JWST Observer
@jwstobserver.bsky.social
JWST Observer is managed by STScI and provides astronomers with the most up-to-date information, news, and events related to observing with JWST.
STScI received a total of 2,935 #JWST proposals requesting almost 101,751 hours of observing time for GO, Survey, Pure Parallel, Archival Research, Target of Opportunity, and Joint programs, with an oversubscription rate of 13:1. Get the details: ow.ly/Fmiq50Xqy9Q
November 12, 2025 at 3:23 PM
STScI received a total of 2,935 #JWST proposals requesting almost 101,751 hours of observing time for GO, Survey, Pure Parallel, Archival Research, Target of Opportunity, and Joint programs, with an oversubscription rate of 13:1. Get the details: ow.ly/Fmiq50Xqy9Q
The latest reference files for #JWST NIRSpec Multi-Object and Fixed Slit Spectroscopy deliver significant pathloss improvements on the point and uniform source flux calibrations. Read more: ow.ly/f9OW50XpWTz
November 11, 2025 at 2:17 PM
The latest reference files for #JWST NIRSpec Multi-Object and Fixed Slit Spectroscopy deliver significant pathloss improvements on the point and uniform source flux calibrations. Read more: ow.ly/f9OW50XpWTz
Join us for Webb Office Hours on November 13th at 11 am (ET) to get your data-related questions answered by #JWST experts. There is only 1 session this month: ow.ly/BXTO50V6VNJ
November 10, 2025 at 5:21 PM
Join us for Webb Office Hours on November 13th at 11 am (ET) to get your data-related questions answered by #JWST experts. There is only 1 session this month: ow.ly/BXTO50V6VNJ
Help us improve the #JWST user experience by providing feedback through our 2025 user survey: ow.ly/5xYs50XjGtu
October 29, 2025 at 12:58 PM
Help us improve the #JWST user experience by providing feedback through our 2025 user survey: ow.ly/5xYs50XjGtu
Join us for a special JWebbinar to continue discussions with the #JSWT Users Committee (JSTUC). Get the details: ow.ly/iQIv50Xe7SM
October 17, 2025 at 2:20 PM
Join us for a special JWebbinar to continue discussions with the #JSWT Users Committee (JSTUC). Get the details: ow.ly/iQIv50Xe7SM
For #JWST Cycle 5, proposals should be submitted even if observations appear non-schedulable in APT due to guide star availability in bright crowded fields. Get the details: ow.ly/qlTG50X8LK8
October 8, 2025 at 8:24 PM
For #JWST Cycle 5, proposals should be submitted even if observations appear non-schedulable in APT due to guide star availability in bright crowded fields. Get the details: ow.ly/qlTG50X8LK8
Join us for Webb Office Hours on October 9th and 23rd at 11 am (ET) to get your data-related questions answered by #JWST experts. APT and ETC experts will be available for proposal preparation questions during the October 9th session: https://ow.ly/BXTO50V6VNJ
October 6, 2025 at 4:02 PM
Join us for Webb Office Hours on October 9th and 23rd at 11 am (ET) to get your data-related questions answered by #JWST experts. APT and ETC experts will be available for proposal preparation questions during the October 9th session: https://ow.ly/BXTO50V6VNJ
#JWST Cycle 5 proposals can take advantage of NIRCam and NIRISS multistripe capabilities. Read more: https://ow.ly/E41350X5OrY
October 2, 2025 at 6:45 PM
#JWST Cycle 5 proposals can take advantage of NIRCam and NIRISS multistripe capabilities. Read more: https://ow.ly/E41350X5OrY
In the event of a potential partial U.S. government shutdown, STScI will extend the deadline for #JWST Cycle 5 proposals involving scientists who are unable to undertake research during that time. Get the details: ow.ly/pErA50X2eAi
September 25, 2025 at 3:00 PM
In the event of a potential partial U.S. government shutdown, STScI will extend the deadline for #JWST Cycle 5 proposals involving scientists who are unable to undertake research during that time. Get the details: ow.ly/pErA50X2eAi
Access all of the materials, including presentations, notes, exercises, and videos, covered during the 2025 JWST Summer School held in August: ow.ly/CW4150X0NQn
September 23, 2025 at 1:10 PM
Access all of the materials, including presentations, notes, exercises, and videos, covered during the 2025 JWST Summer School held in August: ow.ly/CW4150X0NQn
Join us for Webb Office Hours on September 11th and 25th at 11 am (ET) to get your data-related questions answered by #JWST experts. APT and ETC experts will be available for proposal preparation questions in the September sessions: ow.ly/BXTO50V6VNJ
September 9, 2025 at 2:24 PM
Join us for Webb Office Hours on September 11th and 25th at 11 am (ET) to get your data-related questions answered by #JWST experts. APT and ETC experts will be available for proposal preparation questions in the September sessions: ow.ly/BXTO50V6VNJ
Read the latest about JWST's Rocky Worlds Director's Discretionary Time program, including final targets and an upcoming information session: ow.ly/mgxA50WReQt
