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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"

28092 results found.

  1. OT20050728 was not an optical GRB afterglow
  2. GRB 070616 : WIDGET simultaneous optical observations
  3. GRB 070616: Suzaku/WAM observation of the prompt emission
  4. GRB070621: RTT150 optical observations
  5. GRB 070621: VLT optical observations
  6. GRB 070621: Swift/UVOT Upper Limits
  7. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  8. GRB 070621: Swift-BAT refined analysis
  9. GRB070621: Swift XRT refined analysis
  10. GRB 070621: Gemini South optical imaging
  11. GRB 070621: UVOT-enhanced XRT position
  12. Observations of GRB070612A at Calar Alto
  13. GRB 070621: NOT observations
  14. GRB070621: OPTIMA-Burst optical upper limit
  15. GRB 070621: TAROT Calern observatory optical observations
  16. GRB 070621: Watcher Observations
  17. GRB 070621: Swift detection of a burst
  18. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  19. Swift/UVOT detection of GRB070616 optical afterglow.
  20. GRB 070612A: NOT observations
  21. GRB070616: Optical Observation by MITSuME Okayama
  22. GRB 070616, Swift-BAT further refined analysis
  23. GRB 070616: BTA optical observations
  24. GRB 070616: TLS observation
  25. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  26. GRB 070616: Swift detection of a burst
  27. GRB 070612B: optical observations
  28. UVOT Observations of INTEGRAL burst GRB070615
  29. VLA upper limit on GRB 070610
  30. GRB 070615
  31. SWIFT J195509.6+261406 (GRB 070610): further observations
  32. GRB 070612A: Super-LOTIS observations
  33. GRB 070612A: Rapid Decay
  34. GRB 070612A: Suzaku/WAM observation of the prompt emission
  35. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  36. GRB070612A: MITSuME Okayama Observation
  37. GRB 070612A: continued SARA observations
  38. GRB 070611: Watcher Observations
  39. Swift Trigger 282176 is Cygnus X-1
  40. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  41. GRB 070612B: SARA upper limit
  42. GRB 070612B, Swift-BAT refined analysis
  43. GRB 070612A, Swift-BAT refined analysis
  44. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  45. GRB 070612B: Swift/UVOT upper limits
  46. GRB 070612B: FRAM limit
  47. GRB070612B: P60 Observations
  48. GRB 070612A: SARA detection of possible OT
  49. GRB 070610: TAROT Calern observatory optical observations
  50. GRB 070610: MITSuME OAO optical upper limit
  51. GRB070612 - SDSS Pre-Burst Observations
  52. GRB 070612: Swift detection of a burst
  53. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  54. GRB 070610: SARA upper limit
  55. GRB 070610: Swift-XRT refined analysis
  56. GRB 070611: Swift/UVOT Observations
  57. GRB 070611: Swift-XRT refined analysis
  58. GRB 070611, Swift-BAT refined analysis
  59. GRB 070610: Optical observations from OSN
  60. GRB 070610: Watcher Observations
  61. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  62. GRB 070611: ROTSE-III Optical Limits
  63. GRB 070610: Swift-UVOT Upper Limits
  64. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  65. GRB 070610, Swift-BAT refined analysis
  66. GRB 070412: TAROT Calern observatory optical observations
  67. GRB 070411: TAROT Calern observatory optical observations
  68. GRB070520B: optical observations
  69. GRB070520: optical observation
  70. GRB070518: optical observation
  71. GRB070521: optical observation
  72. GRB 070531: NOT nIR observations
  73. GRB 070531: Swift-BAT refined analysis
  74. GRB 070531: I-band observations from IAC80
  75. GRB 070531: Liverpool Telescope Optical Observations
  76. GRB 070529: SARA upper limit
  77. Swift/UVOT refined analysis of GRB070529
  78. GRB 070529: Optical aterglow from MIRO
  79. GRB 070529: Swift-XRT refined analysis
  80. GRB 070529, Swift-BAT refined analysis
  81. GRB 070529: Xinglong TNT Optical Upper Limit
  82. GRB 070529: Swift detection of a burst with an optical aterglow
  83. GRB 070412: Deep Keck imaging
  84. Swift trigger 280447 is probably a Galactic transient
  85. GRB 070518, deep LBT photometry
  86. Konus-Wind observation of GRB 070521
  87. GRB070521: Second Epoch Gemini Imaging
  88. GRB 070521: Swift/UVOT Upper Limits
  89. GRB 070521, optical observation
  90. GRB 070521: Swift-XRT refined analysis
  91. GRB 070521: Keck imaging
  92. GRB070521: Gemini Observations
  93. GROND upper limits of GRB 070521
  94. GRB 070520B: SARA upper limit
  95. GRB 070520A: SARA upper limit
  96. GRB 070521: SARA upper limit
  97. GRB 070521: Subaru observations and possible host detection
  98. GRB 070520B: Swift/UVOT Upper Limits
  99. GRB 070520A: Subaru Observations
  100. GRB 070521, Swift-BAT refined analysis

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