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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').
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"

26483 results found.

  1. GRB 980923 BATSE Observations
  2. SGR1900+14, BeppoSAX-GRBM observations
  3. GRB970508 optical observations
  4. GRB971214, association with a Galactic star?
  5. GRB980519, Optical Observations
  6. GRB980703 - BeppoSAX/GRBM detection
  7. GRB980703 optical photometry
  8. GRB 980703: BATSE Observations
  9. GRB980703 optical observations
  10. GRB980703: Radio transient
  11. GRB 980703: Spectrum of the proposed optical counterpart
  12. GRB980703 Transient Optical Follow-Up
  13. GRB980703: LOTIS observation at early times
  14. GRB980613 Optical Observations
  15. GRB980703 (I band observations)
  16. BeppoSAX NFI observations of GRB 980703
  17. GRB980519 observation report
  18. GRB980703 optical followup
  19. Radio observations of SGRs
  20. SGR1900+14 field optical observations
  21. GRB980613, optical observations
  22. GRB 980613: Optical transient and its host galaxy
  23. SGR1627-41, RXTE/ASM observations
  24. GRB 980613: Detection of the probable host galaxy
  25. Reduced error box of SGR 1627-41
  26. GRB 980613: BATSE Observations
  27. GRB 980613 Optical Observations
  28. GRB 980613 optical observations
  29. Discovery of a new SGR source, SGR1627-41
  30. GRB980613 Optical Observations
  31. GRB980613 observations from Palomar
  32. GRB 980613 optical/IR obs.
  33. GRB980613 Near Infra-Red Observations
  34. GRB971214 Secondary Standards
  35. GRB980519 Secondary Standards
  36. BATSE on-board GRB trigger change
  37. GRB 980519 Optical Observations
  38. GRB 980519
  39. GRB980519 optical observations
  40. GRB 980519 Optical Observations
  41. GRB980519 BATSE Observations
  42. GRB980519 Optical Observations
  43. GRB980519 Optical Observations
  44. GRB 980519 Optical Observations
  45. GRB980515, BeppoSAX IAUC to be submitted
  46. BSAX Observations of GRB980425 field
  47. IPN web site of GRBs
  48. GRB980425 BATSE observations
  49. SAX J0840.7+2248 Optical Observations
  50. GRB980425: optical obs.
  51. GRB980425: Radio Observations
  52. report on BSAX observations of GRB980425
  53. GRB 980329 ROSAT observation
  54. GRB980326 X-ray Observations
  55. GRB980326, optical observations
  56. GRB980326, optical observations
  57. GRB980329, Fading IR counterpart to radio source
  58. GRB980329 Keck K-band observations
  59. GRB980329 sub-millimeter observations
  60. GRB980329 optical observations
  61. GRB980329 near-IR observations
  62. GRB980329 near-IR observations
  63. GRB980326 optical observations
  64. GRB980329 optical observations
  65. GRB980329 VLA observations
  66. GRB980329 optical observations
  67. GRB980329 optical observations
  68. GRB980326 optical observations
  69. GRB980326 optical observations
  70. Optical Observations of GRB 970508
  71. Near-IR follow-up on GRB 971227
  72. Optical Observations of the GRB 971227 field
  73. Optical Observations on GRB 971227
  74. GRB971227: Plaskett R-band observations
  75. GRB 971227: Optical clarifications
  76. GRB971227: Further CAHA R-band images
  77. GRB971227: LOTIS observations
  78. GRB971214: Optical Observations and Calibrations
  79. GRB 971214: Optical Observations
  80. Radio Observations of GRB 971214 at the VLA
  81. GRB 971024: Refined analysis by USNOFS Observations
  82. GRB 971024: KPNO Optical Observations
  83. GRB 970828: Palomar Observations

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