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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"

28258 results found.

  1. GRB 130627A: Swift-XRT observations
  2. GRB 130627A: Swift/UVOT Observation
  3. GRB 130627A: Swift detection of a burst
  4. Swift Trigger 559108 is not astrophysical
  5. GRB 130626A: Swift detection of a short burst
  6. GRB 130625A: Swift-XRT refined Analysis
  7. GRB 130625A: MASTER afterglow limit
  8. GRB 130625A: Swift/UVOT Upper Limits
  9. GRB 130625A: Nanshan optical upper limit
  10. GRB 130623A: Swift-XRT and UVOT observations
  11. GRB 130625A: Enhanced Swift-XRT position
  12. GRB 130625A: Swift detection of a burst
  13. GRB 130603B: First epoch of XMM-Newton observations
  14. GRB 130623A detected in ground analysis of Swift-BAT data
  15. Swift Trigger 558828 is not an interesting event
  16. Swift Trigger 558631 is not a real source
  17. GRB 130612A: Continued Skynet/PROMPT/GORT/DSO observations
  18. GRB 130603B: Analogy with GRB 090510A and possible connection with a supernova
  19. Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
  20. GRB 130615A: Continued Skynet/PROMPT Observations
  21. GRB 130610A: TAROT La Silla observatory optical observations
  22. GRB 130610A: CrAO optical observations
  23. GRB 130615A: Zadko observatory - Gingin optical observations
  24. GRB 130615A: TAROT La Silla observatory optical observations
  25. GRB 130615A: Swift-XRT refined Analysis
  26. GRB 130614A: Fermi GBM detection
  27. GRB 130615A: Swift/UVOT Upper Limits
  28. GRB 130615A: Skynet/PROMPT Observations
  29. GRB 130615A: Enhanced Swift-XRT position
  30. GRB 130615A: GROND afterglow candidate
  31. GRB 130615A: Swift detection of a burst
  32. GRB 130603B: Detection of possible afterglow/kilonova in HST observations
  33. GRB 130612A: iTelescope T21 optical observations
  34. GRB 130606B: Suzaku WAM observation of the prompt emission
  35. GRB 130610A: iTelescope T21 optical observations
  36. GRB 130612A: ISON-NM optical observations
  37. GRB 130612A: MITSuME Okayama upper limits
  38. GRB 130612A: Swift/UVOT Detection
  39. GRB 130612A: Swift-XRT refined Analysis
  40. GRB 130612A: Enhanced Swift-XRT position
  41. GRB 130612A: TAROT La Silla observatory optical observations
  42. GRB 130612A: VLT/X-shooter redshift
  43. GRB130612A OSN I-band observations
  44. GRB 130612A: RATIR Optical Observations
  45. GRB 130612A: P60 Observations
  46. GRB 130612A: NOT optical observations
  47. GRB 130612A: Skynet/PROMPT detection of the optical afterglow
  48. GRB 130612A: PAIRITEL NIR Afterglow Observations
  49. GRB 130612A: Liverpool Telescope Afterglow detection
  50. GRB 130612A: Swift detection of a burst with an optical counterpart
  51. GRB 130609A: Swift/UVOT Upper Limits
  52. GRB 130608A: Swift/UVOT Upper Limits
  53. GRB 130609B, Further Swift-BAT refined analysis
  54. GRB 130609B: GROND observations
  55. GMRT radio observation of GRB 130603B
  56. GRB 130606A: CrAO optical upper limit
  57. GRB 130609A: Radio Observations (5.8, 22 and 85 GHz)
  58. GRB 130609B, Swift-BAT refined analysis
  59. GRB 130608A: ISON-Kislovodsk optical upper limit
  60. GRB 130610A: ISON-NM optical observations
  61. GRB 130610A: Swift/UVOT Observations
  62. GRB 130609B: Swift/UVOT Observations
  63. GRB 130606B: Swift/UVOT Upper Limit
  64. GRB 130610A: LOAO BVR Observation
  65. GRB 130610A: Swift-XRT refined Analysis
  66. GRB 130609B: Swift-XRT refined Analysis
  67. GRB 130610A: Enhanced Swift-XRT position
  68. GRB 130609B: Enhanced Swift-XRT position
  69. GRB 130610A: P60 Observations
  70. GRB 130610A: PAIRITEL NIR Afterglow Observations
  71. GRB 130610A: Skynet/PROMPT detection of the optical afterglow
  72. GRB 130610A - Liverpool Telescope Optical Afterglow Confirmation
  73. GRB 130610A: Swift detection of a burst with an optical counterpart
  74. GRB 130609B: Swift detection of a burst with an optical counterpart
  75. GRB 130606A - Liverpool Telescope and Faulkes Telescope North optical observations
  76. GRB 130608A: Swift-XRT refined Analysis
  77. GRB 130609A: Swift-XRT refined Analysis
  78. GRB 130608A: RATIR Optical and NIR Observations
  79. GRB 130609A: Enhanced Swift-XRT position
  80. GRB 130608A: Enhanced Swift-XRT position
  81. GRB 130609A: RATIR Optical and NIR Observations
  82. GRB 130609A: P60 nondetection
  83. GRB130608A: BOOTES-2/TELMA upper limits
  84. GRB 130609A: Swift detection of a burst
  85. GRB 130608A: Swift detection of a burst
  86. GRB 130606A: Continued Skynet/PROMPT observations
  87. GRB 130606A: Continued RATIR Optical and NIR Monitoring
  88. GRB 130606B: RATIR Optical and NIR Observations
  89. Swift Trigger 557674 is a probable new Galactic transient
  90. GRB 130606B: Swift-XRT observations
  91. GRB 130606A: EVLA detection
  92. GRB 130606A: VLT/X-shooter redshift confirmation
  93. GRB 130606A: Skynet/PROMPT detection of the optical afterglow
  94. GRB 130606A: Swift/UVOT Upper Limits
  95. GRB 130603A: AAO optical observations
  96. GRB 130606A: Swift-XRT refined Analysis
  97. GRB 130606A: Enhanced Swift-XRT position
  98. GRB 130606A: GROND Detection of the Optical/NIR Afterglow
  99. GRB 130606A: AAO optical observations
  100. Trigger 557640: Swift detection of burst from SGR J1745-29

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