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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"

37680 results found.

  1. GRB041211: Continued P60 Observations
  2. GRB041211: RAPTOR observations
  3. GRB041211: Ashra Prototype optical observation
  4. GRB041211, Faulkes Telescope optical observation
  5. GRB041211, BVRcIc field calibration
  6. GRB 041211: Infrared Observations
  7. GRB 041211: KAIT observations
  8. GRB 041211: Optical follow-up in East Asian region
  9. GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC
  10. GRB041211: P60 optical imaging
  11. GRB970815: Discovery of Optical Afterglow
  12. Distribution of IBAS Alerts for NON-GRB sources
  13. Triangulation of short GRB 041116 (large error box)
  14. GRB 040924: Afterglow Color
  15. GRB 041006: GETS Optical Afterglow Observation
  16. Summary of the recent bursts from SGR 1806-20
  17. GRB 041006: Optical Observations
  18. GRB041006, late-time optical photometry
  19. IBAS GRB Alert # 2034
  20. GRB041006: RTT150 Optical Observations
  21. Bright bursts from SGR1806-20
  22. GRB 041016: BOOTES-2 simultaneous observation
  23. GRB041006: RTT150 Optical Observations
  24. GRB 041016: Optical limits
  25. GRB 041016: Optical limits in V, R, I
  26. GRB 041016:Optical limit during first minute
  27. GRB041016: MASTER: Optical observations
  28. GRB 041015: Optical Observations at Rikubetsu
  29. GRB041006: Near Infrared observations
  30. GRB 041016: Optical limit
  31. GRB 041015 R band observations
  32. GRB040924, BVRcIc field calibration
  33. GRB041015: MASTER: Optical observations
  34. GRB041015,optical observation
  35. GRB 041015: Optical limit at Osaka University
  36. GRB041015 : Optical follow-up at Kiso
  37. GRB 041015 - A long GRB detected by INTEGRAL
  38. GRB 041006 R observations in Loiano
  39. GRB041006: VLT observations of the afterglow and host galaxy
  40. GRB041006: Optical observations and Potential host galaxy
  41. GRB041006, BVRcIc field calibration
  42. GRB 040924: VLT spectroscopy
  43. GRB 041006: SARA afterglow observations
  44. Search for SN light in XRF 040912 with MEGACAM
  45. GRB 040916: Afterglow Color at Early Times
  46. GRB 041006 Optical afterglow observations
  47. IBAS GRB Alert # 2010
  48. GRB 041006: BR observations with VATT
  49. GRB 041006: Redshift confirmed
  50. GRB041006: Liverpool Telescope optical observations
  51. GRB 041006: Colour measurement
  52. GRB041006: break in the light curve
  53. GRB 041006: Radio Observations
  54. GRB041006, further submilllimetre observations
  55. GRB 041006 : optical follow-up observation at Lulin Observatory
  56. GRB 041006 : Optical follow-up observation at TAROT
  57. GRB041006: Optical photometry and spectroscopy at TNG
  58. GRB 041006: presice astrometry
  59. GRB041006 (= H3570): Chandra Observations In Progress
  60. GRB 041006 : optical observation at Bisei
  61. GRB041006 (=HETE3570): optical observations
  62. ROTSE-IIIa Observations of GRB 041006
  63. GRB041006, submillimetre observations
  64. GRB041006: MASTER optical observations
  65. GRB 041006: Optical decay
  66. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  67. GRB 041006 : Optical follow-up observation at KISO
  68. GRB 041006: Finding chart
  69. GRB 041006: Optical afterglow candidate
  70. XRF 020903: Observations of the Host Galaxy (authors)
  71. GRB 040924: Second Epoch WSRT Radio Observations
  72. radio observations, GRB 040924
  73. IBAS Alert 1991. Not a real GRB
  74. GRB040929,optical observation
  75. GRB040924,optical observation
  76. GRB040924, RTT150 optical observation
  77. GRB 040924: detection of possible host galaxy by Subaru
  78. GRB040924, RTT150 optical observation
  79. GRB040924: KAIT observations
  80. GRB040924: Afterglow magnitude at t=17.5hr
  81. GRB 040924: WSRT Radio Observations
  82. GRB 040924: NIR finding chart
  83. GRB040924 : Optical candidate observations at Lulin observatory
  84. GRB040924 : Optical candidate observations at Lulin observatory
  85. GRB 040924: Subaru NIR observation
  86. GRB 040924: RTT150 optical observations
  87. GRB 040924, optical follow-up
  88. IPN triangulation of GRB040924 (H3564)
  89. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  90. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  91. XRF040916: continuing decay of OT
  92. TAROT Observations of GRB 040916 (HETE #3558)
  93. XRF040916, optical observations
  94. XRF040916: Optical Transient Candidate by Subaru
  95. GRB040916 optical limits 17 min after GRB
  96. XRF 040912 (=H3557): Spectral and Temporal Properties
  97. XRF040916, Ic observations
  98. XRF040912, BVRcIc field calibration
  99. XRF040916, BVRcIc field calibration
  100. GRB040916: Archival optical observations

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