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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"

5401 results found.

  1. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  2. GRB060807: Optical limiting magnitudes
  3. VLA Upper Limit on Outburst of SGR 1806-20
  4. GRB 060801, optical observation
  5. GRB 060801: Swift detection of a short burst
  6. Swift-BAT trigger 221873 is not a GRB or a Transient
  7. GRB060712: MASTER optical observation
  8. GRB120706: MASTER optical observation
  9. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  10. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  11. GRB060512: near IR observations
  12. GRB 060610: KAIT observations
  13. GRB 070706B: Watcher upper limit
  14. GRB060602A: Swift/UVOT upper limits
  15. GRB 060605: RTT150 optical observations
  16. GRB 060605: Swift-XRT Team refined analysis
  17. GRB 060605: RTT150 optical observations
  18. GRB 060605: Swift detection of a burst with optical counterpart
  19. GRB 060605: ROTSE-III Detection of Optical Counterpart
  20. GRB060502b: optical observations
  21. GRB 060526: REM observations
  22. GRB 060526: MDM-2.4m Observations
  23. GRB 060515: Super-LOTIS Observations
  24. GRB 060515: Swift detection of a burst
  25. GRB 060512: P60 Observations
  26. GRB060512 - SDSS Pre-Burst Observations
  27. GRB060512 Name Correction: LT Afterglow detection
  28. GRB060512: Liverpool Telescope Afterglow detection
  29. GRB060507: optical afterglow detection
  30. GRB060425: new MASTER survey method
  31. GRB060502A, optical observation
  32. GRB 060502A: Swift/UVOT source detection
  33. GRB 060502B: MDM Optical Observation
  34. GRB 060502B: Swift detection of a short burst
  35. GRB060502: Super-LOTIS Observations
  36. GRB 060502: Swift detection of a burst with an optical counterpart
  37. GRB 060428B: KAIT observations
  38. GRB060428A: Swift/UVOT observations.
  39. GRB 060428: Swift detection of a burst
  40. GRB060424: optical afterglow detection
  41. GRB 060421: TTT Observations
  42. Konus-Wind observation of GRB 060418
  43. GRB060418: Optical Observations
  44. GRB060418: Swift XRT Team Refined Analysis
  45. GRB060418: Magellan/MIKE Spectroscopic Redshift
  46. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  47. GRB060403: optical observations
  48. SGR 1900+14: BAT observations
  49. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  50. SGR 1900+14: Swift-BAT detection of a bright outburst
  51. GRB 060322: Confirmation of Swift XRT afterglow
  52. GRB 060211A: optical observation
  53. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  54. GRB 060322: Swift XRT afterglow candidate
  55. GRB 060323: Swift/UVOT Observations
  56. GRB 060323: Swift XRT refined analysis
  57. GRB060218/SN2006aj: optical observations
  58. GRB060319: Swift XRT refined analysis
  59. GRB060319: Swift/UVOT upper limits
  60. GRB060319: MASTER limit
  61. GRB060319: MASTER optical observation
  62. GRB 060313: Swift/UVOT Observations
  63. GRB 060313, SMARTS optical/IR observations
  64. GRB 060312: Swift detection of a burst
  65. GRB060218: analysis of the XMM-Newton observation
  66. GRB 060218/SN 2006aj: WIRO optical observations
  67. GRB 060218/SN 2006aj: RBO optical observations
  68. GRB 060218: Refined analysis of the radio afterglow
  69. GRB 060218: optical/nIR observations at La Palma
  70. GRB 060218A: ROTSE-III Possible Optical Flare
  71. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  72. GRB060218 : SDSS pre-burst observations
  73. GRB 060218: Swift XRT Position
  74. GRB 060218: Swift-BAT detection of a possible burst
  75. GRB 060211b: WIRO NIR Observations
  76. GRB 060211a: WIRO NIR Observations
  77. GRB 050826: Optical Afterglow and Host Galaxy
  78. GRB 060211A: Swift XRT Team Refined Analysis
  79. GRB060210:Faulkes Telescope North Afterglow Confirmation
  80. GRB 060210: candidate afterglow
  81. GRB060210: Optical afterglow
  82. Orphan GRB Afterglow candidate
  83. GRB060206: Swift XRT Refined Analysis
  84. GRB060206: P60 Optical Observations
  85. GRB060206: Swift XRT Position
  86. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  87. GRB 060203: RTT150 optical observations
  88. GRB 060203: P60 Confirmation of Optical Afterglow
  89. GRB 060202: Gemini-N J, H, K_s observations
  90. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  91. GRB 060121: I-band Limits
  92. GRB060121: SARA Observations
  93. GRB 060117: PROMPT Observations
  94. GRB 060116: PROMPT Observations
  95. GRB 060115: PROMPT Observations
  96. GRB 060114: Swift/UVOT Observations
  97. GRB 060115: MITSuME optical afterglow candidate
  98. GRB060111A: RTT150 optical observations
  99. GRB 060110: Optical limit
  100. Swift-BAT trigger 175653 is not an astrophysical source

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