| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
14:42:24 UTC |
GCN_circulars,Swift Det |
| ra |
341.1930° |
Swift |
| decl |
-29.7400° |
Swift |
| pos_error |
2.33e-02° |
Swift |
| GBM_located |
False |
|
| mjd |
58711.61277777778 |
GCN_circulars,Swift Det |
| IPN table |
|---|
| GRB_name |
GRB190816A |
| ra |
341.1917° |
| decl |
-29.7333° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB190816A |
| t_trigger |
14:42:24 UTC |
| ra |
341.1930° |
| decl |
-29.7400° |
| pos_error |
2.33e-02° |
| GCN 25368 table |
|---|
| GRB_name |
GRB190816A |
| GCN_number |
25368 |
| Detection_method |
Swift Det |
| t_trigger |
14:42:24 UTC |
| ra |
341.1930° |
| decl |
-29.7400° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 25368
SUBJECT: GRB 190816A: Swift detection of a burst
DATE: 19/08/16 14:56:49 GMT
FROM: Scott Barthelmy at NASA/GSFC
K. L. Page (U Leicester), S. D. Barthelmy (GSFC),
P. A. Evans (U Leicester), J.D. Gropp (PSU), N. J. Klingler (PSU),
A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), M. J. Moss (GWU),
D. M. Palmer (LANL) and A. Tohuvavohu (PSU) report on behalf of the
Neil Gehrels Swift Observatory Team:
At 14:42:24 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 190816A (trigger=920783). Swift did not slew due to an observing
constraint. The BAT on-board calculated location is
RA, Dec 341.193, -29.740, which is
RA(J2000) = 22h 44m 46s
Dec(J2000) = -29d 44' 23"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows a couple peaks
with a total duration of about 30 sec. The peak count rate
was ~600 counts/sec (15-350 keV), at ~3 sec after the trigger.
Due to a Moon observing constraint, Swift cannot slew to the BAT
position until 17:11 UT on 2019 August 17. There will thus be no XRT or
UVOT data for this trigger before this time.
Burst Advocate for this burst is K. L. Page (klp5 AT leicester.ac.uk).
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/)
|
| GCN 25399 table |
|---|
| GRB_name |
GRB190816A |
| GCN_number |
25399 |
| Detection_method |
Swift-XRT Other |
| ra |
341.1897° |
| decl |
-29.7577° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 25399
SUBJECT: GRB 190816A: Swift-XRT observations
DATE: 19/08/19 08:14:53 GMT
FROM: Kim Page at U.of Leicester
A. D'Ai (INAF-IASFPA), D.N. Burrows (PSU), J. D. Gropp (PSU), A.
Tohuvavohu (PSU), J.P. Osborne (U. Leicester), K.L. Page (U.
Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB) and K. L.
Page (U Leicester) report on behalf of the Swift-XRT team:
We have analysed 3.8 ks of Photon Counting (PC) mode XRT data for the
Swift/BAT-detected burst GRB 190816A (Page et al. GCN Circ. 25368),
collected between T0+141.7 ks and T0+216.6 ks.
One uncatalogued X-ray source has been detected consistent with being
within 296 arcsec of the Swift/BAT position, it is below the RASS limit
and shows no definitive signs of fading. Therefore, at the present time
we cannot confirm this as the afterglow. Details of this source are
given below:
Source 4:
RA (J2000): 341.1897 = 22:44:45.53
Dec (J2000): -29.7577 = -29:45:27.8
Error: 4.8 arcsec (radius, 90% conf. [Enhanced position])
Count-rate: (8.1 [+1.8, -1.7])e-3 ct s^-1
Distance: 64 arcsec from Swift/BAT position.
Flux: (2.67 [+0.60, -0.56])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)
Three uncatalogued sources were also detected too far from the GRB
position to be likely afterglow candidates.
The results of the XRT-team automatic analysis of the XRT observations,
including a position-specific upper limit calculator, are available at
https://www.swift.ac.uk/ToO_GRBs/00920783.
This circular is an official product of the Swift-XRT team.
|
| GCN 25405 table |
|---|
| GRB_name |
GRB190816A |
| GCN_number |
25405 |
| Detection_method |
Swift-BAT Det |
| ra |
341.1830° |
| decl |
-29.7450° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 25405
SUBJECT: GRB 190816A: Swift-BAT refined analysis
DATE: 19/08/20 00:10:43 GMT
FROM: Amy Lien at GSFC
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC),
J. R. Cummings (CPI), H. A. Krimm (NSF),
A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), K. L. Page (U Leicester),
T. Sakamoto (AGU), M. Stamatikos (OSU)
(i.e. the Swift-BAT team):
Using the data set from T-862 to T+963 sec from the recent telemetry
downlink,
we report further analysis of BAT GRB 190816A (trigger #920783)
(Page et al., GCN Circ. 25368). The BAT ground-calculated position is
RA, Dec = 341.183, -29.745 deg which is
RA(J2000) = 22h 44m 44.0s
Dec(J2000) = -29d 44' 42.5"
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 30%.
The mask-weighted light curve shows a weak multi-pulse structure that
starts at ~ T-200 s and ends at ~T+340 s. T90 (15-350 keV) is
375.0 +- 92.9 sec (estimated error including systematics).
The time-averaged spectrum from T-206.5 to T+341.6 sec is best fit by a
simple
power-law model. The power law index of the time-averaged spectrum is
1.62 +- 0.11. The fluence in the 15-150 keV band is 9.8 +- 0.6 x 10^-6
erg/cm2.
The 1-sec peak photon flux measured from T+151.57 sec in the 15-150 keV band
is 1.3 +- 0.3 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/920783/BA/
|
| GCN 25473 table |
|---|
| GRB_name |
GRB190816A |
| GCN_number |
25473 |
| Detection_method |
Swift-XRT Other |
| ra |
341.1895° |
| decl |
-29.7576° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 25473
SUBJECT: GRB 190816A: Swift-XRT afterglow detection
DATE: 19/08/25 04:57:43 GMT
FROM: Kim Page at U.of Leicester
A. D'Ai (INAF-IASFPA), D.N. Burrows (PSU), J. D. Gropp (PSU), A.
Tohuvavohu (PSU), J.P. Osborne (U. Leicester), K.L. Page (U.
Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB) and P.A.
Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has conducted further observations of the field of the
Swift/BAT-detected burst GRB 190816A (Ukwatta et al. GCN Circ. 25405).
The observations now extend from T0+141.7 ks to T0+723.4 ks. The source
previously reported by D'Ai et al. (GCN Circ. 25399), "Source 4", is
fading with 3-sigma significance, and is therefore likely the GRB
afterglow. Using 267 s of PC mode data and 1 UVOT image, we find an
enhanced XRT position (using the XRT-UVOT alignment and matching UVOT
field sources to the USNO-B1 catalogue): RA, Dec = 341.18949, -29.75761
which is equivalent to:
RA (J2000): 22h 44m 45.48s
Dec(J2000): -29d 45' 27.4"
with an uncertainty of 4.9 arcsec (radius, 90% confidence). This
position is 64 arcsec from the Swift/BAT position. The source is
fading with alpha >0.5.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00920783.
The results of the full analysis of the XRT observations are available
at https://www.swift.ac.uk/ToO_GRBs/00920783.
This circular is an official product of the Swift-XRT team.
|