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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"

19708 results found.

  1. GRB 130722A: Swift/UVOT Detection
  2. GRB 130722A: MITSuME Okayama upper limits
  3. GRB 130722A: Enhanced Swift-XRT position
  4. GRB 130722A: Skynet/GORT observations
  5. GRB 130722A: Swift detection of a burst
  6. GRB 130716A: Gemini-North imaging
  7. GRB 130716A: UVOT Upper Limits
  8. GRB 130716A: Probable short-hard burst with delayed Swift data
  9. GRB 130626A: Retraction of possible X-ray afterglow
  10. GRB 130708A: Swift XRT and UVOT Observations
  11. GRB 130702A: TNG spectroscopic observations of the emerging supernova
  12. GRB 130708A: Fermi GBM observation
  13. GRB 130702A: P200 Spectroscopic Confirmation of Associated Supernova
  14. GRB130702A: NOT observation - the detection of an emerging supernova
  15. GRB 130702A: Continued RATIR Optical and NIR Observations
  16. GRB 130702A: Continued UVOT Observations
  17. GRB 130702Ð
  18. GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy
  19. GRB 130702A: RATIR Optical and NIR Observations
  20. GRB 130702A: NOT optical observations
  21. GRB 130702A / Fermi394416326 : Nanshan optical observations
  22. Fermi GRB 130702A: Swift XRT and UVOT observations
  23. GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst
  24. Fermi GBM trigger 394416326: MASTER early optical limit
  25. Fermi394416326: FTN detection
  26. Fermi394416326: iPTF detection of a possible optical afterglow
  27. GRB 130623A: Second Swift-XRT observation
  28. GRB 130701A: MITSuME Akeno Optical observation
  29. GRB 130701A: Swift/UVOT Detection
  30. GRB 130701A: Enhanced Swift-XRT position
  31. GRB 130701A: optical afterglow from the NOT
  32. GRB 130701A: Swift detection of a burst
  33. GRB 130627B: Swift/UVOT Upper Limits
  34. GRB 130627A: Swift/UVOT Upper Limits
  35. Swift trigger 559221 is likely a false trigger coincident with IGR J17544-2619
  36. GRB 130627A: Enhanced Swift-XRT position
  37. GRB 130626A: RATIR Optical Observations
  38. GRB130627B: Swift/UVOT Observations
  39. GRB 130627B: Swift-XRT observations
  40. GRB 130626A: Swift-XRT possible detection and UVOT upper limits
  41. GRB 130627A: Swift-XRT observations
  42. GRB 130627A: Swift/UVOT Observation
  43. GRB 130626A: Swift detection of a short burst
  44. GRB 130625A: Swift/UVOT Upper Limits
  45. GRB 130625A: Nanshan optical upper limit
  46. GRB 130623A: Swift-XRT and UVOT observations
  47. GRB 130625A: Enhanced Swift-XRT position
  48. GRB 130625A: Swift detection of a burst
  49. GRB 130603B: First epoch of XMM-Newton observations
  50. Swift Trigger 558631 is not a real source
  51. GRB 130612A: Continued Skynet/PROMPT/GORT/DSO observations
  52. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  53. Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
  54. GRB 130615A: Continued Skynet/PROMPT Observations
  55. GRB 130610A: TAROT La Silla observatory optical observations
  56. GRB 130610A: CrAO optical observations
  57. GRB 130615A: Zadko observatory - Gingin optical observations
  58. GRB 130615A: TAROT La Silla observatory optical observations
  59. GRB 130615A: Swift/UVOT Upper Limits
  60. GRB 130615A: Skynet/PROMPT Observations
  61. GRB 130615A: Enhanced Swift-XRT position
  62. GRB 130615A: GROND afterglow candidate
  63. GRB 130615A: Swift detection of a burst
  64. GRB 130612A: ISON-NM optical observations
  65. GRB 130612A: MITSuME Okayama upper limits
  66. GRB 130612A: Swift/UVOT Detection
  67. GRB 130612A: Zadko observatory - Gingin optical observations
  68. GRB 130612A: Enhanced Swift-XRT position
  69. GRB 130612A: TAROT La Silla observatory optical observations
  70. GRB130612A OSN I-band observations
  71. GRB 130612A: RATIR Optical Observations
  72. GRB 130612A: P60 Observations
  73. GRB 130612A: Skynet/PROMPT detection of the optical afterglow
  74. GRB 130612A: PAIRITEL NIR Afterglow Observations
  75. GRB 130612A: Swift detection of a burst with an optical counterpart
  76. GRB 130609A: Swift/UVOT Upper Limits
  77. GRB 130608A: Swift/UVOT Upper Limits
  78. GRB 130609B: GROND observations
  79. GRB 130606A: CrAO optical upper limit
  80. GRB 130608A: ISON-Kislovodsk optical upper limit
  81. GRB 130610A: ISON-NM optical observations
  82. GRB 130610A: Swift/UVOT Observations
  83. GRB 130609B: Swift/UVOT Observations
  84. GRB 130606B: Swift/UVOT Upper Limit
  85. GRB 130610A: LOAO BVR Observation
  86. GRB 130610A: Enhanced Swift-XRT position
  87. GRB 130608A: Further Swift-BAT analysis
  88. GRB 130609B: Enhanced Swift-XRT position
  89. GRB 130610A: PAIRITEL NIR Afterglow Observations
  90. GRB 130610A: Skynet/PROMPT detection of the optical afterglow
  91. GRB 130610A: Swift detection of a burst with an optical counterpart
  92. GRB 130609B: Swift detection of a burst with an optical counterpart
  93. GRB 130609A: Fermi GBM observation
  94. GRB 130609A: Swift-XRT refined Analysis
  95. GRB 130608A: RATIR Optical and NIR Observations
  96. GRB 130609A: Enhanced Swift-XRT position
  97. GRB 130608A: Enhanced Swift-XRT position
  98. GRB 130609A: RATIR Optical and NIR Observations
  99. GRB130608A: BOOTES-2/TELMA upper limits
  100. GRB 130609A: Swift detection of a burst

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