- GCN/BACODINE POSITION NOTICE
TITLE: GCN/INTEGRAL NOTICE
NOTICE_DATE: Thu 22 Apr 04 06:58:19 UT
NOTICE_TYPE: INTEGRAL Wakeup
TRIGGER_NUM: 1756, Sub_Num: 0
GRB_RA: 280.4964d {+18h 41m 59s} (J2000),
280.5508d {+18h 42m 12s} (current),
279.8652d {+18h 39m 28s} (1950)
GRB_DEC: +1.9718d {+01d 58' 19"} (J2000),
+1.9762d {+01d 58' 34"} (current),
+1.9226d {+01d 55' 21"} (1950)
GRB_ERROR: 2.87 [arcmin, radius, statistical only]
GRB_INTEN: 12.32 [sigma]
GRB_TIME: 25085.08 SOD {06:58:05.08} UT
GRB_DATE: 13117 TJD; 113 DOY; 04/04/22
SC_RA: 286.75 [deg] (J2000)
SC_DEC: 8.90 [deg] (J2000)
SUN_POSTN: 30.30d {+02h 01m 11s} +12.34d {+12d 20' 12"}
SUN_DIST: 108.81 [deg]
MOON_POSTN: 60.31d {+04h 01m 15s} +22.72d {+22d 43' 27"}
MOON_DIST: 133.66 [deg]
GAL_COORDS: 33.61, 3.00 [deg] galactic lon,lat of the burst
ECL_COORDS: 281.59, 24.99 [deg] ecliptic lon,lat of the burst
COMMENTS: INTEGRAL GRB Coordinates.
- GCN/BACODINE POSITION NOTICE
TITLE: GCN/INTEGRAL NOTICE
NOTICE_DATE: Thu 22 Apr 04 06:58:23 UT
NOTICE_TYPE: INTEGRAL Wakeup
TRIGGER_NUM: 1757, Sub_Num: 0
GRB_RA: 280.4736d {+18h 41m 54s} (J2000),
280.5280d {+18h 42m 07s} (current),
279.8423d {+18h 39m 22s} (1950)
GRB_DEC: +1.9532d {+01d 57' 12"} (J2000),
+1.9576d {+01d 57' 27"} (current),
+1.9041d {+01d 54' 15"} (1950)
GRB_ERROR: 2.67 [arcmin, radius, statistical only]
GRB_INTEN: 18.19 [sigma]
GRB_TIME: 25087.27 SOD {06:58:07.27} UT
GRB_DATE: 13117 TJD; 113 DOY; 04/04/22
SC_RA: 286.75 [deg] (J2000)
SC_DEC: 8.90 [deg] (J2000)
SUN_POSTN: 30.30d {+02h 01m 11s} +12.34d {+12d 20' 12"}
SUN_DIST: 108.84 [deg]
MOON_POSTN: 60.31d {+04h 01m 15s} +22.72d {+22d 43' 28"}
MOON_DIST: 133.69 [deg]
GAL_COORDS: 33.58, 3.01 [deg] galactic lon,lat of the burst
ECL_COORDS: 281.56, 24.97 [deg] ecliptic lon,lat of the burst
COMMENTS: INTEGRAL GRB Coordinates.
- GCN/BACODINE POSITION NOTICE
TITLE: GCN/INTEGRAL NOTICE
NOTICE_DATE: Thu 22 Apr 04 06:58:25 UT
NOTICE_TYPE: INTEGRAL Wakeup
TRIGGER_NUM: 1758, Sub_Num: 0
GRB_RA: 280.4915d {+18h 41m 58s} (J2000),
280.5459d {+18h 42m 11s} (current),
279.8601d {+18h 39m 26s} (1950)
GRB_DEC: +1.9301d {+01d 55' 48"} (J2000),
+1.9345d {+01d 56' 04"} (current),
+1.8809d {+01d 52' 51"} (1950)
GRB_ERROR: 2.92 [arcmin, radius, statistical only]
GRB_INTEN: 11.47 [sigma]
GRB_TIME: 25085.07 SOD {06:58:05.07} UT
GRB_DATE: 13117 TJD; 113 DOY; 04/04/22
SC_RA: 286.75 [deg] (J2000)
SC_DEC: 8.90 [deg] (J2000)
SUN_POSTN: 30.30d {+02h 01m 11s} +12.34d {+12d 20' 12"}
SUN_DIST: 108.83 [deg]
MOON_POSTN: 60.31d {+04h 01m 15s} +22.72d {+22d 43' 27"}
MOON_DIST: 133.69 [deg]
GAL_COORDS: 33.57, 2.99 [deg] galactic lon,lat of the burst
ECL_COORDS: 281.58, 24.95 [deg] ecliptic lon,lat of the burst
COMMENTS: INTEGRAL GRB Coordinates.