September 4, 2025 at 2:14 PM
Read the latest about JWST's Rocky Worlds Director's Discretionary Time program, including final targets and an upcoming information session: ow.ly/mgxA50WReQt
Don't wait! Check out the online resources STScI offers to help you prepare your #JWST Cycle 5 proposal: ow.ly/C0qU50WQofI
September 3, 2025 at 2:20 PM
Don't wait! Check out the online resources STScI offers to help you prepare your #JWST Cycle 5 proposal: ow.ly/C0qU50WQofI
New sky background images for #JWST's NIRISS Wide-Field Slitless Spectroscopy mode significantly improve the subtraction of the sky background in WFSS data. Read more: ow.ly/8U9e50WMevy
August 26, 2025 at 4:55 PM
New sky background images for #JWST's NIRISS Wide-Field Slitless Spectroscopy mode significantly improve the subtraction of the sky background in WFSS data. Read more: ow.ly/8U9e50WMevy
A new MIRI Wide Field Slitless Spectroscopy mode, which enables efficient spectroscopic observations of multiple sources in a single pointing, is available for #JWST Cycle 5. Get the details: ow.ly/Cq8G50WKcM5
August 22, 2025 at 1:01 PM
A new MIRI Wide Field Slitless Spectroscopy mode, which enables efficient spectroscopic observations of multiple sources in a single pointing, is available for #JWST Cycle 5. Get the details: ow.ly/Cq8G50WKcM5
Check out the next 4 JWebbinars offered in August and September to help the community prepare for #JWST Cycle 5: ow.ly/J9Zu50WFcK9
August 13, 2025 at 1:17 PM
Check out the next 4 JWebbinars offered in August and September to help the community prepare for #JWST Cycle 5: ow.ly/J9Zu50WFcK9
Join us for Webb Office Hours on August 14th and 28th at 11 am (ET) to get your data-related questions answered by #JWST experts: ow.ly/BXTO50V6VNJ
August 11, 2025 at 2:41 PM
Join us for Webb Office Hours on August 14th and 28th at 11 am (ET) to get your data-related questions answered by #JWST experts: ow.ly/BXTO50V6VNJ
Build 12.0 includes improvements for #JWST's MIRI, NIRCam, and NIRISS instruments as well as time-series observations. Read more: ow.ly/FPR650WAGse
August 6, 2025 at 2:36 PM
Build 12.0 includes improvements for #JWST's MIRI, NIRCam, and NIRISS instruments as well as time-series observations. Read more: ow.ly/FPR650WAGse
New models of the count rate better predict the decrease in future observing cycles. These models will be incorporated into upcoming Build 12.1 of the pipeline (expected November 2025) and Cycle 6 of the #JWST ETC. Get the details: ow.ly/YRFr50WyJh6
August 1, 2025 at 3:47 PM
New models of the count rate better predict the decrease in future observing cycles. These models will be incorporated into upcoming Build 12.1 of the pipeline (expected November 2025) and Cycle 6 of the #JWST ETC. Get the details: ow.ly/YRFr50WyJh6
We are pleased to announce the release of the #JWST Cycle 5 Call for Proposals for General Observer and Survey time and funding for Archival Research programs. Read more: ow.ly/IjWC50WyF62
August 1, 2025 at 2:49 PM
We are pleased to announce the release of the #JWST Cycle 5 Call for Proposals for General Observer and Survey time and funding for Archival Research programs. Read more: ow.ly/IjWC50WyF62
Version 5.0 of the #JWST ETC features added support for MIRI WFSS mode and 4 new NIRISS SOSS multi-stripe subarrays, easier sharing and better error messaging, and backend improvements to better support hundreds of simultaneous users. Get the details: ow.ly/xrs150WygRA
July 31, 2025 at 7:51 PM
Version 5.0 of the #JWST ETC features added support for MIRI WFSS mode and 4 new NIRISS SOSS multi-stripe subarrays, easier sharing and better error messaging, and backend improvements to better support hundreds of simultaneous users. Get the details: ow.ly/xrs150WygRA
Join us for Webb Office Hours on July 10th and 24th at 11 am (ET) to get your data-related questions answered by #JWST experts: ow.ly/BXTO50V6VNJ
July 9, 2025 at 5:05 PM
Join us for Webb Office Hours on July 10th and 24th at 11 am (ET) to get your data-related questions answered by #JWST experts: ow.ly/BXTO50V6VNJ
Build 11.3 includes an improved method to correct for MIRI Medium Resolution Spectrometer (MRS) cosmic ray “shower” artifacts. Get the details: ow.ly/VyRO50Wmtsa
July 8, 2025 at 4:56 PM
Build 11.3 includes an improved method to correct for MIRI Medium Resolution Spectrometer (MRS) cosmic ray “shower” artifacts. Get the details: ow.ly/VyRO50Wmtsa
Get the latest updates about #JWST's Rocky Worlds Director's Discretionary Time program, including new targets and first observations. Read more: ow.ly/PkY750Wbzv8
June 18, 2025 at 1:08 PM
Get the latest updates about #JWST's Rocky Worlds Director's Discretionary Time program, including new targets and first observations. Read more: ow.ly/PkY750Wbzv8