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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"

16211 results found.

  1. GRB 130831A: Maidanak optical observations
  2. GRB 130831A: optical observation in Chuguev AO
  3. GRB 130831A: ISON-Kislovodsk optical observations
  4. GRB 130907A: NOT redshift
  5. GRB 130831A: optical observation in Gissar AO
  6. GRB 130831A: ISON-UAFO optical observations
  7. GRB 130907A: MASTER early OT observations
  8. GRB 130907A: Swift detection of a burst with an optical counterpart
  9. Swift follow-up results of the possible weak INTEGRAL GRB
  10. GRB 130831A: RATIR Optical and NIR Upper Limits
  11. GRB 130903A: MASTER early optical limit
  12. GRB 130903A: Swift-XRT observations
  13. GRB 130903A: ISON-Kislovodsk optical Upper Limits
  14. GRB 130831A: Montarrenti Observatory optical follow-up
  15. GRB 130831A: Optical Observations via Virtual Telescope, follow-up
  16. GRB 130831A: RATIR Optical and NIR Observations
  17. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  18. GRB 130831A: VLA Observations
  19. GRB 130831B: Swift/UVOT Upper Limits
  20. GRB 130831A: THO optical observation
  21. GRB 130831A: optical observations
  22. GRB 130831A: Optical Observations via Virtual Telescope
  23. GRB 130831A: Montarrenti Observatory optical observations
  24. GRB 130831A : Xinglong 60cm optical observation
  25. GRB 130831A: MITSuME Akeno Optical observation
  26. GRB 130831A: Weihai optical observations
  27. GRB 130831A: Faulkes Telescope North and South optical afterglow
  28. GRB 130831A: Swift detection of a burst with an optical counterpart
  29. GRB 130822A: optical upper limits
  30. GRB 130829A: AAO optical observations
  31. GRB 130829A: NOT optical observations
  32. GRB 130821A: Weihai optical upper limit
  33. GRB 130822A: Swift/UVOT Upper Limits
  34. GRB 130822A: Weihai optical upper limit
  35. GRB 130816A: REM NIR candidate afterglow
  36. GRB 130812A: Swift/UVOT Upper Limits
  37. Correction to GCN Circ. 15086 "GRB130807A: Swift/UVOT observations"
  38. GRB130807A: Swift/UVOT observations
  39. GRB 130623A: GROND detection of the optical/NIR afterglow
  40. GRB 130806A: MITSuME Akeno Optical observation
  41. GRB 130806A: MITSuME Okayama upper limits
  42. GRB 130803A: RATIR Optical and NIR Observations
  43. GRB 130803A: Swift/UVOT Upper Limits
  44. GRB 130603B: Second epoch of HST WFC/F160W imaging
  45. GRB 130727A: Watcher optical limit
  46. GRB 130722A: RATIR Optical Observations
  47. GRB 130727A: Swift/UVOT Detection
  48. GRB 130727A: Faulkes Telescope South optical afterglow
  49. GRB130725B: REM-ROS2 optical observations
  50. GRB 130725A: Swift/UVOT Upper Limits
  51. GRB 130725A - Faulkes Telescope South Observations
  52. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  53. GRB 130725A: MITSuME Ishigakijima Optical Observation
  54. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  55. GRB 130722A: Swift/UVOT Detection
  56. GRB 130722A: MITSuME Okayama upper limits
  57. GRB 130722A: Skynet/GORT observations
  58. GRB 130722A: Faulkes Telescope South optical candidate
  59. GRB 130702A : Xinglong TNT continue optical observation
  60. GRB 130716A: Gemini-North imaging
  61. GRB 130716A: UVOT Upper Limits
  62. GRB 130702A: Maidanak optical observations
  63. GRB 130708A: Swift XRT and UVOT Observations
  64. GRB 130702A: TNG spectroscopic observations of the emerging supernova
  65. GRB 130702A: P200 Spectroscopic Confirmation of Associated Supernova
  66. GRB 130702A: Maidanak optical observations
  67. GRB130702A: NOT observation - the detection of an emerging supernova
  68. GRB 130702A: Continued RATIR Optical and NIR Observations
  69. GRB 130702A: Xinglong TNT optical observation
  70. GRB 130702A: Continued UVOT Observations
  71. GRB 130702A: VLA detection
  72. GRB 130702A (= Fermi 394416326): correction of the GCN #14988 title
  73. GRB 130702A: WSRT radio detection
  74. Konus-Wind observation of GRB 130702A
  75. GRB 130702A: further TNG observations
  76. GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy
  77. GRB 130702A: Continued P60 observations
  78. GRB 130702A: RATIR Optical and NIR Observations
  79. GRB 130702A: CARMA 3mm detection
  80. GRB 130702A: NOT optical observations
  81. GRB 130702A: TNG optical observations
  82. GRB 130702A / Fermi394416326 : Nanshan optical observations
  83. IPN localization of GRB 130702A (= Fermi 394416326)
  84. Fermi GRB 130702A: Swift XRT and UVOT observations
  85. GRB 130702A / Fermi394416326: Fermi GBM detection
  86. GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst
  87. Fermi GBM trigger 394416326: MASTER early optical limit
  88. Fermi394416326: FTN detection
  89. Fermi394416326: iPTF detection of a possible optical afterglow
  90. GRB 130701A: MITSuME Akeno Optical observation
  91. GRB 130701A: optical afterglow from the NOT
  92. GRB 130627B: Swift/UVOT Upper Limits
  93. GRB 130627A: Swift/UVOT Upper Limits
  94. GRB 130626A: KAIT Optical Observations
  95. GRB 130626A: RATIR Optical Observations
  96. GRB 130626A: Swift-XRT possible detection and UVOT upper limits
  97. GRB 130625A: MASTER afterglow limit
  98. GRB 130625A: Swift/UVOT Upper Limits
  99. GRB 130625A: Nanshan optical upper limit
  100. GRB 130603B: First epoch of XMM-Newton observations

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