- GCN/BACODINE POSITION NOTICE
TITLE: GCN/INTEGRAL NOTICE
NOTICE_DATE: Thu 22 Apr 04 07:45:27 UT
NOTICE_TYPE: INTEGRAL Offline
TRIGGER_NUM: 1758, Sub_Num: 1
GRB_RA: 280.4984d {+18h 41m 60s} (J2000),
280.5527d {+18h 42m 13s} (current),
279.8672d {+18h 39m 28s} (1950)
GRB_DEC: +1.9914d {+01d 59' 29"} (J2000),
+1.9958d {+01d 59' 45"} (current),
+1.9422d {+01d 56' 32"} (1950)
GRB_ERROR: 2.50 [arcmin, radius, statistical only]
GRB_INTEN: 11.47 [sigma]
GRB_TIME: 25085.07 SOD {06:58:05.07} UT
GRB_DATE: 13117 TJD; 113 DOY; 04/04/22
SC_RA: 286.75 [deg] (J2000)
SC_DEC: 8.90 [deg] (J2000)
SUN_POSTN: 30.30d {+02h 01m 11s} +12.34d {+12d 20' 12"}
SUN_DIST: 108.81 [deg]
MOON_POSTN: 60.31d {+04h 01m 15s} +22.72d {+22d 43' 27"}
MOON_DIST: 133.65 [deg]
GAL_COORDS: 33.63, 3.01 [deg] galactic lon,lat of the burst
ECL_COORDS: 281.59, 25.01 [deg] ecliptic lon,lat of the burst
COMMENTS: INTEGRAL GRB Coordinates.
- red DSS finding chart
ps-file
- GCN notice #2572
S. Mereghetti, D. Gotz (IASF, Milano), J. Borkowski, M. Beck (ISDC) on
behalf of the IBAS Localization Team, S. Shaw and R. Walter on behalf of
the INTEGRAL Science data Centre (ISDC) and the INTEGRAL Science Working
Team report:
An 8 s long GRB has been detected with the INTEGRAL Burst Alert System
(IBAS) on April 22 at 06:58:02 UT. The GRB has been detected with
IBIS/ISGRI in the 15-200 keV band. Its coordinates (J2000) are:
R.A. 18h 42m 00s
Dec. +01deg 59' 29''
with an uncertainty of 2.5 arcmin.
The preliminary peak flux in the 20-200 keV range is about 2.7
photons/cmsq/s (2.5 x 10^-7 erg/cmsq/s) (1 s integration time).
This message can be cited.
- GCN notice #2573
D. Malesani (SISSA, Trieste), D. Fugazza, G. Ghirlanda (INAF, Brera), on
behalf of a larger international collaboration involved in the Swift
mission, report:
We observed the error box of the INTEGRAL GRB040422 (Mereghetti et al.,
GCN 2572), starting 2 hours after the burst. Observations were performed
at ESO-Paranal, with an excellent seeing of ~0.5". Optical photometry
(in the R and I filters) were acquired with VLT+FORS2, while NIR K-band
imaging was performed with VLT+ISAAC. Four exposures were needed to
cover the entire INTEGRAL error box in the infrared.
We find no obvious sources after comparison of our images with the 2MASS
catalog. The limit for the 2MASS is estimated to be K < 14.5 (Skrutskie
2001, AAS #198, 33, 827). We estimate our limiting magnitude to be K =
18.5 based on the 2MASS calibration.
Further observations are planned tonight at ESO, in order to search for
variable sources. Our images are available upon request.
