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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"

32509 results found.

  1. GRB 981226 - Infrared Observations
  2. GRB 981220
  3. GRB 981220, radio observations
  4. GRB 981220, radio observations
  5. GRB 981220: BeppoSAX/GRBM results
  6. GRB981220 I-band Observations
  7. GRB 981220
  8. GRB 981220 Optical Observations
  9. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  10. BeppoSAX NFI Observation of GRB980425
  11. GRB980425 Optical Follow-up
  12. GRB980425: X-ray revised positions
  13. GRB980703 Very Long Baseline Interferometry
  14. GRB970508 optical observations
  15. Optical Observations of the Host Galaxy of GRB 980519
  16. GRB980519, Optical Observations
  17. GRB980703, Host galaxy multicolor photometry
  18. GRB 980703 (NFI observations)
  19. GRB980703 optical photometry
  20. GRB 980703: BATSE Observations
  21. GRB980703 optical observations
  22. GRB980703: Radio transient
  23. GRB980703 H-band Observations
  24. GRB 980703: Spectrum of the proposed optical counterpart
  25. RXTE Observation of GRB 980706
  26. GRB980703: Spectrum of the proposed optical counterpart
  27. GRB980703 Transient Optical Follow-Up
  28. GRB980703: LOTIS observation at early times
  29. GRB980613 Optical Observations
  30. GRB 980703
  31. GRB980703 (I band observations)
  32. GRB 980703 H-band Observations
  33. GRB980703: radio source/optical transient
  34. BeppoSAX NFI observations of GRB 980703
  35. GRB980519 observation report
  36. Radio observations of SGRs
  37. GRB 980613 Near-IR observations
  38. GRB980613, optical observations
  39. GRB 980613: Optical transient and its host galaxy
  40. SGR1627-41, RXTE/ASM observations
  41. SGR1627-41, Refined IPN annulus location
  42. GRB 980613: Detection of the probable host galaxy
  43. Reduced error box of SGR 1627-41
  44. SGR1627-41, BeppoSAX-GRBM detections
  45. GRB 980613 Optical Observations
  46. GRB 980613 optical observations
  47. GRB980613 Optical Observations
  48. GRB980613 observations from Palomar
  49. GRB 980613 new optical/IR observations
  50. GRB971214 Secondary Standards
  51. GRB980519 Secondary Standards
  52. SGR1900+14
  53. GRB 980519 Optical Observations
  54. GRB980519 optical observations
  55. GRB980519 I-band observations
  56. GRB 980519
  57. GRB980519 optical observations
  58. GRB 980519 Optical Observations
  59. GRB980519 BATSE Observations
  60. GRB970519, optical follow-up at Schmidt Calern
  61. GRB980519 optical observations
  62. GRB980519 Optical Observations
  63. GRB980519 Optical Observations
  64. GRB980519 IPN POSITION
  65. GRB980519 Optical Observations
  66. GRB 980519 Optical Observations
  67. GRB980519 optical observations
  68. GRB980515, BeppoSAX IAUC to be submitted
  69. GRB980519, BeppoSAX-WFC updated position
  70. GRB 980425 Radio Light Curve
  71. GRB 980425 Brightness Temperature
  72. BSAX Observations of GRB980425 field
  73. IPN web site of GRBs
  74. GRB980425 BATSE observations
  75. SAX J0840.7+2248 Optical Observations
  76. GRB 980425 optical observations
  77. GRB980425: optical obs.
  78. GRB980425: Radio Observations
  79. GRB 980425 optical observations
  80. GRB980326, optical observations
  81. GRB980326, optical observations
  82. GRB980329, Fading IR counterpart to radio source
  83. GRByymmdd, Announcement of automation
  84. GRB980326 IPN annulus
  85. GRB980329
  86. GRB980329 Keck K-band observations
  87. GRB980329 sub-millimeter observations
  88. GRB980329 IPN annulus
  89. GRB980329 optical observations
  90. GRB980329 near-IR observations
  91. GRB980329 optical observations
  92. GRB980326 optical observations
  93. GRB980326 optical observations
  94. GRB970508 SAO RAS optical observations
  95. GRB 971214: Redshift from Keck Observations
  96. Near-IR follow-up on GRB 971227
  97. GRB971214: Keck R & I-band Observations
  98. GRB 971227: Optical Observations
  99. Optical Observations of the GRB 971227 field
  100. GRB971227: Plaskett R-band observations

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