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').
- GRB 030328, optical photometry
- GRB030329: R band light curve by MASTER
- GRB030329 - Light curve flattening
- GRB 030329: SARA Optical Observations
- GRB 030324, optical search
- GRB030329 - near contemporaneous optical limits from CONCAM
- GRB030329: R and B observations
- GRB 030329, optical observations
- GRB030329: Optical observations
- GRB030328: X-ray Fading and Spectrum Measured with Chandra
- GRB030329a: detection by Konus-Wind
- GRB030329b: detection by Konus-Wind and Helicon-CoronasF
- GRB 030329: Light curve observed during the change of its slope.
- GRB030329, BVRcIc field photometry
- GRB030329, SPM optical observations
- GRB 030329: Optical Decay
- Redshift of GRB 030329
- GRB030329: ROTSE network observes steepening of decay curve
- GRB 030329, optical photometry
- GRB 030329: Optical decay and synthesis
- GRB030329 optical observations
- GRB030329: optical spectroscopy with the TNG
- GRB 030329: Radio Observations
- GRB 030329, optical spectroscopy
- GRB 030329: still bright
- GRB 030329: Optical pre-Imaging
- GRB 030329: visual observations
- GRB 030329: Upper limit from 5.6 hours before trigger
- GRB030328: R optical observation
- GRB030328: X-ray Afterglow Observed with Chandra
- GRB 030323: Gemini South VRI obsevations.
- GRB030329: Optical observations
- GRB 030329, R-band observations, supplement
- GRB030329 optical observations
- GRB030329:optical observations by MASTER
- GRB 030329: optical observations
- GRB 030329, R-band observations
- GRB 030329: OT B and R photometry, decline rate
- GRB030329: Upper limits from recent and historical observations.
- GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
- RXTE detection of GRB 030329 afterglow
- GRB 030329: Optical Afterglow Observations
- GRB 030329: precise position from Kyoto images
- GRB 030328 Optical Observations
- GRB030328: Decay index
- GRB 030328: Optical observations
- GRB 030328: optical observations
- GRB 030329: Optical afterglow fading
- GRB 030329 follow-up
- GRB 030329: Optical afterglow candidate
- GRB 030329: OT candidate
- GRB 030329: Optical afterglow candidate
- GRB 030328: OT photometry
- GRB030328: optical spectroscopy at TNG
- GRB030328: optical photometry at the TNG
- VLT spectra of GRB 030328
- GRB 030328, optical spectroscopy
- GRB 030328, optical observations
- GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
- GRB 030328: Optical observations
- Re: GRB 030328: Finding chart
- GRB 030328: Finding chart
- GRB 030328: Optical afterglow candidate
- GRB030323 optical observations
- GRB030324 optical observation
- GRB030131, BVRcIc field photometry
- Possible GRB030323 localized by INTEGRAL
- IPN triangulation of GRB030325 (final analysis)
- GRB030323: Detection on 2003/03/24
- IPN triangulation of GRB030326 (single small error box)
- GRB 030323: SARA Optical Observations
- IPN triangulation of GRB030325 (single small error box)
- GRB030324, optical observations
- GRB030324, optical observations
- IPN triangulation of GRB030325 (two small error boxes)
- GRB 030324: TAROT optical observations
- GRB030323: V, R, I photometry
- GRB 030324 (HETE #2641): Optical observations
- GRB030324, Optical Observations
- GRB030323: Upper limits from recent and historical observations.
- GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
- GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
- GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
- VLT/FORS2 spectra of GRB 030323
- GRB030323, ROTSE-III detection of possible optical counterpart
- GRB030323, optical observations
- GRB030324, BVRcIc field photometry
- GRB030323, possible optical counterpart
- GRB030323, BVRcIc field calibration
- GRB 030324 optical observations
- GRB 030320: Optical Observations
- GRB 030324, optical observations
- IPN triangulation of GRB030320B (annulus)
- IPN triangulation of GRB030320 (small error box)
- IPN triangulation of GRB030320
- Possible GRB 030320 localized by INTEGRAL
- GRB030226, addendum to GCN 1892
- IPN upper limit to a GRB associated with SN2003L
- IPN triangulation of GRB030317 (annulus)
- IPN triangulation of GRB030307 (annulus)