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"19532 results found.
- GRB 080129: Swift/UVOT Refined Upper Limits
- Swift/UVOT observations of GRB080130
- GRB 080130(?): Swift XRT observation
- GRB 080129: Swift-XRT refined analysis
- GRB 080129: KAIT optical limits
- GRB 080129, Swift-BAT refined analysis
- GRB 080129: TAROT La Silla observatory optical observations
- GRB 080129: Gemini-South photometry
- GRB 080129: GROND detection in all bands, and fading
- GRB 080129: GROND detection of the optical/NIR afterglow, and fading
- GRB 080129: Enhanced Swift-XRT position
- GRB 080129: Swift XRT position
- GRB 080129 (?): UVOT Upper Limits
- GRB 080129 (?): Swift detection of a possible burst
- A new website of high-level data products for Swift GRBs
- GRB 080121: Upper limit on X-ray afterglow
- GRB 080123 : Suzaku WAM observation of the prompt emission
- Swift trigger(=301779) is not a GRB
- GRB 080121: Swift/UVOT upper limits
- SNe 2008D and 2007uy: Chandra Detections
- GRB 080121: Enhanced Swift-XRT position
- Two non-burst Swift SubThreshold triggers
- IPN triangulation of GRB080122
- GRB 080121: Nearby SDSS galaxies
- GRB 080121: Swift-BAT detection of a very weak, short burst
- GRB 080123: Swift-XRT refined analysis
- GRB 080123: Swift/UVOT refined analysis
- GRB 080123, Swift-BAT refined analysis
- GRB 080123: Enhanced Swift-XRT position
- GRB 080123: Swift detection of a short burst
- VLA radio upper limit on GRB 080120
- GRB 080120: Swift-XRT refined analysis
- UVOT detection of GRB080120
- GRB 080120: GROND detection
- GRB080120: Swift XRT position
- Swift UVOT Monitoring of the SN 2008D Brightening (Transient in NGC 2770)
- Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
- XRB 080109/SN 2008D: Early decline in brightness and change in colors
- XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
- 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
- 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