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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"

17798 results found.

  1. GRB 070802: Swift-XRT refined analysis
  2. GRB070802: Swift/UVOT upper limits
  3. GRB 070802: V-band detection of the candidate afterglow
  4. GRB 070802: GROND J band candidate
  5. Swift/UVOT detection of GRB070714B
  6. VLA upper limit on short hard burst GRB 070714B
  7. GRB070729: Swift/UVOT upper limits
  8. GRB 070724B: P60 Observations
  9. GRB 070724B: Swift/UVOT Upper limits
  10. GRB 070724B: Swift-XRT afterglow likely candidate
  11. GRB 070721A: optical observations
  12. GRB 070724A: further VLT observations
  13. Four radio sources in Swift-XRT error box of GRB 070724
  14. GRB 070724: P60 and Gemini Observations
  15. GRB 060814 - Keck host detection and redshift
  16. Swift/UVOT refined analysis of GRB070724
  17. GRB 070724: Swift-XRT Team refined analysis
  18. GRB 070721B: further observations and analysis
  19. GRB 070724: Swift detection of a burst
  20. GRB 070714B: Keck observations
  21. Swift/UVOT Observations of GRB070721A
  22. GRB 070721B : Faulkes Telescope South observations
  23. GRB 070721A : Faulkes Telescope South optical limit
  24. GRB 070721A: Swift/XRT refined analysis
  25. GRB070721B: A bright UVOT candidate
  26. GRB070714B: TNG NIR observations
  27. GRB 070714A: Swift/UVOT Upper limits
  28. GRB 070714B: Swift/UVOT Upper Limits
  29. GRB 070714B: Swift-BAT spectral lag for the SHB
  30. GRB 070714B: confirmation of optical afterglow
  31. GRB 070616: No Evidence for I Band Afterglow
  32. GRB 070714A: Swift XRT refined analysis
  33. GRB070714B: Swift-XRT refined analysis
  34. GRB 070714 : Liverpool Telescope optical counterpart ?
  35. GRB 070714: Swift detection of a bright burst, possibly short
  36. GRB 070704: RTT150 optical observations
  37. GRB 070707: optical afterglow
  38. Swift/UVOT Observations of GRB070707
  39. Swift XRT observation of GRB 070707
  40. GRB 070707: VLT observations
  41. GRB070704: FAVOR optical observations
  42. GRB 070704 : Liverpool Telescope Observations
  43. GRB 070611: VLT observations
  44. VLA detection of GRB 070612A in C Band
  45. GRB 070704: Swift-XRT refined analysis
  46. Swift/UVOT Observations of GRB070704
  47. GRB 070704: Correction to GCN Circ 6594
  48. GRB 070704: Swift detection of a burst
  49. GRB 070628 Swift-UVOT Refined Analysis
  50. GRB 070628: NIR detection of afterglow
  51. GRB 070628: TAROT La Silla observatory optical observations
  52. GRB 070616 : WIDGET simultaneous optical observations
  53. GRB070621: RTT150 optical observations
  54. GRB 070621: VLT optical observations
  55. GRB 070621: Swift/UVOT Upper Limits
  56. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  57. GRB 070621: Gemini South optical imaging
  58. GRB 070621: UVOT-enhanced XRT position
  59. Observations of GRB070612A at Calar Alto
  60. GRB 070621: NOT observations
  61. GRB 070621: TAROT Calern observatory optical observations
  62. GRB 070621: Watcher Observations
  63. GRB 070621: Swift detection of a burst
  64. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  65. Swift/UVOT detection of GRB070616 optical afterglow.
  66. GRB070616: Optical Observation by MITSuME Okayama
  67. GRB 070616: TLS observation
  68. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  69. GRB 070616: Swift detection of a burst
  70. GRB 070612B: optical observations
  71. UVOT Observations of INTEGRAL burst GRB070615
  72. VLA upper limit on GRB 070610
  73. GRB 070615
  74. SWIFT J195509.6+261406 (GRB 070610): further observations
  75. GRB 070612A: Super-LOTIS observations
  76. GRB 070612A: Rapid Decay
  77. GRB070612A: MITSuME Okayama Observation
  78. GRB 070612A: continued SARA observations
  79. GRB 070611: Watcher Observations
  80. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  81. GRB 070612B: SARA upper limit
  82. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  83. GRB 070612B: Swift/UVOT upper limits
  84. GRB 070612B: FRAM limit
  85. GRB070612B: P60 Observations
  86. GRB 070612A: SARA detection of possible OT
  87. GRB 070610: TAROT Calern observatory optical observations
  88. GRB 070610: MITSuME OAO optical upper limit
  89. GRB070612 - SDSS Pre-Burst Observations
  90. GRB 070610: SARA upper limit
  91. GRB 070610: Swift-XRT refined analysis
  92. GRB 070611: Swift/UVOT Observations
  93. GRB 070610: Optical observations from OSN
  94. GRB 070610: Watcher Observations
  95. GRB 070611: ROTSE-III Optical Limits
  96. GRB 070610: Swift-UVOT Upper Limits
  97. GRB 070412: TAROT Calern observatory optical observations
  98. GRB 070411: TAROT Calern observatory optical observations
  99. GRB 070531: NOT nIR observations
  100. GRB 070531: I-band observations from IAC80

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