Fix CWB BBH citation for sky maps
Looking at an example superevent (https://gracedb-test.ligo.org/superevents/S240612t/view/) that includes both CWB AllSky
and CWB BBH
, we see that it uses the first for the citation of the sky map even though the sky map was created by the latter.
SUBJECT: LIGO/Virgo/KAGRA S240612t: Identification of a GW unmodeled transient candidate
The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA
Collaboration report:
We identified the unmodeled transient candidate S240612t during real-time
processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston
Observatory (L1) at 2024-06-12 13:00:28.435 UTC (GPS time: 1402232446.435). The
candidate was found by the cWB [1], cWB BBH [2], and GstLAL [3] analysis
pipelines.
S240612t is an event of interest because its false alarm rate, as estimated by
the online analysis, is 3.1e-08 Hz, or about one in 1 year, 12 days. The
event's properties can be found at this URL:
https://gracedb-test.ligo.org/superevents/S240612t
The classification of the GW signal, in order of descending probability, is BBH
(51%), Terrestrial (49%), BNS (<1%), or NSBH (<1%).
Assuming the candidate is astrophysical in origin, the probability that the
lighter compact object is consistent with a neutron star mass (HasNS) is <1%.
[4] Using the masses and spins inferred from the signal, the probability of
matter outside the final compact object (HasRemnant) is <1%. [4] Both HasNS and
HasRemnant consider the support of several neutron star equations of state. The
probability that either of the binary components lies between 3 and 5 solar
masses (HasMassGap) is <1%.
Two sky maps are available at this time and can be retrieved from the GraceDB
event page:
* cwb.multiorder.fits,0, an initial localization generated by cWB [1],
distributed via GCN notice about a minute after the candidate event time.
* cwb.multiorder.fits,1, an initial localization generated by cWB [1],
distributed via GCN notice about 6 minutes after the candidate event time.
The preferred sky map at this time is cwb.multiorder.fits,1. For the
cwb.multiorder.fits,1 sky map, the 90% credible region is 2468 deg2.
For further information about analysis methodology and the contents of this
alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide
https://emfollow.docs.ligo.org/.
[1] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004
[2] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018
[3] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and
Ewing et al. (2023) arXiv:2305.05625
[4] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe