GRB 100909A
GCN Circular 11260
Subject
GRB 100909A: a long GRB detected by INTEGRAL
Date
2010-09-09T10:22:05Z (15 years ago)
From
Sandro Mereghetti at IASF/CNR <sandro@iasf-milano.inaf.it>
S.Mereghetti, A.Paizis (IASF- Milano), D.Gotz (CEA-Saclay), E. Bozzo, C.
Ricci, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf
of the IBAS Localization Team report:
a gamma ray burst lasting about 60 s has been detected by IBAS in the
IBIS/ISGRI data at 09:04 U.T. on September 9th. The detection
significance was slightly below the threshold for automatic alert
delivery.
Its refined coordinates (J2000) are:
RA: 73.9506 [degrees]
DEC: 54.6544 [degrees]
with an uncertainty of 2 arcmin (90% c.l.).
A preliminary analysis gives a 20-200 keV fluence of about 10e-6 erg/cmsq.
A plot of the light curve will be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html
This message can be cited.
GCN Circular 11261
Subject
GRB 100909A: Swift target of opportunity observation
Date
2010-09-09T13:04:56Z (15 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@astro.psu.edu>
M. H. Siegel (PSU), S. D. Barthelmy (GSFC), M. M. Chester (PSU),
P. A. Evans (U Leicester), J. M. Gelbord (PSU), J. A. Kennea (PSU),
K. L. Page (U Leicester) and R. L. C. Starling (U Leicester) report on
behalf of the Swift Team:
Swift began a target of opportunity observation of GRB 100909A
on September 9, 2010 at 12:18 UT, approximately 3.2 hours
after the burst was detected by INTEGRAL. Swift data for these
observations utilize Target ID 20147.
The XRT began observing the field at 12:19:37.4 UT, 11.7 ks after the
INTEGRAL trigger. In 1.8 ks of promptly downlinked data there is a faint source,
detected at the 3.2-sigma level at: RA, Dec= 73.94797, +54.65798 which is
equivalent to:
RA (J2000) : 04h 55m 47.51s
Dec (J2000): +54d 39' 28.7''
with an estimated uncertainty of 6 arcsec (radius, 90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White
filter starting 11687 seconds after the INTEGRAL trigger. No credible
afterglow candidate has been found in the initial data products. The
2.7'x2.7' sub-image covers 44% of the INTEGRAL error circle and 100%
of the XRT error circle. The typical 3-sigma upper limit has been
about 19.6 mag. The coverage of the INTEGRAL and XRT error circles by
the 8'x8' region for the list of sources generated on-board is
uncertain because the large number of sources filled the available
telemetry. No correction has been made for the expected extinction
corresponding to E(B-V) of 0.51.
Burst Advocate for this burst is M. H. Siegel (siegel AT astro.psu.edu).
Please contact the BA by email if you require additional information
regarding Swift followup of this burst. In extremely urgent cases, after
trying the Burst Advocate, you can contact the Swift PI by phone (see
Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular 11263
Subject
GRB 100909A: Planned XMM-Newton observation
Date
2010-09-09T14:08:46Z (15 years ago)
From
Norbert Schartel at XMM-Newton/ESA <too@xmm.esac.esa.int>
XMM-Newton will observe GRB 100909A at location
(RA=4h 55m 48s, DEC=+54d 39' 15", J2000),
starting at 04:30 UT, on September 10, 2010,
for an exposure of 31000 seconds.
================================================================================================
This message and any attachments are intended for the use of the addressee or addressees only.
The unauthorised disclosure, use, dissemination or copying (either in whole or in part) of its content is prohibited.
If you received this message in error, please delete it from your system and notify the sender.
E-mails can be altered and their integrity cannot be guaranteed.
ESA shall not be liable for any e-mail if modified.
