LIGO/VIRGO G184098
GCN Circular 18359
Subject
LIGO/VIRGO G184098 : classifications of transients from the LSQ observations
Date
2015-09-23T12:03:39Z (10 years ago)
From
S. J. Smartt at Queens U Belfast <s.smartt@qub.ac.uk>
K. Takats, C. Agliozzo (UNAB, MAS), A. Razza (DAS, MAS), F. Olivares (UNAB, MAS), I. Pessa (PUC, MAS), H. Campbell (IOA), N. Elias-Rosa, E. Cappellaro (INAF - OAPd), C. Inserra (QUB), K. Maguire (ESO), S. J. Smartt (QUB), K. W. Smith (QUB), M. Sullivan (Southampton), S. Valenti (LCOGT), O. Yaron (Weizmann), D. Young (QUB), Ilan Manulis (Weizmann), C. Baltay, N. Ellman, E. Hadjiyska, R. McKinnon, D. Rabinowitz, S. Rostami (Yale University), U. Feindt, M. Kowalski (Universitat Bonn), P. Nugent (LBL Berkeley)
on behalf of PESSTO.
Following the LSQ discovery (Rabinowitz et al, GCN 18347) of candidates in the G184098 southern
error box, PESSTO, the Public ESO Spectroscopic Survey for Transient Objects (see Smartt et al. 2015, A&A, 579, 40 http://www.pessto.org), reports the following classifications. All observations were performed on the ESO New Technology Telescope at La Silla on the night of 2015-09-22, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024). Classification spectra can be obtained from http://www.pessto.org (via WISeREP).
Name | RA (J2000) | Dec (J2000) | Disc. Date | Source | Disc Mag | z | Type | Phase |
LSQ15bbb | 07:25:16.50 | -69:04:01.1 | 20150918 | LSQ | 17.36 | 0.037 | Ia | around max |
LSQ15bbj | 07:16:14.45 | -69:36:00.2 | 20150918 | LSQ | 19.75 | 0.086 | Ia | +4-5d |
The two transients are normal looking type Ia supernovae and almost certainly unrelated to the
GW trigger.
GCN Circular 18395
Subject
LIGO/VIRGO G184098 : PESSTO classification of PS15cbm in the northern region
Date
2015-10-05T15:09:22Z (10 years ago)
From
S. J. Smartt at Queens U Belfast <s.smartt@qub.ac.uk>
H. Campbell (Cambridge), J. Lyman (Warwick), M. Fraser (Cambridge), J. Anderson (ESO), C. Inserra (QUB), I. Manulis (Weizmann), K. Maguire (QUB), S. J. Smartt (QUB), K. W.
+Smith (QUB), M. Sullivan (Southampton), S. Valenti (LCOGT), O. Yaron (Weizmann), D. Young, D. Wright (QUB), K. Chambers, M. Huber, E. Magnier, H. Flewelling, C. Waters, J.
+Tonry, A. Schultz, N. Primak (IfA, University of Hawaii), C. Stubbs (Harvard)
Following the Pan-STARSS discovery (Smartt et al, GCN 18394) of candidates
in the G184098 northern error box, PESSTO, the Public ESO Spectroscopic
Survey for Transient Objects (see Smartt et al. 2015, A&A, 579,
40 http://www.pessto.org), reports that PS15cbm is a type Ia supernova a
t z=0.06 at +2-3w past maximum light.
All observations were performed on the ESO New Technology Telescope at
La Silla on the night of 2015-10-03, using EFOSC2 and Grism 13
(3985-9315A, 18A resolution). Classifications were done with SNID (Blondin &
Tonry, 2007, ApJ, 666, 1024). Classification spectra can be obtained
from http://www.pessto.org (via WISeREP).
GCN Circular 18418
Subject
LIGO/VIRGO G184098 : PESSTO classifications of PanSTARRS transients in the northern region
Date
2015-10-13T12:03:31Z (10 years ago)
From
S. J. Smartt at Queens U Belfast <s.smartt@qub.ac.uk>
M. Fraser (Cambridge), J. Lyman (Warwick), H. Campbell (Cambridge), T.-W. Chen (Bonn), A. De Cia (ESO), I. Manulis (Weizmann), C. Inserra (QUB), K. Maguire (QUB), E. Cappellaro (INAF), S. J. Smartt (QUB), K. W. Smith (QUB), M. Sullivan (Southampton), S. Valenti (LCOGT), O. Yaron (Weizmann), D. Young, D. Wright (QUB), K. Chambers, M. Huber, E. Magnier, H. Flewelling, C. Waters, J. Tonry, A. Schultz, N. Primak (IfA, University of Hawaii), C. Stubbs (Harvard)
Following the Pan-STARSS discovery (Smartt et al, GCN 18394) of candidates
in the G184098 northern error region, PESSTO, the Public ESO Spectroscopic
Survey for Transient Objects (see Smartt et al. 2015, A&A, 579,
40 http://www.pessto.org), reports two further classifications.
PS15cej is a type Ia supernova around maximum light (spectrum taken on
2015-10-02) at z=0.049.
PS15cel is a type II supernova, probably 2-3 weeks after maximum
light (spectrum taken on 2015-10-12) at z=0.05
All observations were performed on the ESO New Technology Telescope at
La Silla using EFOSC2 and Grism 13 (3985-9315A, 18A resolution).
Classifications were done with SNID (Blondin &
Tonry, 2007, ApJ, 666, 1024). Classification spectra can be obtained
from http://www.pessto.org (via WISeREP).
Eight optical transients have been detected to date (see GCN 18394, 18395).
The sky positions and G184098 localisation region is now visualised
on a plot on the GraceDB event webpage. Six have spectral
classifications, while the other two are most likely
now fainter than i ~ 21 mag.
We thank Leo Singer and Roy Henderson for assistance in clarifying the
contours, healpix interpretation and upload mechanisms.
GCN Circular 18914
Subject
LIGO/VIRGO G184098: Summary of VLA results for iPTF15cyk
Date
2016-01-21T14:42:07Z (9 years ago)
From
Nipuni Palliyaguru at TTU <nipunipalliyaguru9@gmail.com>
N. Palliyaguru (TTU) and A. Corsi (TTU) report on behalf of a larger
collaboration:
We imaged again the position of the iPTF transient 15cyk (Singer et al. GCN
18337) located in the error region of LIGO/Virgo G184098 (LVC GCN 18330),
with the Karl G. Jansky Very Large Array (VLA). A provisional reduction of
the images collected during our observations gives the upper-limits (3
sigma) reported in the summary below, where we also include the results of
the first VLA epoch (Palliyaguru et al. GCN 18420, GCN 18474).
Epoch 1 (15 Oct 2015 11:20:32-12:05:27 UT)
Freq | Flux (3 sigma UL)
-----------------------------------
6 GHz | < 45 uJy
===================================
Epoch 2 (06 Dec 2015 04:52:11-05:00:07 UTC)
Freq | Flux
-----------------------------------
6 GHz | < 34 uJy
===================================
Epoch 3 (20 Jan 01:55:31-02:59:40 UTC)
Freq | Flux
-----------------------------------
6 GHz | < 30 uJy