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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"

42534 results found.

  1. GRB 130511A: Enhanced Swift-XRT position
  2. GRB 130511A: Gemini-North Redshift
  3. GRB 130511A: Swift detection of a burst with an optical counterpart
  4. GRB 130508A: Swift/UVOT Upper Limits
  5. GRB 130508A: MITSuME Akeno upper limits
  6. GRB 130427A: host galaxy observations
  7. GRB 130508A: RATIR Optical and NIR Observations
  8. GRB 130427A: Keck/LRIS Observations
  9. GRB 130508A: Refined Swift-XRT analysis: Correction to GCN 14612
  10. GRB 130508A, Swift-BAT refined analysis
  11. GRB 130508A: MITSuME Okayama upper limits
  12. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  13. GRB130508A: BOOTES-3 optical limit
  14. GRB 130427A: Ten nights of Skynet/PROMPT/GORT observations
  15. GRB 130508A: Swift detection of a probable burst
  16. GRB 130427A: Continued RATIR Optical and NIR Observations
  17. GRB 130427A, LBT optical spectrum
  18. GRB 130505B: Further Swift observations
  19. GRB 130504C: Swift-XRT afterglow confirmation
  20. GRB 130505A: MITSuME Akeno Optical observation
  21. GRB 130504C: Suzaku WAM observation of the prompt emission
  22. GRB 130504B: Suzaku WAM observation of the prompt emission
  23. GRB 130505A: Suzaku WAM observation of the prompt emission
  24. GRB 130427A, Watcher afterglow detection
  25. GRB 130427A: Excess optical emission consistent with an emerging supernova
  26. GRB 130427A: Amateur observations from Sweden
  27. GRB 130505A: RATIR Optical and NIR Observations
  28. GRB 130505B: Swift Candidate Afterglow
  29. GRB 130505A: Tautenburg afterglow observations
  30. GRB 130427A: Tautenburg afterglow observations
  31. GRB 130427A: RHESSI observations
  32. GRB 130505A, Swift-BAT refined analysis
  33. GRB 130504C: further Swift-XRT observations
  34. Konus-Wind observation of GRB 130504C
  35. GRB 130505B: MAXI/GSC detection
  36. GRB 130505A: optical observations
  37. GRB 130504C: Swift-XRT observations
  38. GRB 130504C: Fermi GBM detection
  39. GRB 130427A: optical observations in CrAO
  40. GRB 130502A: optical upper limit
  41. GRB 130505A: Swift-XRT refined Analysis
  42. GRB 130505A: Largest E_iso ever measured
  43. Konus-Wind observation of GRB 130505A
  44. GRB 130504C: Fermi-LAT detection of a burst
  45. Swift/UVOT observations of GRB130505A
  46. GRB 130505A: iTelescope T12 optical observations
  47. GRB 130505A: Xinglong TNT optical observations
  48. GRB 130505A; Weihai optical observations
  49. GRB 130505A: Enhanced Swift-XRT position
  50. GRB 130505A: MITSuME Okayama Optical Observation
  51. GRB 130505A - Gemini-N/GMOS redshift determination
  52. GRB 130505A: MAXI/GSC detection
  53. Konus-Wind observation of GRB 130504B
  54. GRB 130504A: IAC80 optical candidate
  55. GRB 130505A: Swift detection of a burst with optical afterglow
  56. GRB 130504A: MITSuME Okayama upper limits
  57. GRB 130504B: Fermi GBM detection
  58. GRB 130504A: Bassano Bresciano Observatory optical upper limit
  59. GRB 130504A: Enhanced XRT position
  60. GRB 130502B: Suzaku WAM observation of the prompt emission
  61. GRB 130504A: Swift/UVOT Upper Limits
  62. GRB 130502B: Swift-XRT refined Analysis
  63. GRB 130504A, Swift-BAT refined analysis
  64. Swift-XRT X-ray afterglow candidate for GRB 130504A (BAT trigger 555096)
  65. GRB 130502B: possible TNG counterpart
  66. Trigger 555096: Swift detection of a possible burst
  67. GRB 130502A: Swift-BAT refined analysis
  68. GRB 130427A: Non-observation of VHE emission with HAWC
  69. GRB130502A: MASTER-Net optical observations
  70. GRB 130502A: Swift-XRT refined Analysis
  71. GRB 130502A: Fermi GBM detection
  72. GRB 130502B: Swift/UVOT Upper Limits
  73. GRB 130502A: Swift/UVOT Upper Limits
  74. Konus-Wind observation of GRB 130502B
  75. GRB 130502B: P60 Observations
  76. GRB 130502B Swift-XRT observations
  77. GRB 130502A: RATIR Optical and NIR Observations
  78. GRB 130427A: Pan-STARRS 1 optical observations
  79. GRB 130418A: TNG NIR observations
  80. GRB 130502A: Enhanced Swift-XRT position
  81. GRB 130502A: OSN and IAC80 I-band observations
  82. GRB 130427A: MITSuME Ishigakijima Optical Observation after 5 days
  83. GRB 130502A: z-band observations from GTC
  84. GRB 130502B: Fermi LAT Detection
  85. GRB 130502A: TNG candidate counterpart
  86. GRB 130502B: Fermi GBM detection of a burst
  87. GRB 130502A: T100 Observations
  88. GRB 130502A: Swift detection of a burst
  89. GRB 130427A: Predictions about the occurrence of a supernova
  90. GRB 130427A: KAIT optical observations
  91. GRB 130425A: Suzaku WAM observation of the prompt emission
  92. GRB 130427A: SARA-N optical observations
  93. GRB 130427A: VLA 20 GHz detection
  94. GRB 130427A: ABT optical observations
  95. GRB 130427A: High-energy neutrino search
  96. GRB 130427A: GMRT radio detection
  97. GRB 130427A: Continued GMG optical observations
  98. GRB 130427A: Nishi-Harima Optical Spectroscopic Observations
  99. GRB 130427A: photo-z of possible SDSS host galaxy
  100. GRB 130427A: high energy gamma-ray detection by AGILE

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