| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
5:33:38 UTC |
GCN_circulars,Swift Det |
| ra |
273.0921° |
Swift |
| decl |
14.2962° |
Swift |
| pos_error |
1.94e-04° |
Swift |
| T90 |
3.5 s |
Swift |
| T90_start |
5:33:38 UTC |
Swift |
| fluence |
3.00e-07 erg/cm² |
Swift |
| T100 |
3.5 s |
|
| GBM_located |
False |
|
| mjd |
55997.23168981481 |
GCN_circulars,Swift Det |
| IPN table |
|---|
| GRB_name |
GRB120311A |
| ra |
273.0875° |
| decl |
14.2833° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB120311A |
| t_trigger |
5:33:38 UTC |
| ra |
273.0921° |
| decl |
14.2962° |
| pos_error |
1.94e-04° |
| T90 |
3.5 s |
| fluence |
3.00e-07 erg/cm² |
| GCN 13032 table |
|---|
| GRB_name |
GRB120311A |
| GCN_number |
13032 |
| Detection_method |
Swift Det |
| t_trigger |
5:33:38 UTC |
| ra |
273.0870° |
| decl |
14.2750° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 13032
SUBJECT: GRB 120311A: Swift detection of a burst
DATE: 12/03/11 05:42:58 GMT
FROM: Scott Barthelmy at NASA/GSFC
C. B. Markwardt (NASA/GSFC), S. D. Barthelmy (GSFC),
M. M. Chester (PSU), J. R. Cummings (NASA/UMBC),
P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. Melandri (INAF-OAB),
D. M. Palmer (LANL), M. H. Siegel (PSU) and
M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift Team:
At 05:33:38 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 120311A (trigger=517469). Swift did not slew because of
the Earth limb observing constraint.
The BAT on-board calculated location is
RA, Dec 273.087, +14.275, which is
RA(J2000) = 18h 12m 21s
Dec(J2000) = +14d 16' 32"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows a single peak
structure with a duration of about 6 sec. The peak count rate
was ~5100 counts/sec (15-350 keV), at ~0 sec after the trigger.
Due to an observing constraint, Swift will not slew until T0+50.1
minutes. There will be no XRT or UVOT data until this time.
Burst Advocate for this burst is C. B. Markwardt (Craig.Markwardt AT nasa.gov).
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 13033 table |
|---|
| GRB_name |
GRB120311A |
| GCN_number |
13033 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 13033
SUBJECT: GRB 120311A: Liverpool Telescope optical candidate
DATE: 12/03/11 06:49:39 GMT
FROM: Andrea Melandri at INAF-OAB
A. Melandri (INAF-OAB), C. Guidorzi (U. Ferrara), F. Virgili (LJMU),
on behalf of a larger collaboration report:
"The 2-m Liverpool Telescope robotically followed up GRB 120311A
(SWIFT trigger 517469, Markwardt et al., GCN 13032) 14.4 min after the
GRB trigger time. The automatic "detection mode" procedure detected an
uncatalogued afterglow candidate close to the XRT error circle (7
arcsec from its centroid) at:
18:12:22.166 +14:17:46.3 (J2000)
with magnitude R = 19.1 mag (vs USNOB1) 16 min after the burst.
Observations and analysis are ongoing.
|
| GCN 13034 table |
|---|
| GRB_name |
GRB120311A |
| GCN_number |
13034 |
| Detection_method |
Swift-XRT Other |
| ra |
273.0897° |
| decl |
14.2971° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 13034
SUBJECT: GRB 120311A: Swift-XRT observations
DATE: 12/03/11 07:29:52 GMT
FROM: Phil Evans at U of Leicester
P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), D.N. Burrows
(PSU), J.A. Kennea (PSU), M. Perri (ASDC) and G. Tagliaferri (INAF-OAB)
report on behalf of the Swift-XRT team:
The XRT began observing the field of GRB 120311A at 06:26:19.9 UT,
3161.6 seconds after the BAT trigger. Using promptly downlinked data we
find an uncatalogued X-ray source located at RA, Dec 273.08966,
14.29709 which is equivalent to:
RA(J2000) = 18h 12m 21.52s
Dec(J2000) = +14d 17' 49.5"
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This
location is 80 arcseconds from the BAT onboard position, within the BAT
error circle. This position may be improved as more data are received;
the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event
data gives a column density in excess of the Galactic value (1.03 x
10^21 cm^-2, Kalberla et al. 2005), with an excess column of 2.5
(+2.12/-1.86) x 10^21 cm^-2 (90% confidence).
|
| GCN 13035 table |
|---|
| GRB_name |
GRB120311A |
| GCN_number |
13035 |
| Detection_method |
Swift-XRT Det |
| ra |
273.0920° |
| decl |
14.2964° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 13035
SUBJECT: GRB 120311A: Enhanced Swift-XRT position
DATE: 12/03/11 12:15:15 GMT
FROM: Phil Evans at U of Leicester
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester)
report on behalf of the Swift-XRT team.
