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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"

28259 results found.

  1. GRB 130518A: Swift XRT and UVOT possible afterglow
  2. Konus-Wind observation of GRB 130518A
  3. GRB 130518A: Fermi LAT detection
  4. GRB 130518A: Fermi GBM detection
  5. GRB 130515A: IRSF NIR Observation
  6. GRB 130515A: Further Gemini Observations
  7. GRB 130427A:: BTA spectroscopic observations on May 10/11.
  8. Konus-Wind observation of GRB 130515A
  9. GRB 130515A: FORS2 spectroscopy of candidate counterpart
  10. GRB 130427A: Continued RATIR Optical and NIR Observations - Photometric Evidence for a New Component
  11. GRB 130514B: RATIR Optical and NIR Observations
  12. GRB 130515A: Fermi GBM detection
  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: Swift-XRT refined Analysis
  25. GRB 130514A: Skynet/PROMPT/DSO Detections
  26. GRB 130513A: Bassano Bresciano optical upper limit
  27. GRB 130427A: Spectroscopic detection of the SN from the 10.4m GTC
  28. GRB 130427A: optical observations
  29. GRB 130514A: RATIR Optical and NIR Observations
  30. GRB 130513A: RATIR Optical and NIR Observations
  31. GRB 130513A: Swift/UVOT Upper Limits
  32. GRB 130514A: Swift/UVOT Upper Limits
  33. GRB 130513A: GROND observations
  34. GRB 130514A: Enhanced Swift-XRT position
  35. GRB 130513A: Swift-XRT detection of the afterglow.
  36. GRB 130514A: GROND optical-NIR afterglow discovery and photo-z
  37. GRB 130514A: P60 Observations
  38. GRB 130514A: Swift detection of a burst
  39. GRB 130427A: Tautenburg 2nd epoch: No break, no clear SN
  40. GRB130511A: SOAO Optical Observation
  41. GRB 130511A: Swift-XRT refined Analysis
  42. GRB 130511A: Kanata/HOWPol optical observation
  43. GRB 130511A: MITSuME Okayama upper limits
  44. GRB 130511A: Enhanced Swift-XRT position
  45. GRB 130511A: Swift detection of a burst with an optical counterpart
  46. GRB 130508A: Swift/UVOT Upper Limits
  47. GRB 130508A: MITSuME Akeno upper limits
  48. GRB 130427A: host galaxy observations
  49. GRB 130508A: RATIR Optical and NIR Observations
  50. GRB 130508A: Refined Swift-XRT analysis: Correction to GCN 14612
  51. GRB 130508A: MITSuME Okayama upper limits
  52. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  53. GRB130508A: BOOTES-3 optical limit
  54. GRB 130427A: Ten nights of Skynet/PROMPT/GORT observations
  55. GRB 130508A: Swift detection of a probable burst
  56. GRB 130427A: Continued RATIR Optical and NIR Observations
  57. GRB 130427A, LBT optical spectrum
  58. GRB 130505B: Further Swift observations
  59. GRB 130504C: Swift-XRT afterglow confirmation
  60. GRB 130505A: MITSuME Akeno Optical observation
  61. GRB 130504C: Suzaku WAM observation of the prompt emission
  62. GRB 130427A, Watcher afterglow detection
  63. GRB 130427A: Excess optical emission consistent with an emerging supernova
  64. GRB 130505B: Swift Candidate Afterglow
  65. GRB 130505A: Tautenburg afterglow observations
  66. GRB 130427A: Tautenburg afterglow observations
  67. Refined IPN Triangulation of GRB 130502B
  68. GRB 130504C: further Swift-XRT observations
  69. Konus-Wind observation of GRB 130504C
  70. GRB 130505B: MAXI/GSC detection
  71. GRB 130505A: optical observations
  72. GRB 130504C: Swift-XRT observations
  73. GRB 130504C: Fermi GBM detection
  74. GRB 130427A: optical observations in CrAO
  75. GRB 130502A: optical upper limit
  76. GRB 130505A: Swift-XRT refined Analysis
  77. GRB 130505A: Largest E_iso ever measured
  78. GRB 130504C: Fermi-LAT detection of a burst
  79. Swift/UVOT observations of GRB130505A
  80. GRB 130505A: iTelescope T12 optical observations
  81. GRB 130505A; Weihai optical observations
  82. GRB 130505A: Enhanced Swift-XRT position
  83. GRB 130505A: MITSuME Okayama Optical Observation
  84. GRB 130505A - Gemini-N/GMOS redshift determination
  85. GRB 130505A: MAXI/GSC detection
  86. Konus-Wind observation of GRB 130504B
  87. GRB 130504A: IAC80 optical candidate
  88. GRB 130505A: Swift detection of a burst with optical afterglow
  89. GRB 130504A: MITSuME Okayama upper limits
  90. GRB 130504B: Fermi GBM detection
  91. GRB 130504A: Bassano Bresciano Observatory optical upper limit
  92. GRB 130504A: Enhanced XRT position
  93. GRB 130502B: Suzaku WAM observation of the prompt emission
  94. GRB 130504A: Swift/UVOT Upper Limits
  95. GRB 130502B: Swift-XRT refined Analysis
  96. GRB 130504A, Swift-BAT refined analysis
  97. Swift-XRT X-ray afterglow candidate for GRB 130504A (BAT trigger 555096)
  98. GRB 130502B: possible TNG counterpart
  99. Trigger 555096: Swift detection of a possible burst
  100. GRB 130427A: Non-observation of VHE emission with HAWC

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