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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"

23561 results found.

  1. GRB 130215A: GMG optical observation
  2. GRB 130215A: Xinglong optical observations
  3. GRB 130215A: TAROT La Silla observatory optical observations
  4. GRB 130215A: RATIR Optical and NIR Observations
  5. GRB 130215A: REM NIR observations
  6. GRB 130215A: Redshift estimate
  7. Skynet Observations of GRB130215
  8. GRB 130215A: Swift detection of a burst
  9. Swift GRB130206A: late XRT observations.
  10. GRB 121128A: optical observations
  11. GRB 121123A: optical observations
  12. GRB 130211A: Swift/UVOT Upper Limits
  13. GRB 130211A: GROND detection of the afterglow
  14. GRB 130211A: Swift detection of a burst
  15. GRB 130131A: MITSuME Akeno Optical upper limits
  16. GRB 130131B: MITSuME Akeno Optical upper limits
  17. GRB 130122A: PTF P48 optical upper limits
  18. GRB 130206A: GROND Observations
  19. GRB 130206A: Fermi LAT Observations
  20. GRB 130206A: XRT and UVOT follow-up observations.
  21. GRB 130131B: optical upper limit in Mondy observatory
  22. GRB 130206A: Zadko observatory - Gingin optical observations
  23. Swift GRB 130206A - analysis of Swift/UVOT initial data.
  24. GRB 130206A: Swift-XRT observations
  25. GRB 130131A: optical observation in Mondy observatory
  26. GRB 130206A: Swift detection of a burst
  27. GRB 130131A: Swift/UVOT Upper Limits
  28. GRB 130131B: RATIR Upper Limits
  29. GRB 130131A: RATIR optical and infrared upper limits
  30. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval
  31. GRB 130131B: Swift-XRT refined Analysis
  32. GRB 130131A - UKIRT confirmation of afterglow
  33. GRB 130131B: VLT/X-shooter acquisition camera limits
  34. GRB 130131B: GROND Upper limits
  35. GRB 130131B: Swift/UVOT Upper Limits
  36. GRB 130131A: Swift-XRT refined Analysis
  37. GRB 130131B: MITSuME Okayama optical upper limits
  38. GRB 130131A: MITSuME Okayama optical upper limits
  39. GRB 130131B: Enhanced Swift-XRT position
  40. GRB 130131B: TAROT Calern observatory optical observations
  41. GRB 130131B: Zadko observatory - Gingin optical observations
  42. GRB 130131A: Enhanced Swift-XRT position
  43. GRB 130131B: Swift detection of a burst
  44. GRB 130131A - UKIRT afterglow candidate
  45. GRB 130131A: Swift detection of a burst
  46. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  47. GRB 130127A: Fermi GBM detection
  48. Swift Trigger 547142: MAXI/GSC upper limit
  49. GRB 130122A: RTT150 optical observations
  50. Swift Trigger 547142: a probable Galactic source
  51. GRB 130122A: CARMA 3mm Observations
  52. GRB 130122A: Swift/UVOT Detection
  53. GRB 130122A: optical observations
  54. GRB 130122A: RATIR Detection
  55. GRB 130122A: Swift-XRT refined Analysis
  56. GRB 130122A: Xinglong optical upper limit
  57. GRB 130122A: Enhanced Swift-XRT position
  58. GRB 130122A: T100 observations
  59. GRB 130122A: Swift detection of a burst with an optical counterpart
  60. Short GRB 121226A: TNG observation of the host galaxy
  61. GRB 130102B: MASTER synchronous observations
  62. GRB 130102A: Swift/UVOT Upper Limits
  63. Konus-Wind observation of GRB 130102B
  64. GRB 130102A: P60 Observations
  65. GRB 130102A: Enhanced Swift-XRT position
  66. GRB 130102A: Swift detection of a burst
  67. GRB 121226A: 5.8 GHz VLA observations
  68. GRB 121229A: Swift-XRT refined Analysis
  69. GRB 121229A: Swift/UVOT Upper Limits
  70. GRB 121229A: Enhanced Swift-XRT position
  71. GRB 121229A: VLT/X-shooter redshift
  72. Swift Trigger 544381 is unlikely to be a GRB
  73. GRB 121229A: GROND detection of the afterglow
  74. Skynet/PROMPT observations of GRB121229a
  75. GRB 121229A: Swift detection of a burst
  76. GRB 121226A: Swift/UVOT Upper Limits
  77. GRB 121226A: Swift-XRT refined Analysis
  78. GRB 121226A: NOT optical upper limit
  79. GRB 121226A: Optical Observations
  80. GRB 121226A: MITSuME Okayama Optical upper limits
  81. GRB 121226A: Zadko observatory - Gingin optical observations
  82. GRB 121226A: Swift detection of a burst
  83. IPN Triangulation of GRB 121225B
  84. GRB 121225B: Fermi GBM observation
  85. GRB 121225B: Fermi LAT Detection
  86. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  87. GRB 121217A theoretical estimate of redshift and of supernova occurrence
  88. GRB 121217A: Swift/UVOT Detection
  89. GRB 121217A: GROND Detection of the Afterglow
  90. GRB 121217A: Enhanced Swift-XRT position
  91. GRB 121217A: Swift detection of a burst
  92. GRB 121123A: NIKA (New IRAM KID Arrays) millimetre observations at the 30-m Pico Veleta telescope
  93. GRB 121209A: LOAO Observation
  94. GRB 121209A: Swift/UVOT Upper Limits
  95. GRB 121212A: LOAO IzY Observation
  96. GRB 121212A: PdBI mm observations
  97. GRB121212A: NOT optical imaging
  98. GRB 121209A: Early CARMA Observations
  99. GRB 121211A: Continued RATIR Optical and NIR Observations, Fading
  100. GRB 121212A: Maidanak optical observations

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