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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"

19664 results found.

  1. GRB 141031B: RATIR Optical and NIR Observation
  2. GRB 141031B: Swift/UVOT Upper Limits
  3. MAXI GRB 141029A is likely an X-ray flare from 1RXS J043657.1-161258
  4. GRB 141031B: Swift-XRT refined Analysis
  5. GRB 141031B: Bassano Bresciano Observatory upper limit
  6. GRB 141031B: Swift-BAT refined analysis
  7. GRB 141031A, Swift-BAT refined analysis
  8. GRB 141031B: Enhanced Swift-XRT position
  9. GRB 141031A: Swift/UVOT Upper Limits
  10. GRB 141031A: Swift-XRT refined Analysis
  11. GRB 141031A: Skynet PROMPT-CTIO Observations
  12. GRB 141031A: Fermi GBM detection
  13. GRB 141031B: MASTER early optical observations
  14. GRB 141031B: Swift detection of a burst
  15. GRB 141031A: Enhanced Swift-XRT position
  16. GRB 141031A: GROND detection of a possible optical afterglow candidate
  17. GRB 141031A: Swift detection of a burst
  18. GRB 140509A: GROND afterglow detection
  19. GRB 141028A: Swift/UVOT followup observations
  20. GRB 141028A: Swift-XRT observations
  21. GRB 141029A Tiled Swift observations
  22. GRB 141028A: Swift/UVOT Detection
  23. GRB 141028A: Swift/XRT detection of the X-ray afterglow
  24. GRB 141020A: Continued Mondy Observations, optical upper limit
  25. GRB 141026A: IRAM 30m millimetre observations
  26. GRB 141028A Tiled Swift observations
  27. GRB 141026A: Continued RATIR Optical and NIR Observations
  28. GRB 141028A: Fermi-LAT detection
  29. GRB 141026A: Skynet PROMPT-CTIO/Yerkes-41 Observations
  30. GRB 141026A: Swift/UVOT Upper Limits
  31. GRB 141026A: Swift-XRT refined Analysis
  32. GRB 141026A: Swift-BAT refined analysis
  33. GRB 141026A: MASTER early optical observations
  34. GRB 141026A: Enhanced Swift-XRT position
  35. GRB 141026A: GROND observations
  36. GRB 141026A: RATIR Optical Observations
  37. GRB 141026A: P60 early observations
  38. GRB 141026A: Swift detection of a burst
  39. GRB 141020A: AAO optical upper limit
  40. GRB 141020A: Khureltogot optical upper limit
  41. GRB141022A: Fermi GBM Detection
  42. GRB 141022A: Swift/UVOT Upper Limits
  43. GRB 141020A: Mondy optical observations
  44. GRB 141022A: Swift-BAT refined analysis
  45. GRB 141022A: Swift-XRT refined Analysis
  46. GRB141015A iTelescope observation
  47. GRB 141022A: GROND Detection of a possible Optical Afterglow Candidate
  48. GRB 141022A: Swift detection of a burst
  49. GRB 141004A: RATIR Late Time Optical and NIR Observations
  50. GRB 141020A: Swift-BAT refined analysis
  51. GRB 141020A: Swift-XRT refined Analysis
  52. GRB 141020A: 1.4 GHZ observation
  53. GRB 141020A: Swift/UVOT Detection
  54. GRB 141020A: Enhanced Swift-XRT position
  55. GRB 141020B: MAXI/GSC detection
  56. Konus-Wind observation of GRB 141017A
  57. GRB 141020A: Swift detection of a burst with an optical counterpart
  58. GRB 141017A, Swift-BAT refined analysis
  59. GRB 141017A: GROND Afterglow Confirmation
  60. GRB 141015A: Swift-XRT afterglow confirmation and refined Analysis
  61. GRB 141017A: Swift/UVOT Detection
  62. GRB 141017A: Swift-XRT refined Analysis
  63. GRB 141017A: Enhanced Swift-XRT position
  64. GRB 141017A: Zadko observatory - Gingin optical observations
  65. GRB 141017A: Swift detection of a burst
  66. GRB 141015A: Swift/UVOT Upper Limits
  67. GRB 141015A: Swift-BAT refined analysis
  68. GRB 141015A: RATIR Optical Upper Limits
  69. GRB 141015A: Enhanced Swift-XRT position
  70. GRB 141015A: Super-LOTIS early observations
  71. GRB 141015A: ISON-NM early optical observations
  72. GRB 141015A: Swift/XRT localization
  73. GRB 141015A: Swift detection of a burst
  74. IPN Triangulation of GRB 141011A (short/hard)
  75. Trigger 614903: Swift detection of IGR J17544-2619
  76. GRB 141005A: iTelescope.Net T21 Optical Observation
  77. GRB 141005A: Additional P60 imaging and afterglow confirmation
  78. GRB 141004A: Fermi GBM observation
  79. GRB 141004A: GROND observations
  80. GRB 141005A: GROND observations
  81. Konus-Wind observation of GRB 141005A
  82. GRB 141004A: Swift-XRT refined Analysis
  83. GRB 141005A: Swift-XRT refined Analysis
  84. GRB 141005A: Swift/UVOT Upper Limits
  85. GRB 141005A: Swift-BAT refined analysis
  86. GRB 141004A: Swift-BAT refined analysis
  87. GRB 141004A: Swift/UVOT Detection
  88. GRB 141005A: Fermi GBM Detection
  89. GRB 141005A: Enhanced Swift-XRT position
  90. GRB 141004A: RATIR Optical Observations
  91. GRB 141005A: P60 probable afterglow deteaction
  92. GRB 141004A: Enhanced Swift-XRT position
  93. GRB 141005A: Swift detection of a burst
  94. GRB 141004A: a long GRB detected by INTEGRAL
  95. GRB 141004A: Swift detection of a burst with an optical counterpart
  96. Swift observations of HD 305560
  97. GRB 140928A: Swift-XRT follow-up observations
  98. Swift possible detection of the Be star HD 305560
  99. GRB 140930B: Gemini South Spectroscopy
  100. GRB 140930B: GROND observations

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