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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"

28301 results found.

  1. GRB 100116A: Suzaku WAM observation of the prompt emission
  2. GRB 100115A: Swift-XRT refined analysis
  3. GRB 100119A: Swift-BAT refined analysis
  4. Swift/UVOT refined analysis of GRB100117A
  5. GRB 100117A: Swift-XRT refined analysis
  6. GRB 100117A: Gemini-North upper limit
  7. GRB 100117A: Magellan IMACS imaging
  8. GRB 100117A: Gemini South Imaging and CFHT Pre-Explosion Images
  9. GRB 100117A: Swift-BAT refined analysis
  10. GRB100117A: Possible afterglow from NOT observation
  11. GRB 100117A: Swift detection of a short hard burst
  12. GRB 100115A: Gemini-N photometry
  13. GRB 100115A: Enhanced Swift-XRT position
  14. GRB 100116A: Fermi LAT detection
  15. GRB 100115A: SARA Astrometry
  16. GRB 100116A: Fermi GBM detection
  17. GRB 100115A: SARA Afterglow Candidate
  18. GRB 100115A: Swift/UVOT Upper Limits
  19. GRB 100115A: Swift-XRT candidate afterglow
  20. GRB 100111A: PAIRITEL NIR Upper Limits
  21. GRB 100111A: Swift UVOT Refined Analysis
  22. GRB 100111A: Swift-BAT refined analysis
  23. GRB 100111A: Enhanced Swift-XRT position
  24. GRB100111A: Swift-XRT refined analysis
  25. GRB 100111A: Fermi GBM observation
  26. GRB 100111A: NOT optical observations
  27. GRB 100111A: Swift detection of a burst with an optical afterglow
  28. Swift/BAT Detects an Outburst from XTE J1901+014
  29. GRB 100103A: GROND Upper Limits
  30. GRB 100103A: Swift-XRT team refined analysis
  31. GRB 100103A - UVOT-enhanced XRT position
  32. GRB 100103A: Swift/XRT position
  33. GRB 100103A: a long GRB detected with INTEGRAL
  34. Swift Trigger 381591 is probably not a burst
  35. GRB 091231: GROND NIR observations
  36. Swift Trigger 381591: Uncatalogued UVOT Source
  37. GRB 091230: Swift/UVOT Observations
  38. Trigger 381591: Swift detection of a possible burst
  39. GRB 091230: Swift-XRT observation
  40. GRB 091230: GROND optical/NIR afterglow candidate
  41. Swift Trigger 381434 is not a GRB
  42. Trigger 381434: Swift detection of a possible burst
  43. GRB 091221: Skynet/PROMPT Detections
  44. GRB 091221: Fermi GBM Observation
  45. GRB 091117: Swift-XRT late time observations
  46. GRB 091221 Swift-BAT refined analysis
  47. GRB 091221: Swift/UVOT refined analysis
  48. GRB 091221: Swift-XRT refined analysis
  49. GRB 091221: Enhanced Swift-XRT position
  50. GRB 091221: UVOT Confirmation of an Optical Afterglow
  51. GRB 091221: ROTSE-III Detection of Optical Counterpart
  52. GRB 091221: Swift detection of a burst
  53. Swift trigger 379449 (possible GRB) is not a burst
  54. GRB 091215: Faulkes Telescope North observations
  55. Trigger 379449: Swift detection of a possible burst
  56. GRB 091208A: Suzaku WAM observation of the prompt emission
  57. GRB 091208A: GAO 150cm telescope Optical Observation
  58. GRB091208A: Swift/UVOT refined analysis
  59. GRB 091208B: optical observations
  60. GRB 091208B: GROND observations
  61. GRB 091208A: Swift-XRT observations
  62. GRB091208B: NOT optical observations
  63. GRB 091208B: Swift-XRT refined analysis
  64. GRB 091208B, Swift-BAT refined analysis
  65. GRB 091208A Swift-BAT refined analysis
  66. GRB 091208A, RIMOTS optical upper limits
  67. GRB 091208B: MITSuME Akeno Optical Observation
  68. GRB 091208B: Enhanced Swift-XRT position
  69. GRB 091208B: MITSuME Okayama Optical Observation
  70. GRB 091208B, RIMOTS optical upper limits
  71. GRB 091208B: Swift detection of a burst with an optical afterglow
  72. GRB 091208B: BOOTES-3 optical afterglow
  73. Short X-ray Transient, RIMOTS optical upper limits
  74. GRB 091123: Suzaku WAM observation of the prompt emission
  75. GRB 091202: GTC & CAHA optical/nIR afterglow candidate
  76. GRB 091109A: GROND confirmation of redshift z = 3.5
  77. GRB 091127, SMARTS optical/IR afterglow observations
  78. GRB091202: Swift-XRT refined analysis
  79. GRB 091202: Swift/UVOT Upper Limits
  80. GRB 091202: Optical and NIR observations
  81. GRB 091202 - UVOT-enhanced XRT position
  82. GRB 091127: Zadko Telescope Observations
  83. GRB 091126A: Suzaku WAM observation of the prompt emission
  84. GRB 091202: TAROT Calern observatory optical observations
  85. GRB 091117: Chandra Observations
  86. Konus-Wind observation of very long GRB 091123
  87. GRB 091123: Fermi GBM detection of a very long burst
  88. GRB 091126B: Fermi GBM detection
  89. GRB 091127: Suzaku WAM observation of the prompt emission
  90. GRB 091126: Fermi GBM detection
  91. GRB 091130B: Swift-XRT team refined analysis
  92. GRB 091130B: Swift-BAT refined analysis
  93. GRB 091130B: Swift/UVOT Upper Limits
  94. GRB 091127: Skynet/PROMPT Observations of Fading
  95. GRB 091130B: Enhanced Swift-XRT position
  96. Swift trigger 377436 (possible GRB 091130A) is not a burst
  97. GRB 091130B: Swift detection of a burst
  98. GRB 091127: Radio observations
  99. GRB 091128: Fermi GBM detection
  100. GRB 091127: TAROT La Silla observatory optical observations

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