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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"

22067 results found.

  1. GRB070714B: TNG NIR observations
  2. GRB 070714A: Swift/UVOT Upper limits
  3. GRB 070714B: Swift/UVOT Upper Limits
  4. GRB 070714B: confirmation of optical afterglow
  5. GRB 070616: No Evidence for I Band Afterglow
  6. GRB 070714A: Swift XRT refined analysis
  7. GRB070714B: Swift-XRT refined analysis
  8. GRB 070707: Swift-XRT follow-up observations
  9. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  10. GRB 070714 ("Bastille"): Optical Pre-Imaging
  11. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  12. GRB 070714 : Liverpool Telescope optical counterpart ?
  13. GRB 070714: Swift detection of a bright burst, possibly short
  14. GRB 070704: RTT150 optical observations
  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: Correction to GCN Circ 6594
  26. GRB 070704: Swift detection of a burst
  27. GRB 070626: IPN localization and Konus spectrum of a bright long burst
  28. GRB 070628 Swift-UVOT Refined Analysis
  29. GRB 070628: NIR detection of afterglow
  30. GRB 070628: TAROT La Silla observatory optical observations
  31. GRB 070628: Swift XRT refined analysis
  32. GRB 070628: Swift detection of a possible burst
  33. GRB 070612A: Allen Telescope Array Observations
  34. OT20050728 was not an optical GRB afterglow
  35. INTEGRAL burst GRB070615: X-ray continued observations
  36. GRB 070616 : WIDGET simultaneous optical observations
  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. GRB 070621: Gemini South optical imaging
  43. GRB 070621: UVOT-enhanced XRT position
  44. Observations of GRB070612A at Calar Alto
  45. GRB 070621: NOT observations
  46. GRB070621: OPTIMA-Burst optical upper limit
  47. GRB 070621: TAROT Calern observatory optical observations
  48. GRB 070621: Watcher Observations
  49. GRB 070621: ROTSE-III Prompt Optical Limits
  50. GRB 070621: Swift detection of a burst
  51. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  52. GRB 070612A: TNG optical observations
  53. Swift/UVOT detection of GRB070616 optical afterglow.
  54. GRB 070612A: NOT observations
  55. GRB070616: Optical Observation by MITSuME Akeno
  56. GRB 070612B: Optical Observation by MITSuME Akeno
  57. GRB070616: Optical Observation by MITSuME Okayama
  58. GRB 070612A: Possible WSRT Radio Detection
  59. Swift/UVOT observations of GRB070616
  60. GRB 070616: TLS observation
  61. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  62. GRB 070616: Swift detection of a burst
  63. GRB 070612B: optical observations
  64. UVOT Observations of INTEGRAL burst GRB070615
  65. VLA upper limit on GRB 070610
  66. GRB 070615
  67. SWIFT J195509.6+261406 (GRB 070610): further observations
  68. GRB 070612A: Super-LOTIS observations
  69. GRB 070612A: Rapid Decay
  70. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  71. GRB070612A: MITSuME Okayama Observation
  72. GRB 070612A: continued SARA observations
  73. GRB 070612A: spectral lag
  74. GRB 070611: Watcher Observations
  75. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  76. GRB 070612B: SARA upper limit
  77. GRB 070612B: Swift-XRT refined analysis
  78. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  79. GRB 070612B: Swift/UVOT upper limits
  80. GRB 070612B: FRAM limit
  81. GRB070612B: P60 Observations
  82. GRB 070612A: SARA detection of possible OT
  83. GRB 070610: TAROT Calern observatory optical observations
  84. GRB 070610: MITSuME OAO optical upper limit
  85. GRB 070612B: Swift detection of a burst
  86. GRB070612 - SDSS Pre-Burst Observations
  87. GRB 070612: Swift detection of a burst
  88. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  89. GRB 070610: SARA upper limit
  90. GRB 070610: Swift-XRT refined analysis
  91. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  92. GRB 070611: Swift/UVOT Observations
  93. GRB 070611: Swift-XRT refined analysis
  94. GRB 070610: Optical observations from OSN
  95. GRB 070610: Watcher Observations
  96. GRB 070611: ROTSE-III Optical Limits
  97. GRB 070611: Swift detection of a burst
  98. GRB 070610: Swift-UVOT Upper Limits
  99. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  100. GRB 070610: Swift detection of a burst

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