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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"

27325 results found.

  1. GRB 070714B: Swift/UVOT Upper Limits
  2. GRB 070714B: confirmation of optical afterglow
  3. GRB 070616: No Evidence for I Band Afterglow
  4. GRB 070714A: Swift XRT refined analysis
  5. GRB070714B: Swift-XRT refined analysis
  6. GRB 070707: Swift-XRT follow-up observations
  7. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  8. GRB 070714A, Swift-BAT refined analysis
  9. GRB 070714 : Liverpool Telescope optical counterpart ?
  10. GRB 070714: Swift detection of a bright burst, possibly short
  11. SN 2007bg - off-axis GRB?
  12. GRB 070704: RTT150 optical observations
  13. GRB 070704: Suzaku/WAM observation of the prompt emission
  14. Konus-Wind observation of GRB 070707
  15. GRB 070707: optical afterglow
  16. Swift/UVOT Observations of GRB070707
  17. Swift XRT observation of GRB 070707
  18. GRB 070707: VLT observations
  19. GRB070704: FAVOR optical observations
  20. GRB 070704 : Liverpool Telescope Observations
  21. GRB 070611: VLT observations
  22. VLA detection of GRB 070612A in C Band
  23. GRB 070704: Swift-XRT refined analysis
  24. Swift/UVOT Observations of GRB070704
  25. GRB 070704, Swift-BAT refined analysis
  26. GRB 070704: Correction to GCN Circ 6594
  27. GRB 070704: Swift detection of a burst
  28. GRB 070626: Suzaku/WAM observation of the prompt emission
  29. GRB 070628 Swift-UVOT Refined Analysis
  30. GRB 070628: NIR detection of afterglow
  31. GRB 070628, Swift-BAT refined analysis
  32. GRB 070628: TAROT La Silla observatory optical observations
  33. Swift UVOT Observations of GRB 070628
  34. OT20050728 was not an optical GRB afterglow
  35. GRB 070616 : WIDGET simultaneous optical observations
  36. GRB 070616: Suzaku/WAM observation of the prompt emission
  37. GRB070621: RTT150 optical observations
  38. GRB 070621: VLT optical observations
  39. GRB 070621: Swift/UVOT Upper Limits
  40. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  41. GRB 070621: Swift-BAT refined analysis
  42. GRB070621: Swift XRT refined analysis
  43. GRB 070621: Gemini South optical imaging
  44. GRB 070621: UVOT-enhanced XRT position
  45. Observations of GRB070612A at Calar Alto
  46. GRB 070621: NOT observations
  47. GRB070621: OPTIMA-Burst optical upper limit
  48. GRB 070621: TAROT Calern observatory optical observations
  49. GRB 070621: Watcher Observations
  50. GRB 070621: Swift detection of a burst
  51. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  52. Swift/UVOT detection of GRB070616 optical afterglow.
  53. GRB 070612A: NOT observations
  54. GRB070616: Optical Observation by MITSuME Okayama
  55. GRB 070616, Swift-BAT further refined analysis
  56. GRB 070616: BTA optical observations
  57. GRB 070616: TLS observation
  58. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  59. GRB 070616: Swift detection of a burst
  60. GRB 070612B: optical observations
  61. UVOT Observations of INTEGRAL burst GRB070615
  62. VLA upper limit on GRB 070610
  63. GRB 070615
  64. SWIFT J195509.6+261406 (GRB 070610): further observations
  65. GRB 070612A: Super-LOTIS observations
  66. GRB 070612A: Rapid Decay
  67. GRB 070612A: Suzaku/WAM observation of the prompt emission
  68. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  69. GRB070612A: MITSuME Okayama Observation
  70. GRB 070612A: continued SARA observations
  71. GRB 070611: Watcher Observations
  72. Swift Trigger 282176 is Cygnus X-1
  73. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  74. GRB 070612B: SARA upper limit
  75. GRB 070612B, Swift-BAT refined analysis
  76. GRB 070612A, Swift-BAT refined analysis
  77. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  78. GRB 070612B: Swift/UVOT upper limits
  79. GRB 070612B: FRAM limit
  80. GRB070612B: P60 Observations
  81. GRB 070612A: SARA detection of possible OT
  82. GRB 070610: TAROT Calern observatory optical observations
  83. GRB 070610: MITSuME OAO optical upper limit
  84. GRB070612 - SDSS Pre-Burst Observations
  85. GRB 070612: Swift detection of a burst
  86. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  87. GRB 070610: SARA upper limit
  88. GRB 070610: Swift-XRT refined analysis
  89. GRB 070611: Swift/UVOT Observations
  90. GRB 070611: Swift-XRT refined analysis
  91. GRB 070611, Swift-BAT refined analysis
  92. GRB 070610: Optical observations from OSN
  93. GRB 070610: Watcher Observations
  94. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  95. GRB 070611: ROTSE-III Optical Limits
  96. GRB 070610: Swift-UVOT Upper Limits
  97. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  98. GRB 070610, Swift-BAT refined analysis
  99. GRB 070412: TAROT Calern observatory optical observations
  100. GRB 070411: TAROT Calern observatory optical observations

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