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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"

37438 results found.

  1. GRB 071031: VLT high-resolution spectroscopy
  2. GRB 071031: Swift detection of a burst with an optical counterpart
  3. GRB 071028B Swift-BAT detection of a burst
  4. GRB 071028: SARA observations of variable source
  5. Swift UVOT upper limits to GRB071028
  6. GRB071028: Xinglong EST V-band upper limit
  7. GRB 071028: Swift-XRT Team refined analysis
  8. GRB 071028: Swift detection of a burst
  9. GRB 071025: Kuiper Telescope Optical Observations
  10. GRB 071003: Infrared Photometry with Keck Adaptive Optics
  11. GRB 071018: Revised BAT position
  12. GRB071021: MARGE Optical Limits
  13. GRB071020, optical upper limit
  14. GRB 071025: SARA VRI upper limits
  15. GRB 071025 Milagro GeV/TeV Observations
  16. GRB 071025: SQIID JHK photometry
  17. Swift UVOT upper limits
  18. GRB071025: Xinglong TNT I-band upper limit
  19. GRB 071025: Swift-XRT Team refined analysis
  20. GRB 060602A: host redshift
  21. GRB 071025, Swift-BAT refined analysis
  22. GRB 071025: Early Super-LOTIS Observations
  23. GRB 071025: R/I-band update
  24. GRB071021 : CFHT Ks-band observation
  25. GRB 071025: ROTSE-III Refined Analysis
  26. GRB 071025: I-detection, R-dropout?
  27. GRB 071025: Swift XRT refined position
  28. GRB 071025a: PAIRITEL observations
  29. GRB071025: REM NIR afterglow
  30. GRB 071025: ROTSE-III Detection of Optical Counterpart
  31. GRB 071025: Swift detection of a burst
  32. GRB 071021: R-band detection and analysis
  33. GRB 071020: BTA spectroscopy
  34. Possible radio detection of GRB 071021 with the VLA
  35. GRB 071020: SARA observations
  36. Radio detection of GRB 071020 with the VLA
  37. GRB071010b: optical observation
  38. GRB 071021: Subaru NIR observation
  39. GRB071021: MITSuME Okayama Optical Upper Limits
  40. GRB 071021: Magellan i-band observation
  41. GRB 071021: Magellan R-band observation
  42. GRB 071021: Z-band detection
  43. GRB 071021: correction to GCNC 6968
  44. GRB 071020: Fading slowly?
  45. GRB 071010B: Fading quickly
  46. GRB 071021: optical and NIR observations
  47. GRB071018: 2nd epoch obsevations of Xinglong TNT
  48. GRB 071021: Swift-XRT Team refined analysis
  49. GRB 071021: Xinglong TNT optical Upper Limit
  50. GRB 071021 : Lulin R-band limit
  51. Konus-Wind observation of GRB 071020
  52. GRB 071021: Faulkes Telescope South optical candidate
  53. GRB 071021: Swift detection of a burst
  54. GRB 071010B: Independent Confirmation of Break
  55. GRB071020A: Xinglong TNT Optical afterglow observations
  56. GRB 071020: Swift-XRT refined analysis
  57. GRB 071020A: IR Imaging with PAIRITEL
  58. GRB 071020: VLT spectroscopy
  59. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  60. GRB071020 - SDSS Pre-burst Observations
  61. GRB 071020: Swift detection of a bright burst
  62. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  63. GRB 071018: Mercator Telescope optical observations
  64. Swift autonomous slewing re-enabled
  65. GRB071010b: optical observations
  66. GRB 071018: SARA observations
  67. GRB 071018: Swift-XRT observation
  68. GRB 071017 - Swift XRT observations
  69. VLA radio observation of GRB 071018
  70. GRB071018: Correction to the GCN 6936
  71. GRB071018: Correction to the GCN 6936
  72. GRB071018: Correction to the GCN 6936
  73. GRB 071018: Possible OT from Xinglong TNT observation
  74. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  75. GRB 071018?: Swift detection of a possible burst
  76. GRB 071010B: Suzaku WAM observation of the prompt emission
  77. GRB 071013: 3rd TLS Epoch - constraints on variability
  78. GRB 071013: TNT optical data refined analysis
  79. GRB 071010B: Keck/DEIMOS emission-line redshift
  80. GRB 071017: a SHORT GRB detected by INTEGRAL
  81. GRB071013: optical observations
  82. GRB 071011: MITSuME Optical Observations
  83. GRB 070920A: deep optical observations at the NOT
  84. GRB 071010B: Photometry after 1.6 days
  85. GRB 071010B: Keck/LRIS Photometry
  86. VLA detection of radio afterglow of GRB 071010B
  87. VLA non-detection of GRB 071011
  88. GRB 071013: Optical observations
  89. GRB 071013: optical observations at NOT
  90. GRB071013: optical limit
  91. GRB071010B, BVRcIc field calibration
  92. GRB 20071013: Xinglong TNT optical Upper Limit
  93. GRB 071013: Swift detection of a burst
  94. GRB 071010C Swift-BAT detection of a burst
  95. GRB 071011: Optical Limit after 13.95hrs
  96. GRB 071011: Xinglong TNT Optical afterglow observations
  97. GRB 071010B correction to GCN 6892 optical observations
  98. GRB 071011: Swift-XRT refined analysis
  99. VLA non-detection of GRB 071010A
  100. GRB 071011: NAYUTA Optical Observation, correction to GCN6886

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