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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"

26483 results found.

  1. GRB 060110: UKIRT K-band observations
  2. GRB 060110: ROTSE-III Confirmation of Optical Counterpart
  3. GRB 060110: IR Candidate Afterglow
  4. GRB 060110: Super-LOTIS observations
  5. GRB 060110: Optical limit
  6. GRB 060109: Refined Swift-XRT analysis
  7. GRB 060109: Swift/UVOT upper limits
  8. GRB060108: P200 Ks Observations
  9. GRB 060108: early UKIRT K-band observations
  10. GRB 060109: Swift Detection of a long burst
  11. GRB 060108: a dark burst?
  12. GRB 060108: Refined XRT analysis
  13. GRB 060108: Mitsume optical observations
  14. GRB060108: SDSS pre-burst observations
  15. GRB060108: Faulkes Telescope observation
  16. GRB060108: Swift detection of its 100th GRB
  17. GRB 060105: pseudo-z from spectral parameters of the prompt emission
  18. GRB 060105: Radio observations
  19. Konus-Wind observation of GRB 060105
  20. GRB 060105: BAT refined analysis
  21. GRB 060102 - no XRT afterglow
  22. GRB 060105: XRT refined analysis
  23. Swift-BAT trigger 175653 is not an astrophysical source
  24. GRB 060102: Swift-BAT refined analysis
  25. Time Correction to GRB 060102
  26. GRB051211B: optical observations
  27. GRB 051221B: Optical Observations with Kuiper 1.54m
  28. GRB 051227: optical observation
  29. GRB051221B: Radio observations
  30. GRB 051221A: VLA Radio Observations
  31. GRB051227: Radio Observations
  32. GRB 051227: Confirmed fading from Gemini observations
  33. GRB 051227: optical afterglow
  34. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  35. GRB 051227: Gemini observations
  36. GRB 051227: Magellan r'-band Imaging/Astrometry
  37. GRB 051227: refined analysis of VLT images
  38. GRB 051227: P60 Observations
  39. GRB 051227: R-band object in the XRT error circle
  40. GRB 051227: Joint Swift-HETE Spectral Analysis
  41. GRB 051227: Further analysis of the Swift-BAT burst
  42. GRB 051227: Swift detection of a burst
  43. Konus-Wind observation of GRB 051221A
  44. GRB051221A: Suzaku WAM observation of the prompt emission
  45. GRB 051221A: MDM Optical Observations
  46. GRB051016: analysis of the XMM-Newton observation
  47. GRB 051221A: Detection at 251nm with Swift UVOT
  48. GRB 051221A: Chandra Afterglow Position
  49. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  50. GRB 051221B: TAROT optical limits
  51. GRB 051221: Continued fading of optical afterglow
  52. GRB 051221A: RAPTOR Fading Counterpart Constraint
  53. GRB 051221B: BOOTES optical observations.
  54. GRB 051221: Discovery of fading optical afterglow
  55. GRB051221: K-band source
  56. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  57. GRB 051221: Swift detection of a bright short burst
  58. Refined analysis of the SWIFT J1626.6-5156
  59. GRB051211A (=H3979): Refined Analysis
  60. GRB 051211B: optical afterglow
  61. GRB051211A: possible optical candidate
  62. Swift Trigger 172767 is not a GRB
  63. GRB 051215: near-infrared observations
  64. GRB051215 - SDSS pre-burst observations
  65. GRB 051215: Swift detection of a possible burst
  66. GRB051211B: Probable radio afterglow
  67. GRB051105: optical observations
  68. GRB 051211B, optical observation
  69. GRB 051213: Swift-BAT detection of a burst
  70. GRB051211B, RBO optical observations
  71. GRB 051211B: Swift XRT confirmation of the afterglow
  72. GRB051211B: Liverpool Telescope observation
  73. GRB 051211b: RTT150 optical observations
  74. GRB051211b: P60 Observations
  75. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  76. GRB 051211B: Swift XRT Observations
  77. GRB 051210: Magellan Imaging
  78. GRB 051211: TAROT optical limits
  79. GRB 051211B: a possible optical detection by TAROT
  80. GRB 051211B: a long GRB detected by INTEGRAL
  81. GRB 051210: Swift XRT refined analysis
  82. GRB 051210: FRAM early limit
  83. Swift XRT positions
  84. An extraordinary long burst on December 3 from SGR1806-20
  85. Possible resuming of the SGR 1806-20 activity
  86. GRB051117B: optical observation
  87. GRB051117B: Swift XRT refined analysis
  88. GRB051111: Rc optical observations: correction
  89. GRB 051117A: Swift/UVOT Detection of an Afterglow
  90. GRB051111: Suzaku WAM observation of the prompt emission
  91. GRB051111: Rc optical observations
  92. GRB051008: Suzaku WAM observation of the prompt emission
  93. GRB 051109A : GAO 150cm telescope Rc-band detection
  94. GRB 051021 Optical Observations
  95. GRB 051117A and B: Radio Observations
  96. GRB 051117B: R and I observations of possible host galaxy
  97. GRB051117A : XRT refined analysis
  98. GRB 051117B,optical observation
  99. GRB 051117B: Optical observations
  100. GRB 051117B: ROTSE-III Optical Limits

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