We thank the ESO staff at Paranal, and in particular Nancy Ageorges and
Leonardo Vanzi, for quickly performing the observations.
This message may be cited.
- GCN notice #2574
S.Maeno, E.Sonoda, M.Yamauchi
(University of Miyazaki)
"We have observed the field covering the error box of
GRB 040422 (INTEGRAL trigger 1758; trigger time 07:45:27 UT) with the
unfiltered CCD camera on the 30-cm telescope at University of
Miyazaki.The observation was started 14:06:55 UT on Apl.22.
Observed field of view is 43 arcmin centerd on R.A=18,41,38
Dec=+02,04,20d.
After co-adding a set of 2 images of 30 sec exposures ,
we have compared with the USNO A2.0 catalog . Preliminary analysis
shows there is no new source brighter than 16.94 mag.
in the GRB error box reported by INTEGRAL. "
- GCN notice #2575
A. Henden (USRA/USNO) reports on behalf of the USNO GRB team:
We have acquired shallow BVRcIc all-sky photometry for
a 11x11 arcmin field centered on the INTEGRAL coordinates
(Mereghetti et al. GCN 2572) for GRB040422
with the USNOFS 1.0-m telescope on one marginal night.
Stars brighter than V=12.5 are saturated and
should be used with care. We have placed the photometric data
on our anonymous ftp site:
ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb040422.dat
The astrometry in this file is based on linear plate solutions
with respect to UCAC2. The external errors are less than 100mas.
The estimated external photometric error is about 0.03mag
and will be improved with additional calibration nights
if an afterglow is discovered.
As always, you should check the dates on the .dat file prior to
final publication to get the latest photometry. There is
a README file on the ftp directory to give you information
about the procedures used to calibrate these fields.
- GCN notice #2576
E. Rykoff reports on behalf of the ROTSE collaboration:
The ROTSE-IIIb robotic telescope at McDonald Observatory, Texas,
responded automatically to INTEGRAL Trigger #1756 (GRB040422) within 8 s
of the receipt of the first alert, and 22.1 s after the beginning of the
GRB. Our response sequence consists of 10 5 s exposures, 10 20 s
exposures and 200 60 s exposures, all unfiltered.
As the burst was behind the galactic plane, we expect significant
extinction in our optical passband. Applying the formula from
Finkbeiner, Schlegel and Davis (1998), we expect 4.4 magnitudes of
extinction in the R-band, although they give a caveat that their
calculations "should not be trusted" at galactic latitudes of |b|<5.
Our first 5-s exposure started at 06:58:27.21 UT. We visually compared
our images to the DSS using the revised error circle as reported by
Mereghetti et. al (GCN 2572). We find no objects absent from the DSS to
a limiting magnitude of R ~ 16.5, although field crowding creates
significant source confusion. Coadding our first 10 images, with an
effective exposure time of 110 s, also does not reveal any new objects
to a limiting magnitude of R ~ 17.5.
Furthermore, no objects in the error box varied significantly over the
course of our 3.7 hours of observation.
- GCN notice #2577
GRB040422 : I-band follow-up observation at Lulin Observatory
M.K.Yang, K.Y.Huang, W.H. Ip (NCU)
Y. Urata and T. Tamagawa (RIKEN) report:
" We observed the whole field of INTEGRAL error circle of GRB040422
with 1-m telescope at Lulin Observatory at 16.5 UT April 22 ( about
9.6 hr after the burst). There are four images taken at I band images with
exposure time 300 sec.
There are no new source was found by comparing DSS-II I band
image. The limiting magnitude is 19.7 mag ( SN=3, with USNO-A2.0 red
magnitude).
This message may be cited "
- GCN notice #2578
A.Piccioni, C.Bartolini, A.Guarnieri (Bologna University), P.Ferrero,
G.Pizzichini (IASF-CNR, Sezione di Bologna), and I. Bruni (Bologna
Observatory) report:
We have observed the error box of GRB040422 (INTEGRAL trigger
1758; GCN 2572, Mereghetti et al.) with the 152 cm Loiano Telescope
and the BFOSC camera system on April 22, in non perfect sky
conditions (seeing ~ 2 arcsec).
