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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"
  1. IPN annulus for GRB000115
  2. Second RXTE Observation of GRB 000115
  3. GRB991216, UBVRIJHK field photometry
  4. GRB991216 late optical observation
  5. Single IPN error box for GRB991229
  6. GCN resumes full operations
  7. GRB 991216 VLBA Observations
  8. BEPPOSAX GRBM Localization of GRB991226
  9. IPN error boxes for GRB991229
  10. GRB 991216: J band spectrophotometry
  11. GRB 991216: Detection of the Host and/or Absorber Galaxy
  12. IPN localization of GRB991226
  13. Single IPN error box for GRB991221
  14. IPN error boxes for GRB991221
  15. GRB 991216 RXTE ASM Observations
  16. IPN error box for GRB991216
  17. GRB 991216: Updated BATSE parameters
  18. Lowell/Perkins observation of GRB 991216
  19. GRB 991217 (SAX J2303.2+0015) Optical observations
  20. GRB991217/SAX J2303.2+0015, optical observations
  21. Chandra observation of the X-ray afterglow of GRB991216
  22. GRB 991216, optical observations
  23. GRB 991216 Optical Observations
  24. GRB 991216 Optical spectroscopy/imaging
  25. VLT spectra of GRB991216
  26. GRB991216 Optical and IR observations
  27. K observations of GRB991216
  28. SAX J2303.2+0015 Optical observations
  29. IR observations of GRB991216
  30. GRB991216 radio observations
  31. GRB 991217 (SAX J2303.2+0015) Optical observations
  32. GRB991216 radio observations
  33. GRB991216 Spectroscopy
  34. Lowell/Perkins observation of GRB 991216
  35. GRB991216, optical observations
  36. GRB991216 Optical and infrared observations of Beethoven Burst
  37. Refined IPN localization of GRB991216
  38. GRB 991216 Radio Observations
  39. GRB 991217
  40. GRB 991208 Keck Spectroscopy
  41. GRB 991208 Infrared Detection
  42. GRB991216
  43. GRB 991216--Summary of RXTE Observations
  44. GRB 991216 Optical Observations
  45. GRB 991216, optical observations
  46. GRB 991208 SAO-RAS Spectroscopy
  47. SAX J2303.2+0015: an x-ray/GRB?
  48. GRB 991216, Optical Transient
  49. GRB 991216, Optical Afterglow
  50. GRB991216 ('Beethoven Burst') B, R, and K Observations
  51. GRB 991216: Comparison with DPOSS images
  52. GRB991216, infrared observations
  53. GRB991216 Optical Observations
  54. GRB 991208 optical observations
  55. Lowell/Perkins observation of GRB 991216
  56. GRB 991216 Optical Observation
  57. GRB 991208 Keck Spectroscopy
  58. GRB 991216: Extremely bright BATSE burst
  59. R-band Observations of GRB991208 at TNG
  60. GRB991208, optical observations
  61. GRB 991208 Keck Spectroscopy
  62. GRB991208 - millimeter detection
  63. GRB 991208, Optical Observation
  64. GRB991208 15-GHz observations
  65. GRB991208, optical observations
  66. GRB 991208 - OVRO detection
  67. GRB 991208 Optical Decay
  68. GRB 991208 optical observations
  69. GRB 991208 optical observations
  70. GRB 991208: Radio Observations
  71. IPN localization of GRB991208
  72. Optical Observations of GRB991105
  73. GRB991106: BeppoSAX/BATSE results
  74. GRB 991106, optical observations
  75. GRB991106, near-infrared observations
  76. BeppoSAX NFI Observation of GRB991106
  77. GRB 991106, radio observations
  78. GRB991106: the first BeppoSAX short GRB detection?
  79. GRB 991105: BATSE Observations
  80. IPN localization of GRB991105
  81. GRB 991106 Optical Observations
  82. GRB 991105, optical observations
  83. GRB991106, optical observation at SAO-RAS
  84. GRB 991106, LOTIS Optical Observations
  85. GRB 991106, optical observations
  86. BeppoSAX refined position for GRB991106
  87. BeppoSAX GRB Alert: GRB991106
  88. Revised BeppoSAX WFC position of GRB991105
  89. GRB991105: SAX-GRBM/-WFC detection
  90. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  91. GRB ALERT: GRB991105
  92. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  93. GRB 991014, Optical Observations
  94. GRB 991014 - BeppoSAX NFI observations
  95. GRB 991014, Optical Observations
  96. GRB 991014, radio observations
  97. GRB991014 BATSE Observations
  98. GRB 991014, Optical Observations
  99. GRB 991014, optical observations
  100. Super-LOTIS optical observation of GRB991014

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