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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"

32550 results found.

  1. GRB041223: optical and NIR observations with REM
  2. Swift-BAT Time History of GRB041219
  3. GRB 041219: TAROT optical observations
  4. GRB 041223: J-band observations of the afterglow
  5. GRB 041223: Detection of Optical Transient with LCO40
  6. GRB041223: Swift XRT Detection of X-ray Afterglow Emission
  7. GRB 041219c: PROMPT Observations
  8. GRB041223: ROTSE-III Optical Observations
  9. GRB 041218: optical observations
  10. Very high activity of SGR 1806-20
  11. GRB 041219: Second Epoch WSRT Radio Observations
  12. GRB 041219: WSRT Radio Afterglow Detection
  13. GRB 041219: Keck IR Observations and Astrometric Refinement of the
  14. GRB 041218: Optical observations
  15. GRB 041219 : optical follow-up observations
  16. Deep RAPTOR observations during GRB 041219
  17. GRB 041218 Optical Observations
  18. GRB 041219 Optical Observations
  19. GRB041219: Optical Afterglow Detection
  20. GRB041219: Continued NIR Observations
  21. GRB 041219: Radio Afterglow Detection
  22. GRB 041218 : Radio Observations
  23. GRB 041218: R-band optical observations
  24. GRB041218: Liverpool Telescope optical observations
  25. GRB041218: optical observations
  26. GRB041219: Confirmed NIR Afterglow
  27. Swift-BAT detection of the bright long burst GRB041219
  28. GRB 041218: Optical Observation
  29. GRB 041219: Infrared Afterglow Candidate
  30. GRB041219, BVRcIc field calibration
  31. GRB 041219: Infrared Afterglow Candidate
  32. GRB041218, BVRcIc field calibration
  33. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  34. GRB 041217: PROMPT Observations
  35. GRB041218: optical observations
  36. GRB041217: optical limit 30 min after GRB
  37. GRB 041218; optical candidate
  38. GRB 041218: Optical observations
  39. GRB 041217: LCO40 Optical Observations and Possible Candidates
  40. GRB041217: Optical Observations
  41. GRB041217: NIR and optical observations with REM
  42. GRB041217: Infrared Observations
  43. GRB041217: The First GRB Located On-Board Swift
  44. GRB041211: Faulkes Telescope continued optical monitoring
  45. Optical Transient in Lynx not a GRB
  46. Optical transient (GRB?) in Lynx
  47. GRB041211: Continued P60 Observations
  48. GRB041211, Faulkes Telescope optical observation
  49. GRB041211, BVRcIc field calibration
  50. GRB 041211: Infrared Observations
  51. GRB 041211: Optical follow-up in East Asian region
  52. GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC
  53. GRB041015: Near-Infrared observations
  54. GRB 040924: Afterglow Color
  55. GRB 041006: GETS Optical Afterglow Observation
  56. Summary of the recent bursts from SGR 1806-20
  57. GRB 041006: Optical Observations
  58. GRB041006, late-time optical photometry
  59. GRB041006: RTT150 Optical Observations
  60. GRB041015 : Multi epoch optical observations
  61. GRB041006: RTT150 Optical Observations
  62. GRB 041016: Optical limits
  63. GRB 041015: Optical Observations at Rikubetsu
  64. GRB041006: Near Infrared observations
  65. GRB040924, BVRcIc field calibration
  66. GRB 041015: Optical limit at Osaka University
  67. GRB041015 : Optical follow-up at Kiso
  68. GRB 041006 R observations in Loiano
  69. GRB041006: VLT observations of the afterglow and host galaxy
  70. GRB041006: Optical observations and Potential host galaxy
  71. GRB041006, BVRcIc field calibration
  72. GRB 040924: VLT spectroscopy
  73. GRB 041006: SARA afterglow observations
  74. GRB041006, optical observation in CrAO
  75. Search for SN light in XRF 040912 with MEGACAM
  76. GRB 040916: Afterglow Color at Early Times
  77. GRB 041006 Optical afterglow observations
  78. GRB 041006: BR observations with VATT
  79. GRB 041006: Redshift confirmed
  80. GRB041006: Liverpool Telescope optical observations
  81. GRB 041006: Colour measurement
  82. GRB041006: break in the light curve
  83. GRB 041006: Radio Observations
  84. GRB 041006 : optical follow-up observation at Lulin Observatory
  85. GRB 041006 : Optical follow-up observation at TAROT
  86. GRB041006: Optical photometry and spectroscopy at TNG
  87. GRB 041006: presice astrometry
  88. GRB041006 (= H3570): Chandra Observations In Progress
  89. GRB 041006 : optical observation at Bisei
  90. GRB041006, optical I observation
  91. GRB041006 (=HETE3570): optical observations
  92. ROTSE-IIIa Observations of GRB 041006
  93. GRB041006, optical observation
  94. GRB041006, submillimetre observations
  95. GRB041006: MASTER optical observations
  96. GRB 041006: Optical decay
  97. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  98. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  99. GRB041006: Fading of optical afterglow candidate
  100. GRB 041006 : Optical follow-up observation at KISO

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