GRB 060515
GCN Circular 5132
Subject
GRB 060515: Swift detection of a burst
Date
2006-05-15T02:51:21Z (19 years ago)
From
Jay R. Cummings at NASA/GSFC/Swift <jayc@milkyway.gsfc.nasa.gov>
J. R. Cummings (NASA/ORAU), S. D. Barthelmy (GSFC),
M. M. Chester (PSU), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU),
K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of
the Swift Team:
At 02:27:52 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 060515 (trigger=210084). Swift did not slew to the burst
because of the earth observing constraint. The BAT on-board calculated
location is RA,Dec 127.287, +73.551 {08h 29m 09s, +73d 33' 03"} (J2000)
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows multiple overlapping
peaks with total duration of ~35 sec. The peak count rate
was ~1000 counts/sec (15-350 keV), at ~5 sec after the trigger.
There will be no XRT or UVOT data products until Swift comes out of the
constraint, at T+52 minutes.
GCN Circular 5133
Subject
GRB 060515: ROTSE-III Optical Limits
Date
2006-05-15T02:55:35Z (19 years ago)
From
Eli Rykoff at U of Michigan/ROTSE <erykoff@umich.edu>
E.S. Rykoff (U Mich), W. Rujopakarn (U Mich), B. E. Schaefer (Louisiana
State), S.A. Yost (U Mich), report on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB
060515 (Swift trigger 210084, GCN 5132), producing images beginning 6.8
s after the GCN notice time. An automated response took the first image
at 02:28:50.7 UT, 57.8 s after the burst, under windy conditions. We
took 10 5-sec and 10 20-sec exposures before clouds came in. These
unfiltered images are calibrated relative to USNO A2.0 (R).
Comparison to the DSS (second epoch) reveals no new sources within the
3-sigma BAT error circle, for both single images and coadding into sets
of 10. Individual images have limiting magnitudes ranging from
13.9-14.9; we set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
02:28:50.7 02:28:55.7 5 14.2 57.8 N
02:28:50.7 02:29:57.9 67 15.6 57.8 Y
GCN Circular 5134
Subject
GRB 060515: TAROT optical observation
Date
2006-05-15T04:06:52Z (19 years ago)
From
Alain Klotz at CESR-CNRS <Alain.Klotz@free.fr>
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 060515 detected by SWIFT
(trigger 210084) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.
First image was acquired 60.0s after the GRB trigger
(9s after the notice). The field elevation decreased from
29 degrees above horizon and weather conditions
were good.
Date of trigger : t0 = 2006-05-15T02:27:53
First image is 60s exposure trailed.
No optical transcient (OT) is visible:
t0+60.0s to t0+120.0s : R > 15.1
Second image is 30s exposure. No OT is visible:
t0+126s to t0+156s : R > 16.2
We co-added a series of all 17 exposures
taken between t0+126s and t0+1497s.
We detect a possible OT candidate R~18
at the position (+/- 5 arcsec):
RA(J2000.0) = 08h 29m 10.42s
DEC(J2000.0) +73d 32' 54.6"
The limiting magnitude of the image is R ~ 18.2.
The OT candidate is very faint and we cannot confirm
it because no more images can be taken because the
twilight occured.
Magnitudes were estimated with the nearby USNO-A2 stars
Galactic coordinates are lon=140.7911 lat=+32.7885
and the galactic extinction in R band is 0.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.
This message may be cited.
GCN Circular 5135
Subject
GRB060515: Swift/UVOT initial observation
Date
2006-05-15T05:44:09Z (19 years ago)
From
Margaret Chester at PSU <chester@astro.psu.edu>
M. M. Chester (PSU), F.E. Marshall (NASA/GSFC) and J. R. Cummings
(NASA/ORAU) report on behalf of the Swift UVOT Team:
Swift/UVOT took a finding chart exposure of nominal 100 seconds with the
White (160-650 nm) filter starting 3385 seconds after the BAT trigger
for GRB 060515 (Cummings, et al., GCN 5132). No reliable afterglow
candidate has been found in the initial data products. The 8'x8' region
for the list of sources generated on-board covers 100% of the BAT error
circle. The list of sources is typically complete to about 18 mag.
No correction has been made for the expected extinction corresponding to
E(B-V) of 0.03.
GCN Circular 5136
Subject
GRB 060515: Super-LOTIS Observations
Date
2006-05-15T06:27:39Z (19 years ago)
From
Peter A. Milne at Super-LOTIS <PMILNE511@prodigy.net>
P.A.Milne and G.G.Williams (Steward Obs) on behalf of the
Super-LOTIS GRB team report:
We observed the field of GRB 060515 with the 0.6m Super-LOTIS telescope
at Kitt Peak, AZ. in response to SWIFT trigger 210084. Due to twilight,
the first usable images were obtained ~30 minutes after the GRB. In a
co-added R-band image produced from eight 60 second exposures, we do
not detect the candidate optical counterpart reported by Klotz, Boer,
& Atteia (GCN 5134) or any other candidate counterpart. The central
time of the co-added image is 03:03 UT (1745 seconds after the GRB)
and the 3-sigma limiting magnitude is 18.1.
