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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"

37588 results found.

  1. GRB 130518A: RATIR Optical and NIR Observations
  2. GRB 130518A: Swift XRT and UVOT possible afterglow
  3. Konus-Wind observation of GRB 130518A
  4. GRB 130518A Swift-BAT position from ground analysis
  5. GRB 130518A: Fermi LAT detection
  6. GRB 130518A: Fermi GBM detection
  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. Konus-Wind observation of GRB 130515A
  13. GRB 130515A: FORS2 spectroscopy of candidate counterpart
  14. GRB 130427A: Continued RATIR Optical and NIR Observations - Photometric Evidence for a New Component
  15. GRB 130514B: RATIR Optical and NIR Observations
  16. Fermi GBM trigger 390275038 / 130515072 is not a GRB
  17. GRB 130515A: Fermi GBM detection
  18. GRB 130427A: Skynet detections of a possible supernova
  19. GRB 130515A: Swift-XRT refined Analysis
  20. GRB 130515A: Swift/UVOT Upper Limits
  21. GRB 130514B Swift-BAT observations
  22. GRB 130515A: Swift-BAT refined analysis
  23. GRB 130514B: GROND observations
  24. GRB 130515A: Gemini/GMOS Observations
  25. GRB 130515A: GROND Observations
  26. GRB 130515A: Enhanced Swift-XRT position
  27. GRB 130515A: VLT acquisition observation
  28. GRB 130511A: SSO 2.3m observation
  29. GRB 130514B: Swift-XRT Observations
  30. GRB 130515A: Swift detection of a short burst
  31. GRB 130514A: Swift-XRT refined Analysis
  32. GRB 130514A: Skynet/PROMPT/DSO Detections
  33. GRB 130513A: Bassano Bresciano optical upper limit
  34. GRB 130427A: Spectroscopic detection of the SN from the 10.4m GTC
  35. GRB 130427A: optical observations
  36. GRB130514B: MASTER-Net optical observations.
  37. GRB 130514A: RATIR Optical and NIR Observations
  38. GRB 130513A: RATIR Optical and NIR Observations
  39. GRB 130513A: Swift/UVOT Upper Limits
  40. GRB 130514A: Swift/UVOT Upper Limits
  41. GRB 130513A: GROND observations
  42. GRB 130514B: a long GRB detected by INTEGRAL
  43. GRB 130514A: Enhanced Swift-XRT position
  44. GRB 130514A: Swift-BAT refined analysis
  45. GRB 130513A: Swift-XRT detection of the afterglow.
  46. GRB 130514A: GROND optical-NIR afterglow discovery and photo-z
  47. GRB 130514A: P60 Observations
  48. GRB 130514A: Swift detection of a burst
  49. GRB 130427A: Tautenburg 2nd epoch: No break, no clear SN
  50. GRB 130513A: a long GRB detected by INTEGRAL
  51. GRB130508A: MASTER-Net optical observations
  52. GRB130511A: SOAO Optical Observation
  53. GRB 130511A: Swift-XRT refined Analysis
  54. GRB 130511A: Kanata/HOWPol optical observation
  55. GRB 130511A: MITSuME Okayama upper limits
  56. GRB 130511A, Swift-BAT refined analysis
  57. GRB 130511A: Upper limit by Xinglong TNT optical observation
  58. GRB 130511A: Enhanced Swift-XRT position
  59. GRB 130511A: Gemini-North Redshift
  60. GRB 130511A: Swift detection of a burst with an optical counterpart
  61. GRB 130508A: Swift/UVOT Upper Limits
  62. GRB 130508A: MITSuME Akeno upper limits
  63. GRB 130427A: host galaxy observations
  64. GRB 130508A: RATIR Optical and NIR Observations
  65. GRB 130427A: Keck/LRIS Observations
  66. GRB 130508A: Refined Swift-XRT analysis: Correction to GCN 14612
  67. GRB 130508A, Swift-BAT refined analysis
  68. GRB 130508A: MITSuME Okayama upper limits
  69. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  70. GRB130508A: BOOTES-3 optical limit
  71. GRB 130427A: Ten nights of Skynet/PROMPT/GORT observations
  72. GRB 130508A: Swift detection of a probable burst
  73. GRB 130427A: Continued RATIR Optical and NIR Observations
  74. GRB 130427A, LBT optical spectrum
  75. GRB 130505B: Further Swift observations
  76. GRB 130504C: Swift-XRT afterglow confirmation
  77. GRB 130505A: MITSuME Akeno Optical observation
  78. GRB 130504C: Suzaku WAM observation of the prompt emission
  79. GRB 130504B: Suzaku WAM observation of the prompt emission
  80. GRB 130505A: Suzaku WAM observation of the prompt emission
  81. GRB 130427A, Watcher afterglow detection
  82. GRB 130427A: Excess optical emission consistent with an emerging supernova
  83. GRB 130427A: Amateur observations from Sweden
  84. GRB 130505A: RATIR Optical and NIR Observations
  85. GRB 130505B: Swift Candidate Afterglow
  86. GRB 130505A: Tautenburg afterglow observations
  87. GRB 130427A: Tautenburg afterglow observations
  88. Refined IPN Triangulation of GRB 130502B
  89. GRB 130427A: RHESSI observations
  90. GRB 130505A, Swift-BAT refined analysis
  91. GRB 130504C: further Swift-XRT observations
  92. Konus-Wind observation of GRB 130504C
  93. GRB 130505B: MAXI/GSC detection
  94. GRB 130505A: optical observations
  95. GRB 130504C: Swift-XRT observations
  96. GRB 130504C: Fermi GBM detection
  97. GRB 130427A: optical observations in CrAO
  98. GRB 130502A: optical upper limit
  99. GRB 130505A: E_iso record retraction
  100. GRB 130427A: correction to GCN 14487

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