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"14345 results found.
- GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
- GRB080310, detection of break in optical
- GRB 080310: Magellan redshift revision
- GRB 080310: Swift detection of a burst with optical afterglow
- GRB080307 BOAO optical afterglow observation - detection of a possible OT
- GRB 080307: BOAO imaging - retraction and new limit
- GRB 080307: Swift detection of a burst
- VLA possible radio detection of GRB 080229
- GRB 080303: Swift/UVOT follow-up of afterglow detection
- GRB 080303: Swift detection of a burst with optical afterglow
- GRB 080229: Faulkes Telescope South optical limit
- GRB 080229: Swift detection of a bright burst
- GRB080205: optical observations
- GRB 080218B: Swift detection of a burst
- GRB 080218: Swift detection of a burst
- GRB 080212: VLT optical rapid decay
- GRB 080212: REM refined analysis
- Swift/UVOT refined analysis of GRB080212
- GRB 080212: optical observations
- VLA non-detection of GRB 080210
- GRB 080212: Swift detection of a burst
- GRB 080210: Swift/UVOT Refined Analysis
- GRB 080210: VLT redshift
- GRB 080210: GOND detection in all bands and redshift upper limit
- GRB 080210: Swift detection of a burst with optical afterglow
- GRB 080210: TAROT La Silla observatory optical detection
- Swift detection of AX J1749.1-2639
- Swift Trigger 302777 is not a GRB
- GRB080207: Swift/UVOT refined analysis
- GRB 080207: Swift detection of a burst
- GRB 080205 optical upper limit
- GRB 080205: Swift/UVOT observations
- GRB 080205: KAIT OA detection
- GRB 080205: Swift detection of a burst
- GRB 080130: REM NIR observations
- GRB 080130?: Detection of a possible burst by BATSS
- GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
- GRB 080129: GROND detection in all bands, and fading
- GRB 080129: GROND detection of the optical/NIR afterglow, and fading
- GRB 080129 (?): Swift detection of a possible burst
- GRB 080121: Swift/UVOT upper limits
- Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
- GRB 080121: Swift-BAT detection of a very weak, short burst
- GRB 080123: Swift detection of a short burst
- UVOT detection of GRB080120
- GRB 080120: GROND detection
- XRF 080109 / SN 2008D: 1.4 GHz WSRT Radio Observations
- XRF 080109 / SN 2008D: WSRT Radio Detection
- NGC 2770B has the same redshift as NGC 2770
- Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
- Detailed Spectroscopic ID of SN 2008D (Transient in NGC 2770)
- Refined Swift-XRT analysis of the transient in NGC 2770
- Transient in NGC 2770: spectroscopic evidence for a SN
- Early OT detection of XRF in NGC 2770 in Asiago frames
- GRB071227: Swift/UVOT refined analysis
- GRB 071227: Swift detection of a burst
- GRB 070429B: Possible UVOT Detection of an Optical Afterglow
- GRB 071208?: Swift detection of a possible burst
- GRB 071129: Swift detection of a burst
- VLA radio detection of GRB 071122
- GRB071122: Swift/UVOT Observations
- GRB 071122: Swift detection of a burst
- Swift/UVOT observations of GRB071118
- Swift/UVOT upper limits for GRB 071117
- GRB 071118: Swift detection of a burst
- GRB 071117: Swift detection of a bright burst
- Swift detection of MXB 0656-072
- ATCA radio observations of short hard burst GRB 071112B
- Correction to the Swift-BAT Transient Identification (trigger=296683)
- GRB 071112C: optical observation
- GRB 071112C: Swift-BAT refined analysis
- GRB 071112C: Optical observations at Crni Vrh
- 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
- No radio detection at Swift-XRT position
- VLA prompt radio detection of the INTEGRAL burst 071109
- GRB 071101: Swift detection of a burst
- GRB 071031: Swift/UVOT detection of afterglow
- GRB 071031: VLT high-resolution spectroscopy
- GRB 071031: GROND detection in all bands
- GRB 071031: Swift detection of a burst with an optical counterpart
- GRB 071028B Swift-BAT detection of a burst
- GRB 071028: SARA observations of variable source
- Swift UVOT upper limits to GRB071028
- GRB 071028: Swift detection of a burst
- GRB 071018: Revised BAT position
- Swift UVOT upper limits
- GRB 071025: R/I-band update
- GRB 071025: ROTSE-III Refined Analysis
- GRB 071025: I-detection, R-dropout?
- GRB 071025: ROTSE-III Detection of Optical Counterpart
- GRB 071025: Swift detection of a burst
- GRB 071021: R-band detection and analysis
- GRB 071020: BTA spectroscopy
- GRB071021: Optical+NIR observations
- Possible radio detection of GRB 071021 with the VLA
- Optical observations of GRB 071020