Two 600s Rc images have been obtained at 23.092 and 23.099 UT
respectively (exposition start epochs).
By comparison of the coadded images with the DSS2 catalog we do
not identify any obvious source.
Our limit magnitude, estimated by PSF photometry, results to be
approx 20.1.
Coadded images, observation log and a short comment can be
retrieved by sftp at ermione.bo.astro.it, username: publicGRB,
password: GRB_bo, directory: GRB040422.
- GCN notice #2580
V.Rumyantsev (CrAO) and A.Pozanenko (IKI) report:
We have observed the error box of GRB 040422 (INTEGRAL trigger 1758,
GCN2572, Mereghetti et. al) with 2.6 m Shajn telescope (F/3.9) at Crimean
Astrophysical Observatory. The observation start (UT) Apr. 22, 23:37 under
poor sky conditions (seeing ~2.5 arcsec).
Several R-images taken between (UT) Apr. 22, 23:37 - Apr. 23, 01:39 with
exposition 120 s of each frame covered 60% of the GRB error box. Comparison
with DSS2 reveals no new objects brighter than limits of DSS2. The limiting
magnitude of co-added images is ~21R.
Combined mosaic image of GRB error box can be found at
http://grb.rssi.ru/GRB040422
This message may be cited
- GCN notice #2581
Y.Qiu and J.Hu (NAOC) report:
We observed the erro box of GRB040422 with the 0.8 m telescope at Xinglong
Observatory, National Astronomical Observatories of China, at 18.24 UT April
22.
Four unfiltered images were taken with exposure time 300s. Comparing with
DSS-II image, we couldn't find any new source in the combined image.
The limiting magnitude of the combined image is about 20.0.
This message may be cited.
- astro-ph/0503688:
Filliatre et al:
Out of the darkness: the infrared afterglow of the INTEGRAL burst GRB
040422 observed with the VLT
Abstract:
GRB 040422 was detected by the INTEGRAL satellite at an angle of only 3 degrees from the Galactic plane.
Analysis of the prompt emission observed with the SPI and IBIS instruments on INTEGRAL are presented. The
IBIS spectrum is well fit by the Band model with a break energy of Eo=56+/-2 keV and Epeak=41+/-3 keV. The
peak flux is 1.8 10^(-7) erg/cm2/s and fluence 3.4 10^(-7) erg/cm2 in the range 20-200 keV. We then present the
observations of the afterglow of GRB 040422, obtained with the ISAAC and FORS 2 instruments at the VLT less
than 2 hours after the burst. We report the discovery of its near-infrared afterglow, for which we give here the
astrometry and photometry. No detection could have been obtained in the R and I bands, partly due to the large
extinction in the Milky Way. We re-imaged the position of the afterglow two months later in the Ks band, and
detected a likely bright host galaxy. We compare the magnitude of the afterglow with a those of a compilation of
promptly observed counterparts of previous GRBs, and show that the afterglow of GRB 040422 lies at the very
faint end of the distribution, brighter only than that of GRB 021211, singled out later and in the optical bands, and
GRB 040924 after accounting for Milky Way extinction. This observation suggests that the proportion of dark
GRBs can be significantly lowered by a more systematic use of 8-m class telescopes in the infrared in the very
early hours after the burst.
- astro-ph/0601567
from 25 Jan 2006
D'Avanzo:
Understanding the reasons for the faintness of the optical/near-infrared
afterglows of the so-called dark bursts is essential to assess whether they
form a subclass of GRBs, and hence for the use of GRBs in cosmology. With VLT
and other ground-based telescopes, we searched for the afterglows of the
INTEGRAL bursts GRB 040223, GRB 040422 and GRB 040624 in the first hours after
the triggers. A detection of a faint afterglow and of the host galaxy in the K
band was achieved for GRB 040422, while only upper limits were obtained for GRB
040223 and GRB 040624, although in the former case the X-ray afterglow was
observed. A comparison with the magnitudes of a sample of afterglows clearly
shows the faintness of these bursts, which are good examples of a population
that an increasing usage of large diameter telescopes is beginning to unveil.
Previous IAU Circulars 