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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"

31744 results found.

  1. GRB 990123: Possible Gravitationally Lensed Burst?
  2. GRB990123, optical observation
  3. GRB 990123 optical observations
  4. GRB 990123: Pre-Burst Detection of an Apparent Host Galaxy
  5. GRB 990123 radio observations
  6. GRB 990123, new radio source
  7. GRB990123, Optical observation
  8. GRB 990123: Optical Decay Slope
  9. GRB 990123 r-band photometry
  10. GRB 990123 Optical Follow-up
  11. GRB990123, early optical counterpart detection
  12. GRB990123 Optical Observation
  13. GRB 990123: Bright New Source, Possible Optical Transient
  14. GRB 990123, Radio observations
  15. SN 1999E & GRB 980919
  16. Optical Observations of GRB 981220
  17. GRB 981226: radio variable
  18. GRB981220
  19. GRB981220, Correction to GCN 179
  20. GRB981220, Optical Observations
  21. GRB 981220 Optical observations
  22. GRB 981226 Optical Observations
  23. GRB 980613: Spectroscopy of the host galaxy
  24. GRB981226, sub-millimeter observations
  25. GRB981220, sub-millimeter observations
  26. GRB 981220 and GRB 981226, optical observations
  27. GRB981226 Optical Observations
  28. GRB 981226 radio observations
  29. GRB 981226
  30. radio observations of GRB 981226
  31. GRB981220 B, R and I band observations
  32. Optical Observations of GRB981226
  33. GRB 981220:Optical Observations
  34. GRB 981220 optical R and I observations
  35. GRB981226, BeppoSAX Christmas GRB
  36. GRB 981226 - Infrared Observations
  37. GRB 981220
  38. GRB 981220, radio observations
  39. GRB 981220, radio observations
  40. GRB 981220: BeppoSAX/GRBM results
  41. GRB981220 I-band Observations
  42. GRB 981220
  43. GRB 981220 Optical Observations
  44. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  45. BeppoSAX NFI Observation of GRB980425
  46. GRB980425 Optical Follow-up
  47. GRB980425: X-ray revised positions
  48. GRB980703 Very Long Baseline Interferometry
  49. GRB970508 optical observations
  50. Optical Observations of the Host Galaxy of GRB 980519
  51. GRB980519, Optical Observations
  52. GRB980703, Host galaxy multicolor photometry
  53. GRB 980703 (NFI observations)
  54. GRB980703 optical photometry
  55. GRB 980703: BATSE Observations
  56. GRB980703 optical observations
  57. GRB980703: Radio transient
  58. GRB980703 H-band Observations
  59. GRB 980703: Spectrum of the proposed optical counterpart
  60. RXTE Observation of GRB 980706
  61. GRB980703: Spectrum of the proposed optical counterpart
  62. GRB980703 Transient Optical Follow-Up
  63. GRB980703: LOTIS observation at early times
  64. GRB980613 Optical Observations
  65. GRB 980703
  66. GRB980703 (I band observations)
  67. GRB 980703 H-band Observations
  68. GRB980703: radio source/optical transient
  69. BeppoSAX NFI observations of GRB 980703
  70. GRB980519 observation report
  71. Radio observations of SGRs
  72. GRB 980613 Near-IR observations
  73. GRB980613, optical observations
  74. GRB 980613: Optical transient and its host galaxy
  75. SGR1627-41, RXTE/ASM observations
  76. SGR1627-41, Refined IPN annulus location
  77. GRB 980613: Detection of the probable host galaxy
  78. Reduced error box of SGR 1627-41
  79. SGR1627-41, BeppoSAX-GRBM detections
  80. GRB 980613 Optical Observations
  81. GRB 980613 optical observations
  82. GRB980613 Optical Observations
  83. GRB980613 observations from Palomar
  84. GRB 980613 new optical/IR observations
  85. GRB971214 Secondary Standards
  86. GRB980519 Secondary Standards
  87. SGR1900+14
  88. GRB 980519 Optical Observations
  89. GRB980519 optical observations
  90. GRB980519 I-band observations
  91. GRB 980519
  92. GRB980519 optical observations
  93. GRB 980519 Optical Observations
  94. GRB980519 BATSE Observations
  95. GRB970519, optical follow-up at Schmidt Calern
  96. GRB980519 optical observations
  97. GRB980519 Optical Observations
  98. GRB980519 Optical Observations
  99. GRB980519 IPN POSITION
  100. GRB980519 Optical Observations

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