GRB 200107B
GCN Circular 26659
Subject
GRB 200107B: Fermi GBM Final Real-time Localization
Date
2020-01-07T19:36:52Z (5 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
The Fermi GBM team reports the detection of a likely LONG GRB
At 19:26:22 UT on 7 Jan 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200107B (trigger 600117987.8063 / 200107810).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 356.9, Dec = -80.1 (J2000 degrees, equivalent to J2000 23h 47m, -80d 05'), with a statistical uncertainty of 8.3 degrees.
The angle from the Fermi LAT boresight is 61.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200107810/quicklook/glg_skymap_all_bn200107810.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/bn200107810/quicklook/glg_healpix_all_bn200107810.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200107810/quicklook/glg_lc_medres34_bn200107810.gif
GCN Circular 26661
Subject
GRB 200107B: Swift detection of a burst
Date
2020-01-07T20:32:11Z (5 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
M. G. Bernardini (INAF-OAB), P. D'Avanzo (INAF-OAB),
J. A. Kennea (PSU), N. J. Klingler (PSU), N. P. M. Kuin (UCL-MSSL),
S. J. LaPorte (PSU), A. Y. Lien (GSFC/UMBC),
F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), M. J. Moss (GWU),
K. L. Page (U Leicester), D. M. Palmer (LANL), B. Sbarufatti (PSU),
M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of
the Neil Gehrels Swift Observatory Team:
At 19:26:28 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 200107B (trigger=948219). Swift did not slew immediately
due to an observing constraint.
The BAT on-board calculated location is
RA, Dec 107.066, -83.716 which is
RA(J2000) = 07h 08m 16s
Dec(J2000) = -83d 42' 56"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a multi-peaked
structure with a duration of about 80 sec. The peak count rate
was ~1700 counts/sec (15-350 keV), at ~35 sec after the trigger.
The XRT began observing the field at 19:41:27.6 UT, 899.0 seconds after
the BAT trigger. Using promptly downlinked data we find an uncatalogued
X-ray source located at RA, Dec 106.92567, -83.7189 which is
equivalent to:
RA(J2000) = 07h 07m 42.16s
Dec(J2000) = -83d 43' 08.0"
with an uncertainty of 21.3 arcseconds (radius, 90% containment). This
location is 56 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 https://www.swift.ac.uk/sper. We
cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event
data gives a column density consistent with the Galactic value of 1.49
x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 902 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. The 2.7'x2.7' sub-image processing
FAILED because of no aspect solution. Results from the list of sources
generated on-board are not available at this time. No correction has been made
for the expected extinction corresponding to E(B-V) of 0.19.
The "B" burst name is based on the Fermi/GBM detection
circular of this burst (GCN Circ. 26659).
Burst Advocate for this burst is M. G. Bernardini (grazia.bernardini AT brera.inaf.it).
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 Circular 26670
Subject
GRB 200107B: Swift-BAT refined analysis
Date
2020-01-08T16:50:49Z (5 years ago)
From
Sibasish Laha at GSFC <sibasish.laha@nasa.gov>
S. D. Barthelmy(GSFC), M.G. Bernardini(INAF-OAB), J. R. Cummings(CPI),
H. A. Krimm (NSF), S. Laha (GSFC/UMBC),
A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (AGU),
M. Stamatikos (OSU), T. N. Ukwatta (LANL)
(i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 200107B (trigger #948219)
(M. G. Bernardini et al., GCN Circ. 26661). The BAT ground-calculated position is
RA, Dec = 107.067, -83.716 deg which is
RA(J2000) = 07h 08m 16.0s
Dec(J2000) = -83d 42' 56.5"
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 78%.
The mask weighted light curve shows complex multi-peak structures with a duration of ~100 s.
The overall structure starts at ~T-40 s and lasts till ~T+80s.
T90 (15-350 keV) is 86.68 +- 11.64 sec (estimated error including systematics).
The time-averaged spectrum from T-29.86 to T+77.04 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.41 +- 0.10. The fluence in the 15-150 keV band is 3.0 +- 0.2 x 10^-06 erg/cm2.