This message may be cited.
GCN Circular 5137
Subject
GRB 060515: Swift/XRT position
Date
2006-05-15T06:42:00Z (19 years ago)
From
Kim Page at U.of Leicester <kpa@star.le.ac.uk>
K.L. Page (U Leicester) and J.A. Kennea (PSU) report on behalf of the
Swift/XRT team:
The XRT began observing the field of GRB 060515 (trigger number 210084)
~3.4 ks after the BAT trigger (Cummings et al., GCB 5132), the delay being
caused by the Earth limb constraint. Analysing the first orbit of data
(~2.5 ks of Photon Counting mode data), a faint, uncatalogued source was
found at
RA(J2000) = 08 29 09.8
Dec(J2000) = +73 34 02.4
with an estimated uncertainty of 4.9 arcsec. This source lies 59 arcsec
from the initial BAT position quoted in GCN 5132.
Because there are only a small number of counts, it is not possible to say
for certain whether the source is fading, though there is an indication of
a shallow decay slope.
This circular is an official product of the Swift XRT Team.
GCN Circular 5138
Subject
GRB 060515: Swift/UVOT Upper Limits
Date
2006-05-15T13:17:08Z (19 years ago)
From
Alice Breeveld at MSSL-UCL <aad@mssl.ucl.ac.uk>
A. Breeveld (MSSL/UCL) and J. Cummings (GSFC) report on behalf of the
Swift/UVOT team:
The Swift UVOT began taking data on the field of GRB 060515, 3364s
(including the 10s V settling exposure) after the trigger (trigger
#210084). Swift did not slew immediately after the trigger because of an
earth constrait (Cummings et al., GCN Circular 5132). At the position of
the XRT error circle (Page and Kennea, GCN 5137) there are no new
sources to the following 3 sigma upper limits:
Filter T_range(s) Exp(s) 3sig_UL(mag)
V 3364-11674 1062.4 20.1
B 4309-5893 347.0 20.4
U 4104-5735 393.3 20.2
UVW1 3900-5531 393.3 20.4
UVM2 3695-5326 393.3 20.7
UVW2 4718-10989 1082.2 21.4
White (160-650nm) 3384-10084 1179.9 20.9
These upper limits are uncorrected for the estimated Galactic reddening
of E(B-V) = 0.03 mags.
GCN Circular 5139
Subject
GRB 060515: Swift/XRT Team refined analysis
Date
2006-05-15T13:50:58Z (19 years ago)
From
Kim Page at U.of Leicester <kpa@star.le.ac.uk>
K.L. Page, J.P. Osborne (U. Leicester), J.A. Kennea, A. Cucchiara (PSU) &
J.R. Cummings (NASA/ORAU) report on behalf of the Swift/XRT team:
We have analysed the first 4 orbits of Swift/XRT data of GRB 060515
(trigger number 210084; Cummings et al., GCN 5132), which equates to 9.6
ks between 3.4 ks and 23.2 ks after the trigger.
The source tentatively identified by Page & Kennea in GCN 5137 is found to
be fading, and so is the best candidate for the afterglow. The refined
position is:
RA(J2000) = 08 29 09.5
Dec(J2000) = +73 34 02.82
with an estimated uncertainty of 4.5 arcsec (90% uncertainty). This is 1.3
arcsec from the preliminary XRT given in GCN 5137, but 68.3 arcsec from
the possible optical candidate suggested by TAROT (GCN 5314, Klotz et
al.).
The source is only detected in the first 2 individual orbits of data,
giving a decay slope of alpha = 1.2 +/- 0.6. However, between the 2nd and
3rd orbits, the slope must steepen, since the 3-sigma upper limit on the
count rate (1.4e-3 count s^-1) is well below the extrapolation of alpha =
1.2. Thus, we cannot sensibly predict the flux at 24 hours. However,
between 3.4 ks - 5.9 ks, the 0.3-10 keV observed (unabsorbed) flux was
1.45e-12 (1.51e-12) erg cm^-2 s^-1.
This circular is an official product of the Swift/XRT team.
GCN Circular 5141
Subject
GRB 060515 BAT refined analysis
Date
2006-05-15T17:24:44Z (19 years ago)
From
Jay R. Cummings at NASA/GSFC/Swift <jayc@milkyway.gsfc.nasa.gov>
E. Fenimore (LANL), L. Barbier (GSFC), S. Barthelmy (GSFC),
J. Cummings (GSFC/ORAU), 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 to T+360 sec from recent telemetry
downlinks, we report further analysis of BAT GRB 060515
(trigger #210084) (Cummings, et al., GCN 5132). The BAT ground-
calculated position is
(RA,Dec) = 127.295, 73.562 deg {8h 29m 10.7s, 73d 33' 43.2"} (J2000)
+- 1.5 arcmin, (radius, sys+stat, 90% containment). This position
is 0.7 arcmin from the onboard-calculated position and 0.3 arcmin
from the XRT refined position (Page et al. GCN 5139). The partial
coding was 38%.
