README web version of /home/usg/OPS/MTS/readme_xml/readme_84041400

Principal Investigator Email Address

```
klose@tls-tautenburg.de
```

Estimated Total Execution Time (hours, including overheads)

```
1 hr
```

General Description

Goal: Deep imaging in R and K of the error circle of a GRB that had no
 detected optical afterglow despite of a deep and rapid follow-up observation. This
 is called a dark burst. The proposal aimes to find the host galaxies of such bursts.
 There are three possibilities: (a) very high redhift (the optical afterglow was
 Lyman droped out), (b) extinction by dust in the host galaxy, (c) intrinsic faintness
 of the optical SED of the afterglow. which of these possibilities is the most likely
 one shall be decided on a characterization of the R-K colors of all galaxies in
 the (r~10 arcsec) X-ray error circles of several dark bursts.

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

```
none
```

Time-Critical Aspects

```
none
```

Special Execution Requirements

The OB has 240 arcsec offset in both Alpha and Delta coordinates in the
 acquisition
template. Therefore, the center of the field at the end of preset should
correspond to the first finding chart. The main target should be in Q4 and a
zoomed view is shown on the second finding chart. It is possible that the
target is very faint, and therefore not visible on the individual images, but
its location should be on the Q4 - please check using the second finding
chart.

Special Calibration Information

```
none
```

ToO Information

```
not a ToO
```

ToO Activators List

---(Empty)---

Is this a Pre-imaging run ?

```
false
```

Pre-imaging Requirements

---(Empty)---

Do all your OBs comply with the instrument-specific requirements listed on the instrument-specific Phase 2 web page ?

If this is a pre-imaging run, did you select PRE-IMAGING for the Observing Category for each Observing Template ?

```
N/A
```

Do all your finding charts comply with both the general and instrument-specific Phase 2 Web Pages ?

If you submitted OBs for standard stars, did you specify the magnitude and spectral type of all standard stars in the OBs ?

```
N/A
```

Have you included OBs for any calibrations that you need but which are not part of the Calibration Plan ?

```
N/A
```

If you are observing Moving Targets, have you attached suitable ephemeris files to your OBs?

```
N/A
```

If you have preferences which OBs should be executed first, did you make use of the User Priority field in the OBs ?

```
N/A
```

If this is a run that requires coordinated observations with other facilities, did you give proper instructions in the Time-Critical Aspects Section ?

```
N/A
```

Did you specify suitable guide stars for all your OBs using Guidecam ?

Did you check that the chosen guide stars are suitable for all the offset positions and that they do not produce unacceptable vignetting of the field of view ?

Last creation of page: Tue Oct 6 15:40:31 2009
If you have comments, please contact usd-help@eso.org