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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').
  1. GRB980329 IPN annulus
  2. GRB980329 optical observations
  3. GRB980329 near-IR observations
  4. GRB980329 near-IR observations
  5. GRB980329 optical observations
  6. GRB980329 infrared observations
  7. GRB980329 optical observations
  8. GRB980326 optical observations
  9. GRB980329 optical observations
  10. GRB980329 VLA observations
  11. GRB980329 near IR observations
  12. GRB980329 optical observations
  13. GRB980329 optical observations
  14. GRB980329 optical observations
  15. GRB980326 optical observations
  16. GRB980326 optical observations
  17. GRB980326 optical observations
  18. GRB980326 optical observations
  19. GRB970508 SAO RAS optical observations
  20. Optical Observations of GRB 970508
  21. GRB 971214: Redshift from Keck Observations
  22. Near-IR follow-up on GRB 971227
  23. GRB971214: Keck R & I-band Observations
  24. GRB 971227: Optical Observations
  25. Optical Observations of the GRB 971227 field
  26. Optical Observations on GRB 971227
  27. GRB971227: Plaskett R-band observations
  28. GRB 971227: Optical clarifications
  29. Optical Observations for GRB 971227
  30. GRB971227: Further CAHA R-band images
  31. GRB971227: LOTIS observations
  32. GRB 971227: CAHA R-band images
  33. GRB 971227: Optical observations
  34. GRB971214: Optical Observations and Calibrations
  35. Sub-millimeter Observations of GRB 971214 at the JCMT
  36. GRB 971214: EUVE Observations
  37. GRB 971214: Redshift from Keck Optical Observations
  38. GRB 971214: Redshift from Keck Optical Observations
  39. GRB 971214: Apache Point Observatory Optical Observations
  40. GRB 971214: KPNO Optical Observations
  41. Optical Observations of GRB 971214 at Keck
  42. GRB 971214: Optical Observations
  43. Radio Observations of GRB 971214 at the VLA
  44. GRB 971214: USNOFS Observations Summary
  45. GRB 971024: KPNO Optical Observations Summary
  46. GRB 971024: Refined analysis by USNOFS Observations
  47. GRB 971024: KPNO Optical Observations
  48. GRB 971024: USNO Observations
  49. GRB 970925: BATSE Localization
  50. IRAS 18119-1342 and the possible new SGR
  51. Possible new SGR from US Naval Observatory
  52. RXTE Observations of SGR 1814-13
  53. GRB 970828: Palomar Observations
  54. GRB 970228: Keck/LRIS Optical Observations

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