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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"

28262 results found.

  1. GRB 131227A: P60 Limits
  2. GRB 131227A: Gemini-North Redshift
  3. GRB 131227A: Swift-XRT refined Analysis
  4. GRB 131227A: Xinglong optical observations
  5. GRB 131227A: Swift/UVOT Upper Limits
  6. GRB 131227A: Enhanced Swift-XRT position
  7. GRB 131227A: OT candidate from KAIT Optical observations
  8. GRB 131227A: Swift detection of a burst
  9. GRB 131224A: Swift/UVOT Upper Limits
  10. GRB 131226A: Swift detection of a burst
  11. GRB 131216A: Suzaku WAM observation of the prompt emission
  12. GRB 131224A: Swift-XRT observation
  13. GRB 131225A: MAXI/GSC detection
  14. GRB 131218A: GROND Upper Limits
  15. GRB 131218A: Swift XRT and UVOT observations
  16. GRB 131216A: Fermi-LAT detection of a burst
  17. GRB 131215A: MAXI/GSC detection
  18. Trigger 581129: Swift-BAT triggered on noise
  19. GRB 131205A: GROND confirmation of afterglow
  20. INTEGRAL Weak trigger #6403: AROMA-N Optical Observation
  21. GRB 131209A: Swift XRT and UVOT observations
  22. GRB 131209A Tiled Swift observations
  23. Konus-Wind observation of GRB 131209A
  24. GRB 131209A: Fermi-LAT detection of a burst
  25. GRB131202A : GROND observations
  26. GRB131205A : GROND Observations
  27. GRB 131205A: Swift-XRT refined Analysis
  28. GRB 131205A: Swift/UVOT Upper Limits
  29. GRB 131205A: Enhanced Swift-XRT position
  30. GRB 131205A: Swift detection of a burst
  31. GRB 131127B: archival confirmation of iPTF13ecv as a CV
  32. GRB 131127B: rejection of optical counterpart candidates
  33. GRB 131126A: Fermi GBM observation
  34. GRB 131126A: iPTF upper limits on the afterglow of a short GRB
  35. GRB 090530: X-shooter redshift
  36. GRB 131127A: optically dark burst
  37. GRB 131202A: Swift/UVOT Upper Limits
  38. GRB 131202A: Swift-XRT refined Analysis
  39. GRB 131202A: RATIR Optical and NIR Observations
  40. GRB 131202A: Fermi GBM Detection
  41. GRB 131202A: Enhanced Swift-XRT position
  42. GRB 131202A: Tautenburg observations
  43. GRB 060614: theoretical derivation of the redshift and need for deeper search of the host galaxy
  44. GRB 131202A: Swift detection of a burst
  45. GRB 131127B: Bassano Bresciano Observatory optical observations of iPTF13ecv
  46. GRB 131122A: Swift-XRT Further Observation
  47. GRB 131128A: Bassano Bresciano Observatory optical upper limit
  48. GRB 131127A: RATIR Rejection of High-z Candidate
  49. GRB 131128A; Fermi GBM observation
  50. GRB 131125A: iPTF upper limits on the afterglow of a short GRB
  51. GRB 131127A: CQUEAN riz Observation
  52. GRB 131128A: GROND observations of the afterglow
  53. GRB 131128A: Swift/UVOT Detection
  54. GRB 131128A: AROMA-N Optical Observation
  55. GRB 131128A: Swift-XRT refined Analysis
  56. GRB 131128A: Kanata/HOWPol optical observation
  57. GRB 131128A: T100 observations
  58. GRB 131128A: Enhanced Swift-XRT position
  59. GRB 131128A: Nanshan afterglow confirmation
  60. GRB 131128A: MASTER-Net optical observations
  61. GRB 131128A: Nanshan afterglow candidate
  62. GRB 131128A: Swift detection of a burst
  63. GRB 131127B: Nanshan optical observations
  64. Konus-Wind observation of GRB 131127B
  65. IPN Triangulation of GRB 131127B
  66. GRB 131127B: Fermi GBM detection
  67. GRB 131127A: Swift/UVOT Upper Limits
  68. GRB 131127A: AROMA-N Optical Observation
  69. GRB 131127A: RATIR Optical and NIR Observations, High-z Candidate
  70. Fermi407254341: iPTF optical afterglow candidates
  71. GRB 131127A: Swift-XRT refined Analysis
  72. GRB 131127A. 1.5m OSN optical limit
  73. GRB 131127A: Enhanced Swift-XRT position
  74. GRB 131127A: Mondy optical upper limit
  75. GRB 131127A: Nanshan optical upper limit
  76. GRB 131127A: Swift detection of a burst
  77. GRB 131122A: Swift/UVOT Upper Limits
  78. GRB 131122A: Upper limit from NOT imaging
  79. GRB 131122A: Swift-XRT observations
  80. Konus-Wind observation of GRB 131118A
  81. GRB 131120A: Swift detection of a burst
  82. GRB 131118A: Fermi GBM detection
  83. GRB 131108A: VLA Observations
  84. GRB 131117A: Swift/UVOT Detection
  85. GRB 131117A: Swift-XRT refined Analysis
  86. GRB 131117A: VLT/X-shooter redshift
  87. GRB 131117A: GROND confirmation of the afterglow and photo-z.
  88. GRB 131117A: Enhanced Swift-XRT position
  89. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  90. GRB 131117A: Swift detection of a burst
  91. GRB 131110A: Swift-XRT and UVOT upper limits
  92. GRB 131031A: Mondy optical observations
  93. GRB 131108A: ISON Blagoveshensk upper limit
  94. GRB 131108A: optical observations
  95. GRB 131030A: MITSuME Akeno Optical observation
  96. Konus-Wind observation of GRB 131108A
  97. GRB 131108A: CARMA 3mm detection
  98. GRB 131108A: Fermi GBM observation
  99. GRB 131108A: Swift/UVOT Detection
  100. GRB 131108A: RATIR Optical and NIR Observations

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