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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"

42903 results found.

  1. GRB 060428A: Refined analysis of the Swift-BAT burst
  2. GRB 060428b : Kiso R-band limit
  3. GRB 060428b: Optical afterglow candidate
  4. GRB060428A: Swift XRT Team refined analysis
  5. GRB 060428B: Swift detection of a burst
  6. GRB 060427: NIR observations
  7. GRB060427: Xinglong optical Observations
  8. GRB 060428: Swift detection of a burst
  9. GRB 060427: NOT observations
  10. GRB 060427: Refined analysis of the Swift-BAT burst
  11. GRB060427: Swift XRT Team refined analysis
  12. GRB060418: Swift XRT Team Further Refined Analysis
  13. GRB 060427: Swift detection of a burst
  14. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  15. An interactive program for GRB pseudo-redshift computations
  16. GRB060424: optical afterglow detection
  17. GRB060418: Further Analysis of MIKE Spectroscopy
  18. GRB 060424: Refined analysis of the Swift-BAT burst
  19. GRB 060424: Swift detection of a burst
  20. GRB 060421: TTT Observations
  21. OT 060420: Likely Not a New Cosmic Transient
  22. No OT 060420 in MASCOT images
  23. Swift-BAT detection of Mrk 421
  24. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  25. GRB060421: Swift/UVOT observations
  26. GRB 060421: Swift-BAT Refined Analysis
  27. GRB 060421: Swift-XRT refined analysis
  28. GRB 060418: prediction of t_break
  29. GRB060418: optical observations
  30. Konus-Wind observation of GRB 060418
  31. Possible GRB060421: BART limits
  32. GRB(?) 060421: Swift detection of a burst
  33. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  34. GRB 060418: Radio Observations
  35. GRB060418, BVRcIc field calibration
  36. GRB060418: Optical Observations
  37. GRB 060418: FRAM early afterglow observation
  38. VLT/UVES observations of GRB060418
  39. GRB060418: Swift XRT Team Refined Analysis
  40. GRB 060418, SMARTS continuing afterglow observations
  41. GRB 060418: PROMPT Detections
  42. GRB 060418, SMARTS optical/IR afterglow observations
  43. GRB060418: Magellan/MIKE Spectroscopic Redshift
  44. GRB060418 : LT optical afterglow observation
  45. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  46. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  47. GRB 060413: REM NIR Observations
  48. SGR 1900+14: Swift detection of an outburst
  49. GRB 060413: Watcher UBVR observations
  50. GRB 060413: XRT refined analysis
  51. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  52. GRB 060413: Swift detection of a burst
  53. GRB060403: optical observations
  54. GRB 060403 Optical observations
  55. GRB 060403: MITSuME optical observation
  56. GRB060403: Optical Limit
  57. GRB060403: XRT refined analysis
  58. GRB 060403: Swift/UVOT upper limits
  59. HETE Triggers H4043 and H4044 Not Due to New Cosmic Source
  60. SGR 1900+14: BAT observations
  61. GRB 060403: Refined analysis of the Swift-BAT burst
  62. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  63. GRB 060403: Swift detection of a burst
  64. GRB060331: Swift/UVOT upper limits
  65. H4044, a Repeat Outburst From The Source of H4043 (="GRB060331")
  66. Swift XRT observations of the HETE transient H4043
  67. HETE Trigger 4043: ROTSE-III Optical Limits
  68. H4043, an unusual high-energy transient observed by HETE
  69. GRB 060322: LNA optical limit
  70. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  71. INTEGRAL and XMM ToO observations of SGR1900+14
  72. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  73. SGR 1900+14: Swift-BAT detection of a bright outburst
  74. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  75. GRB 060323 : WIDGET simultaneous optical observations
  76. GRB 060323: Early optical observation at Xinglong
  77. GRB060218, optical observations
  78. GRB 060322: Confirmation of Swift XRT afterglow
  79. GRB 060211A: optical observation
  80. GRB060323: optical limit
  81. GRB060211B: optical observation
  82. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  83. SGR 1900+14: Swift detection of renewed activity
  84. GRB060323: NOT optical observations
  85. GRB 060322: IAC80 optical observations
  86. GRB 060322: Swift XRT afterglow candidate
  87. GRB060323: P60 Observations
  88. GRB 060323: Swift/UVOT Observations
  89. GRB 060323: optical afterglow confirmed
  90. GRB060323: NOT observations
  91. GRB 060323: Tautenburg OT candidate retraction
  92. GRB 060323: Refined analysis of the Swift-BAT burst
  93. GRB 060323: optical observations at TNG
  94. GRB 060323: Swift XRT refined analysis
  95. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  96. GRB 060323: Swift/XRT position
  97. GRB 060322: Refined analysis of the Swift-BAT burst
  98. GRB060323 - SDSS Pre-Burst Observations
  99. GRB 060323: Swift detection of a burst with a possible optical afterglow
  100. GRB 060322: Swift-BAT detection of a 200-sec burst

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