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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"

15987 results found.

  1. GRB 060121 (=H4010): Results of preliminary spectral analysis
  2. GRB 060121: A bright short/hard GRB localized by HETE-2 SXC
  3. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  4. HETE Alert 4006: MASTER promt optical limit
  5. GRB060108: photometric redshift determination
  6. GRB 060117: FRAM refined analysis
  7. GRB 060117: FRAM optical afterglow candidate
  8. GRB 060116: VLT optical observations
  9. GRB060115: REM observations
  10. GRB 060116 : Lulin optical limit
  11. GRB 060116: ROTSE-III Optical Limits
  12. GRB 060115: absorption redshift
  13. GRB 060114: REM observations
  14. GRB 060115: Swift XRT refined analysis
  15. GRB 060115: OT finding chart
  16. GRB060115, optical observation
  17. GRB 060115: MITSuME optical afterglow candidate
  18. GRB060114, optical observation
  19. GRB 060108: IR observations of afterglow
  20. GRB 060108: Evidence for an XRT Position Offset
  21. GRB 060111B: Swift XRT refined analysis
  22. GRB 060111B: MITSuME detection of optical afterglow
  23. GRB 060111B: TAROT optical observation
  24. GRB060111A: RTT150 optical observations
  25. GRB060111B: RTT150, possible host galaxy
  26. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  27. GRB060111.2:_MASTER optical limit
  28. GRB 060111: TAROT optical observation
  29. GRB 060111: ROTSE-III Optical Limits
  30. GRB 060110: Mitsume optical observations
  31. GRB 060110a: RAPTOR detection of early optical emission.
  32. GRB 060110: ROTSE-III Confirmation of Optical Counterpart
  33. GRB060110, optical observation
  34. GRB 060110: Optical observation
  35. GRB 060110: Optical limit
  36. GRB060109, optical observation
  37. GRB060108: P200 Ks Observations
  38. GRB 060108: early UKIRT K-band observations
  39. GRB 060108: a dark burst?
  40. GRB 060108: Mitsume optical observations
  41. GRB060108: Faulkes Telescope observation
  42. GRB060108, optical observation
  43. GRB 060105: Mitsume optical observations
  44. GRB060105, optical observation
  45. GRB060105 : Kiso optical observation
  46. GRB051211B: optical observations
  47. GRB 051221B: Optical Observations with Kuiper 1.54m
  48. GRB 051227: optical observation
  49. GRB 051221A: VLA Radio Observations
  50. GRB051227: Radio Observations
  51. GRB 051227: optical afterglow
  52. GRB 051227: Joint Swift-HETE Spectral Analysis
  53. GRB 051227, optical observation
  54. GRB051117B: optical observation
  55. GRB 051221A: MDM Optical Observations
  56. GRB 051221A: Chandra Afterglow Position
  57. GRB 051221B: ROTSE-III Optical Limits
  58. GRB 051221B: TAROT optical limits
  59. GRB 051221A: WSRT Radio Observations
  60. GRB 051221: Continued fading of optical afterglow
  61. Possible GRB 051221B: MDM Optical Detection
  62. GRB 051221A: RAPTOR Fading Counterpart Constraint
  63. GRB 051221B: BOOTES optical observations.
  64. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral
  65. GRB 051221: Discovery of fading optical afterglow
  66. GRB 051221: Possible nearby cluster
  67. GRB 051221: IR Observations at GRB+1hr
  68. GRB051211A (=H3979): Refined Analysis
  69. GRB 051211B: optical afterglow
  70. GRB051211A: possible optical candidate
  71. GRB051105: optical observations
  72. GRB 051211B, optical observation
  73. GRB 051211a: RTT150 optical observations
  74. GRB051211B, RBO optical observations
  75. GRB 051211A: Swift/UVOT upper limits
  76. GRB 051211A,optical observation
  77. GRB 051211B: Swift XRT confirmation of the afterglow
  78. GRB051211B: Liverpool Telescope observation
  79. GRB 051211b: RTT150 optical observations
  80. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  81. GRB 051211B: Swift XRT Observations
  82. GRB 051211: TAROT optical limits
  83. GRB 051211B: a possible optical detection by TAROT
  84. GRB 051211:IAC80 optical observations
  85. HETE SXC localization of GRB 051211 (=H3979)
  86. GRB 051210: Optical imaging from Las Campanas
  87. GRB051210: Swift UVOT Observation
  88. GRB051117B: optical observation
  89. GRB051111: optical observaion
  90. GRB051117b: No Swift/UVOT Detection
  91. GRB051111: Rc optical observations: correction
  92. GRB051111: Rc optical observations
  93. GRB 051109B: GAO 150cm telescope Optical limit
  94. GRB 051109A : GAO 150cm telescope Rc-band detection
  95. GRB 051021 Optical Observations
  96. GRB 051117B: MARGE Optical Limits
  97. GRB 051117B,optical observation
  98. GRB 051117B: Optical observations
  99. GRB 051117B: ROTSE-III Optical Limits
  100. GRB 051028 Optical Observations

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