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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"

37203 results found.

  1. GRB 060502: APO Spectroscopic Observations
  2. GRB 060502: P60 Afterglow Confirmation
  3. GRB 060502: Swift detection of a burst with an optical counterpart
  4. GRB 060501: MDM Observations
  5. GRB060501: Super-LOTIS observations
  6. GRB060501: P60 imaging and afterglow candidate
  7. GRB 060501: Refined analysis of the Swift-BAT burst
  8. GRB060501: Swift XRT position
  9. GRB 060501: ROTSE-III Optical Limits
  10. GRB 060501: Swift detection of a burst
  11. IPN triangulation of GRB060429 (short/hard)
  12. Konus-Wind observation of GRB 060427B
  13. GRB060428B - SDSS Pre-Burst Observations
  14. GRB060428B: optical observation
  15. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  16. GRB 060428B: MDM Observations
  17. GRB 060428A: PROMPT Observations
  18. GRB 060427B: MASTER optical observations
  19. GRB060428B: Swift XRT Team refined analysis
  20. GRB 060427B: IPN localization of a short hard burst
  21. GRB 060428B: Refined analysis of the Swift-BAT burst
  22. GRB 060428B: Xinglong I-band limit
  23. GRB 060428B: KAIT observations
  24. GRB060425:MASTER optical limit
  25. GRB 051117A: Bright host galaxy not confirmed
  26. GRB 060428A: Refined analysis of the Swift-BAT burst
  27. GRB 060428b : Kiso R-band limit
  28. GRB060427:MASTER optical limit
  29. GRB 060428b: Optical afterglow candidate
  30. GRB060428A: Swift XRT Team refined analysis
  31. GRB 060428B: Swift detection of a burst
  32. GRB 060427: NIR observations
  33. GRB 060428: Swift detection of a burst
  34. GRB 060427: NOT observations
  35. GRB 060427: Swift/UVOT upper limits.
  36. GRB 060427: Refined analysis of the Swift-BAT burst
  37. GRB060427: Swift XRT Team refined analysis
  38. GRB060418: Swift XRT Team Further Refined Analysis
  39. GRB060425:MASTER survey observations
  40. GRB 060427, optical observation
  41. GRB 060427: Swift detection of a burst
  42. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  43. An interactive program for GRB pseudo-redshift computations
  44. GRB060424: optical afterglow detection
  45. GRB060418: Further Analysis of MIKE Spectroscopy
  46. GRB 060424: Refined analysis of the Swift-BAT burst
  47. GRB 060424: Swift detection of a burst
  48. GRB 060421: TTT Observations
  49. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  50. GRB 060421: Swift-BAT Refined Analysis
  51. GRB 060421: Swift-XRT refined analysis
  52. GRB 060418: prediction of t_break
  53. GRB060418: optical observations
  54. Konus-Wind observation of GRB 060418
  55. GRB(?)060421:MASTER optical limit
  56. GRB(?)060421 : XRT position
  57. GRB(?) 060421: Swift detection of a burst
  58. Erratum of GCN 4983 for GRB 060418 IR follow-up
  59. GRB 060418 : IR afterglow observations
  60. GRB 060418 : Lulin Optical follow-up
  61. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  62. GRB 060418: Radio Observations
  63. GRB060418, BVRcIc field calibration
  64. GRB060418: Optical Observations
  65. GRB 060418: FRAM early afterglow observation
  66. GRB 060418: Refined Analysis of the Swift-BAT burst
  67. GRB060418: Swift XRT Team Refined Analysis
  68. GRB 060418, SMARTS continuing afterglow observations
  69. GRB 060418: PROMPT Detections
  70. GRB 060418, SMARTS optical/IR afterglow observations
  71. GRB060418: Magellan/MIKE Spectroscopic Redshift
  72. GRB060418 : LT optical afterglow observation
  73. GRB 060418: REM candidate afterglow
  74. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  75. GRB 060413: REM NIR Observations
  76. GRB 060413: Refined analysis of the Swift-BAT burst
  77. GRB 060413: Watcher UBVR observations
  78. GRB 060413: XRT refined analysis
  79. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  80. GRB 060413: Swift detection of a burst
  81. GRB060403: optical observations
  82. GRB 060403 Optical observations
  83. GRB 060403: MITSuME optical observation
  84. GRB060403: XRT refined analysis
  85. GRB 060403: Swift/UVOT upper limits
  86. SGR 1900+14: BAT observations
  87. GRB 060403: Refined analysis of the Swift-BAT burst
  88. GRB060403: Swift XRT refined position
  89. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  90. GRB 060403: Swift detection of a burst
  91. GRB060331: Swift/UVOT upper limits
  92. HETE Trigger 4043: ROTSE-III Optical Limits
  93. GRB 060322: LNA optical limit
  94. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  95. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  96. GRB 060323 : WIDGET simultaneous optical observations
  97. GRB 060323: Early optical observation at Xinglong
  98. GRB060218, optical observations
  99. GRB 060322: Confirmation of Swift XRT afterglow
  100. GRB 060211A: optical observation

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