Please find the find submission of our mid-cycle proposal for observations of SGR 1935+2154.2081355703Assigned ID: 1373
----- Attempting Submission 1 (Sat Jan 30 22:49:37 GMT 2021) -----Please find attached our submission for GO 16505. The aim of these observations is to obtain a detection of the counterpart and the source is currently active. However, we also wish
to use the same orient as previous observations. Therefore we have asked for observations within the first ~2 weeks when the orient becomes available (end May 2021). Please
let us know in case of any questions or queries.-1554533024----- Attempting Submission 1 (Thu Mar 11 15:54:41 GMT 2021) -----From a soft gamma-repeater to a fast radio burstThe origin of the Fast Radio Bursts (FRBs) has become one of the central questions in contemporary astrophysics. Several lines of evidence have pointed to their association with some form of magnetar flare, occurring in external galaxies. However, this is by no means a unique explanation, with other viable models also suggested. A significant step forward in this field occurred with the apparent detection of a millisecond radio burst (essentially an FRB) from the Galactic magnetar SGR 1935+2154. This magnetar is one of the most active known and continues to undergo an unprecedented period of activity with an intensive ongoing campaign. Fortuitously, HST has previously observed the magnetar, locating an IR counterpart. Here we request a single orbit observation that will detect it in its current active state. This observation will enable us to test how the optical/IR emission appears after the FRB providing vital insight to other searches for optical/IR counterparts of FRBs in external galaxies. Furthermore, as the source is currently active and sufficiently bright for detection, a proper motion measurement with a 6-year baseline will be possible. The proper motion will enable the magnetar to be tracked back to its birth-site, testing its assocaition with a supernova remnant, as well as providing a route for comparing its velocity with that of the general pulsar population.The aim of this proposal is to obtain observations of SGR 1935+2154 to obtain a detection of its counterpart and a measurement (or limits) on its proper motion. Because the source is variable and active now the observations should be taken quickly. However, there is also a significant advantage to matching the orient of the observations with those taken previously. We will repeat the observational set-up previously used which is a simple 4-point dither pattern using the STEP reads for dynamic range.We have significant expertise in follow-up of transient sources including SGRs, GRBs, SNe, TDEs and other phenomena. Between us we are the PI's of well over 50 HST science proposals which have addressed a range of different scientific areas. Our record of publishing this data is very good, and we publish several papers per year based on our HST data. Our previous observations of SGR 1935+2154 are published in Levan, Kouveliotou & Fruchter 2018 ApJ 854 161.
We have the scientific and technical expertise to undertake these observations as well as the necessary resources and time to publish them in a timely manner.Stellar Physics and Stellar Types6falsefalsefalsefalsefalsefalsefalseSUPPORTEDEXT-STARNEUTRON STARJ2000J2000WFC3/IRImagingNoNoF140WPOS-TARGDITHER0.572LINE0.365falsefalse74.653418.528WFC3-IR-DITHER-BOX-MIN1false/private/var/folders/9d/znlr3gj56k5gg7kstwq1rs1w0000gn/T/OPVisit9955742533721572444.xmlThe scheduling data was generated by CASM 29.0.CASM was run in Phase II mode.(Tic-Visit
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:date "11-Mar-2021 16:43:50.0"
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