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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"

32572 results found.

  1. GRB 070628: NIR detection of afterglow
  2. GRB 070628, Swift-BAT refined analysis
  3. GRB 070628: TAROT La Silla observatory optical observations
  4. GRB 070628: Swift XRT refined analysis
  5. GRB 070628: Watcher Observations
  6. GRB 070612A: Allen Telescope Array Observations
  7. INTEGRAL burst GRB070615: X-ray continued observations
  8. GRB 070616 : WIDGET simultaneous optical observations
  9. GRB 070616: Suzaku/WAM observation of the prompt emission
  10. GRB 070612A: Second Epoch WSRT Radio Observations
  11. GRB070621: RTT150 optical observations
  12. GRB 070621: VLT optical observations
  13. GRB 070621: Swift/UVOT Upper Limits
  14. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  15. GRB 070621: Swift-BAT refined analysis
  16. GRB070621: Swift XRT refined analysis
  17. GRB 070621: Gemini South optical imaging
  18. Observations of GRB070612A at Calar Alto
  19. GRB 070621: NOT observations
  20. GRB070621: OPTIMA-Burst optical upper limit
  21. GRB 070621: Watcher Observations
  22. GRB 070621: ROTSE-III Prompt Optical Limits
  23. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  24. GRB 070612A: TNG optical observations
  25. Swift/UVOT detection of GRB070616 optical afterglow.
  26. GRB070612A: Gemini Spectroscopic Redshift
  27. GRB 070612A: NOT observations
  28. GRB070616: Optical Observation by MITSuME Akeno
  29. GRB 070612B: Optical Observation by MITSuME Akeno
  30. GRB070616: Optical Observation by MITSuME Okayama
  31. GRB 070616, Swift-BAT further refined analysis
  32. GRB 070616: Swift XRT refined circular
  33. GRB 070612A: Possible WSRT Radio Detection
  34. Swift/UVOT observations of GRB070616
  35. GRB 070616: TLS observation
  36. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  37. GRB 070616, Swift-BAT partial refined analysis
  38. GRB 070612B: optical observations
  39. VLA upper limit on GRB 070610
  40. GRB 070615
  41. GRB 070612A: Super-LOTIS observations
  42. GRB 070612A: Rapid Decay
  43. GRB 070612A: Suzaku/WAM observation of the prompt emission
  44. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  45. GRB070612A: MITSuME Okayama Observation
  46. GRB 070612A: continued SARA observations
  47. GRB 070612A: spectral lag
  48. GRB 070611: Watcher Observations
  49. GRB 070612A: MDM Observations
  50. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  51. GRB 070612B: SARA upper limit
  52. GRB 070612B, Swift-BAT refined analysis
  53. GRB 070612A, Swift-BAT refined analysis
  54. GRB 070612B: Swift-XRT refined analysis
  55. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  56. GRB 070612B: Swift/UVOT upper limits
  57. GRB070612B: P60 Observations
  58. GRB 070612B: KAIT limits
  59. GRB 070612A: SARA detection of possible OT
  60. GRB 070612B: Swift XRT position from downlink data
  61. GRB 070610: MITSuME OAO optical upper limit
  62. GRB070612 - SDSS Pre-Burst Observations
  63. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  64. GRB 070610: SARA upper limit
  65. GRB 070610: Swift-XRT refined analysis
  66. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  67. GRB 070611: Swift/UVOT Observations
  68. GRB 070611: Swift-XRT refined analysis
  69. GRB 070611, Swift-BAT refined analysis
  70. GRB 070610: Watcher Observations
  71. GRB 070611: VLT redshift
  72. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  73. GRB 070611; Swift-XRT position
  74. GRB 070611: ROTSE-III Optical Limits
  75. GRB 070610: Swift-UVOT Upper Limits
  76. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  77. GRB 070610, Swift-BAT refined analysis
  78. GRB 070610; Swift-XRT position
  79. GRB 070411: TAROT Calern observatory optical observations
  80. GRB 070419A, deep LBT photometry and possible supernova detection
  81. GRB070520B: optical observations
  82. GRB070520: optical observation
  83. GRB070518: optical observation
  84. GRB070521: optical observation
  85. Swift/UVOT refined analysis of GRB070531
  86. GRB 070531: Swift-BAT refined analysis
  87. GRB 070531: Swift-XRT position
  88. GRB 070531: Liverpool Telescope Optical Observations
  89. GRB 070529: SARA upper limit
  90. Swift/UVOT refined analysis of GRB070529
  91. GRB 070529: MARGE Observations
  92. GRB 070529: Optical aterglow from MIRO
  93. GRB 070529: Gemini Redshift
  94. GRB 070529: Swift-XRT refined analysis
  95. GRB 070529, Swift-BAT refined analysis
  96. GRB 070529: Xinglong TNT Optical Upper Limit
  97. GRB 070412: Deep Keck imaging
  98. Swift Triggers 280447, 280450 and 280451 are invalid
  99. GRB 070518, deep LBT photometry
  100. GRB 070518: MARGE Observations

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