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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"

21319 results found.

  1. GRB970508 optical observations
  2. GRB971214, association with a Galactic star?
  3. Optical Observations of the Host Galaxy of GRB 980519
  4. GRB980519, Optical Observations
  5. GRB980703, Host galaxy multicolor photometry
  6. GRB 980703 (NFI observations)
  7. GRB980703 optical photometry
  8. GRB 980703: BATSE Observations
  9. GRB980703 optical observations
  10. GRB980703: Radio transient
  11. GRB980703 H-band Observations
  12. GRB 980703: Spectrum of the proposed optical counterpart
  13. GRB980703: Spectrum of the proposed optical counterpart
  14. GRB980613 Optical Observations
  15. GRB980703 (I band observations)
  16. GRB 980703 H-band Observations
  17. GRB980703 (optical R observations)
  18. GRB980703: radio source/optical transient
  19. BeppoSAX NFI observations of GRB 980703
  20. Radio observations of SGRs
  21. SGR1900+14 field optical observations
  22. GRB 980613 Near-IR observations
  23. GRB980613, optical observations
  24. GRB 980613: Optical transient and its host galaxy
  25. SGR1627-41, RXTE/ASM observations
  26. GRB 980613: Detection of the probable host galaxy
  27. Reduced error box of SGR 1627-41
  28. GRB 980613: BATSE Observations
  29. GRB 980613 Optical Observations
  30. GRB 980613 optical observations
  31. Discovery of a new SGR source, SGR1627-41
  32. GRB980613 Optical Observations
  33. GRB980613 observations from Palomar
  34. GRB 980613 new optical/IR observations
  35. GRB 980613 optical/IR obs.
  36. GRB980613 Near Infra-Red Observations
  37. GRB971214 Secondary Standards
  38. SGR 1900+14
  39. GRB980519 Secondary Standards
  40. SGR1900+14
  41. SGR1900+14
  42. GRB 980519 Optical Observations
  43. GRB980519 optical observations
  44. GRB980519 I-band observations
  45. GRB 980519
  46. GRB980519 optical observations
  47. GRB 980519 Optical Observations
  48. GRB980519 BATSE Observations
  49. GRB980519 optical observations
  50. GRB980519 Optical Observations
  51. GRB980519 Optical Observations
  52. GRB980519 Optical Observations
  53. GRB 980519 Optical Observations
  54. GRB980519 optical observations
  55. GRB 980425 Brightness Temperature
  56. BSAX Observations of GRB980425 field
  57. GRB980425 BATSE observations
  58. SAX J0840.7+2248 Optical Observations
  59. GRB 980425 optical observations
  60. GRB980425: optical obs.
  61. GRB980425: Radio Observations
  62. GRB 980425 optical observations
  63. report on BSAX observations of GRB980425
  64. GRB 980425 optical observations
  65. GRB980326 X-ray Observations
  66. GRB980326, optical observations
  67. GRB980326, optical observations
  68. GRB980329, Fading IR counterpart to radio source
  69. GRB980329
  70. GRB980329 Keck K-band observations
  71. GRB980329 sub-millimeter observations
  72. GRB980329 optical observations
  73. GRB980329 near-IR observations
  74. GRB980329 near-IR observations
  75. GRB980329 optical observations
  76. GRB980329 infrared observations
  77. GRB980329 optical observations
  78. GRB980326 optical observations
  79. GRB980329 optical observations
  80. GRB980329 VLA observations
  81. GRB980329 near IR observations
  82. GRB980329 optical observations
  83. GRB980329 optical observations
  84. GRB980329 optical observations
  85. GRB980326 optical observations
  86. GRB980326 optical observations
  87. GRB980326 optical observations
  88. GRB980326 optical observations
  89. GRB970508 SAO RAS optical observations
  90. Optical Observations of GRB 970508
  91. GRB 971214: Redshift from Keck Observations
  92. GRB971214: Keck R & I-band Observations
  93. GRB 971227: Optical Observations
  94. Optical Observations of the GRB 971227 field
  95. Optical Observations on GRB 971227
  96. GRB971227: Plaskett R-band observations
  97. Optical Observations for GRB 971227
  98. GRB971227: Further CAHA R-band images
  99. GRB971227: LOTIS observations
  100. GRB 971227: CAHA R-band images

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