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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"

28261 results found.

  1. GRB 131227A: Gemini-North Redshift
  2. GRB 131227A: Swift-XRT refined Analysis
  3. GRB 131227A: Xinglong optical observations
  4. GRB 131227A: Swift/UVOT Upper Limits
  5. GRB 131227A: Enhanced Swift-XRT position
  6. GRB 131227A: OT candidate from KAIT Optical observations
  7. GRB 131227A: Swift detection of a burst
  8. GRB 131224A: Swift/UVOT Upper Limits
  9. GRB 131226A: Swift detection of a burst
  10. GRB 131216A: Suzaku WAM observation of the prompt emission
  11. GRB 131224A: Swift-XRT observation
  12. GRB 131225A: MAXI/GSC detection
  13. GRB 131218A: GROND Upper Limits
  14. GRB 131218A: Swift XRT and UVOT observations
  15. GRB 131216A: Fermi-LAT detection of a burst
  16. GRB 131215A: MAXI/GSC detection
  17. Trigger 581129: Swift-BAT triggered on noise
  18. GRB 131205A: GROND confirmation of afterglow
  19. INTEGRAL Weak trigger #6403: AROMA-N Optical Observation
  20. GRB 131209A: Swift XRT and UVOT observations
  21. GRB 131209A Tiled Swift observations
  22. Konus-Wind observation of GRB 131209A
  23. GRB 131209A: Fermi-LAT detection of a burst
  24. GRB131202A : GROND observations
  25. GRB131205A : GROND Observations
  26. GRB 131205A: Swift-XRT refined Analysis
  27. GRB 131205A: Swift/UVOT Upper Limits
  28. GRB 131205A: Enhanced Swift-XRT position
  29. GRB 131205A: Swift detection of a burst
  30. GRB 131127B: archival confirmation of iPTF13ecv as a CV
  31. GRB 131127B: rejection of optical counterpart candidates
  32. GRB 131126A: Fermi GBM observation
  33. GRB 131126A: iPTF upper limits on the afterglow of a short GRB
  34. GRB 090530: X-shooter redshift
  35. GRB 131127A: optically dark burst
  36. GRB 131202A: Swift/UVOT Upper Limits
  37. GRB 131202A: Swift-XRT refined Analysis
  38. GRB 131202A: RATIR Optical and NIR Observations
  39. GRB 131202A: Fermi GBM Detection
  40. GRB 131202A: Enhanced Swift-XRT position
  41. GRB 131202A: Tautenburg observations
  42. GRB 060614: theoretical derivation of the redshift and need for deeper search of the host galaxy
  43. GRB 131202A: Swift detection of a burst
  44. GRB 131127B: Bassano Bresciano Observatory optical observations of iPTF13ecv
  45. GRB 131122A: Swift-XRT Further Observation
  46. GRB 131128A: Bassano Bresciano Observatory optical upper limit
  47. GRB 131127A: RATIR Rejection of High-z Candidate
  48. GRB 131128A; Fermi GBM observation
  49. GRB 131125A: iPTF upper limits on the afterglow of a short GRB
  50. GRB 131127A: CQUEAN riz Observation
  51. GRB 131128A: GROND observations of the afterglow
  52. GRB 131128A: Swift/UVOT Detection
  53. GRB 131128A: AROMA-N Optical Observation
  54. GRB 131128A: Swift-XRT refined Analysis
  55. GRB 131128A: Kanata/HOWPol optical observation
  56. GRB 131128A: T100 observations
  57. GRB 131128A: Enhanced Swift-XRT position
  58. GRB 131128A: Nanshan afterglow confirmation
  59. GRB 131128A: MASTER-Net optical observations
  60. GRB 131128A: Nanshan afterglow candidate
  61. GRB 131128A: Swift detection of a burst
  62. GRB 131127B: Nanshan optical observations
  63. Konus-Wind observation of GRB 131127B
  64. IPN Triangulation of GRB 131127B
  65. GRB 131127B: Fermi GBM detection
  66. GRB 131127A: Swift/UVOT Upper Limits
  67. GRB 131127A: AROMA-N Optical Observation
  68. GRB 131127A: RATIR Optical and NIR Observations, High-z Candidate
  69. Fermi407254341: iPTF optical afterglow candidates
  70. GRB 131127A: Swift-XRT refined Analysis
  71. GRB 131127A. 1.5m OSN optical limit
  72. GRB 131127A: Enhanced Swift-XRT position
  73. GRB 131127A: Mondy optical upper limit
  74. GRB 131127A: Nanshan optical upper limit
  75. GRB 131127A: Swift detection of a burst
  76. GRB 131122A: Swift/UVOT Upper Limits
  77. GRB 131122A: Upper limit from NOT imaging
  78. GRB 131122A: Swift-XRT observations
  79. Konus-Wind observation of GRB 131118A
  80. GRB 131120A: Swift detection of a burst
  81. GRB 131118A: Fermi GBM detection
  82. GRB 131108A: VLA Observations
  83. GRB 131117A: Swift/UVOT Detection
  84. GRB 131117A: Swift-XRT refined Analysis
  85. GRB 131117A: VLT/X-shooter redshift
  86. GRB 131117A: GROND confirmation of the afterglow and photo-z.
  87. GRB 131117A: Enhanced Swift-XRT position
  88. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  89. GRB 131117A: Swift detection of a burst
  90. GRB 131110A: Swift-XRT and UVOT upper limits
  91. GRB 131031A: Mondy optical observations
  92. GRB 131108A: ISON Blagoveshensk upper limit
  93. GRB 131108A: optical observations
  94. GRB 131030A: MITSuME Akeno Optical observation
  95. Konus-Wind observation of GRB 131108A
  96. GRB 131108A: CARMA 3mm detection
  97. GRB 131108A: Fermi GBM observation
  98. GRB 131108A: Swift/UVOT Detection
  99. GRB 131108A: RATIR Optical and NIR Observations
  100. GRB 131108A: Swift-XRT observations

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