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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"

31730 results found.

  1. SN 1999E & GRB 980919
  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. radio observations of GRB 981226
  17. GRB981220 B, R and I band observations
  18. Optical Observations of GRB981226
  19. GRB 981220:Optical Observations
  20. GRB 981220 optical R and I observations
  21. GRB981226, BeppoSAX Christmas GRB
  22. GRB 981226 - Infrared Observations
  23. GRB 981220
  24. GRB 981220, radio observations
  25. GRB 981220, radio observations
  26. GRB 981220: BeppoSAX/GRBM results
  27. GRB981220 I-band Observations
  28. GRB 981220
  29. GRB 981220 Optical Observations
  30. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  31. BeppoSAX NFI Observation of GRB980425
  32. GRB980425 Optical Follow-up
  33. GRB980425: X-ray revised positions
  34. GRB980703 Very Long Baseline Interferometry
  35. GRB970508 optical observations
  36. Optical Observations of the Host Galaxy of GRB 980519
  37. GRB980519, Optical Observations
  38. GRB980703, Host galaxy multicolor photometry
  39. GRB 980703 (NFI observations)
  40. GRB980703 optical photometry
  41. GRB 980703: BATSE Observations
  42. GRB980703 optical observations
  43. GRB980703: Radio transient
  44. GRB980703 H-band Observations
  45. GRB 980703: Spectrum of the proposed optical counterpart
  46. RXTE Observation of GRB 980706
  47. GRB980703: Spectrum of the proposed optical counterpart
  48. GRB980703 Transient Optical Follow-Up
  49. GRB980703: LOTIS observation at early times
  50. GRB980613 Optical Observations
  51. GRB 980703
  52. GRB980703 (I band observations)
  53. GRB 980703 H-band Observations
  54. GRB980703: radio source/optical transient
  55. BeppoSAX NFI observations of GRB 980703
  56. GRB980519 observation report
  57. Radio observations of SGRs
  58. GRB 980613 Near-IR observations
  59. GRB980613, optical observations
  60. GRB 980613: Optical transient and its host galaxy
  61. SGR1627-41, RXTE/ASM observations
  62. SGR1627-41, Refined IPN annulus location
  63. GRB 980613: Detection of the probable host galaxy
  64. Reduced error box of SGR 1627-41
  65. SGR1627-41, BeppoSAX-GRBM detections
  66. GRB 980613 Optical Observations
  67. GRB 980613 optical observations
  68. GRB980613 Optical Observations
  69. GRB980613 observations from Palomar
  70. GRB 980613 new optical/IR observations
  71. GRB971214 Secondary Standards
  72. GRB980519 Secondary Standards
  73. SGR1900+14
  74. GRB 980519 Optical Observations
  75. GRB980519 optical observations
  76. GRB980519 I-band observations
  77. GRB 980519
  78. GRB980519 optical observations
  79. GRB 980519 Optical Observations
  80. GRB980519 BATSE Observations
  81. GRB970519, optical follow-up at Schmidt Calern
  82. GRB980519 optical observations
  83. GRB980519 Optical Observations
  84. GRB980519 Optical Observations
  85. GRB980519 IPN POSITION
  86. GRB980519 Optical Observations
  87. GRB 980519 Optical Observations
  88. GRB980519 optical observations
  89. GRB980515, BeppoSAX IAUC to be submitted
  90. GRB980519, BeppoSAX-WFC updated position
  91. GRB 980425 Radio Light Curve
  92. GRB 980425 Brightness Temperature
  93. BSAX Observations of GRB980425 field
  94. IPN web site of GRBs
  95. GRB980425 BATSE observations
  96. SAX J0840.7+2248 Optical Observations
  97. GRB 980425 optical observations
  98. GRB980425: optical obs.
  99. GRB980425: Radio Observations
  100. GRB 980425 optical observations

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