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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"

38274 results found.

  1. Konus-Wind and Konus-A observations of GRB 071117
  2. Swift XRT follow-up observations of GRB071008
  3. Swift/UVOT upper limits for GRB 071117
  4. GRB071118: Swift XRT refined analysis
  5. GRB 071117: Gemini Optical Afterglow Discovery
  6. GRB 071118, Swift-BAT refined analysis
  7. GRB 071117: TAROT La Silla observatory optical observations
  8. GRB 071112B: Gemini Image Differencing
  9. GRB 071118: Swift detection of a burst
  10. GRB 071117: Gemini Observations
  11. GRB 071117: Las Campanas optical observations
  12. GRB 071117: Swift-XRT refined analysis
  13. GRB 071117, Swift-BAT refined analysis
  14. VLT FORS2 observations of short hard GRB071112B
  15. GRB 071117: Swift/XRT position
  16. GRB 071117: Initial Swift/UVOT observations
  17. GRB 071117: Swift detection of a bright burst
  18. Swift detection of MXB 0656-072
  19. VLA radio upper limit on GRB 071112C
  20. ATCA radio observations of short hard burst GRB 071112B
  21. GRB 071112C: Optical and NIR data observed with KANATA
  22. GRB 071112C: WSRT Radio Observations
  23. GRB 071112C: optical observation
  24. GRB 071112C: optical observation
  25. GRB 071112C: emission lines and refined VLT redshift
  26. GRB 071112C MITSuME Akeno early optical observation
  27. GRB 071112C: Gemini Absorption Redshift
  28. GRB 071112B: 2nd epoch of Magellan i-band imaging
  29. GRB 071112C: SARA upper limit
  30. GRB 071112C : Second Epoch Lulin R-band observations
  31. GRB071112C MITSuME Okayama Optical Observation
  32. GRB 071112C: Swift-BAT refined analysis
  33. GRB 071112C: Swift/UVOT observations
  34. GRB 071112C: Swift XRT refined analysis
  35. GRB 071112C: Optical observations at Crni Vrh
  36. Swift UVOT upper limits of GRB071112B
  37. GRB 071112C: VLT redshift
  38. GRB 071112B: Magellan i-band imaging
  39. GRB 071112B: Gemini Optical Imaging (Correction)
  40. GRB 071112B: Gemini Optical Imaging
  41. GRB 071112B: Swift-XRT preliminary analysis
  42. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  43. GRB071112C: NOT observations
  44. GRB 071112C: Palomar Pre-Imaging
  45. Swift-BAT trigger 296491 is not a GRB
  46. GRB 071112C : Lulin R-band observation
  47. GRB 071112C: RTT150 optical observations
  48. GRB 071112C: TAROT Calern observatory optical observations
  49. Swift XRT follow-up observations of GRB071028B
  50. GRB 071112C: Optical and NIR afterglows observed with KANATA
  51. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  52. GRB 071112B: ROTSE-III Rapid Optical Limits
  53. GRB 071112C: Swift detection of a burst with an optical counterpart
  54. GRB 071112B: Swift detection of a short hard burst
  55. GRB 071112: Swift detection of a possible burst
  56. VLA IInd observation of INTEGRAL burst GRB 071109
  57. Swift/UVOT initial analysis of GRB071109
  58. GRB 071109: further Swift-XRT analysis
  59. GRB 071109: TAROT Calern observatory optical observations
  60. No radio detection at Swift-XRT position
  61. GRB 071109: Swift-XRT possible X-ray counterpart
  62. VLA prompt radio detection of the INTEGRAL burst 071109
  63. GRB 071109: IBIS refined analysis
  64. GRB 071109: BOOTES-2 prompt optical observations
  65. GRB 071109: A long GRB detected by INTEGRAL
  66. GRB 071104: Swift-XRT Team Refined Analysis
  67. GRB 071104: Possible Swift UVOT Afterglow Candidate
  68. GRB 071104: Swift-XRT position
  69. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  70. GRB071010b: optical observation
  71. Swift XRT and UVOT observations of GRB071028B
  72. GRB 071101, Swift-BAT refined analysis
  73. GRB 071101: Swift-XRT Team refined analysis
  74. GRB071101: Optical and NIR upper limits by KANATA
  75. GRB 071101: TAROT Calern observatory optical observations
  76. GRB 071101: Swift XRT position
  77. GRB071101 LOAO B,V,R,I observation
  78. GRB 071101: BOOTES-2 prompt optical observations
  79. GRB 071101: a nearby galaxy
  80. GRB 071101: Swift detection of a burst
  81. GRB 071031, Swift-BAT refined analysis
  82. GRB 071031: Swift/UVOT detection of afterglow
  83. GRB 071031: Swift-XRT Team refined analysis
  84. GRB 071020: MITSuME Akeno optical observations
  85. GRB 071031: REM NIR and Optical observation
  86. GRB 071031, SMARTS afterglow observations
  87. GRB 071031: VLT high-resolution spectroscopy
  88. GRB071031: Rapid PROMPT Detections
  89. GRB 071031: GROND detection in all bands
  90. GRB 071031: Swift detection of a burst with an optical counterpart
  91. GRB 071028B Swift-BAT detection of a burst
  92. GRB 071028: SARA observations of variable source
  93. Swift UVOT upper limits to GRB071028
  94. GRB 071028: Swift-XRT Team refined analysis
  95. GRB 071028, Swift-BAT refined analysis
  96. GRB 071028: Swift detection of a burst
  97. GRB 071025: Kuiper Telescope Optical Observations
  98. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  99. GRB 071018: Revised BAT position
  100. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior

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