Using 762 s of XRT Photon Counting mode data and 2 UVOT
images for GRB 120311A, we find an astrometrically corrected X-ray
position (using the XRT-UVOT alignment and matching UVOT field sources
to the USNO-B1 catalogue): RA, Dec = 273.09198, +14.29643 which is equivalent
to:
RA (J2000): 18h 12m 22.08s
Dec (J2000): +14d 17' 47.2"
with an uncertainty of 2.6 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest
position can be viewed at http://www.swift.ac.uk/xrt_positions. Position
enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans
et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the
Swift-XRT team.
|
| GCN 13036 table |
|---|
| GRB_name |
GRB120311A |
| GCN_number |
13036 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 13036
SUBJECT: GRB 120311A: CAHA 1.23m I-band early observations
DATE: 12/03/11 13:58:08 GMT
FROM: Javier Gorosabel at IAA-CSIC
P. Kubanek, M. Jelinek, J. Gorosabel (IAA-CSIC), report on behalf of a larger collaboration:
"The 1.23m CAHA telescope responded automatically to GRB 120311A (trigger=517469, Markwardt et al. GCN 13032) starting optical observations on March 11.23381 UT (~3.05 minutes after the trigger). The optical afterglow (Melandri et al. GCNC 13033) is clearly detected in two I-band frames taken before dawn at I ~ 17.3."
|
| GCN 13037 table |
|---|
| GRB_name |
GRB120311A |
| GCN_number |
13037 |
| Detection_method |
Swift-UVOT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 13037
SUBJECT: GRB 120311A: Swift/UVOT Upper Limits
DATE: 12/03/11 15:16:25 GMT
FROM: Patricia Schady at MPE/Swift
S. R. Oates (MSSL-UCL) and C. B. Markwardt (NASA/GSFC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120311A
3164 s after the BAT trigger (Markwardt et al., GCN Circ. 13032).
No optical afterglow, consistent with the refined XRT position
(Goad et al .,GCN Circ 13035) or optical position reported by the
Liverpool Telescope (Melandri et al., GCN Circ 13033), is detected within
the initial UVOT exposures. Preliminary 3-sigma upper limits using
the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373)
for the first finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 3164 3314 147 >16.4
white 3164 16486 2114 >16.5
v 3321 20754 1454 >15.8
b 4141 15574 1224 >16.4
u 3936 5571 393 >16.3
w1 3731 5366 393 >17.7
m2 3526 5161 393 >19.0
w2 4552 17272 1850 >19.2
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.13 in the direction of the burst
(Schlegel et al. 1998).
|
| GCN 13039 table |
|---|
| GRB_name |
GRB120311A |
| GCN_number |
13039 |
| Detection_method |
Swift-BAT Det |
| ra |
273.0750° |
| decl |
14.2970° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 13039
SUBJECT: GRB 120311A, Swift-BAT refined analysis
DATE: 12/03/11 16:07:19 GMT
FROM: Craig Markwardt at NASA/GSFC
M. Stamatikos (OSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS),
J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 120311A (trigger #517469)
(Markwardt, et al., GCN Circ. 13032). The BAT ground-calculated position is
RA, Dec = 273.075, 14.297 deg which is
RA(J2000) = 18h 12m 18.1s
Dec(J2000) = +14d 17' 49.0"
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 71%.
The mask-weighted light curve shows a single gradual-rise exponential-decay
peak. T90 (15-350 keV) is 3.5 +- 0.8 sec (estimated error including systematics).
The time-averaged spectrum from T-1.38 to T+3.22 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
2.30 +- 0.15. The fluence in the 15-150 keV band is 3.0 +- 0.3 x 10^-07 erg/cm2.
The 1-sec peak photon flux measured from T-0.07 sec in the 15-150 keV band
is 3.2 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence
level.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/517469/BA/
|
| GCN 13043 table |
|---|
| GRB_name |
GRB120311A |
| GCN_number |
13043 |
| Detection_method |
Swift-XRT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 13043
SUBJECT: GRB 120311A: Swift-XRT refined Analysis
DATE: 12/03/11 22:58:04 GMT
FROM: Andrea Melandri at INAF-OAB
A. Melandri (INAF/OAB), P. D'Avanzo (INAF/OAB) and C. B. Markwardt
(NASA/GSFC) report on behalf of the Swift-XRT team:
We have analysed 15 ks of XRT data for GRB 120311A (Markwardt et al.
GCN Circ. 13032), from 3.2 ks to 34.5 ks after the BAT trigger. The
data are entirely in Photon Counting (PC) mode. The enhanced XRT
position for this burst was given by Goad et al. (GCN. Circ 13035).
