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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"

36147 results found.

  1. GRB 060111: possible UVOT counterpart
  2. GRB 060111: ROTSE-III Optical Limits
  3. GRB 060111: Swift detection of a burst
  4. GRB 060110: Mitsume optical observations
  5. GRB 060110: Swift-BAT refined analysis
  6. GRB 060109: Swift-BAT refined analysis
  7. GRB 060108: z-band imaging from Gemini-North
  8. GRB 060110a: RAPTOR detection of early optical emission.
  9. GRB 060110: UKIRT K-band observations
  10. GRB 060110: ROTSE-III Confirmation of Optical Counterpart
  11. GRB 060110: IR Candidate Afterglow
  12. GRB 060110: Super-LOTIS observations
  13. GRB 060110: Optical observation
  14. GRB 060110: Correction
  15. Correction to GRB 060109 XRT analysis
  16. GRB 050110: IR Observations
  17. GRB 060110: Optical limit
  18. GRB 060110: Swift-BAT detection of a burst
  19. GRB 060109: Refined Swift-XRT analysis
  20. GRB 060109: Swift/UVOT upper limits
  21. GRB060109, optical observation
  22. GRB 060108: ISAS early observations and near IR upper limit
  23. GRB060108: P200 Ks Observations
  24. GRB 060108: early UKIRT K-band observations
  25. Swift UVOT correction to GCN 4455
  26. GRB 060109: Swift Detection of a long burst
  27. GRB 060108: a dark burst?
  28. GRB 060108: Refined XRT analysis
  29. GRB 060108: VLT J-band observations
  30. GRB 060108: Mitsume optical observations
  31. GRB 060108: Swift/UVOT upper limits
  32. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  33. GRB060108: SDSS pre-burst observations
  34. GRB060108: Faulkes Telescope observation
  35. GRB 060108: Refined analysis of the Swift-BAT burst
  36. GRB 060108: Swift XRT position
  37. GRB060108: Swift detection of its 100th GRB
  38. GRB 060105: pseudo-z from spectral parameters of the prompt emission
  39. GRB 060105: Radio observations
  40. GRB 060105: MDM Observation
  41. Konus-Wind observation of GRB 060105
  42. GRB 060105: ISAS observations and near IR upper limit
  43. GRB 060105: Swift/UVOT upper limits
  44. GRB 060105: Mitsume optical observations
  45. GRB 060105: BAT refined analysis
  46. GRB 060102 - no XRT afterglow
  47. GRB 060105: XRT refined analysis
  48. GRB060105: Suzaku-XIS and -HXD observation plan
  49. GRB060105, optical observation
  50. GRB060105 : Kiso optical observation
  51. GRB060105: Swift detection of a bright long burst
  52. Swift-BAT trigger 175653 is not an astrophysical source
  53. GRB 060102: MDM Observation
  54. Swift-BAT trigger 175653 is probably not a GRB
  55. GRB 060102: Swift-BAT refined analysis
  56. Time Correction to GRB 060102
  57. GRB 060102: Swift-BAT detection of a burst
  58. GRB051211B: optical observations
  59. GRB051227: SARA Observations
  60. GRB 051221B: Optical Observations with Kuiper 1.54m
  61. GRB 051227: Likely host galaxy underlying afterglow position
  62. GRB 051227: optical observation
  63. GRB 051221A: VLA Radio Observations
  64. GRB 051227: Confirmed fading from Gemini observations
  65. GRB051227: further analysis of VLT images
  66. GRB 051227: optical afterglow
  67. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  68. GRB 051227: Gemini observations
  69. GRB 051227: Keck Spectroscopy
  70. GRB 051227: Magellan r'-band Imaging/Astrometry
  71. GRB 051227: refined analysis of VLT images
  72. GRB 051227: P60 Observations
  73. GRB 051227: MDM Observation
  74. GRB 051227: R-band object in the XRT error circle
  75. GRB 051227: Joint Swift-HETE Spectral Analysis
  76. GRB 051227: XRT refined analysis
  77. GRB 051227: Further analysis of the Swift-BAT burst
  78. GRB 051227: Refined analysis of the Swift-BAT burst
  79. GRB051227: SDSS pre-burst observations
  80. GRB 051227, optical observation
  81. GRB 051227: Swift detection of a burst
  82. IBAS_alert n. 2719 : not a real GRB
  83. Konus-Wind observation of GRB 051221A
  84. GRB051221A: Suzaku WAM observation of the prompt emission
  85. GRB 051221A: MDM Optical Observations
  86. GRB051016: analysis of the XMM-Newton observation
  87. GRB 051221A: Detection at 251nm with Swift UVOT
  88. GRB 051221A: Chandra Afterglow Position
  89. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  90. GRB 051221B: ROTSE-III Optical Limits
  91. GRB 051221B: TAROT optical limits
  92. GRB 051221A: WSRT Radio Observations
  93. GRB 051221: Redshift from Gemini
  94. GRB 051221: Continued fading of optical afterglow
  95. GRB 051221B: Refined analysis of the Swift-BAT burst
  96. Possible GRB 051221B: MDM Optical Detection
  97. GRB 051221A: RAPTOR Fading Counterpart Constraint
  98. GRB 051221B: BOOTES optical observations.
  99. Possible GRB 051221B: Swift XRT position
  100. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral

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