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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"

18508 results found.

  1. GRB 110206A: GROND detection of afterglow candidate
  2. GRB 110206A: Swift detection of a probable X-ray afterglow
  3. GRB 110206A: TAROT La Silla observatory optical observations
  4. GRB110205A: MITSuME Ishigakijima Optical Observation
  5. GRB110205A: MITSuME Okayama Optical Observation
  6. GRB 110205A: Swift/UVOT Continuing Observations
  7. Observations GRB 110205A
  8. GRB 110205A: Newcastle Observatory Optical Observations
  9. GRB 110205A: Swift-XRT refined Analysis
  10. GRB 110205A: LOAO B/R Observation
  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. GRB110128A: MITSuME Okayama optical upper limits
  23. GRB 101112A: Maidanak and CrAO optical observations
  24. GRB110128A: TNG NIR observations
  25. GRB 110128A: Swift/UVOT observations
  26. GRB 110128A: Swift-XRT refined Analysis
  27. GRB 110128A: WHT redshifts of nearby field galaxies
  28. GRB 110128A: Enhanced Swift-XRT position
  29. GRB 110128A: Afterglow detection from NOT
  30. GRB 110128A: TAROT Calern observatory upper limits
  31. GRB 110128A: Swift detection of a burst
  32. GRB 110106B, radio observations
  33. GRB 110120A: MASTER optical observations
  34. IPN triangulation of GRB 110120A
  35. GRB 101225A: CQUEAN optical observation
  36. GRB 110106A: CrAO optical observations
  37. GRB 110112A: optical upper limit
  38. GRB110119: Swift/UVOT Detection
  39. GRB110119A: MITSuME Okayama optical upper limits
  40. GRB 110119A: PAIRITEL NIR Afterglow Detection
  41. GRB 110119A: Enhanced Swift-XRT position
  42. GRB 110119A: Swift detection of a burst with an optical detection
  43. GRB 101219B: GROND detection of a SN signature
  44. Swift-BAT trigger 442771 is a noise fluctuation
  45. New feature in Fermi GBM GRB Ground Position Notices
  46. Swift-BAT Trigger 442539 is not a GRB
  47. Swift Trigger 442539 is probably not a GRB
  48. Short GRB 110112B : early optical limit by "Pi of the Sky"
  49. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  50. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  51. GRB 110107A: Swift-XRT afterglow confirmation
  52. GRB 101225A: Redshift retraction and results of additional photometric follow-up at the NOT
  53. GRB 110112A: Swift/UVOT upper limits
  54. GRB 110112A: WHT candidate afterglow/host galaxy
  55. GRB 110112A: Enhanced Swift-XRT position
  56. GRB 110112A: Swift detection of a possible short burst
  57. GRB 110107A: Swift/UVOT upper limits
  58. GRB 101219b. Possible radio afterglow detection.
  59. GRB 110107A: Swift-XRT Afterglow Candidate
  60. GRB 110106A: TNG NIR observations
  61. GRB 110106A: ISAS-Kanazawa optical upper limit
  62. GRB 110106A: MITSuME Okayama optical upper limits
  63. GRB 110106B: Enhanced Swift-XRT position
  64. GRB 110106A: Swift/UVOT Upper Limits
  65. GRB 110106A: Enhanced Swift-XRT position
  66. GRB 110106B: Swift detection of a burst
  67. GRB 110106A: TNG optical observations and candidate counterparts
  68. GRB 110106A: Swift detection of a burst
  69. GRB 101225A: Host galaxy
  70. GRB110102A: Swift/UVOT observations
  71. GRB110102A: MITSuME Okayama Optical Observation
  72. GRB 110102A: Enhanced Swift-XRT position
  73. GRB 110102A: Swift detection of a burst with an optical detection
  74. GRB 101225A: P60 Observations
  75. GRB 101225A: MAXI/GSC observations
  76. GRB 101225A Late-time emission observed by Swift-BAT
  77. GRB 101225A, Swift-BAT refined analysis
  78. GRB 101225A: Swift/UVOT Detection
  79. GRB 101225A: Enhanced Swift-XRT position
  80. Trigger 441015 / GRB 101225A: Further NOT optical observation
  81. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  82. GRB 101225A (Swift trigger 441015): optical upper limit
  83. Trigger 441015: Swift detection of a possible burst or transient
  84. GRB 101224A: NOT optical observation
  85. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  86. GRB 101224A: Swift/UVOT Upper Limits
  87. GRB 101224A: Swift-XRT refined Analysis
  88. GRB101224A: MITSuME Okayama optical upper limits
  89. GRB 101224A - UVOT-enhanced XRT position
  90. GRB 101224A: Swift detection of a short burst
  91. GRB 101219A: Chandra Observations
  92. GRB 101219B: Swift/UVOT refined analysis
  93. GRB 101219B: Swift-XRT refined Analysis
  94. GRB 101219B: Enhanced Swift-XRT position
  95. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  96. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  97. GRB 101219A: IAC80 optical observations
  98. GRB 101219B: Swift detection of a burst with an optical afterglow
  99. GRB 101219A: Swift/UVOT Upper Limits
  100. GRB 101219A: GROND Upper limits

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