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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"

37682 results found.

  1. GRB 051227: optical afterglow
  2. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  3. GRB 051227: Gemini observations
  4. GRB 051227: Keck Spectroscopy
  5. GRB 051227: Magellan r'-band Imaging/Astrometry
  6. GRB 051227: refined analysis of VLT images
  7. GRB 051227: P60 Observations
  8. GRB 051227: MDM Observation
  9. GRB 051227: R-band object in the XRT error circle
  10. GRB 051227: Joint Swift-HETE Spectral Analysis
  11. GRB 051227: XRT refined analysis
  12. GRB 051227: Further analysis of the Swift-BAT burst
  13. GRB 051227: Refined analysis of the Swift-BAT burst
  14. GRB051227: SDSS pre-burst observations
  15. GRB 051227, optical observation
  16. GRB 051227: Swift detection of a burst
  17. IBAS_alert n. 2719 : not a real GRB
  18. Konus-Wind observation of GRB 051221A
  19. GRB051221A: Suzaku WAM observation of the prompt emission
  20. GRB 051221A: MDM Optical Observations
  21. GRB051016: analysis of the XMM-Newton observation
  22. GRB 051221A: Detection at 251nm with Swift UVOT
  23. GRB 051221A: Chandra Afterglow Position
  24. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  25. GRB 051221B: ROTSE-III Optical Limits
  26. GRB 051221B: TAROT optical limits
  27. GRB 051221A: WSRT Radio Observations
  28. GRB 051221: Redshift from Gemini
  29. GRB 051221: Continued fading of optical afterglow
  30. GRB 051221B: Refined analysis of the Swift-BAT burst
  31. Possible GRB 051221B: MDM Optical Detection
  32. GRB 051221A: RAPTOR Fading Counterpart Constraint
  33. GRB 051221B: BOOTES optical observations.
  34. Possible GRB 051221B: Swift XRT position
  35. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral
  36. Swift-BAT detection of a possible burst
  37. GRB 051221: Discovery of fading optical afterglow
  38. GRB 051221: Swift XRT refined analysis
  39. GRB 051221: Swift/UVOT upper limits
  40. GRB 051221: Possible nearby cluster
  41. GRB 051221: No variability in Gemini data
  42. GRB 051221: Correction to GCN #4368
  43. GRB 051221: Gemini observations
  44. GRB 051221: Improved astrometry of the IR counterpart
  45. GRB051221: K-band source
  46. GRB 051221: XRT position
  47. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  48. GRB 051221: IR Observations at GRB+1hr
  49. GRB 051221: Swift detection of a bright short burst
  50. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  51. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  52. GRB 051211B: optical afterglow
  53. Swift detection of an RS CVn flare star
  54. GRB051211A: possible optical candidate
  55. Swift Trigger 172767 is not a GRB
  56. GRB 051215: near-infrared observations
  57. GRB051215 - SDSS pre-burst observations
  58. GRB 051215: Swift detection of a possible burst
  59. GRB 051215: A short GRB in a cluster?
  60. GRB051105: optical observations
  61. GRB 051213: Swift-BAT refined analysis
  62. GRB 051211B, optical observation
  63. GRB 051213: Swift-BAT detection of a burst
  64. GRB 051211a: RTT150 optical observations
  65. GRB051211B, RBO optical observations
  66. GRB 051211A: Swift/UVOT upper limits
  67. GRB 051211B: Swift/UVOT upper limits - correction
  68. GRB 051211B: Swift/UVOT upper limits
  69. GRB 051211A,optical observation
  70. GRB 051211B: Swift XRT confirmation of the afterglow
  71. GRB051211B: Liverpool Telescope observation
  72. GRB 051211b: RTT150 optical observations
  73. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  74. GRB 051211B: Swift XRT Observations
  75. GRB 051210: Swift/UVOT upper limits
  76. GRB 051210: Magellan Imaging
  77. GRB 051211: TAROT optical limits
  78. GRB 051211B: a possible optical detection by TAROT
  79. GRB 051211B: a long GRB detected by INTEGRAL
  80. GRB 051211: Swift XRT upper limit
  81. GRB 051211:IAC80 optical observations
  82. HETE SXC localization of GRB 051211 (=H3979)
  83. GRB 051210: Optical imaging from Las Campanas
  84. GRB 051210: SALT detection limit
  85. GRB 051210: BAT further refined analysis of the short burst
  86. GRB 051210: Swift XRT refined analysis
  87. GRB 051210: FRAM early limit
  88. GRB 051210: Swift-BAT refined analysis of a short burst
  89. GRB 051210: A short GRB in a cluster?
  90. GRB 051210: Swift detection of a burst
  91. IPN observations of SGR1806-20
  92. An extraordinary long burst on December 3 from SGR1806-20
  93. IBAS Alert 2706 : not a real GRB
  94. GRB051117B: optical observation
  95. GRB051111: optical observaion
  96. Swift-BAT trigger 165579 is not a GRB
  97. GRB 051127: Swift-BAT detection of a possible burst
  98. GRB051117b: No Swift/UVOT Detection
  99. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  100. GRB 051117A: Swift/UVOT Detection of an Afterglow

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