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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"

28252 results found.

  1. IPN triangulation of GRB 130310A
  2. GRB 130310A: Fermi GBM detection
  3. GRB 130310A: Fermi-LAT detection and localization
  4. GRB 130305A BAT refined circular
  5. GRB 130305A: Further Swift-XRT Observations
  6. GRB 130305A: Optical Observations
  7. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  8. GRB 130305A: Gemini-North upper limit
  9. GRB 130307A: Fermi GBM detection
  10. GRB 130305A: Swift/UVOT Upper Limit
  11. GRB 130305A: RATIR Observations
  12. GRB 130306A: Swift detection of a burst
  13. GRB 130305A: P60 Observations
  14. GRB 100615A: HST host detection and X-shooter redshift
  15. GRB 130305A: Swift/XRT detection of the afterglow
  16. Konus-Wind observation of GRB 130305A
  17. GRB 130305A: Fermi LAT Detection
  18. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  19. GRB 130305A found in ground analysis of Swift/BAT data
  20. GRB 121128A: optical observations in Mondy observatory
  21. GRB 121128A: optical upper limit in Maidanak observatory
  22. Trigger 549841: Swift detection of SGR1806-20
  23. Konus-Wind observation of GRB 130219A
  24. GRB 130216A: Swift/XRT observations
  25. GRB 130215A: PTF P48 optical detection
  26. GRB 130219A: Fermi GBM detection
  27. GRB 130216B: Swift/XRT observations
  28. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  29. GRB 130216A: possible early detection at 15 GHz
  30. GRB 130216B BAT refined analysis
  31. GRB 130215A: Additional P200 NIR observations
  32. GRB 120118B: host observations and redshift determination
  33. GRB 130216A: OSN I-band observations
  34. GRB 130216A: Swift detection of a burst
  35. GRB 130215A: P200 NIR observations
  36. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  37. GRB 130215A: MITSuME Okayama Optical Observation
  38. GRB 130215A: Fermi GBM detection
  39. GRB 130215A: GMG optical observation
  40. GRB 130215A: iTelescope T11 observations
  41. GRB 130215A: Xinglong optical observations
  42. GRB 130215A: TAROT La Silla observatory optical observations
  43. GRB 130215A: CARMA 3mm detection
  44. GRB 130215: ROTSE-III Detection of Optical Counterpart
  45. GRB 130215A: Swift detection of a burst
  46. Swift GRB130206A: late XRT observations.
  47. GRB 130131B: CTIO 0.9-m optical upper-limits
  48. GRB 121128A: optical observations
  49. GRB 121123A: optical observations
  50. GRB 130211A: Swift/UVOT Upper Limits
  51. GRB 130211A: Swift-XRT refined Analysis
  52. GRB 130211A: GROND detection of the afterglow
  53. GRB 130211A: Swift detection of a burst
  54. GRB 130131A: MITSuME Akeno Optical upper limits
  55. GRB 130131B: MITSuME Akeno Optical upper limits
  56. GRB 130206A: GROND Observations
  57. GRB 130206A: Fermi LAT Observations
  58. GRB 130206A: XRT and UVOT follow-up observations.
  59. GRB 130131B: optical upper limit in Mondy observatory
  60. GRB 130206A: Swift-XRT observations
  61. GRB 130131A: optical observation in Mondy observatory
  62. GRB 130206A: Swift detection of a burst
  63. GRB 130131A: Swift/UVOT Upper Limits
  64. GRB 130131B: RATIR Upper Limits
  65. GRB 130131A: RATIR optical and infrared upper limits
  66. GRB 130131B: Swift-XRT refined Analysis
  67. GRB 130131A - UKIRT confirmation of afterglow
  68. GRB 130131B: VLT/X-shooter acquisition camera limits
  69. GRB 130131B: GROND Upper limits
  70. GRB 130131A: CARMA 3mm Observations
  71. GRB 130131A: VLA 5.8 Ghz Detection
  72. GRB 130131B: IAC80 I-band observations
  73. GRB 130131B: Swift/UVOT Upper Limits
  74. GRB 130131A: Swift-XRT refined Analysis
  75. GRB 130131B: MITSuME Okayama optical upper limits
  76. GRB 130131A: MITSuME Okayama optical upper limits
  77. GRB 130131B: Enhanced Swift-XRT position
  78. GRB 130131B: TAROT Calern observatory optical observations
  79. GRB 130131B: Zadko observatory - Gingin optical observations
  80. GRB 130131A: Enhanced Swift-XRT position
  81. GRB 130131B: Swift detection of a burst
  82. GRB 130131A - Faulkes Telescope North Observations
  83. GRB 130131A - UKIRT afterglow candidate
  84. GRB 130131A: Swift detection of a burst
  85. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  86. GRB 130127A: Fermi GBM detection
  87. GRB 130122A: RTT150 optical observations
  88. Swift Trigger 547142: a probable Galactic source
  89. GRB 130122A: Swift/UVOT Detection
  90. GRB 130122A: optical observations
  91. GRB 130122A: RATIR Detection
  92. GRB 130122A: Swift-XRT refined Analysis
  93. GRB 130122A: Xinglong optical upper limit
  94. GRB 130122A: Enhanced Swift-XRT position
  95. GRB 130122A: MASTER-Net early marginal detection of the OT
  96. GRB 130122A: T100 observations
  97. GRB 130122A: Swift detection of a burst with an optical counterpart
  98. Short GRB 121226A: TNG observation of the host galaxy
  99. GRB 130102A: Swift/UVOT Upper Limits
  100. GRB 130102A: P60 Observations

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