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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"

20535 results found.

  1. GRB 130427A / SN 2013cq: Hubble Space Telescope Observations
  2. GRB 130518A: Continued RATIR Optical Observations - Fading
  3. GRB 130518A: RATIR Optical and NIR Observations
  4. GRB 130518A: Swift XRT and UVOT possible afterglow
  5. Konus-Wind observation of GRB 130518A
  6. GRB 130518A Swift-BAT position from ground analysis
  7. VLT observations of GRB 130427A
  8. GRB 130427A: Konkoly optical observations
  9. GRB 130515A: IRSF NIR Observation
  10. GRB 130515A: Further Gemini Observations
  11. GRB 130427A:: BTA spectroscopic observations on May 10/11.
  12. GRB 130514B: RATIR Optical and NIR Observations
  13. GRB 130427A: Skynet detections of a possible supernova
  14. GRB 130515A: Swift-XRT refined Analysis
  15. GRB 130515A: Swift/UVOT Upper Limits
  16. GRB 130514B: GROND observations
  17. GRB 130515A: Gemini/GMOS Observations
  18. GRB 130515A: GROND Observations
  19. GRB 130515A: Enhanced Swift-XRT position
  20. GRB 130515A: VLT acquisition observation
  21. GRB 130511A: SSO 2.3m observation
  22. GRB 130514B: Swift-XRT Observations
  23. GRB 130515A: Swift detection of a short burst
  24. GRB 130514A: Skynet/PROMPT/DSO Detections
  25. GRB 130513A: Bassano Bresciano optical upper limit
  26. GRB 130514A: RATIR Optical and NIR Observations
  27. GRB 130513A: RATIR Optical and NIR Observations
  28. GRB 130513A: Swift/UVOT Upper Limits
  29. GRB 130514A: Swift/UVOT Upper Limits
  30. GRB 130513A: GROND observations
  31. GRB 130514A: Enhanced Swift-XRT position
  32. GRB 130513A: Swift-XRT detection of the afterglow.
  33. GRB 130514A: GROND optical-NIR afterglow discovery and photo-z
  34. GRB 130514A: P60 Observations
  35. GRB 130514A: Swift detection of a burst
  36. GRB 130511A: MITSuME Okayama upper limits
  37. GRB 130511A: Upper limit by Xinglong TNT optical observation
  38. GRB 130511A: Enhanced Swift-XRT position
  39. GRB 130511A: Swift detection of a burst with an optical counterpart
  40. GRB 130508A: Swift/UVOT Upper Limits
  41. GRB 130508A: MITSuME Akeno upper limits
  42. GRB 130508A: RATIR Optical and NIR Observations
  43. GRB 130508A: Refined Swift-XRT analysis: Correction to GCN 14612
  44. GRB 130508A: MITSuME Okayama upper limits
  45. GRB130508A: BOOTES-3 optical limit
  46. GRB 130427A: Ten nights of Skynet/PROMPT/GORT observations
  47. GRB 130508A: Swift detection of a probable burst
  48. GRB 130505B: Further Swift observations
  49. GRB 130505A: Suzaku WAM observation of the prompt emission
  50. GRB 130427A, Watcher afterglow detection
  51. GRB 130427A: Amateur observations from Sweden
  52. GRB 130505A: RATIR Optical and NIR Observations
  53. GRB 130505B: Swift Candidate Afterglow
  54. Refined IPN Triangulation of GRB 130502B
  55. Konus-Wind observation of GRB 130504C
  56. GRB 130505B: MAXI/GSC detection
  57. GRB 130504C: Fermi GBM detection
  58. GRB 130502A: optical upper limit
  59. Konus-Wind observation of GRB 130505A
  60. GRB 130504C: Fermi-LAT detection of a burst
  61. Swift/UVOT observations of GRB130505A
  62. GRB 130505A: Xinglong TNT optical observations
  63. GRB 130505A; Weihai optical observations
  64. GRB 130505A: Enhanced Swift-XRT position
  65. GRB 130505A: MITSuME Okayama Optical Observation
  66. GRB 130504A: IAC80 optical candidate
  67. GRB 130505A: Swift detection of a burst with optical afterglow
  68. GRB 130504A: MITSuME Okayama upper limits
  69. IPN Triangulation of GRB 130504B
  70. GRB 130504A: Bassano Bresciano Observatory optical upper limit
  71. GRB 130504A: Enhanced XRT position
  72. GRB 130504A: Swift/UVOT Upper Limits
  73. GRB 130502B: possible TNG counterpart
  74. Trigger 555096: Swift detection of a possible burst
  75. GRB 130502A: Swift-BAT refined analysis
  76. GRB 130427A: Non-observation of VHE emission with HAWC
  77. IPN Triangulation of GRB 130502B
  78. GRB 130502B: Swift/UVOT Upper Limits
  79. GRB 130502A: Swift/UVOT Upper Limits
  80. Konus-Wind observation of GRB 130502B
  81. GRB 130502B: P60 Observations
  82. GRB 130502B Swift-XRT observations
  83. GRB 130502A: RATIR Optical and NIR Observations
  84. GRB 130427A: Pan-STARRS 1 optical observations
  85. GRB 130418A: TNG NIR observations
  86. GRB 130502A: Enhanced Swift-XRT position
  87. GRB 130427A: MITSuME Ishigakijima Optical Observation after 5 days
  88. GRB 130502A: TNG candidate counterpart
  89. GRB 130502A: T100 Observations
  90. GRB 130502A: Swift detection of a burst
  91. GRB 130427A: Continued RATIR Optical and NIR Observations
  92. GRB 130427A: MITSuME Ishigakijima Optical Observation after 2 days
  93. GRB 130427A: Challis Observatory optical observations
  94. GRB 130427A: Continued Skynet/PROMPT Observations
  95. GRB 130427A: Fermi-LAT refined analysis
  96. GRB 130427A: SARA-N detection
  97. GRB 130427A: Continued RATIR Optical and NIR Observations
  98. GRB 130427A: CrAO RT-22 36 GHz observation
  99. GRB 130418A: Bassano Bresciano Observatory lightcurve analisis
  100. GRB 130425: MASTER-Net optical observations

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