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"19938 results found.
- XRF 080109 in NGC2770: Detectable Superluminal Motion
- XRF in NGC 2770: Search for X-ray periodicity
- Refined Swift-XRT analysis of the transient in NGC 2770
- Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
- Swift UVOT Observations of the X-ray transient in NGC 2770
- Early OT detection of XRF in NGC 2770 in Asiago frames
- Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
- GRB 071227: Suzaku WAM observation of the prompt emission
- Further Swift-BAT analysis of GRB 071227
- Konus-Wind observation of GRB 071227
- GRB 071227: Swift-XRT refined analysis
- GRB071227: Swift/UVOT refined analysis
- Swift-BAT refined analysis of short GRB 071227
- GRB 071227: Swift detection of a burst
- GRB 070429B: Possible UVOT Detection of an Optical Afterglow
- Swift-BAT trigger 298308 is not a GRB
- GRB 071208?: Swift detection of a possible burst
- GRB 071129, Swift-BAT refined analysis
- GRB 071129: Swift detection of a burst
- Disregard the "GRB 071126" position
- GRB 071126: Enhanced Swift-XRT position
- VLA radio detection of GRB 071122
- GRB071122: Swift/UVOT Observations
- GRB 071122, Swift-BAT refined analysis
- GRB 071122 Swift XRT position update sent in error.
- GRB 071122 Swift-XRT refined analysis
- GRB 071122: ROTSE-III Optical Limits
- GRB 071122: Swift detection of a burst
- Swift/UVOT observations of GRB071118
- GRB 071117: Swift-XRT revised position
- Konus-Wind and Konus-A observations of GRB 071117
- Swift XRT follow-up observations of GRB071008
- Swift/UVOT upper limits for GRB 071117
- GRB071118: Swift XRT refined analysis
- GRB 071118, Swift-BAT refined analysis
- GRB 071117: TAROT La Silla observatory optical observations
- GRB 071118: Swift detection of a burst
- GRB 071117: Swift-XRT refined analysis
- GRB 071117, Swift-BAT refined analysis
- GRB 071117: Swift/XRT position
- GRB 071117: Initial Swift/UVOT observations
- GRB 071117: Swift detection of a bright burst
- Swift detection of MXB 0656-072
- VLA radio upper limit on GRB 071112C
- ATCA radio observations of short hard burst GRB 071112B
- Correction to the Swift-BAT Transient Identification (trigger=296683)
- GRB 071112C: Swift-BAT refined analysis
- GRB 071112C: Swift/UVOT observations
- GRB 071112C: Swift XRT refined analysis
- Swift UVOT upper limits of GRB071112B
- GRB 071112B: Swift-XRT preliminary analysis
- GRB 071112B, Swift-BAT partial refined analysis of the SHB
- Swift-BAT trigger 296491 is not a GRB
- GRB 071112C: TAROT Calern observatory optical observations
- Swift XRT follow-up observations of GRB071028B
- GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
- GRB 071112B: ROTSE-III Rapid Optical Limits
- GRB 071112C: Swift detection of a burst with an optical counterpart
- GRB 071112B: Swift detection of a short hard burst
- GRB 071112: Swift detection of a possible burst
- VLA IInd observation of INTEGRAL burst GRB 071109
- Swift/UVOT initial analysis of GRB071109
- GRB 071109: further Swift-XRT analysis
- No radio detection at Swift-XRT position
- GRB 071109: Swift-XRT possible X-ray counterpart
- GRB 071104: Swift-XRT Team Refined Analysis
- GRB 071104: Possible Swift UVOT Afterglow Candidate
- GRB 071104: Swift-XRT position
- Swift XRT and UVOT observations of GRB071028B
- GRB 071101, Swift-BAT refined analysis
- GRB 071101: Swift-XRT Team refined analysis
- GRB 071101: TAROT Calern observatory optical observations
- GRB 071101: Swift XRT position
- GRB 071101: BOOTES-2 prompt optical observations
- GRB 071101: a nearby galaxy
- GRB 071101: Swift detection of a burst
- GRB 071031, Swift-BAT refined analysis
- GRB 071031: Swift/UVOT detection of afterglow
- GRB 071031: Swift-XRT Team refined analysis
- GRB 071031: Swift detection of a burst with an optical counterpart
- GRB 071028B Swift-BAT detection of a burst
- Swift UVOT upper limits to GRB071028
- GRB 071028: Swift-XRT Team refined analysis
- GRB 071028, Swift-BAT refined analysis
- GRB 071028: Swift detection of a burst
- GRB 071025: Kuiper Telescope Optical Observations
- GRB 071018: Revised BAT position
- GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
- GRB071021: MARGE Optical Limits
- GRB071020, optical upper limit
- GRB 071025 Milagro GeV/TeV Observations
- Swift UVOT upper limits
- GRB 071025: Swift-XRT Team refined analysis
- GRB 071025, Swift-BAT refined analysis
- GRB 071025: Early Super-LOTIS Observations
- GRB 071025: ROTSE-III Refined Analysis
- GRB 071025: Swift XRT refined position
- GRB 071025: ROTSE-III Detection of Optical Counterpart
- GRB 071025: Swift detection of a burst
- GRB 071020: BTA spectroscopy