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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"

32490 results found.

  1. GRB 980703: BATSE Observations
  2. GRB980703 optical observations
  3. GRB980703: Radio transient
  4. GRB980703 H-band Observations
  5. GRB 980703: Spectrum of the proposed optical counterpart
  6. RXTE Observation of GRB 980706
  7. GRB980703: Spectrum of the proposed optical counterpart
  8. GRB980703 Transient Optical Follow-Up
  9. GRB980703: LOTIS observation at early times
  10. GRB980613 Optical Observations
  11. GRB 980703
  12. GRB980703 (I band observations)
  13. GRB 980703 H-band Observations
  14. GRB980703: radio source/optical transient
  15. BeppoSAX NFI observations of GRB 980703
  16. GRB980519 observation report
  17. Radio observations of SGRs
  18. GRB 980613 Near-IR observations
  19. GRB980613, optical observations
  20. GRB 980613: Optical transient and its host galaxy
  21. SGR1627-41, RXTE/ASM observations
  22. SGR1627-41, Refined IPN annulus location
  23. GRB 980613: Detection of the probable host galaxy
  24. Reduced error box of SGR 1627-41
  25. SGR1627-41, BeppoSAX-GRBM detections
  26. GRB 980613 Optical Observations
  27. GRB 980613 optical observations
  28. GRB980613 Optical Observations
  29. GRB980613 observations from Palomar
  30. GRB 980613 new optical/IR observations
  31. GRB971214 Secondary Standards
  32. GRB980519 Secondary Standards
  33. SGR1900+14
  34. GRB 980519 Optical Observations
  35. GRB980519 optical observations
  36. GRB980519 I-band observations
  37. GRB 980519
  38. GRB980519 optical observations
  39. GRB 980519 Optical Observations
  40. GRB980519 BATSE Observations
  41. GRB970519, optical follow-up at Schmidt Calern
  42. GRB980519 optical observations
  43. GRB980519 Optical Observations
  44. GRB980519 Optical Observations
  45. GRB980519 IPN POSITION
  46. GRB980519 Optical Observations
  47. GRB 980519 Optical Observations
  48. GRB980519 optical observations
  49. GRB980515, BeppoSAX IAUC to be submitted
  50. GRB980519, BeppoSAX-WFC updated position
  51. GRB 980425 Radio Light Curve
  52. GRB 980425 Brightness Temperature
  53. BSAX Observations of GRB980425 field
  54. IPN web site of GRBs
  55. GRB980425 BATSE observations
  56. SAX J0840.7+2248 Optical Observations
  57. GRB 980425 optical observations
  58. GRB980425: optical obs.
  59. GRB980425: Radio Observations
  60. GRB 980425 optical observations
  61. GRB980326, optical observations
  62. GRB980326, optical observations
  63. GRB980329, Fading IR counterpart to radio source
  64. GRByymmdd, Announcement of automation
  65. GRB980326 IPN annulus
  66. GRB980329
  67. GRB980329 Keck K-band observations
  68. GRB980329 sub-millimeter observations
  69. GRB980329 IPN annulus
  70. GRB980329 optical observations
  71. GRB980329 near-IR observations
  72. GRB980329 optical observations
  73. GRB980326 optical observations
  74. GRB980326 optical observations
  75. GRB970508 SAO RAS optical observations
  76. GRB 971214: Redshift from Keck Observations
  77. Near-IR follow-up on GRB 971227
  78. GRB971214: Keck R & I-band Observations
  79. GRB 971227: Optical Observations
  80. Optical Observations of the GRB 971227 field
  81. GRB971227: Plaskett R-band observations
  82. GRB 971227: Optical clarifications
  83. GRB971227: LOTIS observations
  84. GRB971214: Optical Observations and Calibrations
  85. Optical Observations of GRB 971214 at Keck
  86. GRB 971024: Refined analysis by USNOFS Observations
  87. GRB 971024: USNO Observations
  88. GRB 970925: BATSE Localization
  89. IRAS 18119-1342 and the possible new SGR
  90. GRB 970228: Keck/LRIS Optical Observations

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