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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

32555 results found.

  1. GRB 991217 (SAX J2303.2+0015) Optical observations
  2. GRB991216 radio observations
  3. Lowell/Perkins observation of GRB 991216
  4. GRB991216, optical observations
  5. Refined IPN localization of GRB991216
  6. GRB 991216 Radio Observations
  7. GRB 991208 Keck Spectroscopy
  8. GRB 991208 Infrared Detection
  9. GRB991216
  10. GRB 991216--Summary of RXTE Observations
  11. GRB 991216 Optical Observations
  12. GRB 991216, optical observations
  13. GRB 991208 SAO-RAS Spectroscopy
  14. GRB 991216, Optical Transient
  15. GRB 991216, Optical Afterglow
  16. GRB991216 ('Beethoven Burst') B, R, and K Observations
  17. GRB 991216: Comparison with DPOSS images
  18. GRB 991208 optical observations
  19. Lowell/Perkins observation of GRB 991216
  20. GRB 991216 Optical Observation
  21. GRB 991208 Keck Spectroscopy
  22. R-band Observations of GRB991208 at TNG
  23. GRB991208, optical observations
  24. GRB 991208 Keck Spectroscopy
  25. GRB991208 - millimeter detection
  26. GRB 991208, Optical Observation
  27. GRB991208 15-GHz observations
  28. GRB991208, optical observations
  29. GRB 991208 - OVRO detection
  30. GRB 991208 Optical Decay
  31. GRB 991208 optical observations
  32. GRB 991208 optical observations
  33. GRB 991208: Radio Observations
  34. Optical Observations of GRB991105
  35. GRB991106: BeppoSAX/BATSE results
  36. GRB 991106, optical observations
  37. GRB991106, near-infrared observations
  38. BeppoSAX NFI Observation of GRB991106
  39. GRB 991106, radio observations
  40. GRB 991105: BATSE Observations
  41. IPN localization of GRB991105
  42. GRB 991106 Optical Observations
  43. GRB 991105, optical observations
  44. GRB991106, optical observation at SAO-RAS
  45. GRB 991106, LOTIS Optical Observations
  46. GRB 991106, optical observations
  47. Revised BeppoSAX WFC position of GRB991105
  48. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  49. GRB 991014, Optical Observations
  50. GRB 991014 - BeppoSAX NFI observations
  51. GRB 991014, Optical Observations
  52. GRB 991014, Optical Observations
  53. GRB 991014, optical observations
  54. Super-LOTIS optical observation of GRB991014
  55. IPN/NFI error box for GRB991014
  56. IPN localization of GRB991014 - CORRECTION
  57. IPN localization of GRB991014
  58. GRB 990915 optical observations
  59. GRB 990907 optical observations
  60. Optical Observations of GRB990907
  61. IPN error box for GRB990915 (=BATSE 7766)
  62. IPN localization of BATSE #7766 (GRB990915)
  63. GRB990907: BeppoSAX follow up and X-ray afterglow
  64. GRB990907 and 990908
  65. IPN localization of GRB990907
  66. GRB 990712 Late Optical Decay and Host Galaxy
  67. GRB 990712, Optical Observation
  68. GRB990806 BeppoSAX follow up
  69. GRB990806: BATSE Observations
  70. GRB 990806 Optical observations
  71. Optical Observations of GRB990806
  72. GRB 990806, Optical Observations
  73. GRB 990806, optical observations
  74. GRB 990806, Optical Observations
  75. GRB990806 UBVRIJHK observations
  76. GRB 990712 Optical Decay: Indication of Bright Host Galaxy
  77. VLT spectrum of GRB990712
  78. GRB 990712
  79. Late-time HST/STIS Observations of GRB 990510
  80. BeppoSAX NFI Observation of GRB990705
  81. BeppoSAX NFI Observation of GRB990705
  82. Updated Astrometry for the IR Counterpart of GRB990705
  83. GRB 990705, R-band observations
  84. Updated IPN localization of GRB990705
  85. IPN localization of GRB990704
  86. IPN localization of GRB990705
  87. Infrared and Optical Observations of GRB990705
  88. GRB 990705, radio observations
  89. GRB990704: SAX-NFI results summary
  90. GRB990704 radio and optical observations
  91. GRB 990704 X-ray Observations
  92. GRB 990704 Optical Observations
  93. GRB 990704, optical observations
  94. GRB990704
  95. GRB990704
  96. Refined BeppoSAX-WFC position of GRB990704: Errata Corrige
  97. GRB990704, optical observations
  98. GRB990704: possible X-ray afterglow
  99. Identification of a possible optical counterpart for GRB990704
  100. GRB990704

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