# Open Data Workshop **URL:** https://ask.igwn.org/c/open-data-workshop/5.md [Latest](https://ask.igwn.org/latest.md) · [Categories](https://ask.igwn.org/categories.md) · [Tags](https://ask.igwn.org/tags.md) --- ## [About the Open Data Workshop category](https://ask.igwn.org/t/about-the-open-data-workshop-category/12)
**Author:** [@jonah](https://ask.igwn.org/u/jonah)\ **Replies:** 1\ **Last updated:** [April 8, 2022, 6:00pm UTC](https://ask.igwn.org/t/about-the-open-data-workshop-category/12 "2022-04-08T18:00:33Z")
Discussion related to the Gravitational Wave Open Data Workshops. This can include questions about the tutorials, data challenge, lecture topics, or anything else related to the workshops. See all workshop materials at… --- ## [Course Certificate](https://ask.igwn.org/t/course-certificate/1496)
**Author:** [@rishaan](https://ask.igwn.org/u/rishaan)\ **Replies:** 11\ **Last updated:** [July 31, 2026, 4:34pm UTC](https://ask.igwn.org/t/course-certificate/1496 "2026-07-31T16:34:35Z")
Hi, I have an issue with the name displayed in the course completion certificate and would like to change it. Who can I reach out to for that? Is there a separate certificate to be received on completing the Data Chall… --- ## [Challenge Question certification](https://ask.igwn.org/t/challenge-question-certification/1492)
**Author:** [@Avika](https://ask.igwn.org/u/Avika)\ **Replies:** 7\ **Last updated:** [July 30, 2026, 3:56pm UTC](https://ask.igwn.org/t/challenge-question-certification/1492 "2026-07-30T15:56:05Z")
When and how will I get to know if I have been qualified for certificate on completion of challenge question? --- ## [Difficulties with running parameter estimation analysis in challenge #4](https://ask.igwn.org/t/difficulties-with-running-parameter-estimation-analysis-in-challenge-4/1507)
**Author:** [@denis](https://ask.igwn.org/u/denis)\ **Replies:** 2\ **Last updated:** [June 3, 2026, 4:47pm UTC](https://ask.igwn.org/t/difficulties-with-running-parameter-estimation-analysis-in-challenge-4/1507 "2026-06-03T16:47:53Z")
Dear Open Data Workshop community, I would like to query some help regarding the solving of challenge #4 on the parameter estimation task. I am trying to solve challenge #4 in the context of my gravitational waves under… --- ## [Tutorial 3.3 - Session crashed after using all available RAM](https://ask.igwn.org/t/tutorial-3-3-session-crashed-after-using-all-available-ram/1498)
**Author:** [@Anam19](https://ask.igwn.org/u/Anam19)\ **Replies:** 1\ **Last updated:** [May 11, 2026, 1:49pm UTC](https://ask.igwn.org/t/tutorial-3-3-session-crashed-after-using-all-available-ram/1498 "2026-05-11T13:49:32Z")
Hi, I am working on Tutorial 3.3. While running the code, my session keeps failing. I am getting the following error message: “Your session crashed after using all available RAM.” This is happening in both Google Col… --- ## [This was a really tricky one! sorry i didn't notice before posting thank you](https://ask.igwn.org/t/this-was-a-really-tricky-one-sorry-i-didnt-notice-before-posting-thank-you/1483)
**Author:** [@jayashree](https://ask.igwn.org/u/jayashree)\ **Replies:** 0\ **Last updated:** [April 30, 2026, 10:50pm UTC](https://ask.igwn.org/t/this-was-a-really-tricky-one-sorry-i-didnt-notice-before-posting-thank-you/1483 "2026-04-30T22:50:49Z")
--- ## [Light and Gravitational\_waves](https://ask.igwn.org/t/light-and-gravitational-waves/1469)
**Author:** [@TaoTang-xw](https://ask.igwn.org/u/TaoTang-xw)\ **Replies:** 1\ **Last updated:** [April 28, 2026, 4:11am UTC](https://ask.igwn.org/t/light-and-gravitational-waves/1469 "2026-04-28T04:11:09Z")
1. Introduction When the stones hit the water, they generate concentric waves that move away from the source, as shown in Fig.1. Fig.1.This an image of water waves. Gravitational\_waves are heard by LIGO. The interf… --- ## [Open Data Workshop 2026 Study Hubs](https://ask.igwn.org/t/open-data-workshop-2026-study-hubs/1411)
