- GCN/BACODINE POSITION NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sat 16 Apr 05 22:51:41 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 114797, Seg_Num: 0
GRB_RA: 133.853d {+08h 55m 25s} (J2000),
133.925d {+08h 55m 42s} (current),
133.172d {+08h 52m 41s} (1950)
GRB_DEC: +11.173d {+11d 10' 23"} (J2000),
+11.153d {+11d 09' 10"} (current),
+11.365d {+11d 21' 53"} (1950)
GRB_ERROR: 4.00 [arcmin radius, statistical only]
GRB_INTEN: 4483 [cnts] Peak=134 [cnts/sec]
TRIGGER_DUR: 0.512 [sec]
TRIGGER_INDEX: 127 E_range: 50-350 keV
BKG_INTEN: 47381 [cnts]
BKG_TIME: 81344.00 SOD {22:35:44.00} UT
BKG_DUR: 8 [sec]
GRB_DATE: 13476 TJD; 106 DOY; 05/04/16
GRB_TIME: 81354.11 SOD {22:35:54.11} UT
GRB_PHI: -153.15 [deg]
GRB_THETA: 53.18 [deg]
SOLN_STATUS: 0x3
RATE_SIGNIF: 25.57 [sigma]
IMAGE_SIGNIF: 8.00 [sigma]
MERIT_PARAMS: +1 +0 +0 +0 +3 +10 -5 +0 +27 +1
SUN_POSTN: 25.08d {+01h 40m 20s} +10.41d {+10d 24' 51"}
SUN_DIST: 106.06 [deg]
MOON_POSTN: 124.08d {+08h 16m 20s} +25.14d {+25d 08' 22"}
MOON_DIST: 16.81 [deg]
MOON_ILLUM: 53 [%]
GAL_COORDS: 216.87, 32.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 133.11, -5.95 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Coordinates.
COMMENTS: This is a rate trigger.
COMMENTS: A point_source was found.
COMMENTS: This does not match any source in the on-board catalog.
COMMENTS: This does not match any source in the ground catalog.
COMMENTS: This is a GRB.
- red DSS finding chart
ps-file
- GCN/SWIFT NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sat 16 Apr 05 22:51:56 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 114797, Seg_Num: 0
GRB_RA: 133.853d {+08h 55m 25s} (J2000),
133.925d {+08h 55m 42s} (current),
133.172d {+08h 52m 41s} (1950)
GRB_DEC: +11.173d {+11d 10' 23"} (J2000),
+11.153d {+11d 09' 10"} (current),
+11.365d {+11d 21' 53"} (1950)
GRB_DATE: 13476 TJD; 106 DOY; 05/04/16
GRB_TIME: 81354.11 SOD {22:35:54.11} UT
TRIGGER_INDEX: 127
GRB_PHI: -153.15 [deg]
GRB_THETA: 53.18 [deg]
DELTA_TIME: 0.00 [sec]
LC_URL: sw00114797000msb.lc
SUN_POSTN: 25.08d {+01h 40m 20s} +10.41d {+10d 24' 51"}
SUN_DIST: 106.06 [deg]
MOON_POSTN: 124.08d {+08h 16m 20s} +25.14d {+25d 08' 22"}
MOON_DIST: 16.81 [deg]
MOON_ILLUM: 53 [%]
GAL_COORDS: 216.87, 32.54 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 133.11, -5.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-BAT GRB Lightcurve.
COMMENTS: This does not match any source in the ground catalog.
- GCN notice #3279
D. Hullinger (UMD), L. Barbier, S. Barthelmy (GSFC), J. Cummings (GSFC/NRC),
E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA),
C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC),
T. Sakamoto (GSFC/NRC), G. Sato (ISAS), M. Suzuki (Saitama),
J. Tueller (GSFC)
on behalf of the Swift-BAT team:
At 22:35:54.11 UT Swift-BAT triggered on burst GRB 050416b (trigger=114797).
