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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"

21770 results found.

  1. GRB 110206A: TAROT La Silla observatory optical observations
  2. GRB110205A: MITSuME Ishigakijima Optical Observation
  3. GRB110205A: MITSuME Okayama Optical Observation
  4. GRB 110205A: Swift/UVOT Continuing Observations
  5. GRB 110205A: Lulin optical observations and temporal decay index
  6. Observations GRB 110205A
  7. GRB 110205A: Swift-BAT refined analysis
  8. GRB 110205A: Newcastle Observatory Optical Observations
  9. GRB 110205A: LOAO B/R Observation
  10. GRB 101225A is likely at z~0
  11. GRB 110205A: optical flare confirmation
  12. GRB 110205A: NOT redshift confirmation
  13. GRB 110205A: Enhanced Swift-XRT position
  14. GRB 110205A: PAIRITEL NIR Afterglow Detection
  15. GRB 110205A: Swift/UVOT Confirmation of Flaring Afterglow
  16. GRB 110205A: TAROT Calern observatory detection of an optical flare
  17. GRB 110205A: TAROT Calern observatory optical detection
  18. GRB 110205A: Swift detection of a burst with an optical candidate
  19. GRB110201A: MITSuME Okayama optical upper limits
  20. Swift/UVOT observations of GRB110201A
  21. GRB 110201A: Swift detection of a burst
  22. GRB110112B: EVLA Observations
  23. GRB101224A: EVLA Observations
  24. GRB110112A: EVLA Observations
  25. GRB110128A: MITSuME Okayama optical upper limits
  26. GRB 101112A: Maidanak and CrAO optical observations
  27. GRB110128A: TNG NIR observations
  28. GRB 110128A: Swift/UVOT observations
  29. GRB 110120A: Suzaku WAM observation of the prompt emission
  30. GRB 110128A: WHT redshifts of nearby field galaxies
  31. GRB 110128A: Enhanced Swift-XRT position
  32. GRB 110128A: Afterglow detection from NOT
  33. GRB 110128A: TAROT Calern observatory upper limits
  34. GRB 110128A: Swift detection of a burst
  35. Konus-Wind observation of GRB 110120A
  36. GRB 110123A: Fermi GBM detection
  37. GRB 110106B, radio observations
  38. GRB 110120A: MASTER optical observations
  39. GRB 101224A, the review of the sky area in plate archives
  40. IPN triangulation of GRB 110120A
  41. GRB 101225A: CQUEAN optical observation
  42. GRB 110106A: CrAO optical observations
  43. GRB 110120A: Fermi GBM detection
  44. GRB 110119A: Suzaku WAM observation of the prompt emission
  45. GRB 110112A: optical upper limit
  46. GRB 110120A: MASTER optical observations
  47. GRB110119: Swift/UVOT Detection
  48. GRB110119A: MITSuME Okayama optical upper limits
  49. GRB 110119A: Swift-BAT refined analysis
  50. GRB 110119A: PAIRITEL NIR Afterglow Detection
  51. GRB 110119A: Enhanced Swift-XRT position
  52. GRB 110119A: Swift detection of a burst with an optical detection
  53. GRB110106A, mm-radio observations
  54. GRB 101219B: GROND detection of a SN signature
  55. Swift-BAT trigger 442771 is a noise fluctuation
  56. New feature in Fermi GBM GRB Ground Position Notices
  57. Swift-BAT Trigger 442539 is not a GRB
  58. Swift Trigger 442539 is probably not a GRB
  59. Short GRB 110112B : early optical limit by "Pi of the Sky"
  60. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  61. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  62. GRB 110107A: Swift-XRT afterglow confirmation
  63. GRB 101225A: Redshift retraction and results of additional photometric follow-up at the NOT
  64. GRB 110112B: A short GRB detected by INTEGRAL
  65. GRB 110112A: Swift/UVOT upper limits
  66. GRB 110112A: WHT candidate afterglow/host galaxy
  67. GRB 110112A: MASTER optical observations
  68. GRB 110112A: Enhanced Swift-XRT position
  69. GRB 110112A: Swift detection of a possible short burst
  70. GRB 110107A: Swift/UVOT upper limits
  71. GRB 101219b. Possible radio afterglow detection.
  72. GRB 110106B: MASTER early optical observations
  73. GRB 110107A: Swift-XRT Afterglow Candidate
  74. GRB 110106A: TNG NIR observations
  75. GRB 110106A: ISAS-Kanazawa optical upper limit
  76. GRB 110106A: MITSuME Okayama optical upper limits
  77. GRB 110106B: Enhanced Swift-XRT position
  78. GRB 110106A: Swift/UVOT Upper Limits
  79. GRB 110106A: Enhanced Swift-XRT position
  80. GRB 110106B: Swift detection of a burst
  81. GRB 110106A: TNG optical observations and candidate counterparts
  82. GRB 110106A: MASTER optical observations
  83. GRB 110106A: Swift detection of a burst
  84. GRB 101225A: Host galaxy
  85. Konus-Wind observation of GRB 110102A
  86. GRB110102A: Swift/UVOT observations
  87. GRB110102A: MITSuME Okayama Optical Observation
  88. GRB 110102A: Fermi GBM observation
  89. GRB 110102A: Swift-BAT refined analysis
  90. GRB 110102A: Enhanced Swift-XRT position
  91. GRB 110102A: Swift detection of a burst with an optical detection
  92. GRB 101225A: P60 Observations
  93. GRB 101225A: MAXI/GSC observations
  94. GRB 101225A Late-time emission observed by Swift-BAT
  95. GRB 101225A, Swift-BAT refined analysis
  96. GRB 101225A: Swift/UVOT Detection
  97. GRB 101225A: Enhanced Swift-XRT position
  98. Trigger 441015 / GRB 101225A: Further NOT optical observation
  99. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  100. GRB 101225A (Swift trigger 441015): optical upper limit

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