=================================================================================================
GCN Circular 11264
Subject
GRB 100909A: ROTSE-III Optical Limits
Date
2010-09-09T14:29:13Z (15 years ago)
From
Brad Schaefer at LSU <schaefer@grb.phys.lsu.edu>
B. E. Schaefer (Louisiana State) reports on behalf of the ROTSE
collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB
100909A (INTEGRAL trigger 6060; Mereghetti et al., GCN 11260), producing
images beginning 6.4 s after the GCN notice time. An automated response
took the first image at 10:41:45.5 UT, 5811.6 s after the burst. For the
first 20 minutes the conditions were partly cloudy with occassional holes,
but after 11:02 UT the sky became clear and excellent. We took 10 5-sec,
10 20-sec and 116 60-sec exposures. 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 INTEGRAL/IBIS error circle, for both single images and coadding
into sets of 10. The Swift XRT team reports that a faint X-ray source is
visible at 12:19 UT (Siegel et al. 2010, GCN 11261), and we have also
closely examined this error circle, again finding no variable star or
object of interest. The Swift XRT position is not crowded, although there
is one fairly faint star in it. Individual images have limiting magnitudes
ranging from 12.8-17.6; we set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
10:44:07.5 10:45:25.7 78 15.7 5953.6 Y
11:02:58.7 11:07:40.0 281 18.5 7084.8 Y
GCN Circular 11265
Subject
GRB 100909A: Faulkes Telescope North afterglow candidate
Date
2010-09-09T14:58:36Z (15 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
C. Guidorzi (U. Ferrara), Z. Cano, D. Bersier (LJMU),
P. O'Brien (U. Leicester) report on behalf of a large collaboration:
The Faulkes Telescope North automatically began observing INTEGRAL
GRB 100909A (Mereghetti et al. GCN Circ. 11260) on September 09,
10:42:34 UT, 1.6 hours from the GRB trigger time.
Within the Swift-XRT error circle (Siegel et al. GCN Circ. 11261)
we identify an uncatalogued, possibly fading object at the following
position:
RA(J2000.0): 04:55:47.86
Dec(J2000.0): +54:39:32.1
with the following magnitudes:
Mid Time from Exposure Filter Magnitude
GRB (hours) (s)
-------------------------------------------------------
2.07 540 R 21.6 +- 0.2
2.16 520 i 20.6 +- 0.1
5.05 1200 R 22.1 +- 0.2
-------------------------------------------------------
Calibration was done against the nearby USNOB-1 star
RA,DEC=04:55:49.14, +54:39:42.66, assuming R2=16.82, I=16.06.
We note that the uncatalogued source lies 3" from a
USNOB-1 object with R2=18.54.
GCN Circular 11268
Subject
GRB 100909A: Swift-XRT refined analysis
Date
2010-09-10T03:35:20Z (15 years ago)
From
Jonathan Gelbord at PSU/Swift <jgelbord@astro.psu.edu>
J. M. Gelbord (PSU) and M. H. Siegel (PSU) report on behalf of the
Swift-XRT team:
We have analysed 7.7 ks of XRT data for GRB 100909A (Mereghetti et al.,
GCN Circ. 11260; Siegel et al., GCN Circ. 11261), from 11.8 ks to
25.8 ks after the Integral trigger. The data are entirely in Photon
Counting (PC) mode. Using 1953 s of PC mode data and 1 UVOT images,
we find an enhanced XRT position (using the XRT-UVOT alignment and
matching UVOT field sources to the USNO-B1 catalogue): RA, Dec =
73.94760, +54.65970 which is equivalent to:
RA (J2000): 04 55 47.42
Dec(J2000): +54 39 34.8
with an uncertainty of 5.4 arcsec (radius, 90% confidence).
The X-ray light curve appears to be fading, although we note that the
evidence is limited by the small number of counts in the XRT data
(approximately 60 counts spread over three orbits). When modelled with
a power-law decay, the best-fitting decay index is alpha=1.2 (+1.1,
-1.0).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.5 (+0.8, -0.7). The best-
fitting absorption column is 4.8 (+3.4, -2.6) x 10^21 cm^-2, consistent
with the Galactic value of 2.8 x 10^21 cm^-2 (Kalberla et al. 2005).
