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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"

30491 results found.

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

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