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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"

32493 results found.

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

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