The 1-sec peak photon flux measured from T+36.09 sec in the 15-150 keV band
is 1.9 +- 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/948219/BA/
GCN Circular 26671
Subject
GRB 200107B: Fermi GBM observation
Date
2020-01-08T17:47:34Z (5 years ago)
From
Stephen Lesage at Fermi-GBM Team <sjl0014@uah.edu>
GRB 200107B: Fermi GBM observation
S. Lesage (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 19:26:22.81 UT on 07 January 2020, the Fermi Gamma-Ray Burst Monitor
(GBM)
triggered and located GRB 200107B (trigger 600117987 / 200107810),
which was also detected by the Swift/BAT (Bernardini et al. 2020, GCN
26661).
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 47
degrees.
The GBM light curve shows a complex, multi-peaked structure
with a duration (T90) of about 81 s (50-300 keV).
The time-averaged spectrum from T0+4 s to T0+44 s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is -1.1 +/- 0.1 and
the cutoff energy, parameterized as Epeak, is 412 +/- 138 keV.
The event fluence (10-1000 keV) in this time interval is
(1.29 +/- 0.15)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+41.0 s in the 10-1000 keV band is 3.3 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support
Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular 26672
Subject
Swift GRB 200107B: Global MASTER-Net observations report
Date
2020-01-08T19:28:40Z (5 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin,
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D.Kuvshinov, D. Cheryasov
(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),
H.Levato
(Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
D. Buckley
(South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova
(Irkutsk State University, API),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko
(Blagoveschensk Educational State University)
MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB 200107B ( M. G. Bernardini et al., GCN 26661) errorbox 891 sec after notice time and 29 sec after trigger time at 2020-01-07 19:42:11 UT, with upper limit up to 18.7 mag. The observations began at zenith distance = 54 deg. The sun altitude is -20.2 deg.
The galactic latitude b = -27 deg., longitude l = 296 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1253675
We obtain a following upper limits.
Tmid-T0 | Site |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________
119 | MASTER-SAAO | P\ | 180 | 17.1 |
415 | MASTER-SAAO | P\ | 180 | 17.4 |
616 | MASTER-SAAO | P\ | 180 | 17.4 |
818 | MASTER-SAAO | P\ | 180 | 16.6 |
1231 | MASTER-SAAO | C | 180 | 18.3 |
1348 | MASTER-SAAO | P\ | 180 | 17.4 |
1550 | MASTER-SAAO | P\ | 180 | 17.4 |
1751 | MASTER-SAAO | P\ | 180 | 17.5 |
1953 | MASTER-SAAO | P\ | 180 | 17.3 |
2161 | MASTER-SAAO | C | 180 | 18.6 |
2371 | MASTER-SAAO | C | 180 | 18.5 |
2582 | MASTER-SAAO | C | 180 | 18.5 |
2792 | MASTER-SAAO | C | 180 | 18.5 |
3001 | MASTER-SAAO | C | 180 | 18.6 |
3211 | MASTER-SAAO | C | 180 | 18.6 |
3421 | MASTER-SAAO | C | 180 | 18.7 |
3632 | MASTER-SAAO | C | 180 | 18.5 |
3843 | MASTER-SAAO | C | 180 | 18.7 |
4052 | MASTER-SAAO | C | 180 | 18.6 |
4261 | MASTER-SAAO | C | 180 | 18.6 |
4480 | MASTER-SAAO | C | 180 | 18.7 |
5034 | MASTER-SAAO | C | 180 | 17.6 |
5247 | MASTER-SAAO | C | 180 | 18.6 |
5459 | MASTER-SAAO | C | 180 | 18.6 |
5671 | MASTER-SAAO | C | 180 | 18.6 |
5884 | MASTER-SAAO | C | 180 | 18.6 |