**Author:** [@mdubois](https://ask.igwn.org/u/mdubois)\ **Replies:** 34\ **Last updated:** [April 21, 2026, 9:34am UTC](https://ask.igwn.org/t/open-data-workshop-2026-study-hubs/1411 "2026-04-21T09:34:46Z")
The Open Data Workshop 2026 will take place in April (April 20-23)! As every year, study hubs can be organized by the workshop mentors and also by participants who would like to work on the tutorials and notebooks toget… --- ## [RESCEU (UTokyo) Open Data Workshop Study Hub 2026](https://ask.igwn.org/t/resceu-utokyo-open-data-workshop-study-hub-2026/1439)
**Author:** [@alvinli](https://ask.igwn.org/u/alvinli)\ **Replies:** 0\ **Last updated:** [April 2, 2026, 8:13am UTC](https://ask.igwn.org/t/resceu-utokyo-open-data-workshop-study-hub-2026/1439 "2026-04-02T08:13:30Z")
Main webpage: GWODWinTokyo2026 Information Date: 2026 April 25 (Sat), 10:00 - 18:00 JST Venue: RESCEU Seminar room (ground floor of Science building No. 4), The University of Tokyo Lectures will be broadcasted o… --- ## [Graviatational waves](https://ask.igwn.org/t/graviatational-waves/1390)
**Author:** [@Mohit\_2002](https://ask.igwn.org/u/Mohit_2002)\ **Replies:** 1\ **Last updated:** [October 9, 2025, 9:54pm UTC](https://ask.igwn.org/t/graviatational-waves/1390 "2025-10-09T21:54:20Z")
what is the nature and data sturcture of graviatational waves? --- ## [Which ASD to use in Challenge](https://ask.igwn.org/t/which-asd-to-use-in-challenge/1303)
**Author:** [@mdubois](https://ask.igwn.org/u/mdubois)\ **Replies:** 2\ **Last updated:** [June 2, 2025, 8:45am UTC](https://ask.igwn.org/t/which-asd-to-use-in-challenge/1303 "2025-06-02T08:45:29Z")
Dear all, We are working on the ODW challenge especially exercise 4. The data to use is taken from O2. However, by default bilby uses the ASD from O4. According to our colleagues, this could make a significant differen… --- ## [IFO 60Hz Line Noise](https://ask.igwn.org/t/ifo-60hz-line-noise/1298)
**Author:** [@kevinjos](https://ask.igwn.org/u/kevinjos)\ **Replies:** 2\ **Last updated:** [May 26, 2025, 5:07pm UTC](https://ask.igwn.org/t/ifo-60hz-line-noise/1298 "2025-05-26T17:07:56Z")
Thanks all for the great workshop! A couple talks showed 60Hz line noise in the US based IFOs. Where does line noise enter the strain data capture? For example, does it come in ADCs of the detector? I can quickly reason … --- ## [Deadline for the Data Challenge](https://ask.igwn.org/t/deadline-for-the-data-challenge/1306)
**Author:** [@Yashika](https://ask.igwn.org/u/Yashika)\ **Replies:** 1\ **Last updated:** [May 19, 2025, 4:56pm UTC](https://ask.igwn.org/t/deadline-for-the-data-challenge/1306 "2025-05-19T16:56:31Z")
It is mentioned in the github link that the deadline for submitting the data challenge is mentioned in the thinkific website. But I do not think it’s updated. May I please know the deadline to submit the challenge? --- ## [GW- Open data challenge](https://ask.igwn.org/t/gw-open-data-challenge/1309)
**Author:** [@Shreya02](https://ask.igwn.org/u/Shreya02)\ **Replies:** 1\ **Last updated:** [May 19, 2025, 4:55pm UTC](https://ask.igwn.org/t/gw-open-data-challenge/1309 "2025-05-19T16:55:11Z")
What is the due date for the GW open data challenge for May 2025? Will it still be considered if I submit the solutions late and complete the workshop nonetheless. Will I still get a completion certificate? --- ## [Open Data Workshop 2025 Study Hubs](https://ask.igwn.org/t/open-data-workshop-2025-study-hubs/1182)
