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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"

20558 results found.

  1. Possible identification of SN1999E with GRB980910
  2. Optical Observations of GRB 981220
  3. GRB 981226: radio variable
  4. GRB981220
  5. GRB981220, Correction to GCN 179
  6. GRB981220, Optical Observations
  7. GRB 981220 Optical observations
  8. GRB 981226 Optical Observations
  9. GRB 980613: Spectroscopy of the host galaxy
  10. GRB981226, sub-millimeter observations
  11. GRB981220, sub-millimeter observations
  12. GRB 981220 and GRB 981226, optical observations
  13. GRB981226 Optical Observations
  14. GRB 981226 radio observations
  15. GRB 981226
  16. GRB 981226 optical observations
  17. radio observations of GRB 981226
  18. GRB981220 B, R and I band observations
  19. Optical Observations of GRB981226
  20. GRB 981220:Optical Observations
  21. GRB 981220 optical R and I observations
  22. GRB981226, BeppoSAX Christmas GRB
  23. GRB 981226 - Infrared Observations
  24. GRB 981226 optical observations
  25. GRB 981220
  26. GRB 981220, radio observations
  27. GRB 981220, radio observations
  28. GRB981220 I-band Observations
  29. GRB981220 Optical Observations
  30. GRB 981220
  31. GRB 981220 Optical Observations
  32. GRB 981220, optical observations
  33. GRB 980326/Host Galaxy
  34. GRB980329 R,I flux calibration and R,I,K upper limits
  35. GRB980425 Optical Follow-up
  36. GRB980425: X-ray revised positions
  37. GRB 980923 BATSE Observations
  38. SGR1900+14, BeppoSAX-GRBM observations
  39. GRB980703 Very Long Baseline Interferometry
  40. GRB970508 optical observations
  41. GRB971214, association with a Galactic star?
  42. Optical Observations of the Host Galaxy of GRB 980519
  43. GRB980519, Optical Observations
  44. GRB980703, Host galaxy multicolor photometry
  45. GRB 980703 (NFI observations)
  46. GRB980703 optical photometry
  47. GRB 980703: BATSE Observations
  48. GRB980703 optical observations
  49. GRB980703: Radio transient
  50. GRB980703 H-band Observations
  51. GRB 980703: Spectrum of the proposed optical counterpart
  52. GRB980703: Spectrum of the proposed optical counterpart
  53. GRB980613 Optical Observations
  54. GRB980703 (I band observations)
  55. GRB 980703 H-band Observations
  56. GRB980703 (optical R observations)
  57. GRB980703: radio source/optical transient
  58. BeppoSAX NFI observations of GRB 980703
  59. Radio observations of SGRs
  60. SGR1900+14 field optical observations
  61. GRB 980613 Near-IR observations
  62. GRB980613, optical observations
  63. GRB 980613: Optical transient and its host galaxy
  64. SGR1627-41, RXTE/ASM observations
  65. GRB 980613: Detection of the probable host galaxy
  66. Reduced error box of SGR 1627-41
  67. GRB 980613: BATSE Observations
  68. GRB 980613 Optical Observations
  69. GRB 980613 optical observations
  70. Discovery of a new SGR source, SGR1627-41
  71. GRB980613 Optical Observations
  72. GRB980613 observations from Palomar
  73. GRB 980613 new optical/IR observations
  74. GRB 980613 optical/IR obs.
  75. GRB980613 Near Infra-Red Observations
  76. GRB971214 Secondary Standards
  77. SGR 1900+14
  78. GRB980519 Secondary Standards
  79. SGR1900+14
  80. SGR1900+14
  81. GRB 980519 Optical Observations
  82. GRB980519 optical observations
  83. GRB980519 I-band observations
  84. GRB 980519
  85. GRB980519 optical observations
  86. GRB 980519 Optical Observations
  87. GRB980519 BATSE Observations
  88. GRB980519 optical observations
  89. GRB980519 Optical Observations
  90. GRB980519 Optical Observations
  91. GRB980519 Optical Observations
  92. GRB 980519 Optical Observations
  93. GRB980519 optical observations
  94. GRB 980425 Brightness Temperature
  95. BSAX Observations of GRB980425 field
  96. GRB980425 BATSE observations
  97. SAX J0840.7+2248 Optical Observations
  98. GRB 980425 optical observations
  99. GRB980425: optical obs.
  100. GRB980425: Radio Observations

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