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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.

Lucene Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

19139 results found.

  1. GRB 991208 Infrared Detection
  2. GRB 991216--Summary of RXTE Observations
  3. GRB 991216 Optical Observations
  4. GRB 991216, optical observations
  5. GRB 991208 SAO-RAS Spectroscopy
  6. GRB 991216, Optical Transient
  7. GRB 991216, Optical Afterglow
  8. GRB991216 ('Beethoven Burst') B, R, and K Observations
  9. GRB991216, infrared observations
  10. GRB991216 Optical Observations
  11. GRB 991208 optical observations
  12. GRB 991208 Keck Spectroscopy
  13. GRB 991216: Extremely bright BATSE burst
  14. R-band Observations of GRB991208 at TNG
  15. GRB991208, optical observations
  16. GRB 991208 Keck Spectroscopy
  17. GRB991208 15-GHz observations
  18. GRB991208, optical observations
  19. GRB 991208 - OVRO detection
  20. GRB 991208 optical observations
  21. GRB 991208 optical observations
  22. GRB 991208: Radio Observations
  23. Optical Observations of GRB991105
  24. GRB991106: BeppoSAX/BATSE results
  25. GRB 991106, optical observations
  26. GRB991106, near-infrared observations
  27. GRB 991106, radio observations
  28. GRB 991105: BATSE Observations
  29. GRB 991106 Optical Observations
  30. GRB 991105, optical observations
  31. GRB 991106, LOTIS Optical Observations
  32. GRB 991106, optical observations
  33. GRB 991014, Optical Observations
  34. GRB 991014 - BeppoSAX NFI observations
  35. GRB 991014, Optical Observations
  36. GRB 991014, radio observations
  37. GRB991014 BATSE Observations
  38. GRB 991014, Optical Observations
  39. GRB 991014, optical observations
  40. GRB 990915 optical observations
  41. GRB 990907 optical observations
  42. Optical Observations of GRB990907
  43. GRB990907 and 990908
  44. GRB 990712 Late Optical Decay and Host Galaxy
  45. GRB 990712, Optical Observation
  46. GRB990806: BATSE Observations
  47. GRB 990806 Optical observations
  48. Optical Observations of GRB990806
  49. GRB 990806, Optical Observations
  50. GRB 990806, optical observations
  51. GRB 990806, Optical Observations
  52. GRB990806 UBVRIJHK observations
  53. GRB 990712 Optical Observations
  54. GRB 990712 Optical Decay: Indication of Bright Host Galaxy
  55. GRB 990712
  56. Late-time HST/STIS Observations of GRB 990510
  57. GRB 990705, R-band observations
  58. Infrared and Optical Observations of GRB990705
  59. GRB 990705, radio observations
  60. GRB990704 radio and optical observations
  61. GRB 990704 X-ray Observations
  62. GRB 990704 Optical Observations
  63. GRB 990704, optical observations
  64. GRB990705: Intriguing Positional Coincidences
  65. GRB990704
  66. GRB990704, optical observations
  67. Identification of a possible optical counterpart for GRB990704
  68. GRB990704
  69. Optical Observations of GRB990627
  70. GRB 990627, radio observations
  71. Late-time HST/STIS Observation of GRB 990123
  72. GRB 990506 - clarification to GCN 352
  73. GRB 990506 - Optical Observations
  74. Optical Observations of GRB 990506
  75. GRB990527 Optical Observations
  76. Late Afterglows of GRBs 990510, 990123
  77. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  78. X-ray/GRB 1SAX J0835.9+5118, Optical Observations
  79. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  80. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  81. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  82. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  83. radio observations of X-ray/GRB transient field
  84. Optical report on X-ray/GRB transient
  85. radio detection of X-ray/GRB transient
  86. BeppoSAX: A new fast X-ray transient
  87. GRB 990510: optical observations
  88. GRB990510: photometric and spectroscopic observations with the VLT
  89. GRB 990510: optical observations
  90. GRB990510, VI observations
  91. GRB 990506 R band observations
  92. GRB990510: X-ray afterglow
  93. GRB 990510: optical observation
  94. GRB 990510: Broad Band Break
  95. GRB 990510: BATSE Observations
  96. GRB 990510 Optical Observations
  97. GRB 990510, BVI photometry
  98. GRB 990510 optical observations
  99. GRB 990510: BeppoSAX/GRBM observations
  100. GRB990510 optical observations

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