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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"

3037 results found.

  1. GRB 140129B: Swift detection of a burst with an optical afterglow
  2. Fermi412093190: iPTF optical counterpart search
  3. GRB 140103A: AAO optical afterglow candidate
  4. GRB 140108A: MASTER-Net OT detection
  5. GRB 140105A/Fermi410578384: MASTER-Net early optical observations
  6. GRB140104A : Xinglong TNT observation. A bright star is located nearby
  7. GRB 140102A: Fermi/GBM Observation
  8. GRB 140102A: MAXI/GSC detection
  9. GRB 140102A: Swift-XRT refined Analysis
  10. GRB 140102A: Fermi-LAT detection of a burst
  11. Konus-Wind observation of GRB 131226A
  12. GRB 131227A: OT candidate from KAIT Optical observations
  13. GRB 131225A: MASTER-Net optical observations
  14. GRB 131226A: Swift detection of a burst
  15. GRB 131125A: iPTF upper limits on the afterglow of a short GRB
  16. GRB 131128A: AROMA-N Optical Observation
  17. IPN Triangulation of GRB 131118A
  18. GRB 131030A, Optical Observations
  19. GRB 130925A: HST imaging
  20. GRB 131031A: MASTER optical observation
  21. GRB 131018A: KAIT Optical Upper Limit
  22. GRB 131018A: Swift detection of a burst
  23. GRB 131011A: Fermi GBM detection
  24. GRB 130925A: Swift-XRT refined Analysis
  25. GRB 130925A: MAXI/GSC detection
  26. GRB 130907A: Maidanak optical observations
  27. GRB 130907A: MASTER refined analysis
  28. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  29. GRB 130912A: REM optical/NIR upper limits
  30. GRB 130831A: Maidanak optical observations
  31. GRB 130831A: ISON-Kislovodsk optical observations
  32. GRB 130831A: optical observation in Gissar AO
  33. GRB 130903A: Fermi GBM observation
  34. GRB 130903A: A long GRB detected by INTEGRAL
  35. Konus-Wind observation of GRB 130821A
  36. GRB 130816A: REM NIR candidate afterglow
  37. Refined IPN Triangulation of GRB 130812B
  38. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  39. GRB 130719A: Swift detection of a burst
  40. Fermi GBM trigger 394325281 / 130630950 is not a GRB
  41. GRB 130627B: Swift detection of a burst
  42. Swift Trigger 558828 is not an interesting event
  43. GRB 130615A: Swift detection of a burst
  44. Swift Trigger 557674 was due to an onboard position error
  45. GRB 130606A, Swift-BAT refined analysis
  46. GRB 130606A: EVLA detection
  47. GRB 130606A: Skynet/PROMPT detection of the optical afterglow
  48. GRB 130606A: Enhanced Swift-XRT position
  49. GRB 130606A: AAO optical observations
  50. GRB130606A: Montarrenti Observatory afterglow detection
  51. Virtual Telescope observations of GRB 130606A
  52. GRB 130606A: IRSF NIR Observation
  53. GRB 130606A: NOT afterglow detection
  54. GRB 130606A: Swift detection of a burst
  55. GRB 130605A: GROND afterglow candidate
  56. Swift Trigger 557466 is probably not real.
  57. GRB 130603A: Swift-XRT and Swift-UVOT detections
  58. GRB 130511A: Swift detection of a burst with an optical counterpart
  59. GRB 130504C: Fermi GBM detection
  60. GRB 130502A: Swift-BAT refined analysis
  61. GRB 130502B: Fermi GBM detection of a burst
  62. GRB 130427A: high energy gamma-ray detection by AGILE
  63. GRB 130427B: MITSuME Ishigakijima upper limits
  64. GRB 130427A optical time series
  65. Konus-Wind observation of GRB 130427A
  66. GRB 130427A: SPI-ACS/INTEGRAL observations
  67. GRB 130427B: MITSuME Okayama upper limits
  68. GRB 130427A: RAPTOR Bright Counterpart Before Swift Trigger
  69. GRB 130427A: Fermi GBM observation
  70. GRB 130427A: Fermi-LAT detection of a burst
  71. GRB 130427A: Swift-BAT refined analysis
  72. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  73. GRB 130420B: CARMA and VLA radio observations
  74. GRB 130418A: Swift detection of a burst with an optical counterpart
  75. GRB 130211A: Retraction of afterglow candidate
  76. Konus-Wind observation of GRB 130320B
  77. GRB 130327B: Fermi GBM detection
  78. GRB 130327A: Swift detection of a burst
  79. GRB 130315A: GROND afterglow candidate
  80. GRB 130305A: optical upper limit in Mondy observatory
  81. GRB 130313A: optical upper limit in Mondy observatory
  82. GRB 130315A: Swift-XRT refined Analysis
  83. GRB 130315A, Swift-BAT refined analysis
  84. GRB 130315A: Swift detection of a burst
  85. Konus-Wind observation of GRB 130306A
  86. GRB 130306A: Fermi GBM observation
  87. GRB 130305A: P60 Observations
  88. GRB 121128A: optical observations in Mondy observatory
  89. GRB 121128A: optical upper limit in Maidanak observatory
  90. GRB 130206A: GROND Observations
  91. GRB 130131A: Swift-BAT refined analysis
  92. GRB 130122A: optical observations
  93. GRB 121229A: MAXI/GSC detection
  94. GRB 121217A: Swift detection of a burst
  95. GRB 121211A: Fermi GBM observation
  96. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  97. GRB 121211A: Swift detection of a burst with an optical counterpart
  98. GRB 121209A: GROND optical afterglow candidate
  99. IPN Triangulation of GRB 121118B (long/intense)
  100. GRB 121117A: MASTER prompt optical limit

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