| Summary table |
|---|
| Variable |
Value |
Source |
| GRB_name_Fermi |
GRB200128153 |
|
| T0 |
3:40:05 UTC |
GCN_circulars,Fermi GBM final loc |
| ra |
158.6500° |
Fermi_GBM |
| decl |
41.5700° |
Fermi_GBM |
| pos_error |
1.02e+01° |
Fermi_GBM |
| T90 |
0.576 s |
Fermi_GBM |
| T90_error |
0.181 s |
Fermi_GBM |
| T90_start |
3:40:05.583 UTC |
Fermi_GBM |
| fluence |
4.28e-07 erg/cm² |
Fermi_GBM |
| fluence_error |
9.57e-09 erg/cm² |
Fermi_GBM |
| T100 |
1.159 s |
|
| GBM_located |
True |
|
| mjd |
58876.15283564815 |
GCN_circulars,Fermi GBM final loc |
| Fermi GBM table |
|---|
| GRB_name_Fermi |
GRB200128153 |
| trigger_name |
bn200128153 |
| ra |
158.6500° |
| decl |
41.5700° |
| pos_error |
1.02e+01° |
| datum |
2020-01-28 |
| t_trigger |
3:40:05.775 UTC |
| T90 |
0.576 s |
| T90_error |
0.181 s |
| T90_start |
3:40:05.583 UTC |
| fluence |
4.28e-07 erg/cm² |
| fluence_error |
9.57e-09 erg/cm² |
| flux_1024 |
2.99e+00 erg/cm²/s |
| flux_1024_error |
3.52e-01 erg/cm²/s |
| flux_1024_time |
-3.20e-01 erg/cm²/s |
| flux_64 |
1.41e+01 erg/cm²/s |
| flux_64_error |
2.38e+00 erg/cm²/s |
| GCN 26909 table |
|---|
| GRB_name |
GRB200128A |
| GCN_number |
26909 |
| Detection_method |
Fermi GBM final loc |
| t_trigger |
3:40:05 UTC |
| ra |
158.6000° |
| decl |
41.6000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 26909
SUBJECT: GRB 200128A: Fermi GBM Final Real-time Localization
DATE: 20/01/28 03:50:27 GMT
FROM: Fermi GBM Team at MSFC/Fermi-GBM
The Fermi GBM team reports the detection of a likely SHORT GRB
At 03:40:05 UT on 28 Jan 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200128A (trigger 601875610.774992 / 200128153).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 158.6, Dec = 41.6 (J2000 degrees, equivalent to J2000 10h 34m, 41d 36'), with a statistical uncertainty of 19.0 degrees.
The angle from the Fermi LAT boresight is 129.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200128153/quicklook/glg_skymap_all_bn200128153.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200128153/quicklook/glg_healpix_all_bn200128153.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200128153/quicklook/glg_lc_medres34_bn200128153.gif
|
| GCN 26966 table |
|---|
| GRB_name |
GRB200128A |
| GCN_number |
26966 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 26966
SUBJECT: ZTF Discovery of ZTF20aajnksq: a Rapidly Fading Luminous Transient in the GRB 200128A Localiziation Region
DATE: 20/02/02 21:53:10 GMT
FROM: Anna Ho at Caltech
The Zwicky Transient Facility (ZTF; ATel #11266) reports the discovery of
ZTF20aajnksq, a rapidly fading red transient located at
12:47:04.87 +45:12:02.3 (J2000)
191.770292 +45.200626 (J2000)
and detected as part of the ZTF Uniform Depth Survey (Goldstein et al. in
prep).
The source was discovered on UT 2020-01-28T06:43:20.640 at r=19.6 mag,
which was 0.74 days after the last non-detection. Follow-up photometry with
the IO:O optical imager on the Liverpool Telescope (PI: D. Perley) and the
Wafer-Scale Imager for Prime (WASP) on the 200-inch Hale telescope (PI: I.
Andreoni) at Palomar Observatory established a rapid fade rate of 2.5
magnitudes in 1.25 days as well as red colors (g-r=+0.65, from the WASP
observation).
We obtained a target-of-opportunity (PI: M. M. Kasliwal) spectrum with the
Low Resolution Imaging Spectrometer (LRIS) on the Keck I 10-m telescope,
which showed features consistent with the Lyman break and Lyman alpha
absorption at z=2.9.
