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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"

20512 results found.

  1. GRB 131229A: CARMA 3mm observations
  2. GRB 131229A: Magellan upper limit
  3. GRB 131229A: GROND observations
  4. GRB 131229A: Swift/UVOT Upper Limits
  5. GRB 131227A: GROND Upper Limits
  6. GRB 131229A: KAIT Optical Upper Limit
  7. GRB 131229A: P60 nondetection
  8. GRB 131224A: 5.8 GHz VLA observations
  9. GRB 131227A: P60 Limits
  10. GRB 131227A: Gemini-North Redshift
  11. GRB 131227A: Xinglong optical observations
  12. GRB 131227A: Swift/UVOT Upper Limits
  13. GRB 131227A: OT candidate from KAIT Optical observations
  14. GRB 131224A: Swift/UVOT Upper Limits
  15. GRB 131225A: MASTER-Net optical observations
  16. GRB 131224A: Swift-XRT observation
  17. GRB 131224A: MASTER-Net early optical observations
  18. GRB 131218A: GROND Upper Limits
  19. GRB 131218A: Swift XRT and UVOT observations
  20. GRB 131218A: Zadko observatory - Gingin optical candidate
  21. GRB 131218A: TAROT La Silla observatory optical observations
  22. GRB 131205A: GROND confirmation of afterglow
  23. GRB 131209A: Swift XRT and UVOT observations
  24. GRB 131209A Tiled Swift observations
  25. GRB131202A : GROND observations
  26. GRB131205A : GROND Observations
  27. GRB 131205A: Swift/UVOT Upper Limits
  28. GRB 131205A: Zadko observatory - Gingin optical observations
  29. GRB 131202A: theoretical estimation of the redshift
  30. GRB 131127B: rejection of optical counterpart candidates
  31. GRB 090530: X-shooter redshift
  32. GRB 131127A: optically dark burst
  33. GRB 131202A: Swift/UVOT Upper Limits
  34. GRB 131202A: RATIR Optical and NIR Observations
  35. GRB 131202A: Bassano Bresciano Observatory optical upper limit
  36. GRB 131202A: Tautenburg observations
  37. GRB 060614: theoretical derivation of the redshift and need for deeper search of the host galaxy
  38. GRB 131127B: Bassano Bresciano Observatory optical observations of iPTF13ecv
  39. GRB 131128A: Bassano Bresciano Observatory optical upper limit
  40. GRB 131127A: RATIR Rejection of High-z Candidate
  41. GRB 131125A: MASTER-Net very early optical observations
  42. GRB 131128A: GROND observations of the afterglow
  43. GRB 131128A: Swift/UVOT Detection
  44. GRB 131127B: Bassano Bresciano Observatory optical observations
  45. GRB 131128A: T100 observations
  46. GRB 131128A: Nanshan afterglow confirmation
  47. GRB 131128A: MASTER-Net optical observations
  48. GRB 131128A: Nanshan afterglow candidate
  49. GRB 131127B: MASTER-Net optical observations
  50. GRB 131127A: Bassano Bresciano Observatory optical upper limit
  51. GRB 131127B: Nanshan optical observations
  52. GRB 131127A: Swift/UVOT Upper Limits
  53. GRB 131127A: RATIR Optical and NIR Observations, High-z Candidate
  54. Fermi407254341: iPTF optical afterglow candidates
  55. GRB 131127A. 1.5m OSN optical limit
  56. GRB 131127A: Nanshan optical upper limit
  57. GRB 131127A: MASTER-NET optical observations
  58. GRB 131122A: Swift/UVOT Upper Limits
  59. GRB 131122A: Swift-XRT observations
  60. GRB 131122A: i-band observations from NOT
  61. GRB 131122A (INTEGRAL trigger N6392): MASTER-NET optical observation
  62. GRB 131108A: VLA Observations
  63. GRB 131030A, Optical Observations
  64. GRB 131117A: TAROT La Silla observatory optical observations
  65. GRB 131117A: Swift/UVOT Detection
  66. GRB 131117A: VLT/X-shooter redshift
  67. GRB 131117A: GROND confirmation of the afterglow and photo-z.
  68. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  69. GRB 130925A: HST imaging
  70. GRB 131110A: Swift-XRT and UVOT upper limits
  71. GRB 131031A: Mondy optical observations
  72. GRB 131108A: optical observations
  73. GRB 131108A: Continued RATIR Optical and NIR Observations
  74. GRB 131108A: AGILE/GRID observation
  75. GRB 131108A: CARMA 3mm detection
  76. GRB 131108A: Swift/UVOT Detection
  77. GRB 131108A: RATIR Optical and NIR Observations
  78. GRB 131108A: Swift-XRT observations
  79. GRB 131108A: TAROT-Calern optical observation
  80. GRB 131108A: Fermi-LAT refined analysis
  81. GRB 131108A: NOT optical observations
  82. GRB 131108A: Redshift from 10.4m GTC
  83. GRB 131108A: 1.23m CAHA optical candidate
  84. GRB 131108A: Swift detection of a possible X-ray afterglow
  85. GRB 131108A Tiled Swift observations
  86. GRB 131030A: RATIR Optical and NIR Upper Limits
  87. GRB 131030A: Continued RATIR Optical and NIR Observations
  88. GRB 131105A: Swift/UVOT Upper Limits
  89. GRB 131103A: VLT/X-shooter redshift
  90. GRB 131105A: VLT/X-shooter redshift
  91. GRB 131105A: TAROT La Silla observatory optical observations
  92. GRB 131103A: NOT and VLT observations
  93. GRB 131030A: Continued RATIR Optical and NIR Observations
  94. GRB 131103A: Swift/UVOT Detection
  95. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  96. GRB131031A: RATIR Optical and NIR Observations
  97. GRB 131018B: RATIR Optical/NIR Observations
  98. GRB 131030A: Continued RATIR Optical and NIR Observations
  99. GRB 131030A: the 2nd epoch of SAO RAS observations
  100. GRB 131031A: Swift/UVOT Upper Limits

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