The BAT flight position is RA,Dec=133.853,+11.173 (J2000). We note this
is 17 deg from the Moon, hence the s/c did not slew because of the Moon
observing constraint. The burst was 53 deg off the BAT bore sight.
The lightcurve shows a narrow peak with a total burst duration of ~5 sec
(T90=~3sec in 15-350 keV).
- GCN notice #3281
S. Piranomonte, A. Melandri, L.A. Antonelli, S. Covino, F.M. Zerbi,
G. Chincarini, M. Rodono', G. Tosti, P. Conconi, G. Cutispoto, E.
Molinari, L. Nicastro, E. Palazzi, E. Meurs, P. Goldoni, on behalf of
the REM/ROSS Team report:
"The REM telescope at the La Silla Observatory (ESO) is observing the
field of GRB 050416B (BAT Trigger #114797).
Observations started just after the sunset in La Silla on Apr. 17
00:01:17 UT about 1.1hr after the burst.
Preliminary analysis of the first frames reveal no new sources in the
BAT error circle (Hullinger et al., GCN 3279) approximately down to the 2MASS
limit in the J, H and Ks bands.
Observations and further analyses are going on.
This message may be cited."
- GCN notice #3282
E. Berger, J. Mulchaey (Carnegie Observatories), N. Morrell, and W.
Krzeminski (LCO) report:
"We imaged the BAT error circle of GRB 050416b (GCN 3279) with the Swope
40-inch telescope (r-band) and the du Pont 100-inch telescope (I-band) at
LCO starting on 2005, April 17.001 and 17.002 UT, respectively (86 and 114
min after the burst). We also obtained a 5-minute image with IMACS on the
Magellan/Baade telescope in R-band. A comparison to DSS reveals no new
sources to the depth of the survey in any of our images."
- GCN notice #3283
E. Berger, J. Mulchaey (Carnegie Observatories), N. Morrell, and W.
Krzeminski (LCO) report:
"We imaged the BAT error circle of GRB 050416b (GCN 3279) with the Swope
40-inch telescope (r-band) and the du Pont 100-inch telescope (I-band) at
LCO starting on 2005, April 17.001 and 17.002 UT, respectively (86 and 114
min after the burst). We also obtained a 5-minute image with IMACS on the
Magellan/Baade telescope in R-band. A comparison to DSS reveals no new
sources to the depth of the survey in any of our images."
- GCN notice #3284
G. Sato (ISAS), L. Barbier, S. Barthelmy (GSFC), J. Cummings (GSFC/NRC),
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (UMD),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL),
A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), M. Suzuki (Saitama),
J. Tueller (GSFC)
on behalf of the Swift-BAT team:
At 22:35:54.1 UT Swift-BAT detected GRB 050416b (trigger=114797)
(GCN Circ 3279, Hullinger et al.). The refined BAT ground position
is (RA,Dec) = 133.854, 11.182, [deg; J2000] +- 3 arcmin, (95%
containment). The partial coding fraction was 16%.
The moon is moving towards the position of the GRB, and Swift will not
be able to observe for several days because of the spacecraft moon
angle constraint.
The BAT mask weighted light curve shows a FRED-like structure.
T90 (15-350 keV) is (5.4 +- 0.9) seconds (estimated error including
systematics).
The time-averaged spectrum is well fitted in a simple power-law
model. The photon index is 1.5 +- 0.2. The fluence in the 15-350
keV band is (2.1 +- 0.3) x 10^-6 erg/cm2. The peak photon flux in
the 15-350 band is (7.9 +- 0.7) ph/cm2/s. The quoted errors are at
the 90% confidence level.
