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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"

39364 results found.

  1. GRB 051227: XRT refined analysis
  2. GRB 051227: Further analysis of the Swift-BAT burst
  3. GRB 051227: Refined analysis of the Swift-BAT burst
  4. GRB051227: SDSS pre-burst observations
  5. GRB 051227, optical observation
  6. GRB 051227: Swift detection of a burst
  7. IBAS_alert n. 2719 : not a real GRB
  8. Konus-Wind observation of GRB 051221A
  9. GRB051221A: Suzaku WAM observation of the prompt emission
  10. GRB 051221A: MDM Optical Observations
  11. GRB051016: analysis of the XMM-Newton observation
  12. GRB 051221A: Detection at 251nm with Swift UVOT
  13. GRB 051221A: Chandra Afterglow Position
  14. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  15. GRB 051221B: ROTSE-III Optical Limits
  16. GRB 051221B: TAROT optical limits
  17. GRB 051221A: WSRT Radio Observations
  18. GRB 051221: Redshift from Gemini
  19. GRB 051221: Continued fading of optical afterglow
  20. GRB 051221B: Refined analysis of the Swift-BAT burst
  21. Possible GRB 051221B: MDM Optical Detection
  22. GRB 051221A: RAPTOR Fading Counterpart Constraint
  23. GRB 051221B: BOOTES optical observations.
  24. Possible GRB 051221B: Swift XRT position
  25. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral
  26. Swift-BAT detection of a possible burst
  27. GRB 051221: Discovery of fading optical afterglow
  28. GRB 051221: Swift XRT refined analysis
  29. GRB 051221: Swift/UVOT upper limits
  30. GRB 051221: Possible nearby cluster
  31. GRB 051221: No variability in Gemini data
  32. GRB 051221: Correction to GCN #4368
  33. GRB 051221: Gemini observations
  34. GRB 051221: Improved astrometry of the IR counterpart
  35. GRB051221: K-band source
  36. GRB 051221: XRT position
  37. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  38. GRB 051221: IR Observations at GRB+1hr
  39. GRB 051221: Swift detection of a bright short burst
  40. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  41. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  42. GRB 051211B: optical afterglow
  43. Swift detection of an RS CVn flare star
  44. GRB051211A: possible optical candidate
  45. Swift Trigger 172767 is not a GRB
  46. GRB 051215: near-infrared observations
  47. GRB051215 - SDSS pre-burst observations
  48. GRB 051215: Swift detection of a possible burst
  49. GRB 051215: A short GRB in a cluster?
  50. GRB051211B: Probable radio afterglow
  51. GRB051105: optical observations
  52. GRB 051213: Swift-BAT refined analysis
  53. GRB 051211B, optical observation
  54. GRB 051213: Swift-BAT detection of a burst
  55. GRB 051211a: RTT150 optical observations
  56. GRB051211B, RBO optical observations
  57. GRB 051211A: Swift/UVOT upper limits
  58. GRB 051211B: Swift/UVOT upper limits - correction
  59. GRB 051211B: Swift/UVOT upper limits
  60. GRB 051211A,optical observation
  61. GRB 051211B: Swift XRT confirmation of the afterglow
  62. GRB051211B: Liverpool Telescope observation
  63. GRB 051211b: RTT150 optical observations
  64. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  65. GRB 051211B: Swift XRT Observations
  66. GRB 051210: Swift/UVOT upper limits
  67. GRB 051210: Magellan Imaging
  68. GRB 051211: TAROT optical limits
  69. GRB 051211B: a possible optical detection by TAROT
  70. GRB 051211B: a long GRB detected by INTEGRAL
  71. GRB 051211: Swift XRT upper limit
  72. GRB 051211:IAC80 optical observations
  73. HETE SXC localization of GRB 051211 (=H3979)
  74. GRB 051210: Optical imaging from Las Campanas
  75. GRB 051210: SALT detection limit
  76. GRB 051210: BAT further refined analysis of the short burst
  77. GRB 051210: Swift XRT refined analysis
  78. GRB 051210: FRAM early limit
  79. GRB 051210: Swift-BAT refined analysis of a short burst
  80. GRB 051210: A short GRB in a cluster?
  81. GRB 051210: Swift detection of a burst
  82. IPN observations of SGR1806-20
  83. An extraordinary long burst on December 3 from SGR1806-20
  84. IBAS Alert 2706 : not a real GRB
  85. GRB051117B: optical observation
  86. GRB051111: optical observaion
  87. Swift-BAT trigger 165579 is not a GRB
  88. GRB 051127: Swift-BAT detection of a possible burst
  89. GRB051117b: No Swift/UVOT Detection
  90. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  91. GRB 051117A: Swift/UVOT Detection of an Afterglow
  92. GRB051111: Suzaku WAM observation of the prompt emission
  93. GRB051008: Suzaku WAM observation of the prompt emission
  94. GRB 051109B: GAO 150cm telescope Optical limit
  95. GRB 051109A : GAO 150cm telescope Rc-band detection
  96. GRB 051021 Optical Observations
  97. GRB 051117B: MARGE Optical Limits
  98. GRB 051117A and B: Radio Observations
  99. GRB 051117B: R and I observations of possible host galaxy
  100. GRB 051117b: NIR observations

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