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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"

43000 results found.

  1. GRB 100213B: PAIRITEL NIR Upper Limits
  2. GRB 100213A: Enhanced Swift-XRT position
  3. GRB 100213B: Swift-BAT refined analysis
  4. GRB 100213A: SARA observations
  5. GRB 100213B: NOT optical observations
  6. GRB 100213B: Swift detection of a burst
  7. GRB 100213A: Swift detection of a burst
  8. GRB 100206A: Second epoch Gemini-north observations and afterglow limits
  9. Swift/UVOT observations of GRB120212A
  10. GRB 100212A: LOAO R-band Detection/V-band Observation
  11. GRB 100212A: Fermi GBM detection
  12. GRB 100212A: Swift-BAT refined analysis
  13. GRB 100212A: Enhanced Swift-XRT position
  14. GRB 100212A: candidate optical afterglow
  15. GRB 100212A: Swift detection of a burst
  16. GRB 091127: Detection of a Supernova
  17. GRB 100205A: Keck limits on an underlying host galaxy
  18. GRB 100205A: BOAO/LOAO zYJK observation
  19. GRB 100205B: Fermi GBM detection
  20. GRB 100206A: GROND upper limits
  21. GRB 100206A: Gemini-North observations
  22. GRB 100206A: Swift/UVOT Upper Limits
  23. GRB 100131A: MASTER-Net optical alert observations
  24. GRB 100206A: YNAO-GMG observations
  25. GRB 100206A: MASTER-Net optical alert observations
  26. GRB 100206A: PAIRITEL Photometry of Host Candidate
  27. GRB 100206A - Keck/LRIS Spectroscopy
  28. GRB100206: MITSuME optical upper limits
  29. GRB 100206A: NOT NIR observations
  30. GRB 100206A: WHT candidate afterglow
  31. GRB 100206A: optical observations from Southern Spain
  32. GRB 100205A: GROND upper limits
  33. GRB 100206A: Swift-XRT refined analysis
  34. GRB 100206A: Fermi GBM observation
  35. GRB 100206A: Optical limit
  36. GRB 100206A: Swift-BAT refined analysis
  37. GRB 100206A: Enhanced Swift-XRT position
  38. GRB 100206A: Pre-explosion imaging and host candidate
  39. GRB 100206A: Swift detection of a short hard burst
  40. GRB 100205A: Gemini-N + NIRI photometry
  41. GRB 100130B: Fermi GBM detection
  42. GRB 100113A: Fermi GBM detection
  43. GRB 100205A: Swift-BAT refined analysis
  44. GRB 100205A: Swift UVOT upper limits
  45. GRB 100205A: Swift XRT refined analysis
  46. GRB 100203A: Swift XRT and UVOT refined analyses
  47. GRB 100205A: Enhanced Swift-XRT position
  48. GRB 100205A Gemini-North IR afterglow candidate
  49. GRB 100205A: Super-LOTIS early observations
  50. GRB 100131A: Suzaku WAM observation of the prompt emission
  51. GRB 100205A: NOT optical observations
  52. GRB 100205A: Swift detection of a burst
  53. GRB 100203A Detected in Ground Analysis of BAT Data
  54. Short X-ray Transient detected by MAXI/GSC
  55. GRB 100131A: Fermi GBM detection
  56. GRB 100119A: Suzaku WAM observation of the prompt emission
  57. Konus-Wind observation of GRB 100119A
  58. GRB 100122A: Fermi GBM detection
  59. GRB 100122A: MASTER-Net optical observations
  60. GRB 100116A: Suzaku WAM observation of the prompt emission
  61. GRB 100119A: Swift-BAT refined analysis
  62. GRB091109A: VLT/FORS2 spectroscopic redshift
  63. GRB 100119A: Swift detection of a burst
  64. Konus-Wind observation of GRB 100116A
  65. GRB 100117A: Gemini North spectroscopy
  66. GRB 100117A: Fermi GBM detection
  67. GRB 100117A: Optical object inside the revised XRT error circle
  68. GRB 100117A: Swift-XRT refined analysis
  69. GRB 100117A: Gemini-North upper limit
  70. GRB 100117A: Magellan IMACS imaging
  71. GRB 100117A: Gemini South Imaging and CFHT Pre-Explosion Images
  72. GRB 100117A: Swift-BAT refined analysis
  73. GRB100117A: Possible afterglow from NOT observation
  74. GRB 100117A: Swift detection of a short hard burst
  75. GRB 100115A: Gemini-N photometry
  76. GRB 100115A: Enhanced Swift-XRT position
  77. GRB 100116A: Fermi LAT detection
  78. GRB 100115A: SARA Astrometry
  79. GRB100115A: Revision of NOT observation
  80. GRB 100116A: Fermi GBM detection
  81. NOT observation of GRB100115A localization
  82. GRB 100115A: SARA Afterglow Candidate
  83. GRB 100111A: PAIRITEL NIR Upper Limits
  84. GRB 100111A: Swift UVOT Refined Analysis
  85. GRB 100111A: Swift-BAT refined analysis
  86. GRB 100111A: Enhanced Swift-XRT position
  87. GRB 100111A: Fermi GBM observation
  88. GRB 100111A: Swift detection of a burst with an optical afterglow
  89. Swift/BAT Detects an Outburst from XTE J1901+014
  90. Swift Trigger #382159 is due to XTE J1752-223
  91. GRB 100103A: GROND Upper Limits
  92. GRB 100103A: Swift-XRT team refined analysis
  93. GRB 100103A - UVOT-enhanced XRT position
  94. Konus-Wind observation of GRB 100103A
  95. GRB 100103A: Swift/UVOT Upper Limits
  96. GRB 100103A: Correction to Swift position error
  97. GRB 100103A: Swift/XRT position
  98. GRB 100103A: a long GRB detected with INTEGRAL
  99. Swift Trigger 381591: Retraction of Reported UVOT Source
  100. Swift Trigger 381591 is probably not a burst

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