GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"14327 results found.
- Radio Detection of SGR 0501+4516: Retraction
- Swift trigger 322590: BAT detection of a possible burst
- SGR 0501+4516: Decline in Activity
- SGR 0501+4516: Swift XRT measure of the spin period
- GRB080823: Fermi Gamma-ray Burst Monitor detection
- GRB 080824: Fermi Gamma Ray Burst Monitor detection
- GRB080825C: GLAST Burst Monitor detection
- Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
- Radio Detection of SGR 0501+4516
- GRB 080822B, Swift-BAT refined analysis
- SGR 0501+4516: UKIRT detection of possible infra-red counterpart
- New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
- SGR 0501+4516: optical observations
- Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
- GRB 080822B: Swift detection of a burst
- GRB080818B: GLAST Burst Monitor detection
- GRB 080822: Swift detection of a short burst
- GLAST Burst Monitor detection of a GRB: 080816B
- GLAST Burst Monitor detection of GRB 080818
- GLAST Burst Monitor detection of GRB080817B
- GLAST Burst Monitor detection of GRB 080817
- GLAST Burst Monitor detection of GRB080816
- GLAST Burst Monitor detection of GRB 080812
- Radio detection of GRB 080810 with the VLA
- GLAST Burst Monitor detection of GRB 080810
- GRB 080810: D50 optical observation
- GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
- GRB 080810: Swift detection of a burst with a bright optical afterglow
- GRB 080804: GROND observations
- GRB 080804: Swift/UVOT Refined Analysis
- GRB 080805: GROND detection of possible afterglow
- GRB 080805: Swift detection of a burst
- GRB 080804: Swift detection of a burst with optical afterglow
- GRB 080804: ROTSE-III Detection of Optical Counterpart
- GRB 080802: Swift detection of a probable burst
- GRB 080727A: Early IR observations
- GRB 080727B: KAIT photometry and an early lightcurve break
- GRB 080727B: REM NIR afterglow prompt detection
- GRB 080727C: Swift detection of a burst
- Swift detection of XTE J1701-407
- GRB 080727B: Swift/UVOT Upper Limits
- GRB 080727A: Swift-XRT refined analysis
- GRB 080727B: Swift detection of a bright burst
- GRB 080727: Swift detection of a burst
- GRB080723B: Swift/UVOT Upper Limits
- GRB 080725: Swift detection of a burst
- GRB 080723B: Detection and Localization by SuperAGILE
- GRB 080723: Swift detection of a burst
- TNG/DOLORES redshift for GRB080721
- GRB 080721: UVOT Follow-Up Observations
- GRB 080721: Swift detection of a burst with a bright optical counterpart.
- Trigger 317393: Swift detection of a possible GRB
- Trigger 317205: Swift detection of an outburst from XTE J1701-407
- GRB 080714: GROND confirmation of the optical/NIR afterglow
- GRB 080714: Swift/UVOT Detection of an Optical Afterglow
- GRB 080714: Swift detection of a burst
- GRB 080710: Lick IR detection
- GRB080710: Swift/UVOT observations
- GRB 080710: Swift detection of a burst
- GRB 080707: VLT redshift
- GRB 080707: GROND Detection of the Optical Afterglow Candidate
- GRB 080707: Swift detection of a burst
- Trigger 316063: Swift detection of a transient
- GRB 080703: Swift detection of a burst with optical afterglow
- GRB 080703A: ROTSE-III Detection of Optical Counterpart
- No radio detection from the short GRB 080702A
- Swift Trigger 315630: Probably not a GRB
- GRB 080702: Swift detection of a short burst
- Trigger 315630: Swift detection of a possible burst
- GRB 080701: Swift detection of a burst
- GRB 080625:Swift-XRT detection of the afterglow
- GRB 080625: Swift/UVOT Detection of an Optical Afterglow
- GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
- GRB 080623: Swift detection of a burst
- GRB 070809: Putative host galaxy and redshift
- GRB 080613A: Swift-XRT detection of the afterglow
- GRB080613A: Swift/UVOT Upper Limits
- GRB 080613B: Swift detection of a burst
- Swift observations of BAT Slew Survey event (Trigger=010)
- GRB 080603A: final Swift-XRT observations.
- GRB 080607: AGILE-MCAL observation of the prompt emission
- GRB 080605: TLS 3rd Epoch - Source Confusion
- VLA detection of INTEGRAL burst GRB 080603A
- GRB 080607 - PAIRITEL NIR detection
- GRB 080607: Swift detection of a burst with optical afterglow
- GRB 080607: ROTSE-III Detection of Optical Counterpart
- Possible VLA radio detection on INTEGRAL burst GRB 080603A
- GRB 080605: GROND detection of the optical afterglow candidate
- GRB 080605: Swift detection of a burst with an optical afterglow
- GRB 080603B: PAIRITEL infrared detection
- GRB 080603A: PAIRITEL infrared detection
- GRB080604: HET redshift retraction
- GRB 080603A: Swift-XRT detection of the afterglow
- GRB 080603B: Swift/UVOT detection of the afterglow
- GRB 080603A: Swift/UVOT detection of the afterglow
- GRB080604: confirmation of optical afterglow
- GRB 080604: Swift detection of a burst with an optical afterglow
- GRB080603B: NOT redshift
- GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
- GRB 080603B: Swift detection of a burst with optical afterglow