We obtained a target-of-opportunity observation with the Neil Gehrels Swift
Observatory (Swift) and detected X-ray emission at 0.0039 ct/s. Assuming a
neutral hydrogen column density n_H = 1.77E20/cm2 and a power-law spectrum
with photon index 2, the unabsorbed flux is 1.5E-13 erg/cm^2/s,
corresponding to a luminosity of 1.1E46 erg/s.
We searched the Fermi/GBM catalog and identified a reported likely short
GRB 24 degrees away: GRB 200128A (GCN #26909). ZTF20aajnksq is located
along the 90% contour of the localization region. The trigger time of GRB
200128A is three hours before the first optical detection.
We are grateful to the staff of Palomar and Keck for rapidly scheduling our
observations, and to M. Heida (ESO Garching) and J. Rhoads (Goddard) for
accommodating the interruption to their scheduled programs. Thank you to
the Swift team for rapidly scheduling and executing our observations.
ZTF is a project led by PI S. R. Kulkarni at Caltech (see ATEL #11266), and
includes IPAC; WIS, Israel; OKC, Sweden; JSI/UMd, USA; UW,USA; DESY,
Germany; NRC, Taiwan; UW Milwaukee, USA and LANL USA. ZTF acknowledges the
generous support of the NSF under AST MSIP Grant No 1440341. Alert
distribution service provided by DIRAC@UW. Alert filtering is being
undertaken by the GROWTH marshal system, supported by NSF PIRE grant
1545949.
|
| GCN 26968 table |
|---|
| GRB_name |
GRB200128A |
| GCN_number |
26968 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 26968
SUBJECT: ZTF20aajnksq: Gemini-North r-band photometry
DATE: 20/02/03 02:54:07 GMT
FROM: Leo Singer at GSFC
ZTF20aajnksq: Gemini-North optical photometry
Leo P. Singer (NASA/GSFC), Tomas Ahumada (UMD), Anna Y. Q. Ho (Caltech)
report on behalf of the Zwicky Transient Facility (ZTF) and Global Relay
of Observatories Watching Transients Happen (GROWTH) collaborations:
Starting at 2020-02-01T12:25:57 UTC, we imaged ZTF20aajnksq/AT2020blt
(Ho et al., ATel #13429, GCN 26966) using the Gemini Multi-Object
Spectrograph (GMOS) mounted on the Gemini North 8-meter telescope on
Mauna Kea.
We combined 8 r-band 200s exposures using DRAGONS, a Python-based data
reduction platform provided by the Gemini Observatory. We detect a source
at the location of the transient. The aperture photometry calibrated
against Pan-STARRS DR1 magnitudes (Chambers et al., 2016) of the object is
r = 25.2 +- 0.05 AB mag.
We note that for the redshift (z = 2.9) and apparent magnitude
(r = 19.6 AB mag) reported in GCN 26966, the absolute magnitude of the
source (M_r = -27.4) would be significantly brighter than afterglows of
short GRBs at one day: short GRBs are typically M_B = -17.34 +- 0.50 AB
mag whereas long GRBs are typically M_B = -23.17 +- 0.21 AB mag (Kann et
al., 2011). We therefore suggest three alternative interpretations:
(a) GRB 200128A is not a typical short GRB, (b) ZTF20aajnksq is the
afterglow of a different (long) GRB, or (c) ZTF20aajnksq is an orphan
afterglow.
We thank S. Stewart and the Gemini North staff for executing these
observations.
|
| GCN 26970 table |
|---|
| GRB_name |
GRB200128A |
| GCN_number |
26970 |
| Detection_method |
Fermi GBM Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 26970
SUBJECT: ZTF20aajnksq: Occulted by Earth at the time of GRB 200128A
DATE: 20/02/03 04:40:02 GMT
FROM: Rachel Hamburg at UAH
R. Hamburg (UAH) reports on behalf of the Fermi-GBM Team:
The newly discovered transient ZTF20aajnksq (GCN 26966)
was found within the 3-sigma localization contour of
GRB 200128A (GCN 26909) approximately 3 hours after the
GBM trigger time. However the reported position
of ZTF20aajnksq:
12:47:04.87 +45:12:02.3 (J2000)
191.770292 +45.200626 (J2000)
was occulted by the Earth for Fermi-GBM from approximately
25.3 minutes prior until 1.8 minutes after the GRB trigger
time. The position was also occulted 18.0 minutes prior
until 8.8 minutes after the ZTF20aajnksq detection time.
Therefore, we consider it unlikely that GRB 200128A is
associated with ZTF20aajnksq.
|