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"21263 results found.
- GRB070223: Swift/UVOT refined analysis
- GRB 070223: Optical-IR observation with KANATA
- GRB070223: MASTER-VWF-Kislovodsk observations
- GRB070223 - SDSS Pre-Burst Observations
- GRB070223: Swift burst
- Konus-Wind and Konus-A observations of GRB 070220
- GRB 070220: MITSuME Okayama Optical Observation
- GRB 070220 Swift-BAT Refined Analysis
- Swift/UVOT refined analysis of GRB070220
- GRB 070209: Swift XRT refined analysis
- GRB 070220: Observation with the KANATA 1.5m telescope
- GRB 070219: Gemini Observations
- GRB 070220: Swift detection of a burst
- GRB070219: MASTER-VWF-Kislovodsk observations
- GRB 070219: Swift/UVOT Upper limits
- GRB 070219: I-band observations
- GRB 070219: optical TNG observations
- GRB 070219: ROTSE-III Optical Limits
- GRB070219 - SDSS Pre-Burst Observations
- GRB 070219: Swift detection of a burst
- GRB 070125 observations with the GMRT
- GRB 070129: MDM I-band Detection
- GRB 070209: Swift XRT analysis
- GRB 070201: clarification on localization and Konus-Wind spectra
- IPN localization of very intense short GRB 070201
- GRB 070208: RAPTOR detection of early afterglow onset
- GRB 070208, Swift-BAT refined analysis
- GRB070208 - SDSS Pre-Burst Observations
- GRB 070208: Afterglow confirmation from P60
- GRB 070208: ROTSE-III Optical Limits
- GRB 070208: Swift detection of a burst
- GRB 070125 detection with CARMA
- GRB 070129: afterglow confirmation
- GRB070124: Swift-XRT Follow-up Observation
- GRB070126: Swift-XRT Observation
- GRB 070125: further AAVSO optical observations
- GRB 070129: Swift/UVOT Upper limits
- GRB 070129: Xinglong TNT optical Upper Limit
- GRB 070129: Swift-XRT Refined Analysis
- GRB 070129: VLT observations
- GRB 070125: An IR Point Source and an Apparent Host Galaxy
- GRB 070129: Swift detection of a burst
- GRB 070126: Swift/UVOT refined analysis
- Konus-Wind observation of GRB 070125
- GRB 070125: optical observations
- GRB 070126: VLT observations
- GRB 070124: Suzaku WAM observation of the prompt emissions
- GRB 070126, Swift-BAT refined analysis of a very faint burst
- GRB070125: Optical observation by Kanata
- GRB070124: Swift-XRT Observation
- Possible GRB 070126: Swift/UVOT Upper Limit
- GRB 070125: UVOT Observations of a Fading Optical Afterglow
- GRB 070125: Xinglong TNT optical observations
- GRB070125: Swift-XRT Refined Analysis
- GRB 070125: SARA detection in R
- GRB 070125: P60 Optical Afterglow Candidate
- GRB 070126?: Swift detection of a possible burst
- GRB070125 redshift request
- RHESSI Spectrum of GRB070125
- Konus-Wind observation of short hard GRB 070124
- IPN localization of GRB070124 (short duration, hard spectrum)
- GRB 070110: optical break
- GRB 070107: Suzaku WAM observation of the prompt emission
- GRB 070110, Swift-BAT refined analysis
- GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
- GRB 070110: Swift detection of a burst with a possible optical afterglow
- GRB 070107: Swift detection of a burst
- VLA observation of GRB 061222B
- VLA detection of GRB 061222A
- GRB070103: APO SPIcam i' and z' limits
- GRB070103: KPNO 4m+FLAMINGOS J limit
- GRB 070103: Swift/UVOT Upper limits
- GRB 070103: NOT observations
- GRB 070103: TAROT Calern observatory optical observations
- erratum : SDSS Pre-burst Observations of GRB061126
- Konus-Wind observation of GRB 061222A
- GRB 061210: Swift/XRT Astrometry Correction
- GRB 061222A: Confirmation of Gemini Afterglow Candidate
- GRB 061222A: Xinglong Optical Limit
- GRB 061222A: Gemini Afterglow Candidate
- GRB 061222B, Swift-BAT refined analysis
- GRB061222A Swift/UVOT: Upper Limits
- GRB 061222B: Swift/UVOT Upper limits
- GRB 061222B: Observation with the KANATA 1.5m telescope
- GRB 061222A: Observation with the KANATA 1.5m telescope
- GRB 061222B: BOOTES-IR optical observations
- GRB 061222B: SARA upper limit
- GRB 061222B: REM NIR/optical observations
- GRB 061222B: TAROT La Silla observatory optical observations
- GRB 061222B: Swift detection of a burst
- GRB 061222A: Prompt ROTSE-III Optical Limits
- GRB 061222: Swift detection of a burst
- GRB 061218: TAROT La Silla observatory optical observations
- GRB 061217: TAROT Calern observatory optical observations
- GRB 061218: TORTOREM optical upper limits
- GRB 061218, Swift-BAT refined analysis
- GRB061217: VLT NIR observations
- GRB 061218, SMARTS optical/IR observations
- GRB 061218: REM prompt observations
- Swift triggers (#251863) on a possible burst