- GCN notice #3285
M. Jelinek, A. de Ugarte Postigo (IAA-CSIC Granada),
P. Kubanek (ASU-CAS Ondrejov), T. J. Mateo Sanguino
(Univ. de Huelva), S. Castillo, J. Gorosabel, S.Guziy
and A. J. Castro-Tirado (IAA-CSIC),
report:
"Following the detection by SWIFT/BAT of GRB 050416B
(Hullinger et al., GCN 3279), the 0.6m BOOTES-IR
telescope at IAA's Observatorio de Sierra Nevada
responded automatically at 23:13 UT (i.e. 38 minutes
after the event). Although we are still testing the
telescope during the commissioning phase, and the
near-IR camera is not yet installed, an optical camera
was available. A co-addition of first 20 R-band images
taken at that particular instrument reveals no optical
counterpart in the SWIFT/BAT error box down to R = 19.
The instrument sensitivity was highly compromised due
to the presence of the nearby moon. Additional info on
BOOTES-IR can be found at
www.iaa.csic.es/BOOTES-IR.html."
This message can be quoted.
- GCN notice #3295
J. A. Kennea, C. P. Hurkett, D. N. Burrows (PSU), V. Mangano
(IASF/Palermo), T. Sakamoto (GSFC/NRC), N. Gehrels (NASA/GSFC) report on
behalf of the Swift XRT team:
The Swift BAT instrument detected a GRB at 22:35:54 UT on 16th April 2005
(GCN Circ 3279). Due to the close proximity of this burst to the moon, the
observatory did not executed an automated slew at that time. This burst
became visible to Swift Narrow Field Instruments at 12:48:00 UT on 20th
April 2005, and was observed by Swift-XRT as a pre-planned target. From
ground processed data we find a uncatalogued X-ray source within the BAT
error circle, located at:
RA(J2000) = 08:55:35.2,
Dec(J2000) = +11:10:32.
We estimate an uncertainty of about 5 arcseconds radius (90% containment).
This position is 152 arcseconds from the BAT position reported in GCN
3284. This source should be considered a tentative afterglow candidate, we
are currently performing further observations to determine if the source
is fading.
- GCN notice #3361
The Swift BAT instrument detected a GRB at 22:35:54 UT on 16th April 2005
(Hullinger et al., GCN 3279). Due to the close proximity of this burst to
the moon, the observatory did not execute an automated slew at that time.
This burst became visible to Swift Narrow Field Instruments at 12:48:00 UT
on 20th April 2005 (i.e. 86.3 hours after the trigger), and was observed by
Swift-XRT as a pre-planned target on 20th April, 22nd April, and 1st May
2005. Five uncataloged sources are detected within the BAT error
circle (Sato et al., GCN Circ 3284), but none of them is fading. The source
previously indicated as a tentative afterglow candidate in GCN 3295 (Kennea
et al.) is stable within errors. Thus we cannot identify any afterglow for
this GRB. We estimate 3 sigma upper limits of 2E-14, 1.7E-14, and 1.5E-14
erg/cm2/s for the flux of the GRB afterglow in the first, second and third
observations, respectively.
- GCN notice #3362
V. La Parola, V. Mangano (INAF-IASF/Palermo), J. A. Kennea, D. N. Burrows
(PSU), T. Sakamoto (GSFC), C. P. Hurkett (U. Leicester) and N. Gehrels
(GSFC) report on behalf of the Swift XRT team:
The Swift BAT instrument detected a GRB at 22:35:54 UT on 16th April 2005
(Hullinger et al., GCN 3279). Due to the close proximity of this burst to
the moon, the observatory did not execute an automated slew at that time.
This burst became visible to Swift Narrow Field Instruments at 12:48:00 UT
on 20th April 2005 (i.e. 86.3 hours after the trigger), and was observed by
Swift-XRT as a pre-planned target on 20th April, 22nd April, and 1st May
2005. Five uncataloged sources are detected within the BAT error
circle(Sato et al., GCN Circ 3284), but none of them is fading. The source
previously indicated as a tentative afterglow candidate in GCN 3295 (Kennea
et al.) is stable within errors. Thus we cannot identify any afterglow for
this GRB. We estimate 3 sigma upper limits of 2E-14, 1.7E-14, and 1.5E-14
erg/cm2/s for the flux of the GRB afterglow in the first, second and third
observations, respectively.
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