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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

43612 results found.

  1. GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy
  2. GRB 130702A: further Swift-XRT observations
  3. GRB 130702A: Continued P60 observations
  4. GRB 130702A: RATIR Optical and NIR Observations
  5. GRB 130702A: CARMA 3mm detection
  6. GRB 130702A: NOT optical observations
  7. GRB 130702A: TNG optical observations
  8. GRB 130702A / Fermi394416326 : Nanshan optical observations
  9. IPN localization of GRB 130702A (= Fermi 394416326)
  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 130627B: Swift afterglow confirmation
  18. Fermi GBM trigger 394325281 / 130630950 is not a GRB
  19. GRB 130623A: Second Swift-XRT observation
  20. GRB 130701B: Fermi GBM detection
  21. GRB 130701A: Swift-XRT refined Analysis
  22. GRB 130701A: P60 Observations
  23. GRB 130701A, Swift-BAT refined analysis
  24. Konus-Wind observation of GRB 130701A
  25. GRB 130701A: Swift/UVOT Detection
  26. GRB 130701A: VLT/X-shooter redshift
  27. GRB 130701A: Enhanced Swift-XRT position
  28. GRB 130701A: optical afterglow from the NOT
  29. GRB 130701A: Swift detection of a burst
  30. GRB 130627B, Swift-BAT refined analysis
  31. GRB 130627A, Swift-BAT refined analysis
  32. GRB 130627A: Swift-XRT refined Analysis
  33. GRB 130627B: Possible Swift-XRT afterglow detection
  34. Swift trigger 559221 is likely a false trigger coincident with IGR J17544-2619
  35. GRB 130627A: Enhanced Swift-XRT position
  36. GRB 130626A: KAIT Optical Observations
  37. GRB 130626A: RATIR Optical Observations
  38. GRB 130626A, Swift-BAT refined analysis
  39. GRB 130627A: Fermi GBM detection
  40. GRB 130623A: Fermi GBM detection
  41. GRB130627B: Swift/UVOT Observations
  42. GRB 130626A: Swift-XRT possible detection and UVOT upper limits
  43. GRB 130627B: Swift detection of a burst
  44. GRB 130627A: Swift-XRT observations
  45. GRB 130627A: Swift/UVOT Observation
  46. GRB 130627A: Swift detection of a burst
  47. Swift Trigger 559108 is not astrophysical
  48. GRB 130626A: Swift detection of a short burst
  49. GRB 130625A: Swift-XRT refined Analysis
  50. GRB 130625A: MASTER afterglow limit
  51. GRB 130625A: Nanshan optical upper limit
  52. GRB 130623A: Swift-XRT and UVOT observations
  53. GRB 130625A: Swift-BAT refined analysis
  54. GRB 130625A: Enhanced Swift-XRT position
  55. GRB 130625A: Swift detection of a burst
  56. GRB 130603B: First epoch of XMM-Newton observations
  57. GRB 130623A detected in ground analysis of Swift-BAT data
  58. Swift Trigger 558828 is not an interesting event
  59. Swift Trigger 558631: AAO optical observations
  60. GRB 130614A: Suzaku WAM observation of the prompt emission
  61. Swift Trigger 558631 is not a real source
  62. GRB 130612A: Swift-BAT refined analysis
  63. GRB 130609B: Suzaku WAM observation of the prompt emission
  64. GRB 130612A: Continued Skynet/PROMPT/GORT/DSO observations
  65. GRB 130603B: Analogy with GRB 090510A and possible connection with a supernova
  66. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  67. Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
  68. Swift Trigger 557910 is not astrophysical
  69. GRB 130615A: Continued Skynet/PROMPT Observations
  70. GRB 130610A: TAROT La Silla observatory optical observations
  71. GRB 130610A: CrAO optical observations
  72. GRB 130615A: Zadko observatory - Gingin optical observations
  73. GRB 130615A: TAROT La Silla observatory optical observations
  74. GRB 130615A: Swift-XRT refined Analysis
  75. GRB 130614A: Fermi GBM detection
  76. GRB 130615A: Skynet/PROMPT Observations
  77. GRB 130615A: Enhanced Swift-XRT position
  78. GRB 130615A: Swift-BAT refined analysis
  79. GRB 130615A: GROND afterglow candidate
  80. GRB 130615A: Swift detection of a burst
  81. GRB 130612A: Fermi GBM observation
  82. GRB 130603B: Detection of possible afterglow/kilonova in HST observations
  83. GRB 130612A: iTelescope T21 optical observations
  84. GRB 130603B: HST limits on an underlying supernova
  85. GRB 130606B: Suzaku WAM observation of the prompt emission
  86. GRB 130610A: iTelescope T21 optical observations
  87. GRB 130612A: ISON-NM optical observations
  88. GRB 130609B: Theoretical redshift estimation
  89. GRB 130612A: Swift/UVOT Detection
  90. GRB 130612A: Swift-XRT refined Analysis
  91. GRB 130612A: Zadko observatory - Gingin optical observations
  92. GRB 130612A: Enhanced Swift-XRT position
  93. GRB 130612A: TAROT La Silla observatory optical observations
  94. GRB 130612A: VLT/X-shooter redshift
  95. GRB130612A OSN I-band observations
  96. GRB 130612A: RATIR Optical Observations
  97. GRB 130612A: P60 Observations
  98. GRB 130612A: NOT optical observations
  99. GRB 130612A: Skynet/PROMPT detection of the optical afterglow
  100. GRB 130612A: PAIRITEL NIR Afterglow Observations

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