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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"

21793 results found.

  1. GRB 000301c near-IR observations
  2. GRB000301C, optical observations
  3. GRB000301C, near-infrared observations (JHK' photometry)
  4. GRB000301c optical observations
  5. GRB 000301A, Radio Observations
  6. GRB000301C, optical observations
  7. GRB000301c, near-infrared observations
  8. Radio observations of the error box of GRB000301A
  9. HST Observations of GRB 990712
  10. GRB 000214 near-IR observations
  11. GRB 000115 Optical observations
  12. GRB 000214, Radio Observations
  13. GRB000210, Radio Observations
  14. Optical observations of GRB000210
  15. GRB 000210: BATSE Observations
  16. Optical observations of the Chandra X-ray source for GRB000210
  17. GRB000210, Radio Observations
  18. Optical candidate for GRB000210
  19. Chandra Observations of GRB000210 X-ray Afterglow
  20. GRB000201, Radio Observations
  21. Optical observations of GRB000131
  22. GRB000201 Optical Observations
  23. GRB 000201: TAROT optical observations
  24. GRB 000131 Optical Observations
  25. GRB000126 Optical Observations
  26. GRB 991208, radio observations
  27. GRB 000126, optical observations
  28. GRB000126, optical observations
  29. GRB 000115 Optical observations
  30. BATSE Observations of GRB000115
  31. GRB991216, UBVRIJHK field photometry
  32. GRB991216 late optical observation
  33. GRB 991216 VLBA Observations
  34. IPN error boxes for GRB991229
  35. GRB 991216: J band spectrophotometry
  36. GRB 991216: Detection of the Host and/or Absorber Galaxy
  37. GRB 991216 RXTE ASM Observations
  38. Lowell/Perkins observation of GRB 991216
  39. GRB 991217 (SAX J2303.2+0015) Optical observations
  40. GRB991217/SAX J2303.2+0015, optical observations
  41. GRB 991216, optical observations
  42. GRB 991216 Optical Observations
  43. GRB 991216 Optical spectroscopy/imaging
  44. GRB991216 Optical and IR observations
  45. K observations of GRB991216
  46. SAX J2303.2+0015 Optical observations
  47. IR observations of GRB991216
  48. GRB991216 radio observations
  49. GRB 991217 (SAX J2303.2+0015) Optical observations
  50. GRB991216 radio observations
  51. GRB991216, optical observations
  52. GRB991216 Optical and infrared observations of Beethoven Burst
  53. GRB 991216 Radio Observations
  54. GRB 991208 Keck Spectroscopy
  55. GRB 991208 Infrared Detection
  56. GRB 991216--Summary of RXTE Observations
  57. GRB 991216 Optical Observations
  58. GRB 991216, optical observations
  59. GRB 991208 SAO-RAS Spectroscopy
  60. GRB 991216, Optical Transient
  61. GRB 991216, Optical Afterglow
  62. GRB991216 ('Beethoven Burst') B, R, and K Observations
  63. GRB991216, infrared observations
  64. GRB991216 Optical Observations
  65. GRB 991208 optical observations
  66. GRB 991208 Keck Spectroscopy
  67. GRB 991216: Extremely bright BATSE burst
  68. R-band Observations of GRB991208 at TNG
  69. GRB991208, optical observations
  70. GRB 991208 Keck Spectroscopy
  71. GRB991208 15-GHz observations
  72. GRB991208, optical observations
  73. GRB 991208 - OVRO detection
  74. GRB 991208 optical observations
  75. GRB 991208 optical observations
  76. GRB 991208: Radio Observations
  77. Optical Observations of GRB991105
  78. GRB991106: BeppoSAX/BATSE results
  79. GRB 991106, optical observations
  80. GRB991106, near-infrared observations
  81. GRB 991106, radio observations
  82. GRB 991105: BATSE Observations
  83. GRB 991106 Optical Observations
  84. GRB 991105, optical observations
  85. GRB 991106, LOTIS Optical Observations
  86. GRB 991106, optical observations
  87. GRB 991014, Optical Observations
  88. GRB 991014 - BeppoSAX NFI observations
  89. GRB 991014, Optical Observations
  90. GRB 991014, radio observations
  91. GRB991014 BATSE Observations
  92. GRB 991014, Optical Observations
  93. GRB 991014, optical observations
  94. GRB 990915 optical observations
  95. GRB 990907 optical observations
  96. Optical Observations of GRB990907
  97. GRB990907 and 990908
  98. GRB 990712 Late Optical Decay and Host Galaxy
  99. GRB 990712, Optical Observation
  100. GRB990806: BATSE Observations

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