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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"

32756 results found.

  1. GRB 070621: Gemini South optical imaging
  2. Observations of GRB070612A at Calar Alto
  3. GRB 070621: NOT observations
  4. GRB070621: OPTIMA-Burst optical upper limit
  5. GRB 070621: Watcher Observations
  6. GRB 070621: ROTSE-III Prompt Optical Limits
  7. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  8. GRB 070612A: TNG optical observations
  9. Swift/UVOT detection of GRB070616 optical afterglow.
  10. GRB070612A: Gemini Spectroscopic Redshift
  11. GRB 070612A: NOT observations
  12. GRB070616: Optical Observation by MITSuME Akeno
  13. GRB 070612B: Optical Observation by MITSuME Akeno
  14. GRB070616: Optical Observation by MITSuME Okayama
  15. GRB 070616, Swift-BAT further refined analysis
  16. GRB 070616: Swift XRT refined circular
  17. GRB 070612A: Possible WSRT Radio Detection
  18. Swift/UVOT observations of GRB070616
  19. GRB 070616: TLS observation
  20. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  21. GRB 070616, Swift-BAT partial refined analysis
  22. GRB 070612B: optical observations
  23. VLA upper limit on GRB 070610
  24. GRB 070615
  25. GRB 070612A: Super-LOTIS observations
  26. GRB 070612A: Rapid Decay
  27. GRB 070612A: Suzaku/WAM observation of the prompt emission
  28. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  29. GRB070612A: MITSuME Okayama Observation
  30. GRB 070612A: continued SARA observations
  31. GRB 070612A: spectral lag
  32. GRB 070611: Watcher Observations
  33. GRB 070612A: MDM Observations
  34. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  35. GRB 070612B: SARA upper limit
  36. GRB 070612B, Swift-BAT refined analysis
  37. GRB 070612A, Swift-BAT refined analysis
  38. GRB 070612B: Swift-XRT refined analysis
  39. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  40. GRB 070612B: Swift/UVOT upper limits
  41. GRB070612B: P60 Observations
  42. GRB 070612B: KAIT limits
  43. GRB 070612A: SARA detection of possible OT
  44. GRB 070612B: Swift XRT position from downlink data
  45. GRB 070610: MITSuME OAO optical upper limit
  46. GRB070612 - SDSS Pre-Burst Observations
  47. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  48. GRB 070610: SARA upper limit
  49. GRB 070610: Swift-XRT refined analysis
  50. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  51. GRB 070611: Swift/UVOT Observations
  52. GRB 070611: Swift-XRT refined analysis
  53. GRB 070611, Swift-BAT refined analysis
  54. GRB 070610: Watcher Observations
  55. GRB 070611: VLT redshift
  56. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  57. GRB 070611; Swift-XRT position
  58. GRB 070611: ROTSE-III Optical Limits
  59. GRB 070610: Swift-UVOT Upper Limits
  60. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  61. GRB 070610, Swift-BAT refined analysis
  62. GRB 070610; Swift-XRT position
  63. GRB 070411: TAROT Calern observatory optical observations
  64. GRB 070419A, deep LBT photometry and possible supernova detection
  65. GRB070520B: optical observations
  66. GRB070520: optical observation
  67. GRB070518: optical observation
  68. GRB070521: optical observation
  69. Swift/UVOT refined analysis of GRB070531
  70. GRB 070531: Swift-BAT refined analysis
  71. GRB 070531: Swift-XRT position
  72. GRB 070531: Liverpool Telescope Optical Observations
  73. GRB 070529: SARA upper limit
  74. Swift/UVOT refined analysis of GRB070529
  75. GRB 070529: MARGE Observations
  76. GRB 070529: Optical aterglow from MIRO
  77. GRB 070529: Gemini Redshift
  78. GRB 070529: Swift-XRT refined analysis
  79. GRB 070529, Swift-BAT refined analysis
  80. GRB 070529: Xinglong TNT Optical Upper Limit
  81. GRB 070412: Deep Keck imaging
  82. Swift Triggers 280447, 280450 and 280451 are invalid
  83. GRB 070518, deep LBT photometry
  84. GRB 070518: MARGE Observations
  85. Konus-Wind observation of GRB 070521
  86. GRB 070518: optical observation
  87. GRB070521: Second Epoch Gemini Imaging
  88. GRB070521: NIR observations
  89. GRB070520B: NIR observations
  90. GRB 070521: Swift/UVOT Upper Limits
  91. GRB 070521, optical observation
  92. GRB 070521: Swift-XRT refined analysis
  93. GRB 070521: Keck imaging
  94. GRB070521: Gemini Observations
  95. GROND upper limits of GRB 070521
  96. GRB 070521 Milagro GeV/TeV Observations
  97. GRB 070520B: SARA upper limit
  98. GRB 070520A: SARA upper limit
  99. GRB 070521: SARA upper limit
  100. GRB 070521: Subaru observations and possible host detection

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