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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"

16240 results found.

  1. GRB 140110A: Reported UVOT OT not GRB afterglow
  2. GRB 140110A: OT detection in Swift/UVOT imaging
  3. GRB 140108A: Mondy optical upper limit
  4. GRB 140105A: MASTER-Net early optical observations and time correction
  5. GRB 131231A: AAO optical observations
  6. GRB 140108A: Swift/UVOT Detection
  7. GRB 140108A: Mondy optical observations
  8. GRB 140108A: D50+BART optical candidate detection
  9. GRB 140108A: 1.23m CAHA observations
  10. GRB 140108A: MASTER-Net OT detection
  11. GRB 140105A: HCT Observations
  12. GRB 140105A: continued iPTF observations and rejection of optical candidates
  13. GRB 140105A/Fermi410578384: MASTER-Net early optical observations
  14. LOAO R-band Observation of GRB 140102A
  15. GRB 140105A: Fermi GBM detection
  16. Fermi410578384: iPTF optical afterglow candidates for a possible short GRB
  17. GRB 140102A: BOOTES-4 early optical observations
  18. GRB 140103A: Lulin Optical r-band Observations
  19. GRB 131231A : Lulin Optical Observations
  20. GRB 131231A: CARMA 3mm detection
  21. GRB140104A : Xinglong TNT observation. A bright star is located nearby
  22. GRB 140102A, Optical Observations
  23. GRB 131231A, Optical Observations
  24. GRB 131231A: Swift/UVOT Observations of the Optical Afterglow
  25. GRB 140103A: Swift/UVOT Upper Limits
  26. GRB 140102A: GROND observations
  27. GRB 140103A: MASTER-Net optical observations
  28. GRB 140102A: I-band observations from IAC80 and 1.23m CAHA telescopes
  29. GRB 140102A: Early optical observations from Nanshan
  30. GRB 140102A: Swift detection of a burst with optical counterpart
  31. GRB 131231A: Swift-XRT observations
  32. GRB 131231A : xinglong TNT optical observation
  33. GRB 131231A: VLT/X-shooter redshift
  34. GRB 131231A: Fermi GBM detection
  35. GRB 131231A: iPTF optical afterglow candidate coincident with Nanshan detection
  36. GRB 131231A: afterglow confirmation from the NOT
  37. GRB 131229A: GROND observations
  38. GRB 131229A: Swift/UVOT Upper Limits
  39. GRB 131227A: GROND Upper Limits
  40. GRB 131229A: KAIT Optical Upper Limit
  41. GRB 131227A: P60 Limits
  42. GRB 131227A: Xinglong optical observations
  43. GRB 131227A: Swift/UVOT Upper Limits
  44. GRB 131227A: OT candidate from KAIT Optical observations
  45. GRB 131224A: Swift/UVOT Upper Limits
  46. GRB 131225A: MASTER-Net optical observations
  47. GRB 131224A: MASTER-Net early optical observations
  48. GRB 131218A: GROND Upper Limits
  49. GRB 131218A: Swift XRT and UVOT observations
  50. GRB 131218A: Zadko observatory - Gingin optical candidate
  51. GRB 131218A: TAROT La Silla observatory optical observations
  52. GRB 131205A: GROND confirmation of afterglow
  53. INTEGRAL Weak trigger #6403: AROMA-N Optical Observation
  54. GRB 131205A: Swift/UVOT Upper Limits
  55. GRB 131205A: Zadko observatory - Gingin optical observations
  56. GRB 131127B: Bassano Bresciano Observatory,archival confirmation of iPTF13ecv
  57. GRB 131127B: archival confirmation of iPTF13ecv as a CV
  58. GRB 131127B: rejection of optical counterpart candidates
  59. GRB 090530: X-shooter redshift
  60. GRB 131127A: optically dark burst
  61. GRB 131202A: Swift/UVOT Upper Limits
  62. GRB 131202A: RATIR Optical and NIR Observations
  63. GRB 131202A: Bassano Bresciano Observatory optical upper limit
  64. GRB 131202A : XMM-Newton planned observation
  65. GRB 060614: theoretical derivation of the redshift and need for deeper search of the host galaxy
  66. GRB 131127B: Bassano Bresciano Observatory optical observations of iPTF13ecv
  67. GRB 131128A: Bassano Bresciano Observatory optical upper limit
  68. GRB 131125A: MASTER-Net very early optical observations
  69. GRB 131128A: GROND observations of the afterglow
  70. GRB 131128A: Swift/UVOT Detection
  71. GRB 131128A: AROMA-N Optical Observation
  72. GRB 131127B: Bassano Bresciano Observatory optical observations
  73. GRB 131128A: Kanata/HOWPol optical observation
  74. GRB 131128A: T100 observations
  75. GRB 131128A: Nanshan afterglow confirmation
  76. GRB 131128A: MASTER-Net optical observations
  77. GRB 131128A: Nanshan afterglow candidate
  78. GRB 131127B: MASTER-Net optical observations
  79. GRB 131127A: Bassano Bresciano Observatory optical upper limit
  80. GRB 131127B: Nanshan optical observations
  81. IPN Triangulation of GRB 131127B
  82. GRB 131127B: Fermi GBM detection
  83. GRB 131127A: Swift/UVOT Upper Limits
  84. GRB 131127A: AROMA-N Optical Observation
  85. GRB 131127A: RATIR Optical and NIR Observations, High-z Candidate
  86. Fermi407254341: iPTF optical afterglow candidates
  87. GRB 131127A. 1.5m OSN optical limit
  88. GRB 131127A: Mondy optical upper limit
  89. GRB 131127A: Nanshan optical upper limit
  90. GRB 131127A: MASTER-NET optical observations
  91. GRB 131122A: Swift/UVOT Upper Limits
  92. GRB 131122A: i-band observations from NOT
  93. GRB 131122A: Nanshan optical upper limit
  94. GRB 131122A (INTEGRAL trigger N6392): MASTER-NET optical observation
  95. GRB 131108A: VLA Observations
  96. GRB 131030A, Optical Observations
  97. GRB 131117A: TAROT La Silla observatory optical observations
  98. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  99. GRB 131110A: Swift-XRT and UVOT upper limits
  100. GRB 131031A: Mondy optical observations

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