The light curve shows a single weak, long FRED peak. T90 (15-350 keV)
is 52 +- 8 sec (estimated error including systematics). There is no
indication of emission in the BAT energy band after T+70. As noted
earlier, Swift did not slew to the burst because of an Earth limb
constraint. At T+140 sec, Swift executed a preplanned slew away from
the burst, which was then in the extreme partially coded field of view,
so constraints on emission are poor. After T+360, Swift entered the
SAA and we have no further information on any possible extended
emission.
The time-averaged spectrum from T+0.2 to T+57.5 is best fit by
a simple power-law model. The power-law index of the time-averaged
spectrum is 1.15 +- 0.15. The fluence in the 15-150 keV band is
1.4 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured
from T+5.58 sec in the 15-150 keV band is 0.8 +- 0.2 ph/cm2/sec. All
the quoted errors are at the 90% confidence level.
GCN Circular 5143
Subject
GRB060515: P200 NIR Observations
Date
2006-05-16T04:20:49Z (19 years ago)
From
S. Bradley Cenko at Caltech <cenko@srl.caltech.edu>
S. B. Cenko (Caltech), T. H. Jarrett (IPAC), and D. B. Fox (Penn State)
report on behalf of a larger collaboration:
We have imaged the field of GRB060515 (Cummings et al., GCN 5132) with the
Wide-Field Infrared Camera mounted on the Palomar 200-inch Hale Telecope.
Observations consisted were taken in the Ks band at a mean time of 04:37
15 May 2006 UT (~ 2.15 hours after the burst). High cirrus clouds
affected the limiting magnitude of our observations.
We find no new sources in the XRT (Page et al, GCN 5139) error circle to a
limiting magnitude of Ks > 16.0 (calculated with respect to several 2MASS
objects in the field). In addition, we see no object at the location of
the possible TAROT afterglow (Klotz, Boer, and Atteia, GCN 5134) to the
same limiting magnitude.
GCN Circular 5148
Subject
GRB 060515: NIR observation
Date
2006-05-19T07:52:04Z (19 years ago)
From
Yuji Urata at Saitama U <urata@crystal.heal.phy.saitama-u.ac.jp>
Y. Urata (Saitama-U), K.Y. Huang, W.H. Ip (NCU)
report on behalf of EAFON team:
"We have imaged the GRB 060515 field (Cummings et al., GCN 5132) with
J and Ks band using CFHT/WIRCam. The observation started from 3.18
hours after the trigger. There is no new sources in the XRT error
circle (Page et al, GCN 5139) to a limiting magnitude of J > 20.0 and
Ks > 18.9 derived from several 2MASS objects in the fields. The
possible TAROT afterglow (Klotz, Boer, and Atteia, GCN 5134) do not
appear in our J and Ks band images to the same limiting magnitude.
----------------------------------------
Time(mid) Exp Filter Limit (SN=3)
----------------------------------------
3.23 h 20s x 7 Ks >18.9
3.34 h 20s x 7 J >20.0
----------------------------------------
We thank Dr. Cabanac, Dr. Loic, Dr. Wang and the staff of QSO team."
This message may be cited.
GCN Circular 5284
Subject
GRB 060515: Upper Limit on Host Galaxy
Date
2006-07-04T19:02:08Z (19 years ago)
From
Alexander Kann at TLS Tautenburg <kann@tls-tautenburg.de>
D. A. Kann (Thueringer Landessternwarte Tautenburg), and S. Manohar (USC/
Los Angeles), report:
We observed the field of GRB 060515 (Cummings et al., GCN 5132) with the
Tautenburg 1.34m Schmidt telescope under good observing conditions. Seeing
and transparency were very good, but sky background was high due to the
moderate distance from the Sun. We obtained 16 x 600 sec images in the Rc
filter for a total integration time of 160 minutes. The mean observation
time was July 2.4928 UT (8 x 600 sec images in one night each), which is
48.39 days after the burst. We determine the zero point of the image in
comparison with nine unsaturated and isolated stars of the USNOB1.0
catalog. Astrometry is also performed against the USNOB1.0 catalog.
At the refined position of the X-ray afterglow (Page et al., GCN 5139), we
do not detect any sources. The 2 sigma limiting magnitude of the image is
Rc=23.6. This magnitude is not corrected for the small foreground
extinction, E(B-V)=0.027.
We detect three sources closeby (positions with errors of 0."5, photometry
errors statistical only):
RA=08:29:10.92, Dec=+73:34:07.70 Rc = 20.19 +\- 0.02 (also in the
USNOB1.0 catalog)
RA=08:29:08.01, Dec=+73:34:09.01 Rc = 22.29 +\- 0.11
RA=08:29:08.29, Dec=+73:33:56.67 Rc = 21.64 +\- 0.06
All three objects are stellar at our plate scale (1."23/pixel).
This message may be cited.