The late-time light curve (from T0+3.2 ks) can be modelled with a
single power-law decay with a decay index of alpha=1.09 (+0.13,-0.12).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.03 (+0.27, -0.25). The
best-fitting absorption column is 2.6 (+0.9, -0.8) x 10^21 cm^-2, in
excess of the Galactic value of 1.0 x 10^21 cm^-2 (Kalberla et al.
2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion
factor deduced from this spectrum is 4.0 x 10^-11 (6.2 x 10^-11) erg
cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 2.6 (+0.9, -0.8) x 10^21 cm^-2
Galactic foreground: 1.0 x 10^21 cm^-2
Excess significance: 3.2 sigma
Photon index: 2.03 (+0.27, -0.25)
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00517469.
This circular is an official product of the Swift-XRT team.
|
| GCN 13048 table |
|---|
| GRB_name |
GRB120311A |
| GCN_number |
13048 |
| Detection_method |
GROND |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 13048
SUBJECT: GROND observations of GRB 120311A
DATE: 12/03/12 15:19:16 GMT
FROM: Vladimir Sudilovsky at MPE
V. Sudilovsky, T. Prinz, and J. Greiner (all MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 120311A (Markwardt et al., GCN #13032)
simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP, 120, 405)
mounted at the 2.2 m MPI/ESO telescope at La Silla Observatory (Chile).
Observations centered on the BAT position started on March 11, 2012, at
08:02 UT, 2.5h after the GRB trigger. They were performed at an average
seeing of 1.0", and average airmass of 1.8.
Based on a 20 minute exposure centered at 09:09 UT, the afterglow candidate
reported by Melandri et al. (GCN 13033) is measured as follows (all in the AB
system and calibrated against GROND zeropoints (g'r'i'z') and 2MASS (JHK)):
g' = 22.9 +/- 0.3
r' = 22.5 +/- 0.1
i' = 22.4 +/- 0.1
z' = 22.0 +/- 0.1
J > 20.5
H > 19.6
K > 18.0
These above magnitudes have not been corrected for the Galactic extinction of
E(B-V) = 0.13 towards the direction of the burst (Schlegel et al. 1998).
These magnitudes imply a fading of more than two magnitudes relative to the
observations reported by Melandri et al. (GCN 13033), and thus confirm
the afterglow nature of this object.
|
| GCN 13051 table |
|---|
| GRB_name |
GRB120311A |
| GCN_number |
13051 |
| Detection_method |
Optical |
| ra |
273.0909° |
| decl |
14.2902° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 13051
SUBJECT: GRB 120311A: VLT/X-shooter observations
DATE: 12/03/12 19:24:15 GMT
FROM: Paul Vreeswijk at U of Iceland
Paolo D'Avanzo (INAF/OAB), Bo Milvang-Jensen (DARK/NBI), Paul
Vreeswijk (U. Iceland), Nial Tanvir (U. Leicester), Daniele Malesani
(DARK/NBI), Paolo Goldoni (APC/U. Paris 7 and SAp/CEA), Lex Kaper
(U. Amsterdam), Stefano Covino (INAF/OAB) and Johan Fynbo (DARK/NBI)
report on behalf of a larger collaboration:
The optical afterglow (Melandri et al., GCN 13033) of the Swift GRB
120311A (Markwardt et al., GCN 13032; Evans et al., GCN 13034) was
observed spectroscopically with VLT/X-shooter, starting on 2012 March
11.384 UT (3.65 hours after the GRB trigger). An exposure of 2400
seconds was secured, which ran well into morning twilight. The
approximate X-shooter wavelength range is 0.3-2.5 micron. The seeing
during the observations was about 0.8" in the optical, and the
spectrum has a resulting resolving power of 5000 in the ultraviolet
and near-infrared arms, and around 9000 in the optical.
The reduced spectrum shows a very weak continuum in all three
arms. The very low signal-to-noise ratio prevents us from identifying
any significant absorption or emission lines. From the detection of
continuum flux down to roughly 3700 Angstrom we set an upper limit to
the GRB 120311A redshift of approximately z < 3.
Using acquisition images preceding the spectrum, with a mid-exposure
time of March 11.373 UT (3.40 hours after the GRB), we measure R =
21.57 +- 0.05 for the afterglow, assuming R=18.30 for the USNO-B1.0
star 1042-0333539 at RA = 18:12:21.82, Dec = +14:17:24.6.
We are grateful for the support of the ESO staff at Paranal, in
particular that of Gabriel Brammer and Stan Stefl.
|
| GCN 13058 table |
|---|
| GRB_name |
GRB120311A |
| GCN_number |
13058 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 13058
SUBJECT: GRB 120311A: C88 optical limits
DATE: 12/03/13 12:45:03 GMT
FROM: Simone Leonini at Monarrenti Obs
Simone Leonini and Paolo Rosi (Montarrenti Observatory, Siena, Italy)
report:
We observed the field of GRB 120311A (Swift trigger 517469, Markwardt et al.,
GCN 13032) with 0.53m RC telescope + U47 detector at Montarrenti Observatory
(Siena, Italy, IAU code C88).
