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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"

36191 results found.

  1. GRB 100205A: GROND upper limits
  2. GRB 100206A: Swift-XRT refined analysis
  3. GRB 100206A: Fermi GBM observation
  4. GRB 100206A: Optical limit
  5. GRB 100206A: Swift-BAT refined analysis
  6. GRB 100206A: Enhanced Swift-XRT position
  7. GRB 100206A: Pre-explosion imaging and host candidate
  8. GRB 100206A: Swift detection of a short hard burst
  9. GRB 100205A: Gemini-N + NIRI photometry
  10. GRB 100130B: Fermi GBM detection
  11. GRB 100113A: Fermi GBM detection
  12. GRB 100205A: Swift-BAT refined analysis
  13. GRB 100205A: Swift UVOT upper limits
  14. GRB 100205A: Swift XRT refined analysis
  15. GRB 100203A: Swift XRT and UVOT refined analyses
  16. GRB 100205A: Enhanced Swift-XRT position
  17. GRB 100205A Gemini-North IR afterglow candidate
  18. GRB 100205A: Gemini-South Observations
  19. GRB 100205A: Super-LOTIS early observations
  20. GRB 100131A: Suzaku WAM observation of the prompt emission
  21. GRB 100205A: NOT optical observations
  22. GRB 100205A: Swift detection of a burst
  23. GRB 100203A Detected in Ground Analysis of BAT Data
  24. Short X-ray Transient detected by MAXI/GSC
  25. GRB 100131A: Fermi GBM detection
  26. GRB 100119A: Suzaku WAM observation of the prompt emission
  27. Konus-Wind observation of GRB 100119A
  28. GRB 100122A: Fermi GBM detection
  29. GRB 100122A: MASTER-Net optical observations
  30. GRB 100116A: Suzaku WAM observation of the prompt emission
  31. GRB 100115A: Swift-XRT refined analysis
  32. GRB 100119A: Swift-BAT refined analysis
  33. GRB091109A: VLT/FORS2 spectroscopic redshift
  34. GRB 100117A: candidate optical afterglow
  35. GRB 100119A: Swift detection of a burst
  36. Konus-Wind observation of GRB 100116A
  37. GRB 100117A: Gemini North spectroscopy
  38. GRB 100117A: Fermi GBM detection
  39. Swift/UVOT refined analysis of GRB100117A
  40. GRB 100117A: Optical object inside the revised XRT error circle
  41. GRB 100117A: Swift-XRT refined analysis
  42. GRB 100117A: Gemini-North upper limit
  43. GRB 100117A: Magellan IMACS imaging
  44. GRB 100117A: Gemini South Imaging and CFHT Pre-Explosion Images
  45. GRB 100117A: Swift-BAT refined analysis
  46. GRB 100117A: Swift detection of a short hard burst
  47. GRB 100115A: Gemini-N photometry
  48. GRB 100115A: Enhanced Swift-XRT position
  49. GRB 100116A: Fermi LAT detection
  50. GRB 100115A: SARA Astrometry
  51. GRB 100116A: Fermi GBM detection
  52. NOT observation of GRB100115A localization
  53. GRB 100115A: SARA Afterglow Candidate
  54. GRB 100115A: Swift/UVOT Upper Limits
  55. GRB 100115A: Swift-XRT candidate afterglow
  56. GRB 100115A detected in ground analysis of Swift-BAT data
  57. GRB 100111A: PAIRITEL NIR Upper Limits
  58. GRB 100111A: Swift UVOT Refined Analysis
  59. GRB 100111A: Swift-BAT refined analysis
  60. GRB 100111A: Enhanced Swift-XRT position
  61. GRB100111A: Swift-XRT refined analysis
  62. GRB 100111A: Fermi GBM observation
  63. GRB 100111A: NOT optical observations
  64. GRB 100111A: Swift detection of a burst with an optical afterglow
  65. GRB 100103A: GROND Upper Limits
  66. GRB 100103A: Swift-XRT team refined analysis
  67. GRB 100103A - UVOT-enhanced XRT position
  68. Konus-Wind observation of GRB 100103A
  69. GRB 100103A: Swift/UVOT Upper Limits
  70. GRB 100103A: Correction to Swift position error
  71. GRB 100103A: Swift/XRT position
  72. GRB 100103A: a long GRB detected with INTEGRAL
  73. Swift Trigger 381591 is probably not a burst
  74. GRB 091231: GROND NIR observations
  75. GRB 091230: Swift/UVOT Observations
  76. GRB 091230: Swift-XRT observation
  77. GRB 091230: GROND optical/NIR afterglow candidate
  78. GRB 091230: a long GRB detected by INTEGRAL
  79. Swift Trigger 381434 is not a GRB
  80. Trigger 381434: Swift detection of a possible burst
  81. GRB 091221 : IRSF NIR upper limit
  82. GRB 091221: Skynet/PROMPT Detections
  83. GRB 091221: Fermi GBM Observation
  84. GRB 091117: Swift-XRT late time observations
  85. GRB 091221 Swift-BAT refined analysis
  86. GRB 091221: Swift/UVOT refined analysis
  87. GRB 091221: Swift-XRT refined analysis
  88. GRB 091221: Enhanced Swift-XRT position
  89. GRB 091221, GROND observations
  90. GRB 091221: UVOT Confirmation of an Optical Afterglow
  91. GRB 091221: ROTSE-III Detection of Optical Counterpart
  92. GRB 091221: Swift detection of a burst
  93. Swift trigger 379449 (possible GRB) is not a burst
  94. GRB 091215: Faulkes Telescope North observations
  95. Trigger 379449: Swift detection of a possible burst
  96. GRB 091208B: Xinglong TNT optical observation
  97. GRB 091208A: Suzaku WAM observation of the prompt emission
  98. GRB 091208A: GAO 150cm telescope Optical Observation
  99. Konus-Wind observation of GRB 091208A
  100. GRB 091208B: GAO 150cm telescope Optical Observation

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