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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"

20967 results found.

  1. GRB 100316B: Swift/UVOT observations
  2. GRB 100316A: TAROT Calern observatory optical observations
  3. GRB 100316A: Swift-XRT 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. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  10. GRB 100316 optical candidate from 1.23m CAHA telescope
  11. GRB 100316 optical candidate from 1.23m CAHA telescope
  12. GRB 100316A: Swift/UVOT Observations
  13. GRB 100305A: Super-LOTIS early observations
  14. GRB100302A : LOAO observations and Lulin afterglow analysis
  15. GRB 100305A: Gemini z'-band observation
  16. GRB 100305A: Swift/UVOT Upper Limits
  17. GRB 100305A Optical Observations
  18. GRB 100305A: PAIRITEL NIR Upper Limits
  19. GRB 100305A: P60 Observations
  20. GRB 100302A: Swift/UVOT Upper Limits
  21. GRB 100302A: Optical observations at Crni Vrh
  22. GRB 100302A: MASTER-Net optical alert observations
  23. GRB 1000302A : A possible afterglow candidate
  24. GRB 100302A: Skynet/DAO Observations
  25. GRB 100206A: optical observations in CrAO
  26. GRB 100206A: optical observations in Terskol
  27. GRB 100213B: Mondy optical observations
  28. GRB 100219A: optical observations
  29. GRB 100224A SHB found in ground analysis of BAT data
  30. GRB
  31. GRB 100219A: X-shooter refined analysis
  32. GRB 100219A - Gemini South Spectroscopy
  33. GRB 100216A: Swift/UVOT Observations
  34. GRB 100219A: VLT/X-shooter redshift
  35. GRB 100219A: GROND observations
  36. GRB 100219A: NOT OA observations
  37. GRB 100219A: Swift/UVOT Detection of the Optical Afterglow
  38. GRB 100216A: XRT Refined Analysis
  39. GRB 100213B: Gemini-N Observations
  40. GRB 100213B: Swift/UVOT Upper Limits
  41. GRB 100213A: Swift/UVOT Upper Limits
  42. GRB 100213B: PAIRITEL NIR Upper Limits
  43. GRB 100213A: SARA observations
  44. GRB 100213A: Swift XRT refined analysis
  45. GRB 100213B: NOT optical observations
  46. GRB 100206A: Second epoch Gemini-north observations and afterglow limits
  47. Swift/UVOT observations of GRB100212A - correction of the name of the burst
  48. Swift/UVOT observations of GRB120212A
  49. GRB 100212A: candidate optical afterglow
  50. GRB 091127: Detection of a Supernova
  51. GRB 100205A: Keck limits on an underlying host galaxy
  52. GRB 100206A: GROND upper limits
  53. GRB 100206A: Gemini-North observations
  54. GRB 100206A: Swift/UVOT Upper Limits
  55. GRB 100131A: MASTER-Net optical alert observations
  56. GRB 100206A: YNAO-GMG observations
  57. GRB 100206A: MASTER-Net optical alert observations
  58. GRB 100206A: PAIRITEL Photometry of Host Candidate
  59. GRB 100206A - Keck/LRIS Spectroscopy
  60. GRB 100206A: NOT NIR observations
  61. GRB 100206A: WHT candidate afterglow
  62. GRB 100206A: optical observations from Southern Spain
  63. GRB 100205A: GROND upper limits
  64. GRB 100205A: Swift UVOT upper limits
  65. GRB 100205A: Swift XRT refined analysis
  66. GRB 100205A: Gemini-South Observations
  67. GRB 100205A: Super-LOTIS early observations
  68. GRB 100205A: NOT optical observations
  69. GRB 100122A: MASTER-Net optical observations
  70. GRB 100115A: Swift-XRT refined analysis
  71. GRB 100117A: candidate optical afterglow
  72. GRB 100119A: Swift detection of a burst
  73. GRB 100117A: Gemini North spectroscopy
  74. Swift/UVOT refined analysis of GRB100117A
  75. GRB 100117A: Optical object inside the revised XRT error circle
  76. GRB 100117A: Gemini-North upper limit
  77. GRB 100117A: Magellan IMACS imaging
  78. GRB 100117A: Gemini South Imaging and CFHT Pre-Explosion Images
  79. GRB100117A: Possible afterglow from NOT observation
  80. GRB 100115A: Gemini-N photometry
  81. GRB 100115A: SARA Afterglow Candidate
  82. GRB 100111A: PAIRITEL NIR Upper Limits
  83. GRB 100111A: Swift UVOT Refined Analysis
  84. GRB 100111A: NOT optical observations
  85. Swift/BAT Detects an Outburst from XTE J1901+014
  86. GRB 100103A: GROND Upper Limits
  87. GRB 100103A: Swift-XRT team refined analysis
  88. GRB 091231: GROND NIR observations
  89. GRB 091230: Swift/UVOT Observations
  90. GRB 091230: GROND optical/NIR afterglow candidate
  91. Swift Trigger 381434 is not a GRB
  92. GRB 091117: Swift-XRT late time observations
  93. GRB 091221: Swift/UVOT refined analysis
  94. GRB 091221, GROND observations
  95. GRB 091221: ROTSE-III Detection of Optical Counterpart
  96. Swift trigger 379449 (possible GRB) is not a burst
  97. GRB 091215: Faulkes Telescope North observations
  98. GRB 091208B: Xinglong TNT optical observation
  99. GRB 091208B: GAO 150cm telescope Optical Observation
  100. GRB 091208B: optical observations

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