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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"

44262 results found.

  1. GRB 071112: Swift detection of a possible burst
  2. GRB071109: Super-LOTIS observations
  3. VLA IInd observation of INTEGRAL burst GRB 071109
  4. Swift/UVOT initial analysis of GRB071109
  5. GRB 071109: further Swift-XRT analysis
  6. GRB 071109: TAROT Calern observatory optical observations
  7. No radio detection at Swift-XRT position
  8. GRB 071109: Swift-XRT possible X-ray counterpart
  9. VLA prompt radio detection of the INTEGRAL burst 071109
  10. GRB 071109: IBIS refined analysis
  11. GRB 071109: BOOTES-2 prompt optical observations
  12. GRB 071109: A long GRB detected by INTEGRAL
  13. GRB 071104: Swift-XRT Team Refined Analysis
  14. GRB 071104: Possible Swift UVOT Afterglow Candidate
  15. GRB 071104: Swift-XRT position
  16. GRB 071104: Gamma Ray Burst Localization by SuperAGILE
  17. GRB071010b: optical observation
  18. Swift XRT and UVOT observations of GRB071028B
  19. GRB 071101, Swift-BAT refined analysis
  20. GRB 071101: Swift-XRT Team refined analysis
  21. GRB071101: Optical and NIR upper limits by KANATA
  22. GRB0711101: Two new source from Xinglong TNT observation
  23. GRB 071101: TAROT Calern observatory optical observations
  24. GRB 071101: Swift XRT position
  25. GRB071101 LOAO B,V,R,I observation
  26. GRB 071101: BOOTES-2 prompt optical observations
  27. GRB 071101: a nearby galaxy
  28. GRB 071101: Swift detection of a burst
  29. GRB 071031, Swift-BAT refined analysis
  30. GRB 071031: Swift/UVOT detection of afterglow
  31. GRB 071031: Swift-XRT Team refined analysis
  32. GRB 071020: MITSuME Akeno optical observations
  33. GRB 071031: REM NIR and Optical observation
  34. GRB 071031, SMARTS afterglow observations
  35. GRB 071031: VLT high-resolution spectroscopy
  36. GRB071031: Rapid PROMPT Detections
  37. GRB 071031: GROND detection in all bands
  38. GRB 071031: Swift detection of a burst with an optical counterpart
  39. GRB 071028B Swift-BAT detection of a burst
  40. GRB071025: Optical+NIR observations
  41. GRB 071028: SARA observations of variable source
  42. Swift UVOT upper limits to GRB071028
  43. GRB071028: Xinglong EST V-band upper limit
  44. GRB 071028: Swift-XRT Team refined analysis
  45. GRB 071028, Swift-BAT refined analysis
  46. GRB 071028: Swift detection of a burst
  47. GRB 071025: Kuiper Telescope Optical Observations
  48. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  49. GRB 071018: Revised BAT position
  50. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  51. GRB071021: MARGE Optical Limits
  52. GRB071020, optical upper limit
  53. GRB 071025: SARA VRI upper limits
  54. GRB 071025 Milagro GeV/TeV Observations
  55. GRB 071025: SQIID JHK photometry
  56. GRB 071025A: Complex Early-Time IR Behavior, Simultaneous with Gamma- and X-rays
  57. GRB071025: Optical Pre-imaging from Palomar
  58. Swift UVOT upper limits
  59. GRB071025: Xinglong TNT I-band upper limit
  60. GRB 071025: Swift-XRT Team refined analysis
  61. GRB 060602A: host redshift
  62. GRB 071025, Swift-BAT refined analysis
  63. GRB 071025: Early Super-LOTIS Observations
  64. GRB 071025: R/I-band update
  65. GRB071021 : CFHT Ks-band observation
  66. GRB 071025: ROTSE-III Refined Analysis
  67. GRB 071025: I-detection, R-dropout?
  68. GRB 071025: Swift XRT refined position
  69. GRB 071025a: PAIRITEL observations
  70. GRB071025: REM NIR afterglow
  71. GRB 071025: ROTSE-III Detection of Optical Counterpart
  72. GRB 071025: Swift detection of a burst
  73. GRB 071021: R-band detection and analysis
  74. GRB 071020: BTA spectroscopy
  75. GRB071021: Optical+NIR observations
  76. Possible radio detection of GRB 071021 with the VLA
  77. Optical observations of GRB 071020
  78. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  79. GRB 071020: SARA observations
  80. Radio detection of GRB 071020 with the VLA
  81. GRB071010b: optical observation
  82. GRB 071021: Subaru NIR observation
  83. GRB071021: MITSuME Okayama Optical Upper Limits
  84. GRB 071021: Magellan i-band observation
  85. GRB 071021: Magellan R-band observation
  86. GRB 071021: Z-band detection
  87. GRB 071021: correction to GCNC 6968
  88. GRB 071020: Fading slowly?
  89. GRB 071010B: Fading quickly
  90. GRB 071021: optical and NIR observations
  91. GRB 071021: possible high-z burst
  92. GRB 071021, Swift-BAT refined analysis
  93. GRB071018: 2nd epoch obsevations of Xinglong TNT
  94. GRB 071021: retraction of Faulkes Telescope South candidate
  95. GRB 071021: Swift-XRT Team refined analysis
  96. GRB 071021: Xinglong TNT optical Upper Limit
  97. GRB 071021 : Lulin R-band limit
  98. Konus-Wind observation of GRB 071020
  99. GRB 071021: Faulkes Telescope South optical candidate
  100. GRB 071021: Swift detection of a burst

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