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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"

42517 results found.

  1. GRB 130131A - UKIRT confirmation of afterglow
  2. GRB 130131B: VLT/X-shooter acquisition camera limits
  3. GRB 130131B: GROND Upper limits
  4. GRB 130131A: CARMA 3mm Observations
  5. GRB 130131A: VLA 5.8 Ghz Detection
  6. GRB 130131B: IAC80 I-band observations
  7. GRB 130131B: Swift/UVOT Upper Limits
  8. GRB 130131A: Swift-XRT refined Analysis
  9. GRB 130131B: MITSuME Okayama optical upper limits
  10. GRB 130131A: MITSuME Okayama optical upper limits
  11. GRB 130131B: Enhanced Swift-XRT position
  12. GRB 130131B: Swift-BAT refined analysis
  13. GRB 130131A: Swift-BAT refined analysis
  14. GRB 130131B: TAROT Calern observatory optical observations
  15. GRB 130131B: Zadko observatory - Gingin optical observations
  16. GRB 130131A: Enhanced Swift-XRT position
  17. GRB 130131B: Swift detection of a burst
  18. GRB 130131A - Faulkes Telescope North Observations
  19. GRB 130131A - UKIRT afterglow candidate
  20. GRB 130131A: Swift detection of a burst
  21. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  22. GRB 130127A: Fermi GBM detection
  23. GRB 130122A: RTT150 optical observations
  24. Swift Trigger 547142: a probable Galactic source
  25. GRB 130122A: CARMA 3mm Observations
  26. GRB 130122A: Swift/UVOT Detection
  27. GRB 130122A: optical observations
  28. GRB 130122A: RATIR Detection
  29. GRB 130122A: Swift-BAT refined analysis
  30. GRB 130122A: Swift-XRT refined Analysis
  31. GRB 130122A: Xinglong optical upper limit
  32. GRB 130122A: Enhanced Swift-XRT position
  33. GRB 130122A: MASTER-Net early marginal detection of the OT
  34. GRB 130122A: T100 observations
  35. GRB 130122A: Swift detection of a burst with an optical counterpart
  36. Short GRB 121226A: TNG observation of the host galaxy
  37. GRB 121225B: Suzaku WAM observation of the prompt emission
  38. GRB 130102B: MASTER synchronous observations
  39. GRB 130102A: Swift/UVOT Upper Limits
  40. Konus-Wind observation of GRB 130102B
  41. GRB 130102A: P60 Observations
  42. GRB 130102A: Swift-BAT refined analysis
  43. GRB 130102A: MASTER-Net optical observations
  44. GRB 130102A: Swift-XRT refined Analysis
  45. GRB 130102B: MAXI/GSC detection
  46. GRB 130102A: Enhanced Swift-XRT position
  47. GRB 130102A: IAC80 I-band observations
  48. GRB 130102A: Swift detection of a burst
  49. GRB 121226A: 5.8 GHz VLA observations
  50. GRB 121229A: Swift-XRT refined Analysis
  51. GRB 121229A, Swift-BAT refined analysis
  52. GRB 121229A: Swift/UVOT Upper Limits
  53. GRB 121229A: Enhanced Swift-XRT position
  54. GRB 121229A: VLT/X-shooter redshift
  55. Swift Trigger 544381 is unlikely to be a GRB
  56. GRB 121229A: MAXI/GSC detection
  57. GRB 121229A: GROND detection of the afterglow
  58. Skynet/PROMPT observations of GRB121229a
  59. GRB 121229A: Swift detection of a burst
  60. GRB 121226A: 10.4m GTC optical observations
  61. GRB 121226A: Swift/UVOT Upper Limits
  62. GRB 121226A: Swift-XRT refined Analysis
  63. GRB 121226A, Swift-BAT refined analysis
  64. GRB 121226A: NOT optical upper limit
  65. GRB 121226A: Optical Observations
  66. GRB 121226A: MITSuME Okayama Optical upper limits
  67. GRB 121226A: Zadko observatory - Gingin optical observations
  68. GRB 121226A: BOOTES-4/MET optical observations
  69. GRB 121226A: Swift detection of a burst
  70. Konus-Wind observation of GRB 121225B
  71. GRB 121225B: Fermi GBM observation
  72. GRB 121225B: Fermi LAT Detection
  73. GRB 121225A: MAXI/GSC detection
  74. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  75. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  76. GRB 121217A: ATCA 44GHz upper limit
  77. GRB 121217A: Swift-BAT refined analysis
  78. GRB 121217A theoretical estimate of redshift and of supernova occurrence
  79. GRB 121217A: Fermi GBM observation
  80. GRB 121217A: Swift-XRT refined Analysis
  81. GRB 121217A: Swift/UVOT Detection
  82. GRB 121217A: GROND Detection of the Afterglow
  83. GRB 121217A: Enhanced Swift-XRT position
  84. GRB 121217A: Swift detection of a burst
  85. GRB 121123A: NIKA (New IRAM KID Arrays) millimetre observations at the 30-m Pico Veleta telescope
  86. GRB 121209A: LOAO Observation
  87. GRB 121209A: Swift/UVOT Upper Limits
  88. GRB 121212A: LOAO IzY Observation
  89. GRB 121209A: MAXI/GSC detection
  90. GRB 121212A: PdBI mm observations
  91. GRB121212A: NOT optical imaging
  92. GRB 121209A: Early CARMA Observations
  93. GRB 121211A: Continued RATIR Optical and NIR Observations, Fading
  94. GRB 121212A: Maidanak optical observations
  95. GRB 121211A: Fermi GBM observation
  96. GRB 121211A: RATIR Optical and NIR Observations
  97. GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
  98. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  99. GRB 121212A: PAIRITEL NIR Observations
  100. GRB 121212A: Swift-XRT refined Analysis

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