The observations were performed in four sessions (~22 hours after the
trigger):
from 2012-03-12 03:22:33 UT to 2012-03-12 03:23:15 UT
from 2012-03-12 04:16:03 UT to 2012-03-12 04:16:46 UT
from 2012-03-12 04:18:09 UT to 2012-03-12 04:18:52 UT
from 2012-03-12 04:20:16 UT to 2012-03-12 04:20:59 UT
Eight unfiltered images of 40s exposure were obtained.
We do not detect any new point source in the coadded images (limit R~19.1,
USNO-B1 catalogue) within the refined XRT error circle (Goad et al.,GCN Circ
13035) or in the afterglow candidate position reported by Melandri et al.
(GCN Circ 13033). Observations were made on the twilight.
|
| GCN 13060 table |
|---|
| GRB_name |
GRB120311A |
| GCN_number |
13060 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 13060
SUBJECT: GRB 120311A: Optical follow-up
DATE: 12/03/13 14:09:33 GMT
FROM: Shashi Bhushan Pandey at ROTSE
Vijay Kumar Bhatt, Brajesh Kumar and S.B. Pandey (ARIES,
Nainital, India, on behalf of larger Indian GRB collaboration)
We imaged the field of GRB120311A (Swift trigger 517469, Markwardt
et al., GCN 13032) using 1.04m and 1.3m telescopes at ARIES Nainital
starting ~16 hours after the burst. Several sets of 300s exposures
were taken in R_c and I_c pass-bands.
We do not detect the optical afterglow candidate (Melandri et al.,
GCN 13033) in our stacked images to following limits. The photometry
was performed in comparison to nearby USNO-B1 stars.
Filter Exposure Limiting mag
----------------------------------
R_c 5x300s 20.0 mag
I_c 5x300s 19.5 mag
----------------------------------
This massage could be cited.
|
| GCN 13063 table |
|---|
| GRB_name |
GRB120311A |
| GCN_number |
13063 |
| Detection_method |
Other |
| ra |
273.0920° |
| decl |
14.2964° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 13063
SUBJECT: GRB 120311A, the review of the sky area in plate archives
DATE: 12/03/13 20:44:54 GMT
FROM: Valentyna Golovnya at Main Astro Obs,Kyiv
V.V.Golovnya (Main Astro Obs, Kyiv)
report:
We have undertaken the review of the sky area in vicinity of
GRB 120311A (M.R. Goad et al. GCN Circ.13035) on
astronegatives, collected in Ukrainian NAS Main astronomical
observatory plate archive (1976-1996). All the plates with
the possible object appearance are digitized using Microtek
ScanMaker 9800XL TMA and Epson Expression 10000XL flatbed
scanners and have been placed into Golosiiv Plate Archive
database DBGPA with open access to them.
The list of plates is given in the table:
YYYYMMDD/TimeUT --Plates-- Exp. LimMag Star USNOA2
19840817/191914 GUA040C002619 40.1 14.50 0975-10768885
19840817/191917 GUA040D002620 40.1 14.50 0975-10768885
19860613/221841 GUA040C002948 41.7 16.20 0975-10753116
19860613/221846 GUA040D002949 41.7 15.95 0975-10751623
19870630/215915 GUA040C003102 50.5 16.20 0975-10753116
19900627/221058 GUA040C001669 19.0 16.20 0975-10753116
19900628/215100 GUA040C001976 18.0 16.20 0975-10753116
19910619/224921 GUA040C001815 18.0 14.75 0975-10758776
19910704/210331 GUA040C001818A 25.0 15.95 0975-10751623
Plates: the plates archive identifier of DWA (D/F=400/2000,
GUA040C, M=103"/mm) of the Ukrainian NAS Main Astro obs.
GUA040D (Marsden's number - 83) the plate number [1].
Exp. - Duration of the maximum exposure (minutes).
LimM - Limited V mag, derived in the 25 minutes area around
the location given in M.R. Goad et al. GCN Circ.13035:
RA(J2000)= 18h 12m 22.08s, Dec(J2000)= +14d 17' 47.2"
Star USNOA2 - Comparison star.
The preview images of 9 areas together with
the 25x25 min.of arc area from SkyMap can be found in
http://gua.db.ukr-vo.org/img/grb/120311A/index.html
The images with full resolution are available via e-mail on
demand.
References:
1.L.Pakuliak DATABASE of GOLOSIIV PLATE ARCHIVE (DBGPA V2.0),
http://gua.db.ukr-vo.org
|