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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"

32489 results found.

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

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