| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
5:11:31 UTC |
GCN_circulars,Swift Det |
| ra |
318.4840° |
GCN_circulars,Swift Det |
| decl |
62.5780° |
GCN_circulars,Swift Det |
| GBM_located |
False |
|
| mjd |
55017.21633101852 |
GCN_circulars,Swift Det |
| GCN 9615 table |
|---|
| GRB_name |
GRB090705A |
| GCN_number |
9615 |
| Detection_method |
Swift Det |
| t_trigger |
5:11:31 UTC |
| ra |
318.4840° |
| decl |
62.5780° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9615
SUBJECT: GRB 090705: Swift detection of a possible burst
DATE: 09/07/05 05:36:54 GMT
FROM: Scott Barthelmy at NASA/GSFC
T. N. Ukwatta (GSFC/GWU), S. D. Barthelmy (GSFC), V. D'Elia (ASDC),
E. A. Hoversten (PSU), J. A. Kennea (PSU),
C. B. Markwardt (CRESST/GSFC/UMD), C. Pagani (PSU),
D. M. Palmer (LANL), M. Perri (ASDC), T. Sakamoto (NASA/UMBC),
M. H. Siegel (PSU), M. A. Stark (PSU) and G. Stratta (ASDC) report on
behalf of the Swift Team:
At 05:11:31 UT, the Swift Burst Alert Telescope (BAT) triggered and
located possible GRB 090705 (trigger=356516). Swift slewed almost
immediately to the location. The BAT on-board calculated location is
RA, Dec 318.484, +62.578 which is
RA(J2000) = 21h 13m 56s
Dec(J2000) = +62d 34' 42"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). As is usual for an image trigger, there is
no obvious variation in the immediately available light curve.
The XRT began observing the field at 05:17:25.8 UT, 354.7 seconds after
the BAT trigger. No source was detected in the promptly available XRT
data. We are waiting for the full dataset to detect and localise the
XRT counterpart.
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 357 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of
the BAT error circle. The typical 3-sigma upper limit has been about 19.6 mag.
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
0.83.
Due to the marginal detection (7.02 sigma) in the BAT image, and
the non-detection by XRT, we cannot confirm that this is a real burst.
Further analysis will require the full downlink of data through
the Malindi ground station.
Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta AT gmail.com).
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 9616 table |
|---|
| GRB_name |
GRB090705A |
| GCN_number |
9616 |
| Detection_method |
Swift-BAT Det |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9616
SUBJECT: GRB 090705: PAIRITEL NIR Observations
DATE: 09/07/05 07:54:54 GMT
FROM: Adam Morgan at U.C. Berkeley
A. N. Morgan, B. E. Cobb, S. B. Cenko, J. S. Bloom, (UC Berkeley), report:
We observed the field of the possible GRB 090705 (Ukwatta et al., GCN
9615) with the 1.3m PAIRITEL located at Mt. Hopkins, Arizona.
Observations began at 2009-07-05 05:44:53 UT, ~33 minutes after the
Swift trigger. In preliminary mosaics (effective exposure time of
~450 seconds) taken simultaneously in the J, H, and Ks filters, we
detect no new sources inside the BAT error circle down to the 2MASS
limits.
|
| GCN 9617 table |
|---|
| GRB_name |
GRB090705A |
| GCN_number |
9617 |
| Detection_method |
Swift-XRT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 9617
SUBJECT: Possible GRB090705: Swift-XRT observations
DATE: 09/07/05 13:25:13 GMT
FROM: Valerio D'Elia at INAF-OAR
V. D'Elia, M. Perri (ASDC), T.N. Ukwatta (GSFC/GWU) report on behalf
of the Swift-XRT team:
We analyzed the first 2.9 ks of the XRT data for the possible GRB 090705
(Ukwatta et al., GCN Circ. 9615). Data are in Photon Counting (PC) mode
and start ~6 minutes after the BAT trigger.
No source is detected within or near to the BAT error circle. The 3-sigma
upper limit on the count rate is 0.005 count s-1, corresponding to an
approximate observed 0.3-10 keV flux of 2.5x10-13 erg cm-2 s-1 (using a
standard counts to flux conversion factor).
This circular is an official product of the Swift-XRT team.
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