve has a complex behavior. The first
orbit of data shows an initial shallow decay with slope ~ -0.3, a temporal
break at about T+350s followed by a steep decay with slope ~ -11. Three
X-ray flares at about T+200s, T+300s and T+880s are also observed during
the first orbit. The afterglow decay between the second and the fourth
orbit has a slope of ~ -0.4.
The X-ray spectrum covering the time period from T+128s to T+456s is
well fit by an absorbed power-law with a photon index of 1.42+/-0.13
and column density of (1.5+/-0.1)e21 cm**-2. We note the Galactic column
density in the direction of the source is 3.8e20 cm**-2. The observed
(unabsorbed) 0.3-10 keV flux for this spectrum is 4.3e-9 (4.9e-9)
erg/cm**2/s. All the quoted errors are at the 90% confidence level.
If the burst continues decaying at the current rate we estimate an XRT
count rate of 6e-3 counts/s at T+24hr, which corresponds to an
unabsorbed 0.3-10.keV flux of 3e-13 ergs cm**-2 s**-1.
This circular is an official product of the Swift XRT Team.
GCN Circular 5157
Subject
XMM-Newton observation of GRB060510b
Date
2006-05-23T14:45:56Z (19 years ago)
From
Sergio Campana at INAF-OAB <sergio.campana@brera.inaf.it>
Sergio Campana (INAF/OAB) and Andrea DeLuca (INAF/IASF
Milano) report:
We have analyzed the XMM-Newton observation of the field
of GRB060510B, discovered by Swift/BAT on May 10 2006,
08:22:14 UT (Krimm et al., GCN 5096).
The XMM-Newton observation started ~5 hours after the
GRB trigger and lasted for ~40 ks. The observation is
affected by a high particle background, resulting in
about 17 ks of usable data.
We report here on data collected by the EPIC/pn camera.
The afterglow of GRB060510B is detected at the following
coordinates:
RA(J2000): 15h 56m 29s.2,
Dec(J2000): +78d 34' 12.0",
with an uncertainty of 1.5 arcsec (1sigma), fully
consistent with the reported Swift/XRT (Krimm et al.)
and optical (Mirabal et al. GCN5097) positions.
Extracting source events from a circle of 30 arcsec
radius, the pn time-averaged, background-subtracted count
rate in the 0.5-8 keV range is of 0.11+/-0.003 cts/s.
The source is clearly fading with a power law decay
with alpha=-0.7+/-0.1 (error at 90% c.l. for a single
parameter) with reduced chi2=1.3, 16 d.o.f.
The time-integrated X-ray spectrum is well fit (reduced
chi2=1.0, 72 d.o.f.) by a power law absorbed by a column
NH=(9.4+/-3.5)x10^20 cm^-2 (error at 90% confidence level),
slightly larger than the Galactic value of NH_gal=3.8x10^20
cm^-2 (Dickey & Lockman 1990), and with a photon index
Gamma=2.7+/-0.3.
Since the redshift of the GRB afterglow is known we consider
also an intrinsic absorption at z=4.9 (Price, GCN5104). The
fit is similarly good (reduced chi2=0.99, 72 d.o.f.) with
NH_z=(2.1+/-1.2)x10^22 cm^-2 and Gamma=2.5+/-0.2.
The observed flux (0.5-10 keV) is of 1.4x10^-13 erg
cm^-2 s^-1, corresponding to an unabsorbed flux of
1.8x10^-13 erg cm^-2 s^-1.
No spectral evolution as a function of time
(first 16 ks vs. remaining 22 ks of data) has been observed.