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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"

3674 results found.

  1. GRB 050223: Magellan redshift
  2. GRB050223: Host Galaxy
  3. GRB 060605: RTT150 optical observations
  4. GRB 060522: PROMPT Optical Limits
  5. GRB 060605: RTT150 optical observations
  6. GRB 060605: ROTSE-III Detection of Optical Counterpart
  7. GRB 060604: Swift-XRT Team refined analysis
  8. GRB 060602B: XMM-Newton Survey Source
  9. GRB 060602B: Swift-XRT Refined Analysis
  10. GRB 060602B: RTT150 optical observations
  11. GRB 060602B: Swift detection of a burst
  12. GRB060602B: BOOTES-IR candidate afterglow
  13. GRB060526, optical observations
  14. GRB 060526: RTT150 optical observations
  15. GRB 060526: REM observations
  16. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  17. GRB 060515: ROTSE-III Optical Limits
  18. GRB 060510B: Super-LOTIS Observations
  19. GRB060502B: improvement in the XRT afterglow position
  20. GRB 060501: MDM Observations
  21. GRB060428B: optical observation
  22. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  23. GRB 060427B: MASTER optical observations
  24. GRB060428B: Swift XRT Team refined analysis
  25. GRB 060428B: KAIT observations
  26. GRB060428A: Swift/UVOT observations.
  27. GRB060428B, optical observation
  28. GRB 060421: TTT Observations
  29. GRB060418: Magellan/MIKE Spectroscopic Redshift
  30. GRB060413: Swift/UVOT upper limits
  31. SGR 1900+14: Swift detection of an outburst
  32. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  33. GRB060331: Swift/UVOT upper limits
  34. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  35. SGR 1900+14: Swift-BAT detection of a bright outburst
  36. GRB 060211A: optical observation
  37. GRB 060313: Possible optical counterpart
  38. GRB 060121: HST observations
  39. GRB 060218/SN 2006aj: ABT observations
  40. GRB 060218: rebrightening
  41. GRB060213: MASTER final result
  42. GRB060213:_MASTER_optical_observation
  43. GRB 050826: Optical Afterglow and Host Galaxy
  44. GRB060210: Swift/UVOT Upper Limits
  45. GRB 060211B: Swift-XRT Team refined analysis
  46. GRB 060206: WSRT Radio Observations
  47. GRB 060204A: ROSAT Pointing
  48. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  49. Swift-BAT trigger is GRB 060203
  50. GRB060202, optical observation
  51. GRB060105: refined analysis of the Suzaku observation
  52. GRB 060121: Swift/UVOT upper limits
  53. GRB 060116: UKIRT IR Observations
  54. GRB060115, optical observation
  55. GRB 060111B: MITSuME detection of optical afterglow
  56. GRB 060111B: TAROT optical observation
  57. GRB 060111B: Refined analysis of the Swift-BAT burst
  58. GRB 060110: IR Candidate Afterglow
  59. GRB 060110: Optical observation
  60. GRB 060110: Correction
  61. GRB 050110: IR Observations
  62. GRB060105: Swift detection of a bright long burst
  63. GRB 060102: MDM Observation
  64. GRB 060102: Swift-BAT refined analysis
  65. Time Correction to GRB 060102
  66. GRB 060102: Swift-BAT detection of a burst
  67. GRB051227: Radio Observations
  68. GRB 051227: Magellan r'-band Imaging/Astrometry
  69. GRB 051227: P60 Observations
  70. GRB 051227: MDM Observation
  71. GRB 051227: R-band object in the XRT error circle
  72. Swift detection of an RS CVn flare star
  73. GRB 051211A,optical observation
  74. GRB 051211B: Swift XRT confirmation of the afterglow
  75. GRB 051211B: Swift XRT Observations
  76. IPN observations of SGR1806-20
  77. GRB 051109B: GAO 150cm telescope Optical limit
  78. GRB 051028 Optical Observations
  79. GRB 051111: Radio afterglow
  80. GRB 051111a: IR photometry
  81. GRB 051109A: KAIT optical observations
  82. GRB 051105B (INTEGRAL 2701): Optical observation
  83. GRB051028:MASTER correction and final results
  84. GRB051028: optical observations
  85. GRB051028: Swift/UVOT upper limits
  86. GRB051028:MASTER observations
  87. GRB 051028 (=H3951): A GRB localized by HETE
  88. GRB051028:MASTER optical observations
  89. GRB051021A: Swift XRT refined analysis
  90. GRB051021: Swift/UVOT Upper Limits
  91. GRB051021: Swift XRT analysis
  92. GRB 051016B: Swift detection of a soft burst
  93. GRB051006: optical observations
  94. GRB050908: optical observations
  95. GRB050922C: UVES/VLT high resolution spectroscopy
  96. GRB 050922B,optical observation
  97. GRB050820B: analysis of the XMM-Newton observation
  98. GRB 050915a: IR Transient
  99. GRB 050915: IR Observations
  100. GRB050915: P60 Optical Observations

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