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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"

28093 results found.

  1. GRB 110128A: Fermi GBM detection
  2. GRB 110201A: Swift-XRT refined Analysis
  3. GRB110201A: MITSuME Okayama optical upper limits
  4. Swift/UVOT observations of GRB110201A
  5. GRB 110201A: Swift-BAT refined analysis
  6. GRB 110201A: Swift detection of a burst
  7. GRB110112B: EVLA Observations
  8. GRB110112A: EVLA Observations
  9. GRB110128A: MITSuME Okayama optical upper limits
  10. GRB 110125A: Fermi GBM detection
  11. GRB 101112A: Maidanak and CrAO optical observations
  12. GRB110128A: TNG NIR observations
  13. GRB 110128A, Swift-BAT refined analysis
  14. GRB 110128A: Swift/UVOT observations
  15. GRB 110128A: Swift-XRT refined Analysis
  16. GRB 110120A: Suzaku WAM observation of the prompt emission
  17. GRB 110128A: WHT redshifts of nearby field galaxies
  18. GRB 110128A: Enhanced Swift-XRT position
  19. GRB 110128A: Afterglow detection from NOT
  20. GRB 110128A: TAROT Calern observatory upper limits
  21. GRB 110128A: Swift detection of a burst
  22. IBAS Alerts n. 6130 and 6131 are not due to a GRB
  23. GRB 110123A: Fermi GBM detection
  24. GRB 110106B, radio observations
  25. GRB 110120A: MASTER optical observations
  26. GRB 101224A, the review of the sky area in plate archives
  27. IPN triangulation of GRB 110120A
  28. GRB 101225A: CQUEAN optical observation
  29. GRB 110106A: CrAO optical observations
  30. GRB 110119A: Fermi GBM detection
  31. GRB 110120A: Fermi GBM detection
  32. GRB 110119A: Suzaku WAM observation of the prompt emission
  33. GRB 110112A: optical upper limit
  34. GRB110119: Swift/UVOT Detection
  35. GRB 110119A: Swift-XRT refined Analysis
  36. GRB110119A: MITSuME Okayama optical upper limits
  37. GRB 110119A: Swift-BAT refined analysis
  38. GRB 110119A: PAIRITEL NIR Afterglow Detection
  39. GRB 110119A: Enhanced Swift-XRT position
  40. GRB 110119A: Swift detection of a burst with an optical detection
  41. GRB110106A, mm-radio observations
  42. GRB 101219B: GROND detection of a SN signature
  43. Swift-BAT trigger 442771 is a noise fluctuation
  44. New feature in Fermi GBM GRB Ground Position Notices
  45. Swift-BAT Trigger 442539 is not a GRB
  46. Swift Trigger 442539 is probably not a GRB
  47. Short GRB 110112B : early optical limit by "Pi of the Sky"
  48. GRB101225A - timing analysis
  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: HST observations - no host detected
  53. GRB 110112A: Swift-XRT refined Analysis
  54. GRB 110112A: Swift/UVOT upper limits
  55. GRB 110112A: WHT candidate afterglow/host galaxy
  56. GRB 110112A: Swift-BAT refined analysis
  57. GRB 110112A: Enhanced Swift-XRT position
  58. GRB110112A: TNT optical afterglow candidate
  59. GRB 110112A: Swift detection of a possible short burst
  60. GRB 110107A: Swift/UVOT upper limits
  61. GRB 101219b. Possible radio afterglow detection.
  62. GRB 110107A: Swift-XRT Afterglow Candidate
  63. GRB 110106B: Fermi GBM detection
  64. GRB 110106B: Swift-XRT refined Analysis
  65. GRB 110106A: TNG NIR observations
  66. GRB 110106A: ISAS-Kanazawa optical upper limit
  67. GRB 110106A: MITSuME Okayama optical upper limits
  68. GRB 110106B: Swift-BAT refined analysis
  69. GRB 110106B: Enhanced Swift-XRT position
  70. GRB 110106A: Swift/UVOT Upper Limits
  71. GRB 110106A: TNG redshift of the closeby galaxy
  72. GRB 110106A: Swift-XRT refined Analysis
  73. GRB 110106A: Swift-BAT refined analysis
  74. GRB 110106A: Enhanced Swift-XRT position
  75. GRB 110106B: Swift detection of a burst
  76. GRB 110106A: TNG optical observations and candidate counterparts
  77. GRB 110106A: Swift detection of a burst
  78. GRB 101225A: Host galaxy
  79. GRB 110102A: Swift-XRT refined Analysis
  80. GRB110102A: Swift/UVOT observations
  81. GRB110102A: MITSuME Okayama Optical Observation
  82. GRB 110102A: Fermi GBM observation
  83. GRB 110102A: Swift-BAT refined analysis
  84. GRB 110102A: Enhanced Swift-XRT position
  85. GRB 110102A: Swift detection of a burst with an optical detection
  86. GRB 101225A: optical break from NOT observation
  87. GRB 101225A: P60 Observations
  88. GRB 101225A: MAXI/GSC observations
  89. GRB 101225A Late-time emission observed by Swift-BAT
  90. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  91. GRB 101225A, Swift-BAT refined analysis
  92. GRB 101225A: Swift/UVOT Detection
  93. GRB 101225A: Swift-XRT refined Analysis
  94. GRB 101225A: Enhanced Swift-XRT position
  95. Trigger 441015 / GRB 101225A: Further NOT optical observation
  96. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  97. GRB 101225A (Swift trigger 441015): optical upper limit
  98. Trigger 441015: Swift detection of a possible burst or transient
  99. GRB 101224A: NOT optical observation
  100. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle

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