6098 | MASTER-SAAO | C | 180 | 18.5 |
6310 | MASTER-SAAO | C | 180 | 18.6 |
6523 | MASTER-SAAO | C | 180 | 18.5 |
6735 | MASTER-SAAO | C | 180 | 18.5 |
6948 | MASTER-SAAO | C | 180 | 18.4 |
7160 | MASTER-SAAO | C | 180 | 18.4 |
7373 | MASTER-SAAO | C | 180 | 18.5 |
7585 | MASTER-SAAO | C | 180 | 18.5 |
7799 | MASTER-SAAO | C | 180 | 18.6 |
8010 | MASTER-SAAO | C | 180 | 18.5 |
8224 | MASTER-SAAO | C | 180 | 18.5 |
8471 | MASTER-SAAO | C | 180 | 18.6 |
8684 | MASTER-SAAO | C | 180 | 18.5 |
8896 | MASTER-SAAO | C | 180 | 18.5 |
9109 | MASTER-SAAO | C | 180 | 18.5 |
9321 | MASTER-SAAO | C | 180 | 18.4 |
9538 | MASTER-SAAO | C | 180 | 18.4 |
9752 | MASTER-SAAO | C | 180 | 18.5 |
9963 | MASTER-SAAO | C | 180 | 18.3 |
10176 | MASTER-SAAO | C | 180 | 18.3 |
10389 | MASTER-SAAO | C | 180 | 18.3 |
10601 | MASTER-SAAO | C | 180 | 18.3 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 26685
Subject
GRB 200107B: Swift-XRT refined Analysis
Date
2020-01-09T14:15:43Z (5 years ago)
From
Paolo D'Avanzo at INAF - OAB <paolo.davanzo@inaf.it>
M. Perri (ASDC), V. D'Elia (ASDC), B. Sbarufatti (PSU), D.N. Burrows
(PSU), J. D. Gropp (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U.
Leicester), A. D'Ai (INAF-IASFPA) and M. G. Bernardini (INAF-OAB)
report on behalf of the Swift-XRT team:
We have analysed 3.4 ks of XRT data for GRB 200107B (Bernardini et al.
GCN Circ. 26661), from 908 s to 139.6 ks after the BAT trigger. The
data are entirely in Photon Counting (PC) mode. The refined XRT
position is RA, Dec = 106.9086, -83.7162 which is equivalent to:
RA (J2000): 07 07 38.07
Dec(J2000): -83 42 58.3
with an uncertainty of 4.0 arcsec (radius, 90% confidence).
The light curve can be modelled with a power-law decay with a decay
index of alpha=1.0 (+0.3, -0.4).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.9 (+0.5, -0.4). The
best-fitting absorption column is 2.8 (+2.4, -1.3) x 10^21 cm^-2,
consistent with the Galactic value of 1.5 x 10^21 cm^-2 (Willingale et
al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux
conversion factor deduced from this spectrum is 3.9 x 10^-11 (5.4 x
10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 2.8 (+2.4, -1.3) x 10^21 cm^-2
Galactic foreground: 1.5 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index: 1.9 (+0.5, -0.4)
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00948219.
This circular is an official product of the Swift-XRT team.
GCN Circular 26693
Subject
GRB 200107B: Swift/UVOT Observations
Date
2020-01-09T22:28:12Z (5 years ago)
From
Frank Marshall at Swift/UVOT <marshall@milkyway.gsfc.nasa.gov>
F.E. Marshall (NASA/GSFC) and M. G. Bernardini (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200107B
903 s after the BAT trigger (Bernardini et al., GCN Circ. 26661).
Some of the exposures are affected by poor attitude control,
but we have selected observing times for which this is not
a significant issue. A source consistent with the position of the optical
source reported by Lipunov (GCN Circ. 26660) is weakly detected (2.6 sigma)
in the initial UVOT exposure.
The preliminary detection and 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 903 1052 55 19.3 (+0.5/-0.4)
v 1059 1079 19 >18.6
b 1157 1177 19 >18.6
u 1133 3144 179 >19.7
w1 2777 2976 197 >19.5
w2 1208 1228 19 >18.2
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.19 in the direction of the burst
(Schlegel et al. 1998).