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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"

43000 results found.

  1. GRB 051227: Gemini observations
  2. GRB 051227: Keck Spectroscopy
  3. GRB 051227: Magellan r'-band Imaging/Astrometry
  4. GRB 051227: refined analysis of VLT images
  5. GRB 051227: P60 Observations
  6. GRB 051227: R-band object in the XRT error circle
  7. GRB 051227: Joint Swift-HETE Spectral Analysis
  8. GRB 051227: XRT refined analysis
  9. GRB 051227: Further analysis of the Swift-BAT burst
  10. GRB 051227: Refined analysis of the Swift-BAT burst
  11. GRB051227: SDSS pre-burst observations
  12. GRB 051227: Swift detection of a burst
  13. GRB051117B: optical observation
  14. IBAS_alert n. 2719 : not a real GRB
  15. Konus-Wind observation of GRB 051221A
  16. GRB051221A: Suzaku WAM observation of the prompt emission
  17. GRB 051221A: MDM Optical Observations
  18. GRB051016: analysis of the XMM-Newton observation
  19. GRB 051221A: Detection at 251nm with Swift UVOT
  20. GRB 051221A: Chandra Afterglow Position
  21. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  22. GRB 051221B: ROTSE-III Optical Limits
  23. GRB 051221B: TAROT optical limits
  24. GRB 051221A: WSRT Radio Observations
  25. GRB 051221: Redshift from Gemini
  26. GRB 051221: Continued fading of optical afterglow
  27. GRB 051221A: RAPTOR Fading Counterpart Constraint
  28. GRB 051221B: BOOTES optical observations.
  29. Possible GRB 051221B: Swift XRT position
  30. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral
  31. Swift-BAT detection of a possible burst
  32. GRB 051221: Discovery of fading optical afterglow
  33. GRB 051221: Swift XRT refined analysis
  34. GRB 051221: Possible nearby cluster
  35. GRB 051221: No variability in Gemini data
  36. GRB 051221: Correction to GCN #4368
  37. GRB 051221: Improved astrometry of the IR counterpart
  38. GRB051221: K-band source
  39. GRB 051221: XRT position
  40. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  41. GRB 051221: IR Observations at GRB+1hr
  42. GRB 051221: Swift detection of a bright short burst
  43. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  44. GRB051211A (=H3979): Refined Analysis
  45. GRB 051211B: optical afterglow
  46. Swift detection of an RS CVn flare star
  47. Swift Trigger 172767 is not a GRB
  48. GRB 051215: near-infrared observations
  49. GRB051215 - SDSS pre-burst observations
  50. GRB 051215: Swift detection of a possible burst
  51. GRB 051215: A short GRB in a cluster?
  52. GRB051105: optical observations
  53. GRB 051213: Swift-BAT refined analysis
  54. GRB051211B: XRT refined analysis
  55. GRB 051213: Swift-BAT detection of a burst
  56. GRB 051211a: RTT150 optical observations
  57. GRB051211B, RBO optical observations
  58. GRB 051211B: Swift XRT confirmation of the afterglow
  59. GRB051211B: Liverpool Telescope observation
  60. GRB 051211b: RTT150 optical observations
  61. GRB051211b: P60 Observations
  62. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  63. GRB 051211B: Swift XRT Observations
  64. GRB 051210: Magellan Imaging
  65. GRB 051211: TAROT optical limits
  66. GRB 051211B: a possible optical detection by TAROT
  67. GRB 051211B: a long GRB detected by INTEGRAL
  68. GRB 051211: Swift XRT upper limit
  69. GRB 051211:IAC80 optical observations
  70. HETE SXC localization of GRB 051211 (=H3979)
  71. GRB 051210: Optical imaging from Las Campanas
  72. GRB 051210: SALT detection limit
  73. GRB 051210: BAT further refined analysis of the short burst
  74. GRB 051210: Swift XRT refined analysis
  75. GRB 051210: FRAM early limit
  76. GRB 051210: A short GRB in a cluster?
  77. GRB 051210: Swift detection of a burst
  78. IPN observations of SGR1806-20
  79. Swift XRT positions
  80. An extraordinary long burst on December 3 from SGR1806-20
  81. IBAS Alert 2706 : not a real GRB
  82. Possible resuming of the SGR 1806-20 activity
  83. Swift-BAT trigger 165579 is not a GRB
  84. GRB 051127: Swift-BAT detection of a possible burst
  85. GRB051117B: Swift XRT refined analysis
  86. GRB051117b: No Swift/UVOT Detection
  87. GRB051111: Rc optical observations: correction
  88. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  89. GRB051111: Suzaku WAM observation of the prompt emission
  90. GRB051111: Rc optical observations
  91. GRB051008: Suzaku WAM observation of the prompt emission
  92. GRB 051109B: GAO 150cm telescope Optical limit
  93. GRB 051109A : GAO 150cm telescope Rc-band detection
  94. GRB 051021 Optical Observations
  95. GRB 051117B: MARGE Optical Limits
  96. GRB 051117A and B: Radio Observations
  97. GRB 051117B: R and I observations of possible host galaxy
  98. GRB 051117b: NIR observations
  99. GRB 051117A: Refined analysis of the Swift-BAT burst
  100. GRB051117A : XRT refined analysis

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