**Author:** [@martinberoiz](https://ask.igwn.org/u/martinberoiz)\ **Replies:** 18\ **Last updated:** [May 8, 2025, 2:25pm UTC](https://ask.igwn.org/t/open-data-workshop-2025-study-hubs/1182 "2025-05-08T14:25:49Z")
The Open Data Workshop 2025 will start on May (May 12-14) we encourage participants to host or join “Study Hubs” to work through the tutorials and data challenges together. Study Hubs can be organized by the workshop m… --- ## [Gravitational Waves Flux](https://ask.igwn.org/t/gravitational-waves-flux/1118)
**Author:** [@Noor](https://ask.igwn.org/u/Noor)\ **Replies:** 2\ **Last updated:** [October 14, 2024, 11:31am UTC](https://ask.igwn.org/t/gravitational-waves-flux/1118 "2024-10-14T11:31:12Z")
Hello there, I want to ask about the flux of gravitational waves. How is it calculated and how can I obtain it using the tutorials of the Open Data Workshop? --- ## [2024 GW Open Data Workshop - Tutorial Questions - Day 1](https://ask.igwn.org/t/2024-gw-open-data-workshop-tutorial-questions-day-1/952)
**Author:** [@lupinlin](https://ask.igwn.org/u/lupinlin)\ **Replies:** 1\ **Last updated:** [June 21, 2024, 4:21am UTC](https://ask.igwn.org/t/2024-gw-open-data-workshop-tutorial-questions-day-1/952 "2024-06-21T04:21:51Z")
This post is to collect all the questions about the talk and tutorial resources on the first day of the 2024 GW ODW or the local study hub. --- ## [Q transform vs spectrogram](https://ask.igwn.org/t/q-transform-vs-spectrogram/1034)
**Author:** [@arata](https://ask.igwn.org/u/arata)\ **Replies:** 2\ **Last updated:** [May 10, 2024, 4:32pm UTC](https://ask.igwn.org/t/q-transform-vs-spectrogram/1034 "2024-05-10T16:32:09Z")
Can anyone explain me why we are doing Q-Transform to get time-frequency plot, if we can also get it using spectrogram. I don’t want to go into the details, just an overview answer. --- ## [Generating\_data.ipnyb](https://ask.igwn.org/t/generating-data-ipnyb/1012)
**Author:** [@Gennaro](https://ask.igwn.org/u/Gennaro)\ **Replies:** 1\ **Last updated:** [May 7, 2024, 7:41am UTC](https://ask.igwn.org/t/generating-data-ipnyb/1012 "2024-05-07T07:41:43Z")
I have this problem. Can anyone help me? --- ## [2024 GW Open Data Workshop - Tutorial Questions - Day 3](https://ask.igwn.org/t/2024-gw-open-data-workshop-tutorial-questions-day-3/954)
**Author:** [@lupinlin](https://ask.igwn.org/u/lupinlin)\ **Replies:** 2\ **Last updated:** [April 21, 2024, 3:26am UTC](https://ask.igwn.org/t/2024-gw-open-data-workshop-tutorial-questions-day-3/954 "2024-04-21T03:26:07Z")
This post is to collect all the questions about the talk and tutorial resources on the final day of the 2024 GW ODW or the local study hub. --- ## [2024 GW Open Data Workshop - Tutorial Questions - Day 2](https://ask.igwn.org/t/2024-gw-open-data-workshop-tutorial-questions-day-2/953)
**Author:** [@lupinlin](https://ask.igwn.org/u/lupinlin)\ **Replies:** 0\ **Last updated:** [April 12, 2024, 5:54am UTC](https://ask.igwn.org/t/2024-gw-open-data-workshop-tutorial-questions-day-2/953 "2024-04-12T05:54:48Z")
This post is to collect all the questions about the talk and tutorial resources on the second day of the 2024 GW ODW or the local study hub. --- ## [Open Data Workshop Study Hubs 2024](https://ask.igwn.org/t/open-data-workshop-study-hubs-2024/881)
**Author:** [@jonah](https://ask.igwn.org/u/jonah)\ **Replies:** 18\ **Last updated:** [April 17, 2024, 11:26pm UTC](https://ask.igwn.org/t/open-data-workshop-study-hubs-2024/881 "2024-04-17T23:26:38Z")
Study Hubs for Open Data Workshop 2024 For Open Data Workshop 2024 , we are encouraging participants to host or join “Study Hubs” to work through the tutorials and data challenges together. Study Hubs can be organized b… --- ## [Tutorials Questions - Day 1](https://ask.igwn.org/t/tutorials-questions-day-1/563)
