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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"

16026 results found.

  1. GRB060502B: improvement in the XRT afterglow position
  2. GRB 060507: Swift/UVOT Upper Limits
  3. GRB 060507: MDM Optical Upper Limit
  4. GRB060425: new MASTER survey method
  5. GRB 060502b: Second epoch Gemini observations
  6. GRB 060428B: spectroscopy
  7. GRB 060502B: optical observations
  8. GRB060502A, optical observation
  9. GRB 060502B: MDM Optical Observation
  10. GRB 060502B: AROMA optical observations
  11. GRB 060502B: Xinglong optical observation
  12. GRB 060502B: MASTER optical observations
  13. GRB060502: Gemini spectroscopy
  14. GRB060501: Swift UVOT followup observations
  15. GRB 060502: P60 Afterglow Confirmation
  16. GRB 060502: Swift detection of a burst with an optical counterpart
  17. GRB060501: Super-LOTIS observations
  18. GRB 060501: ROTSE-III Optical Limits
  19. GRB060428B: optical observation
  20. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  21. GRB 060428B: MDM Observations
  22. GRB 060427B: MASTER optical observations
  23. GRB060428B: Swift XRT Team refined analysis
  24. GRB 060428B: KAIT observations
  25. GRB060425:MASTER optical limit
  26. GRB060428A: Swift/UVOT observations.
  27. GRB060428B, optical observation
  28. GRB060427:MASTER optical limit
  29. GRB 060428b: Optical afterglow candidate
  30. GRB060427: Xinglong optical Observations
  31. GRB 060427: NOT observations
  32. GRB 060427, optical observation
  33. GRB060424: optical afterglow detection
  34. No OT 060420 in MASCOT images
  35. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  36. GRB060418: optical observations
  37. Konus-Wind observation of GRB 060418
  38. GRB(?)060421:MASTER optical limit
  39. Possible GRB060421: BART limits
  40. GRB 060418 : Lulin Optical follow-up
  41. GRB 060418: Radio Observations
  42. GRB060418: Optical Observations
  43. GRB 060418, SMARTS optical/IR afterglow observations
  44. GRB060418 : LT optical afterglow observation
  45. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  46. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  47. GRB060403: optical observations
  48. GRB 060403 Optical observations
  49. GRB 060403: MITSuME optical observation
  50. GRB060403: Optical Limit
  51. HETE Triggers H4043 and H4044 Not Due to New Cosmic Source
  52. HETE trigger H4044: RTT150 optical observations
  53. H4044, a Repeat Outburst From The Source of H4043 (="GRB060331")
  54. HETE Trigger 4043: ROTSE-III Optical Limits
  55. H4043, an unusual high-energy transient observed by HETE
  56. GRB 060322: LNA optical limit
  57. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  58. GRB 060323 : WIDGET simultaneous optical observations
  59. GRB 060323: Early optical observation at Xinglong
  60. GRB060218, optical observations
  61. GRB 060211A: optical observation
  62. GRB060323: optical limit
  63. GRB060211B: optical observation
  64. GRB060323: NOT optical observations
  65. GRB 060322: IAC80 optical observations
  66. GRB060323: P60 Observations
  67. GRB 060323: Swift/UVOT Observations
  68. GRB 060323: optical afterglow confirmed
  69. GRB060323: NOT observations
  70. GRB 060323: Optical Observations
  71. GRB 060323: optical observations at TNG
  72. GRB060323, optical observation
  73. GRB 060323: Swift detection of a burst with a possible optical afterglow
  74. GRB060219: optical observation
  75. GRB060206: optical observation
  76. GRB060218/SN2006aj: optical observations
  77. GRB 060218/SN 2006aj, LNA optical observation
  78. GRB 060319: IAC-80 optical observations
  79. GRB 060319: Re-analysis of TNG data
  80. GRB 060319 optical observations at TNG
  81. GRB060319 : Liverpool Telescope optical limit
  82. GRB060319: MASTER optical observation
  83. GRB060313: Radio Observations
  84. GRB 060313: early afterglow NIR upper limits with REM
  85. GRB 060313: Swift-XRT team refined analysis
  86. GRB060313: optical observations of the afterglow candidate
  87. GRB 060313, SMARTS optical counterpart?
  88. GRB 060313: Possible optical counterpart
  89. GRB 060313, SMARTS optical/IR observations
  90. GRB060313: optical and near infrared observations with REM
  91. GRB 060312: ROTSE-III Optical Limits
  92. GRB060218: analysis of the XMM-Newton observation
  93. GRB 060218: RTT150 optical observations
  94. GRB060223b: optical limit
  95. GRB060218/SN 2006aj: optical observation in V
  96. GRB060218/SN 2006aj: optical observation
  97. GRB 060121: HST observations
  98. GRB 060218/SN 2006aj: K-380 optical observations
  99. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  100. GRB200618: optical polarimetry and photometry

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