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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"

3759 results found.

  1. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  2. GRB 060515: ROTSE-III Optical Limits
  3. GRB 060510B: Super-LOTIS Observations
  4. GRB060502B: improvement in the XRT afterglow position
  5. GRB 060501: MDM Observations
  6. GRB060428B: optical observation
  7. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  8. GRB 060427B: MASTER optical observations
  9. GRB060428B: Swift XRT Team refined analysis
  10. GRB 060428B: KAIT observations
  11. GRB060428A: Swift/UVOT observations.
  12. GRB060428B, optical observation
  13. GRB 060421: TTT Observations
  14. GRB060418: Magellan/MIKE Spectroscopic Redshift
  15. GRB060413: Swift/UVOT upper limits
  16. SGR 1900+14: Swift detection of an outburst
  17. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  18. GRB060331: Swift/UVOT upper limits
  19. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  20. SGR 1900+14: Swift-BAT detection of a bright outburst
  21. GRB 060211A: optical observation
  22. GRB 060313: Possible optical counterpart
  23. GRB 060121: HST observations
  24. GRB 060218/SN 2006aj: ABT observations
  25. GRB 060218: rebrightening
  26. GRB060213: MASTER final result
  27. GRB060213:_MASTER_optical_observation
  28. GRB 050826: Optical Afterglow and Host Galaxy
  29. GRB060210: Swift/UVOT Upper Limits
  30. GRB 060211B: Swift-XRT Team refined analysis
  31. GRB 060206: WSRT Radio Observations
  32. GRB 060204A: ROSAT Pointing
  33. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  34. Swift-BAT trigger is GRB 060203
  35. GRB060202, optical observation
  36. GRB060105: refined analysis of the Suzaku observation
  37. GRB 060121: Swift/UVOT upper limits
  38. GRB 060116: UKIRT IR Observations
  39. GRB060115, optical observation
  40. GRB 060111B: MITSuME detection of optical afterglow
  41. GRB 060111B: TAROT optical observation
  42. GRB 060111B: Refined analysis of the Swift-BAT burst
  43. GRB 060110: IR Candidate Afterglow
  44. GRB 060110: Optical observation
  45. GRB 060110: Correction
  46. GRB 050110: IR Observations
  47. GRB060105: Swift detection of a bright long burst
  48. GRB 060102: MDM Observation
  49. GRB 060102: Swift-BAT refined analysis
  50. Time Correction to GRB 060102
  51. GRB 060102: Swift-BAT detection of a burst
  52. GRB051227: Radio Observations
  53. GRB 051227: Magellan r'-band Imaging/Astrometry
  54. GRB 051227: P60 Observations
  55. GRB 051227: MDM Observation
  56. GRB 051227: R-band object in the XRT error circle
  57. Swift detection of an RS CVn flare star
  58. GRB 051211A,optical observation
  59. GRB 051211B: Swift XRT confirmation of the afterglow
  60. GRB 051211B: Swift XRT Observations
  61. IPN observations of SGR1806-20
  62. GRB 051109B: GAO 150cm telescope Optical limit
  63. GRB 051028 Optical Observations
  64. GRB 051111: Radio afterglow
  65. GRB 051111a: IR photometry
  66. GRB 051109A: KAIT optical observations
  67. GRB 051105B (INTEGRAL 2701): Optical observation
  68. GRB051028:MASTER correction and final results
  69. GRB051028: optical observations
  70. GRB051028: Swift/UVOT upper limits
  71. GRB051028:MASTER observations
  72. GRB 051028 (=H3951): A GRB localized by HETE
  73. GRB051028:MASTER optical observations
  74. GRB051021A: Swift XRT refined analysis
  75. GRB051021: Swift/UVOT Upper Limits
  76. GRB051021: Swift XRT analysis
  77. GRB 051016B: Swift detection of a soft burst
  78. GRB051006: optical observations
  79. GRB050908: optical observations
  80. GRB050922C: UVES/VLT high resolution spectroscopy
  81. GRB 050922B,optical observation
  82. GRB050820B: analysis of the XMM-Newton observation
  83. GRB 050915a: IR Transient
  84. GRB 050915: IR Observations
  85. GRB050915: P60 Optical Observations
  86. GRB050915: XRT position
  87. Swift-BAT trigger 155072 ground analysis
  88. Swift-BAT trigger 155072 is probably not a GRB
  89. GRB050914: XRT position probably due to cosmic ray
  90. GRB 050904 BAT refined analysis of complete data set
  91. GRB050904: Swift-BAT detection of a probable burst
  92. GRB 050827: P200 NIR Observations
  93. GRB 050827: Optical Limit
  94. GRB050827: RTT150 optical observations
  95. GRB050827: Swift-BAT detection of a burst
  96. GRB 050824: ROTSE-III Optical Limits
  97. GRB 050820B: Swift XRT position
  98. GRB050815: Swift XRT afterglow localization
  99. GRB050815: Swift-BAT detection of a burst
  100. RBO GRB 050714A and GRB 050716 observations

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