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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"

15985 results found.

  1. GRB 100418A: host galaxy detection in the SDSS
  2. GRB100414A: SAO RAS optical observations
  3. GRB 100418A: ROTSE-III Optical Limits
  4. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  5. GRB 100413A: Radio Afterglow Detection with the EVLA
  6. GRB 100414A: Gemini-N observation (correction)
  7. GRB 100414A: GROND Detection of the Optical Afterglow
  8. GRB 100413A: Swift/UVOT Upper Limits
  9. GRB 100413: xinglong TNT optical upper limit
  10. GRB 100413A: MASTER-Net optical observations
  11. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  12. MASTER observations on the Swift second trigger on LS V +44 17
  13. GRB 100331B: GROND Upper limits
  14. Master-Net observations on the Swift trigger on LS V +44 17
  15. GRB 100401A: Swift/UVOT Upper Limit
  16. GRB 100316A: R-band limit
  17. GRB 100331B: Swift/UVOT Upper Limits
  18. GROND observations of GRB100316D/SN2010bh
  19. Emerging Supernova in the Afterglow of GRB 100316D
  20. SGR 1833-0832: Swift/UVOT Upper Limits
  21. GRB 100319A: correction to GCN 10527
  22. GRB 100219A: MASTER-Net optical alert observations
  23. GRB 100316D: Pre-burst emission measured by BAT
  24. GRB 100219A: optical upper limit
  25. GRB 100316A: optical observations in CrAO
  26. GRB 100316D: Swift XRT enhanced position and further refined analysis
  27. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  28. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  29. GRB 100316B: Swift/UVOT observations
  30. GRB 100316A: TAROT Calern observatory optical observations
  31. GRB 100316B: VLT/X-shooter redshift
  32. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  33. GRB 100316B: Swift detection of a burst with optical counterpart
  34. GRB 100316 optical candidate from 1.23m CAHA telescope
  35. GRB 100316 optical candidate from 1.23m CAHA telescope
  36. GRB100305A: Optical upper limits at IAO
  37. GRB 100305A: Gemini z'-band observation
  38. GRB 100305A Optical Observations
  39. GRB 100305A: P60 Observations
  40. GRB 100302A: Swift/UVOT Upper Limits
  41. GRB 100302A: Optical observations at Crni Vrh
  42. GRB 100302A: MASTER-Net optical alert observations
  43. GRB 100206A: optical observations in CrAO
  44. GRB 100206A: optical observations in Terskol
  45. GRB 100213B: Mondy optical observations
  46. GRB 100219A: optical observations
  47. GRB 100219A: GAO 150cm telescope Optical Observation
  48. GRB 100219A - Gemini South Spectroscopy
  49. GRB 100219A: VLT/X-shooter redshift
  50. GRB100219A Akeno and Okayama MITSuME Optical Observation
  51. GRB 100219A: NOT OA observations
  52. GRB 100219A: Swift/UVOT Detection of the Optical Afterglow
  53. GRB 100213B: GRT Optical Observation
  54. GRB 100213A: GRT Optical Observation
  55. GRB 100213B: Swift/UVOT Upper Limits
  56. GRB 100213A: Swift/UVOT Upper Limits
  57. GRB 100213B: NOT optical observations
  58. GRB 100206A: Second epoch Gemini-north observations and afterglow limits
  59. Swift/UVOT observations of GRB120212A
  60. GRB 100212A: candidate optical afterglow
  61. GRB 091127: Detection of a Supernova
  62. GRB 100205A: Keck limits on an underlying host galaxy
  63. GRB 100205A: BOAO/LOAO zYJK observation
  64. GRB 100206A: Gemini-North observations
  65. GRB 100206A: Swift/UVOT Upper Limits
  66. GRB 100131A: MASTER-Net optical alert observations
  67. GRB 100206A: MASTER-Net optical alert observations
  68. GRB 100206A: PAIRITEL Photometry of Host Candidate
  69. GRB100206: MITSuME optical upper limits
  70. GRB 100206A, RIMOTS optical upper limits
  71. GRB 100206A: optical observations from Southern Spain
  72. GRB 100206A: Optical limit
  73. GRB 100205A: NOT optical observations
  74. GRB 100122A: MASTER-Net optical observations
  75. GRB091109A: VLT/FORS2 spectroscopic redshift
  76. GRB 100117A: candidate optical afterglow
  77. GRB 100117A: Optical object inside the revised XRT error circle
  78. GRB100117A: Possible afterglow from NOT observation
  79. NOT observation of GRB100115A localization
  80. GRB 100111A: PAIRITEL NIR Upper Limits
  81. GRB 100111A: NOT optical observations
  82. GRB 100111A: Swift detection of a burst with an optical afterglow
  83. Swift/BAT Detects an Outburst from XTE J1901+014
  84. GRB 100103A: Swift/UVOT Upper Limits
  85. GRB 091230: Swift-XRT observation
  86. GRB 091230: GROND optical/NIR afterglow candidate
  87. Swift Trigger 381434 is not a GRB
  88. GRB 091221: Swift/UVOT refined analysis
  89. GRB 091221: UVOT Confirmation of an Optical Afterglow
  90. GRB 091221: ROTSE-III Detection of Optical Counterpart
  91. GRB 091215: Faulkes Telescope North observations
  92. GRB 091208B: Xinglong TNT optical observation
  93. GRB 091208A: GAO 150cm telescope Optical Observation
  94. GRB 091208B: GAO 150cm telescope Optical Observation
  95. GRB 091208B: optical observations
  96. GRB091208B: NOT optical observations
  97. GRB091208B: Swift/UVOT refined analysis
  98. GRB 091208B: Faulkes Telescope North and South Optical Afterglow
  99. GRB 091208A, RIMOTS optical upper limits
  100. GRB 091208B: MITSuME Akeno Optical Observation

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