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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

20957 results found.

  1. GRB 051227: optical afterglow
  2. GRB 051227: Gemini observations
  3. GRB 051227: Magellan r'-band Imaging/Astrometry
  4. GRB 051227: P60 Observations
  5. GRB 051227: R-band object in the XRT error circle
  6. GRB 051227: Further analysis of the Swift-BAT burst
  7. GRB051227: SDSS pre-burst observations
  8. GRB051117B: optical observation
  9. GRB 051221A: MDM Optical Observations
  10. GRB 051221B: TAROT optical limits
  11. GRB 051221A: WSRT Radio Observations
  12. GRB 051221: Continued fading of optical afterglow
  13. GRB 051221B: BOOTES optical observations.
  14. GRB 051221: Correction to GCN #4368
  15. GRB 051221: Gemini observations
  16. GRB 051221: IR Observations at GRB+1hr
  17. GRB 051211B: optical afterglow
  18. GRB051211A: possible optical candidate
  19. GRB 051215: near-infrared observations
  20. GRB051215 - SDSS pre-burst observations
  21. GRB051211B: Probable radio afterglow
  22. GRB051105: optical observations
  23. GRB 051211a: RTT150 optical observations
  24. GRB051211B, RBO optical observations
  25. GRB 051211B: Swift/UVOT upper limits - correction
  26. GRB 051211B: Swift/UVOT upper limits
  27. GRB 051211B: Swift XRT confirmation of the afterglow
  28. GRB 051211b: RTT150 optical observations
  29. GRB051211b: P60 Observations
  30. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  31. GRB 051211B: Swift XRT Observations
  32. GRB 051210: Swift/UVOT upper limits
  33. GRB 051210: Magellan Imaging
  34. GRB 051211: TAROT optical limits
  35. GRB 051211B: a possible optical detection by TAROT
  36. GRB 051211: Swift XRT upper limit
  37. GRB 051211:IAC80 optical observations
  38. GRB 051210: BAT further refined analysis of the short burst
  39. IPN observations of SGR1806-20
  40. GRB051111: Rc optical observations: correction
  41. GRB051111: Rc optical observations
  42. GRB 051021 Optical Observations
  43. GRB 051117A and B: Radio Observations
  44. GRB 051117B: R and I observations of possible host galaxy
  45. GRB 051117b: NIR observations
  46. GRB051117A : XRT refined analysis
  47. GRB 051117B: Optical observations
  48. GRB 051117B: ROTSE-III Optical Limits
  49. GRB 051028 Optical Observations
  50. GRB 051114: Radio Observations
  51. GRB051109A optical observations
  52. GRB 051111: Radio afterglow
  53. GRB 051111: AEOS optical observations
  54. GRB051103: Radio Observations
  55. GRB 051109A Milagro GeV/TeV Observations
  56. GRB051111: Swift/UVOT Observations
  57. GRB 051111A : R-band temporal decay index based on Lulin
  58. GRB051111: XRT preliminary analysis
  59. GRB 051109A Optical Observations
  60. GRB051111a: SARA Observations
  61. GRB 051111a: IR photometry
  62. GRB 051111A: KAIT optical observations
  63. GRB051111: Super-LOTIS Early Detection
  64. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  65. Faulkes Telescope R-band detection of GRB051111
  66. GRB 051103 Milagro GeV/TeV Observations
  67. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  68. GRB 051008 Tautenburg Supernova Search
  69. GRB 051109B. Radio Observations
  70. GRB051109A - radio observations
  71. GRB 051109A: KAIT optical observations
  72. GRB 051109A: Swift-UVOT Observations
  73. GRB051109B: XRT refined analysis
  74. GRB 051109B : Lulin Optical Observations
  75. GRB051109A: XRT refined analysis
  76. GRB 051109B: Super-LOTIS Observations
  77. GRB 051109B Kiso optical follow-up observation
  78. GRB 051109B: Swift detection of a burst
  79. GRB 051109: PROMPT Detections
  80. GRB 051109: Rc and Ic observations
  81. GRB051109: Early Super-LOTIS Detection
  82. GRB 051109a: IR Photometry and Astrometry
  83. GRB 051109a: MDM Observations
  84. GRB 051109a: IR Detections
  85. GRB 051109: ROTSE-III Detection of Possible Counterpart
  86. GRB051103: optical observations
  87. GRB 051103, optical observations
  88. GRB051103: MASTER: OT limit and host galaxy candidates
  89. GRB051028: Swift-XRT refined analysis
  90. GRB 051105A, 2nd epoch optical observations
  91. GRB 051105a: MDM Observations
  92. GRB 051105A: TNG optical observations
  93. GRB051105A: Swift/UVOT Observations
  94. GRB 051105A, radio observations
  95. GRB 051105A, optical observations
  96. XRT observations of GRB 051105A
  97. GRB051028:MASTER correction and final results
  98. GRB 051022: RTT150 optical observations
  99. GRB 051021A: RTT150 optical observations
  100. GRB051028 SARA Observation

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