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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"

26733 results found.

  1. GRB130702A: NOT observation - the detection of an emerging supernova
  2. GRB 130702A: Continued RATIR Optical and NIR Observations
  3. GRB 130702A: Continued UVOT Observations
  4. GRB 130702Ð
  5. GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy
  6. GRB 130702A: RATIR Optical and NIR Observations
  7. GRB 130702A: CARMA 3mm detection
  8. GRB 130702A: NOT optical observations
  9. GRB 130702A / Fermi394416326 : Nanshan optical observations
  10. Fermi GRB 130702A: Swift XRT and UVOT observations
  11. GRB 130702A / Fermi394416326: Fermi GBM detection
  12. GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst
  13. Fermi GBM trigger 394416326: MASTER early optical limit
  14. GRB 130628A: Fermi GBM detection
  15. Fermi394416326: FTN detection
  16. Fermi394416326: iPTF detection of a possible optical afterglow
  17. GRB 130623A: Second Swift-XRT observation
  18. GRB 130701A: MITSuME Akeno Optical observation
  19. GRB 130701B: Fermi GBM detection
  20. GRB 130701A: Swift-XRT refined Analysis
  21. GRB 130701A: Swift/UVOT Detection
  22. GRB 130701A: VLT/X-shooter redshift
  23. GRB 130701A: Enhanced Swift-XRT position
  24. GRB 130701A: optical afterglow from the NOT
  25. GRB 130701A: Swift detection of a burst
  26. GRB 130627B, Swift-BAT refined analysis
  27. GRB 130627A, Swift-BAT refined analysis
  28. GRB 130627B: Swift/UVOT Upper Limits
  29. GRB 130627A: Swift/UVOT Upper Limits
  30. GRB 130627A: Swift-XRT refined Analysis
  31. Swift trigger 559221 is likely a false trigger coincident with IGR J17544-2619
  32. GRB 130627A: Enhanced Swift-XRT position
  33. GRB 130626A: RATIR Optical Observations
  34. GRB 130627A: Fermi GBM detection
  35. GRB 130623A: Fermi GBM detection
  36. GRB 130627B: Swift-XRT observations
  37. GRB 130626A: Swift-XRT possible detection and UVOT upper limits
  38. GRB 130627A: Swift-XRT observations
  39. GRB 130626A: Swift detection of a short burst
  40. GRB 130625A: Swift-XRT refined Analysis
  41. GRB 130625A: Swift/UVOT Upper Limits
  42. GRB 130625A: Nanshan optical upper limit
  43. GRB 130623A: Swift-XRT and UVOT observations
  44. GRB 130625A: Enhanced Swift-XRT position
  45. GRB 130625A: Swift detection of a burst
  46. GRB 130623A detected in ground analysis of Swift-BAT data
  47. GRB 130614A: Suzaku WAM observation of the prompt emission
  48. Swift Trigger 558631 is not a real source
  49. GRB 130609B: Suzaku WAM observation of the prompt emission
  50. GRB 130612A: Continued Skynet/PROMPT/GORT/DSO observations
  51. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  52. Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
  53. GRB 130615A: Continued Skynet/PROMPT Observations
  54. GRB 130610A: TAROT La Silla observatory optical observations
  55. GRB 130610A: CrAO optical observations
  56. GRB 130615A: Zadko observatory - Gingin optical observations
  57. GRB 130615A: TAROT La Silla observatory optical observations
  58. GRB 130615A: Swift-XRT refined Analysis
  59. GRB 130614A: Fermi GBM detection
  60. GRB 130615A: Swift/UVOT Upper Limits
  61. GRB 130615A: Skynet/PROMPT Observations
  62. GRB 130615A: Enhanced Swift-XRT position
  63. GRB 130615A: GROND afterglow candidate
  64. GRB 130615A: Swift detection of a burst
  65. GRB 130612A: Fermi GBM observation
  66. GRB 130606B: Suzaku WAM observation of the prompt emission
  67. GRB 130612A: ISON-NM optical observations
  68. GRB 130612A: MITSuME Okayama upper limits
  69. GRB 130612A: Swift/UVOT Detection
  70. GRB 130612A: Swift-XRT refined Analysis
  71. GRB 130612A: Zadko observatory - Gingin optical observations
  72. GRB 130612A: Enhanced Swift-XRT position
  73. GRB 130612A: TAROT La Silla observatory optical observations
  74. GRB130612A OSN I-band observations
  75. GRB 130612A: RATIR Optical Observations
  76. GRB 130612A: P60 Observations
  77. GRB 130612A: Skynet/PROMPT detection of the optical afterglow
  78. GRB 130612A: PAIRITEL NIR Afterglow Observations
  79. GRB 130612A: Liverpool Telescope Afterglow detection
  80. GRB 130612A: Swift detection of a burst with an optical counterpart
  81. GRB 130609A: Swift/UVOT Upper Limits
  82. GRB 130608A: Swift/UVOT Upper Limits
  83. GRB 130609B: Fermi GBM observation
  84. GRB 130609B: GROND observations
  85. GRB 130606A: CrAO optical upper limit
  86. GRB 130608A: ISON-Kislovodsk optical upper limit
  87. GRB 130610A: ISON-NM optical observations
  88. GRB 130610A: Swift/UVOT Observations
  89. GRB 130610A: Fermi GBM Observation
  90. GRB 130609B: Swift/UVOT Observations
  91. GRB 130606B: Swift/UVOT Upper Limit
  92. GRB 130610A: LOAO BVR Observation
  93. GRB 130610A: Swift-XRT refined Analysis
  94. GRB 130609B: Swift-XRT refined Analysis
  95. GRB 130610A: Enhanced Swift-XRT position
  96. GRB 130608A: Further Swift-BAT analysis
  97. GRB 130609B: Enhanced Swift-XRT position
  98. GRB 130610A: PAIRITEL NIR Afterglow Observations
  99. GRB 130610A: Skynet/PROMPT detection of the optical afterglow
  100. GRB 130610A - Liverpool Telescope Optical Afterglow Confirmation

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