The time-averaged 0.3-10 keV flux observed (unabsorbed) is 2.8 x 10^-13
(7.1 x 10^-13) erg cm^-2 s^-1. The counts to observed (unabsorbed)
0.3-10 keV flux conversion factor deduced from this spectrum is
4.4 x 10^-11 (1.1 x 10^-10) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of
1.2, the count rate at T+24 hours will be 1.1 x 10^-3 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of
4.2 x 10^-14 (1.2 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00020147.
This circular is an official product of the Swift-XRT team.
GCN Circular 11269
Subject
GRB100909A: NOT optical afterglow confirmation
Date
2010-09-10T05:38:48Z (15 years ago)
From
Martin Jelinek at Inst.Astrophys.Andalucia,Granada <mates@iaa.es>
Martin Jelinek, Javier Gorosabel (IAA-CSIC) and Sergio Simon
(IAC-ULL) report on behalf of a larger colaboration:
"We observed the optical afterglow of GRB100909A (Mereghetti
et al. GCNC11260; Siegel et al. GCNC11261; Guidorzi et al.
GCNC 11265) with the 2.56m Nordic Optical Telescope equipped
with ALFOSC, starting on September 10 at 4:30 UT (i.e. 19.4h
after the burst).
A preliminary analysis of the 600-s R-band exposure shows the
proposed afterglow with magnitude R~23.2 in respect to the
R2=18.54 object mentioned by Guidorzi et al. (GCNC11265).
This implies a decay rate alpha~1.6, and confirms the fading
nature of the object.
This message may be cited."
GCN Circular 11272
Subject
GRB 100909A: Swift/UVOT observations
Date
2010-09-10T21:19:23Z (15 years ago)
From
Massimiliano de Pasquale at MSSL-UCL <mdp@mssl.ucl.ac.uk>
M. De Pasquale (MSSL-UCL) and M. H. Siegel (PSU) report, on behalf
of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of
GRB 100909A 11747 s after the INTEGRAL trigger (Mereghetti et
`al.,GCN Circ. 11260). Data summed from the first and second orbits
do not reveal a source at the enhanced position of the X-ray
afterglow (Gelbold et al., GCN Circ. 11268).
The 3-sigma upper limits f are reported below:
FILTER T_start(s) T_stop Exposure Mag/3UL
========================================================
wh 11747 25861 1809 >21.9
v 14755 18362 894 >20.21
b 11906 44659 1770 >21.48
u 33619 34527 885 >20.84
w1 19275 20040 752 >20.39
w2 13732 14301 561 >20.33
=======================================================
The above magnitudes are not corrected for the strong Galactic
extinction corresponding to a reddening of E_{B-V} = 0.51 (Schlegel
et al., 1998, ApJS, 500, 525). The photometry is on the UVOT
photometric system described in Poole et al. (2008, MNRAS, 383, 627).
GCN Circular 11273
Subject
GRB100909A: MITSuME Ishigakijima Optical upper limits
Date
2010-09-12T01:13:44Z (15 years ago)
From
Daisuke Kuroda at OAO/NAOJ <dikuroda@oao.nao.ac.jp>
D. Kuroda (OAO, NAOJ), H. Hanayama, T. Miyaji, J. Watanabe (IAO, NAOJ),
K. Yanagisawa (OAO, NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto)
and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 100909A (Mereghetti et al., GCN 11260)
with the optical three color (g', Rc and Ic) CCD camera attached
to the Murikabushi 1m telescope of Ishigakijima Astronomical
Observatory.
The observation started on 10 16:05:58 UT (~1.3 days after the INTEGRAL
trigger). We could not detect the previously reported afterglow
(Siegel et al., GCNC 11261; Guidorzi et al., GCN 11265;
Gelbord and Siegel, GCN 11268; Jelinek et al., GCN 11269) in all the
three bands.
Three sigma upper limits of the OT are listed below. We used GSC2.3
catalog for flux calibration.
T0+[day] MID-UT T-EXP[sec] g' Rc Ic
------------------------------------------------------
1.31686 16:41:10 960.0 >21.3 >20.9 >20.0
------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]