**Author:** [@Apratim](https://ask.igwn.org/u/Apratim)\ **Replies:** 57\ **Last updated:** [February 12, 2024, 5:24pm UTC](https://ask.igwn.org/t/tutorials-questions-day-1/563 "2024-02-12T17:24:06Z")
Questions for Day 1 tutorials (May 15, 2023) can be posted here --- ## [Tutorial Questions - Day 2](https://ask.igwn.org/t/tutorial-questions-day-2/564)
**Author:** [@Apratim](https://ask.igwn.org/u/Apratim)\ **Replies:** 46\ **Last updated:** [January 2, 2024, 7:02pm UTC](https://ask.igwn.org/t/tutorial-questions-day-2/564 "2024-01-02T19:02:53Z")
Questions for Day 2 tutorials (May 16, 2023) can be posted here --- ## [How to do line removal in LIGO data?](https://ask.igwn.org/t/how-to-do-line-removal-in-ligo-data/832)
**Author:** [@BarryG](https://ask.igwn.org/u/BarryG)\ **Replies:** 2\ **Last updated:** [October 19, 2023, 5:52am UTC](https://ask.igwn.org/t/how-to-do-line-removal-in-ligo-data/832 "2023-10-19T05:52:36Z")
In the data downloaded from GWOSC, the data’s asd/psd contain spectra lines. I found some information of instrumental lines in LIGO, for example, O1 data has: But I don’t quite understand the parameters in the file pr… --- ## [Tutorial Questions - Day 3](https://ask.igwn.org/t/tutorial-questions-day-3/565)
**Author:** [@Apratim](https://ask.igwn.org/u/Apratim)\ **Replies:** 29\ **Last updated:** [September 8, 2023, 11:12pm UTC](https://ask.igwn.org/t/tutorial-questions-day-3/565 "2023-09-08T23:12:26Z")
Questions for Day 3 tutorials (May 17, 2023) can be posted here --- ## [Winners of the Data Challenge](https://ask.igwn.org/t/winners-of-the-data-challenge/773)
**Author:** [@Agata](https://ask.igwn.org/u/Agata)\ **Replies:** 2\ **Last updated:** [September 8, 2023, 12:18pm UTC](https://ask.igwn.org/t/winners-of-the-data-challenge/773 "2023-09-08T12:18:09Z")
We have reviwed the solutions to the Data Challenge submitted to thinkific before May 24 and here the winners: First place: team of Aswin P R and Ashique T Nizar Second place: Zheng Wu and Angelo Serrecchia (tied) T… --- ## [Optional Question 2.1 (Tutorial 3.1)](https://ask.igwn.org/t/optional-question-2-1-tutorial-3-1/790)
**Author:** [@mlazarow](https://ask.igwn.org/u/mlazarow)\ **Replies:** 0\ **Last updated:** [June 22, 2023, 9:26pm UTC](https://ask.igwn.org/t/optional-question-2-1-tutorial-3-1/790 "2023-06-22T21:26:16Z")
Hello, I am working through the optional problems in Tutorial 3.1 and I am having trouble with Question 2.1. Based on the text, I am creating a histogram of 100 samples of the log likelihood, frequency, and alpha value… --- ## [Get a certificate for the Open Data Workshop!](https://ask.igwn.org/t/get-a-certificate-for-the-open-data-workshop/767)
**Author:** [@jonah](https://ask.igwn.org/u/jonah)\ **Replies:** 0\ **Last updated:** [May 30, 2023, 4:51pm UTC](https://ask.igwn.org/t/get-a-certificate-for-the-open-data-workshop/767 "2023-05-30T16:51:01Z")
A number of workshop participants have asked: How do I get a certificate for the Open Data Workshop? The certificate is awarded automatically upon completing the Open Data Workshop Thinkific course. To get the certific… --- ## [Help with Data Challenge 3](https://ask.igwn.org/t/help-with-data-challenge-3/349)
**Author:** [@npurnima](https://ask.igwn.org/u/npurnima)\ **Replies:** 4\ **Last updated:** [May 30, 2023, 4:06pm UTC](https://ask.igwn.org/t/help-with-data-challenge-3/349 "2023-05-30T16:06:00Z")
I am using the tool q\_transform from pycbc to transforms the time series signal into a frequency-time plot and I am stuck with the following - how does changing q values affect the plot or what is the significance of … [Next page](https://ask.igwn.org/c/open-data-workshop/5.md?page=1)