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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"

32722 results found.

  1. GRB 100316A: Swift-XRT refined analysis
  2. GRB 100316A: Swift-BAT refined analysis
  3. GRB 100316B: Swift-BAT refined analysis
  4. GRB100316A: Swift/UVOT Upper Limits
  5. GRB 100316C: BOOTES-3 observations
  6. GRB 100316B: VLT/X-shooter redshift
  7. GRB 100316B: Skynet/PROMPT Observations of Fading
  8. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  9. GRB 100316 optical candidate from 1.23m CAHA telescope
  10. GRB 100316 optical candidate from 1.23m CAHA telescope
  11. GRB 100316A: Swift/UVOT Observations
  12. GRB 100305A: Super-LOTIS early observations
  13. GRB100302A : LOAO observations and Lulin afterglow analysis
  14. GRB 100305A, Swift-BAT refined analysis
  15. GRB 100305A: Gemini z'-band observation
  16. GRB 100305A: Swift/UVOT Upper Limits
  17. GRB 100305A: Swift-XRT refined analysis
  18. GRB 100305A Optical Observations
  19. GRB 100305A: Gemini-N OT candidate
  20. GRB 100305A: PAIRITEL NIR Upper Limits
  21. GRB 100305A: P60 Observations
  22. GRB 100302A: Ondrejov 65cm limit
  23. GRB 100302A: Swift/UVOT Upper Limits
  24. GRB 100302A: Swift-XRT refined analysis
  25. GRB 100302A: Gemini-North redshift
  26. GRB 100302A: Gemini-N OT confirmation
  27. GRB 100302A: Optical observations at Crni Vrh
  28. GRB 100302A: MASTER-Net optical alert observations
  29. GRB 100302A, Swift-BAT refined analysis
  30. GRB 1000302A : A possible afterglow candidate
  31. GRB 100302A: Skynet/DAO Observations
  32. GRB 100224B: Fermi GBM detection
  33. GRB 100206A: optical observations in CrAO
  34. GRB 100206A: optical observations in Terskol
  35. GRB 100213B: Mondy optical observations
  36. GRB 100219A: optical observations
  37. GRB 100219A: GAO 150cm telescope Optical Observation
  38. Swift Triggers 413744 and 413745 are not GRBs
  39. GRB
  40. GRB 100219A: X-shooter refined analysis
  41. GRB 100219A: XRT refined analysis
  42. GRB 100219A - Gemini South Spectroscopy
  43. GRB 100216A: Swift/UVOT Observations
  44. GRB 100219A: VLT/X-shooter redshift
  45. GRB100219A Akeno and Okayama MITSuME Optical Observation
  46. GRB 100219A: GROND observations
  47. GRB 100219A: NOT OA observations
  48. GRB 100219A: Swift/UVOT Detection of the Optical Afterglow
  49. GRB 100216A: XRT Refined Analysis
  50. GRB 100219A: Swift-BAT refined analysis
  51. GRB 100219A: Pre-explosion imaging and host candidate
  52. GRB 100219A: Swift/UVOT Detection of a Source near the XRT Position
  53. GRB 100216A: Keck imaging
  54. GRB 100213A: Swift-BAT lag analysis indicates probably SHB
  55. GRB 100213B: GRT Optical Observation
  56. GRB 100213A: GRT Optical Observation
  57. GRB 100213A: Swift-BAT refined analysis
  58. GRB 100213B: Enhanced Swift-XRT position
  59. GRB 100213B: Gemini-N Observations
  60. GRB 100213B: Swift/UVOT Upper Limits
  61. GRB 100213A: Swift/UVOT Upper Limits
  62. GRB 100213B: PAIRITEL NIR Upper Limits
  63. GRB 100213B: Swift-BAT refined analysis
  64. GRB 100213B: Swift XRT refined analysis
  65. GRB 100213A: SARA observations
  66. GRB 100213A: Swift XRT refined analysis
  67. GRB 100213B: NOT optical observations
  68. GRB 100206A: Second epoch Gemini-north observations and afterglow limits
  69. Swift/UVOT observations of GRB100212A - correction of the name of the burst
  70. Swift/UVOT observations of GRB120212A
  71. GRB 100212A: LOAO R-band Detection/V-band Observation
  72. GRB 100212A: Fermi GBM detection
  73. GRB 100212A: Swift XRT refined analysis
  74. GRB 100212A: Swift-BAT refined analysis
  75. GRB 100212A: candidate optical afterglow
  76. GRB 091127: Detection of a Supernova
  77. GRB 100205A: Keck limits on an underlying host galaxy
  78. GRB 100205A: BOAO/LOAO zYJK observation
  79. GRB 100206A: GROND upper limits
  80. GRB 100206A: Gemini-North observations
  81. GRB 100206A: Swift/UVOT Upper Limits
  82. GRB 100131A: MASTER-Net optical alert observations
  83. GRB 100206A: YNAO-GMG observations
  84. GRB 100206A: MASTER-Net optical alert observations
  85. GRB 100206A: PAIRITEL Photometry of Host Candidate
  86. GRB 100206A - Keck/LRIS Spectroscopy
  87. GRB100206: MITSuME optical upper limits
  88. GRB 100206A: NOT NIR observations
  89. GRB 100206A: WHT candidate afterglow
  90. GRB 100206A, RIMOTS optical upper limits
  91. GRB 100206A: optical observations from Southern Spain
  92. GRB 100205A: GROND upper limits
  93. GRB 100206A: Swift-XRT refined analysis
  94. GRB 100206A: Fermi GBM observation
  95. GRB 100206A: Optical limit
  96. GRB 100206A: Swift-BAT refined analysis
  97. GRB 100206A: Pre-explosion imaging and host candidate
  98. GRB100205A: CFHT z'-band observation
  99. GRB 100205A: Gemini-N + NIRI photometry
  100. GRB 100113A: Fermi GBM detection

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Download all Circulars as a .tar.gz archive (updated once a day):
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