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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"

32494 results found.

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

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