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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

38624 results found.

  1. GRB 071025 Milagro GeV/TeV Observations
  2. GRB 071025: SQIID JHK photometry
  3. Swift UVOT upper limits
  4. GRB071025: Xinglong TNT I-band upper limit
  5. GRB 071025: Swift-XRT Team refined analysis
  6. GRB 060602A: host redshift
  7. GRB 071025, Swift-BAT refined analysis
  8. GRB 071025: Early Super-LOTIS Observations
  9. GRB 071025: R/I-band update
  10. GRB071021 : CFHT Ks-band observation
  11. GRB 071025: ROTSE-III Refined Analysis
  12. GRB 071025: I-detection, R-dropout?
  13. GRB 071025: Swift XRT refined position
  14. GRB 071025a: PAIRITEL observations
  15. GRB071025: REM NIR afterglow
  16. GRB 071025: ROTSE-III Detection of Optical Counterpart
  17. GRB 071025: Swift detection of a burst
  18. GRB 071021: R-band detection and analysis
  19. GRB 071020: BTA spectroscopy
  20. Possible radio detection of GRB 071021 with the VLA
  21. GRB 071020: SARA observations
  22. Radio detection of GRB 071020 with the VLA
  23. GRB071010b: optical observation
  24. GRB 071021: Subaru NIR observation
  25. GRB071021: MITSuME Okayama Optical Upper Limits
  26. GRB 071021: Magellan i-band observation
  27. GRB 071021: Magellan R-band observation
  28. GRB 071021: Z-band detection
  29. GRB 071021: correction to GCNC 6968
  30. GRB 071020: Fading slowly?
  31. GRB 071010B: Fading quickly
  32. GRB 071021: optical and NIR observations
  33. GRB071018: 2nd epoch obsevations of Xinglong TNT
  34. GRB 071021: Swift-XRT Team refined analysis
  35. GRB 071021: Xinglong TNT optical Upper Limit
  36. GRB 071021 : Lulin R-band limit
  37. Konus-Wind observation of GRB 071020
  38. GRB 071021: Faulkes Telescope South optical candidate
  39. GRB 071021: Swift detection of a burst
  40. GRB 071010B: Independent Confirmation of Break
  41. GRB071020A: Xinglong TNT Optical afterglow observations
  42. GRB 071020: Swift-XRT refined analysis
  43. GRB 071020A: IR Imaging with PAIRITEL
  44. GRB 071020: VLT spectroscopy
  45. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  46. GRB071020 - SDSS Pre-burst Observations
  47. GRB 071020: Swift detection of a bright burst
  48. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  49. GRB 071018: Mercator Telescope optical observations
  50. Swift autonomous slewing re-enabled
  51. GRB071010b: optical observations
  52. GRB 071018: SARA observations
  53. GRB 071018: Swift-XRT observation
  54. GRB 071017 - Swift XRT observations
  55. VLA radio observation of GRB 071018
  56. GRB071018: Correction to the GCN 6936
  57. GRB071018: Correction to the GCN 6936
  58. GRB071018: Correction to the GCN 6936
  59. GRB 071018: Possible OT from Xinglong TNT observation
  60. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  61. GRB 071018?: Swift detection of a possible burst
  62. GRB 071010B: Suzaku WAM observation of the prompt emission
  63. GRB 071013: 3rd TLS Epoch - constraints on variability
  64. GRB 071013: TNT optical data refined analysis
  65. GRB 071010B: Keck/DEIMOS emission-line redshift
  66. GRB 071017: a SHORT GRB detected by INTEGRAL
  67. GRB071013: optical observations
  68. GRB 071011: MITSuME Optical Observations
  69. GRB 070920A: deep optical observations at the NOT
  70. GRB 071010B: Photometry after 1.6 days
  71. GRB 071010B: Keck/LRIS Photometry
  72. VLA detection of radio afterglow of GRB 071010B
  73. VLA non-detection of GRB 071011
  74. GRB 071013: Optical observations
  75. GRB 071013: optical observations at NOT
  76. GRB071013: optical limit
  77. GRB071010B, BVRcIc field calibration
  78. GRB 20071013: Xinglong TNT optical Upper Limit
  79. GRB 071013: Swift detection of a burst
  80. GRB 071010C Swift-BAT detection of a burst
  81. GRB 071011: Optical Limit after 13.95hrs
  82. GRB 071011: Xinglong TNT Optical afterglow observations
  83. GRB 071010B correction to GCN 6892 optical observations
  84. GRB 071011: Swift-XRT refined analysis
  85. VLA non-detection of GRB 071010A
  86. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  87. GRB 071011, Optical afterglow
  88. GRB 071010B: Optical Detection
  89. GRB 071011: Kanazawa Optical limits
  90. GRB 071011: P60 Optical Afterglow Candidate
  91. GRB 071011: MARGE Optical Limits
  92. GRB 071010B: Super-LOTIS upper limit
  93. GRB 071010B optical photometry
  94. GRB 071011: XRT afterglow detection
  95. GRB 071010B: Keck/LRIS Spectroscopy
  96. GRB 071010B: Gemini Spectroscopic Observations
  97. GRB 071011: Early Super-LOTIS Observations
  98. GRB 071011: NAYUTA Optical Observation
  99. GRB 071010A: Continued Keck Imaging
  100. GRB 071010B: Bright OT confirmed with TLS

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