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Proposal Identification No.:

A2977 Arecibo Observatory

Date Received: 2015-Mar-02 14:17:08 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Mar 1 2015. This proposal has not been submitted before. Proposal Type: General Category: Sub-Category: Observation Category: Time Requested this semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Extragalactic 6 0 1 hour less than 100 GB

The HI mass of a gamma ray burst host galaxy at z=0.0334

We propose to use the Arecibo L-wide receiver to carry out a deep search for HI-21cm emission from the second closest known GRB host galaxy at z=0.0334, in order to measure its HI mass. While much information is available on the stellar masses, star formation rates and metallicities of GRB host galaxies, almost no information is available on their neutral gas mass and spatial structure. We have recently obtained the first detection and spatial mapping of HI-21cm emission in the closest known GRB host, measuring its HI mass and showing that the GRB progenitor star is likely to have formed due to an interaction between two HI clouds. Our proposed Arecibo observations will yield the total HI mass of the GRB host, and the relation between its HI and stellar masses. It will be used to plan follow-up mapping studies of the HI-21cm emission in the system, and future HI-21cm searches in a sample of GRBs out to z 0.25. We request 6 hours of time for the observation, including all overheads. Outreach Abstract: Gamma Ray Bursts are the most energetic sources in the Universe. They occur in external galaxies, and for some of them the light is reaching us from the infancy of the universe - when it was just a few hundred million years old (the universe today is 13.7 billion years old). Hence GRBs are useful tracers of the properties of the universe from its infancy. But our knowledge of the reason why GRBs occur, and the kind of galaxies they occur in, is very limited. One of the ma jor limitation is our knowledge of the amount of gas in the galaxies hosting GRBs, which can account for 50% (if not more) of the total mass of these galaxies. This pro ject is part of an ongoing campaign to quantify the amount of gas in some of the nearest known galaxies where GRBs have occurred. This will be a first step to be followed by detailed mapping of the gas, which can yield useful clues regarding the occurrence of extreme star formation and consequently a GRB in these galaxies.

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Name Maryam Arabsalmani Sambit Roychowdhury

Institution European Southern Observatory (ESO) Max-Planck-Institut fur Astrophysik Ё

E-mail marabsal@eso.org sambit@MPA-Garching.MPG.DE

Phone +49 89 3200 6516 +49 89 30000 2299

Student G no

Additional Authors
Martin Zwaan mzwaan@eso.org Nissim Kanekar nkanekar@ncra.tifr.res.in Palle MЁ er oll pmoller@eso.org

This work is part of a PhD thesis.

Remote Observing Request

Observer will travel to AO X Remote Observing In Absentia (instructions to operator)

Section I I - Time Request
The following times are in LST. For these observations night-time is not needed.

Begin ­ End Interval­Interval 05:20 ­ 06:50 ­ ­ ­

Days Needed at This Interval 4

Time Constraints (Must Be Justified in the Prop osal Text)

Section I I I - Instruments Needed
L-wide 2


Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned
1371.375 - 1377.625 This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz..

Section V - Observing List Target List
Ob ject: HG 060218 Redshift: 0.0334 RA: 03h21m39.7s Dec: +16d52m02s LST rise: 05:10:59 LST set: 06:55:14

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