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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"

22207 results found.

  1. GRB041223: decay of the afterglow
  2. GRB041224: ROTSE-III Optical Observations
  3. GRB 041224: near-infrared observations with REM
  4. GRB041223: optical and NIR observations with REM
  5. Swift-BAT Time History of GRB041219
  6. GRB 041219: TAROT optical observations
  7. GRB 041218: TAROT optical observations
  8. GRB 041223: J-band observations of the afterglow
  9. GRB 041223: Detection of Optical Transient with LCO40
  10. GRB041223: Swift XRT Detection of X-ray Afterglow Emission
  11. GRB 041219c: PROMPT Observations
  12. GRB041223: ROTSE-III Optical Observations
  13. GRB 041218: optical observations
  14. GRB 041219: Second Epoch WSRT Radio Observations
  15. GRB 041219: WSRT Radio Afterglow Detection
  16. GRB 041219: Keck IR Observations and Astrometric Refinement of the
  17. GRB 041218: Optical observations
  18. GRB 041219 : optical follow-up observations
  19. Deep RAPTOR observations during GRB 041219
  20. GRB 041218 Optical Observations
  21. GRB 041219 Optical Observations
  22. GRB041219: Optical Afterglow Detection
  23. GRB041219: Continued NIR Observations
  24. GRB 041219: Radio Afterglow Detection
  25. GRB 041218 : Radio Observations
  26. GRB 041218: R-band optical observations
  27. GRB041218: Liverpool Telescope optical observations
  28. GRB041218: optical observations
  29. GRB041219: Confirmed NIR Afterglow
  30. GRB041218: Continued P60 Optical Observations
  31. GRB 041219: Infrared Afterglow Candidate
  32. GRB 041219: Infrared Afterglow Candidate
  33. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  34. GRB041219: P60 Optical Observations
  35. GRB 041219: PAIRITEL IR Observations, < 3 minutes after trigger
  36. GRB 041217: PROMPT Observations
  37. GRB041218: optical observations
  38. GRB 041218; optical candidate
  39. GRB 041218: Optical observations
  40. GRB 041217: LCO40 Optical Observations and Possible Candidates
  41. GRB041217: Optical Observations
  42. GRB041217: NIR and optical observations with REM
  43. GRB041217: P60 Optical Observations
  44. GRB041217: Infrared Observations
  45. GRB041211: Faulkes Telescope continued optical monitoring
  46. Optical transient (GRB?) in Lynx
  47. Optical transient (GRB?) in Lynx, UT Dec 11.4436
  48. GRB041211: Continued P60 Observations
  49. GRB041211: RAPTOR observations
  50. GRB041211, Faulkes Telescope optical observation
  51. GRB 041211: Infrared Observations
  52. GRB 041211: KAIT observations
  53. GRB 041211: Optical follow-up in East Asian region
  54. GRB970815: Discovery of Optical Afterglow
  55. GRB041015: Near-Infrared observations
  56. GRB 040924: Afterglow Color
  57. Summary of the recent bursts from SGR 1806-20
  58. GRB 041006: Optical Observations
  59. GRB041006: RTT150 Optical Observations
  60. GRB041015 : Multi epoch optical observations
  61. HST Observations: XRF 040701 and 040812
  62. GRB041006: RTT150 Optical Observations
  63. GRB 041016:Optical limit during first minute
  64. GRB041016: MASTER: Optical observations
  65. GRB 041015: Optical Observations at Rikubetsu
  66. GRB041006: Near Infrared observations
  67. GRB 041015 R band observations
  68. GRB041015: MASTER: Optical observations
  69. GRB041006: Fading X-ray Afterglow Observed with Chandra
  70. GRB 041006 R observations in Loiano
  71. GRB041006: VLT observations of the afterglow and host galaxy
  72. GRB041006: Optical observations and Potential host galaxy
  73. GRB 041006: SARA afterglow observations
  74. Search for SN light in XRF 040912 with MEGACAM
  75. GRB 040916: Afterglow Color at Early Times
  76. GRB 041006 Optical afterglow observations
  77. IBAS GRB Alert # 2010
  78. GRB 041006: BR observations with VATT
  79. GRB 041006: Redshift confirmed
  80. GRB041006: Liverpool Telescope optical observations
  81. GRB 041006: Colour measurement
  82. GRB 041006: Radio Observations
  83. GRB041006, further submilllimetre observations
  84. GRB041006: Optical photometry and spectroscopy at TNG
  85. GRB041006 (= H3570): Chandra Observations In Progress
  86. GRB041006, optical I observation
  87. GRB041006 (=HETE3570): optical observations
  88. ROTSE-IIIa Observations of GRB 041006
  89. GRB041006, submillimetre observations
  90. GRB041006: MASTER optical observations
  91. GRB 041006: Optical decay
  92. Very strong outburst from SGR 1806-20 detected with INTEGRAL
  93. XRF 020903: Observations of the Host Galaxy (authors)
  94. XRF 020903: Observations of the Host Galaxy
  95. SGR 1806-20 still active
  96. GRB 040924: Second Epoch WSRT Radio Observations
  97. radio observations, GRB 040924
  98. GRB040929: MASTER optical observations
  99. Konus-Wind and Helicon-Coronas-F observations of GRB040924
  100. GRB040924,optical observation

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