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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"

7410 results found.

  1. GRB 060707: Swift detection of a burst
  2. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  3. GRB060602A: Swift/UVOT upper limits
  4. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  5. GRB 060607: Swift detection of a burst with bright optical counterpart
  6. GRB060605: Spectral Observations and Redshift
  7. GRB 060605: Swift detection of a burst with optical counterpart
  8. GRB060604: Swift/UVOT detections
  9. GRB 060604: redshift
  10. GRB 060604: Swift detection of a burst with possible optical counterpart
  11. GRB 060602B: Swift detection of a burst
  12. GRB060602B: Watcher observations - no OT candidate
  13. GRB060602B: BOOTES-IR candidate afterglow
  14. GRB 060526: Continued emission for the Swift burst
  15. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  16. GRB 060522: REM NIR observations
  17. GRB 060522: TNG optical observations
  18. GRB 060515: Swift/XRT Team refined analysis
  19. GRB 060515: Super-LOTIS Observations
  20. GRB060515: Swift/UVOT initial observation
  21. GRB 060515: TAROT optical observation
  22. GRB 060512: 1.54m Kuiper Observations
  23. GRB 060505 - OT candidate + galaxy spectrum
  24. GRB 060512: Swift detection of a burst with an optical afterglow
  25. GRB060510B : Faulkes North Telescope detection
  26. GRB 060510b: Gemini NIR observations
  27. GRB 060510b: NIR observations
  28. GRB 060510B: MDM Observations and candidate OT
  29. GRB 060510B: Swift detection of a burst
  30. GRB060502B: improvement in the XRT afterglow position
  31. GRB 060507: Swift/UVOT Upper Limits
  32. GRB 060507: MDM Optical Upper Limit
  33. GRB 060505: Swift XRT Team Refined Analysis
  34. GRB060425: new MASTER survey method
  35. GRB 060502B MDM Follow-up Observation
  36. GRB060502B: correction to XRT position
  37. GRB 060501: P60 Observations and Candidate Retraction
  38. GRB 060502B: MASTER optical observations
  39. GRB 060502: P60 Afterglow Confirmation
  40. GRB 060501: MDM Observations
  41. GRB060501: Super-LOTIS observations
  42. GRB060501: P60 imaging and afterglow candidate
  43. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  44. GRB060428B: Swift XRT Team refined analysis
  45. GRB 060428B: Xinglong I-band limit
  46. GRB 060428B: KAIT observations
  47. GRB060428A: Swift/UVOT observations.
  48. GRB 060428b : Kiso R-band limit
  49. GRB060427:MASTER optical limit
  50. GRB 060428b: Optical afterglow candidate
  51. GRB 060428B: Swift detection of a burst
  52. GRB 060427: NIR observations
  53. GRB 060428: Swift detection of a burst
  54. GRB 060427: Swift/UVOT upper limits.
  55. GRB060425:MASTER survey observations
  56. GRB 060427: Swift detection of a burst
  57. OT 060420: Likely Not a New Cosmic Transient
  58. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  59. GRB060421: Swift/UVOT observations
  60. GRB(?)060421:MASTER optical limit
  61. GRB(?) 060421: Swift detection of a burst
  62. GRB 060418, SMARTS optical/IR afterglow observations
  63. GRB060418 : LT optical afterglow observation
  64. GRB 060418: REM candidate afterglow
  65. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  66. GRB060413: Swift/UVOT upper limits
  67. SGR 1900+14: Swift detection of an outburst
  68. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  69. GRB 060403: Swift detection of a burst
  70. H4043, an unusual high-energy transient observed by HETE
  71. GRB 060322: Confirmation of Swift XRT afterglow
  72. GRB060323: NOT optical observations
  73. GRB 060322: Swift XRT afterglow candidate
  74. GRB 060323: optical afterglow confirmed
  75. GRB 060323: Optical Observations
  76. GRB 060323: Tautenburg OT candidate retraction
  77. GRB 060323: optical observations at TNG
  78. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  79. GRB 060323: Swift/XRT position
  80. GRB 060319: WHT K-band candidate afterglow
  81. GRB060319 : Liverpool Telescope optical limit
  82. GRB060319: MASTER optical observation
  83. GRB 060319: Swift detection of a burst
  84. GRB 060313: early afterglow NIR upper limits with REM
  85. GRB060313: SSO 40inch Observations
  86. GRB 060313: PROMPT Observations
  87. GRB060313:Gemini South Observations
  88. GRB060313: optical observations of the afterglow candidate
  89. GRB 060313: Swift-BAT detection of a bright short hard burst
  90. GRB060312: Swift UVOT observation
  91. GRB 060306: Swift detection of a bright burst
  92. GRB 060223B: Swift XRT possible afterglow
  93. GRB 060223: Swift detection of a burst
  94. GRB060218: Radio Afterglow Discovery
  95. GRB 060219: Swift-BAT detection of a weak burst
  96. Brightening of the Optical Counterpart of the Possible GRB 060218
  97. GRB 060218: MDM Observations
  98. GRB 060218: Pre-burst detection of a possible host galaxy
  99. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  100. GRB 060218: Swift-BAT detection of a possible burst

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