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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"

37682 results found.

  1. Optical transient (GRB?) in Lynx
  2. Optical transient (GRB?) in Lynx, UT Dec 11.4436
  3. GRB041211: Continued P60 Observations
  4. GRB041211: RAPTOR observations
  5. GRB041211: Ashra Prototype optical observation
  6. GRB041211, Faulkes Telescope optical observation
  7. GRB041211, BVRcIc field calibration
  8. GRB 041211: Infrared Observations
  9. GRB 041211: KAIT observations
  10. GRB 041211: Optical follow-up in East Asian region
  11. GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC
  12. GRB041211: P60 optical imaging
  13. GRB970815: Discovery of Optical Afterglow
  14. Distribution of IBAS Alerts for NON-GRB sources
  15. Triangulation of short GRB 041116 (large error box)
  16. GRB 040924: Afterglow Color
  17. GRB 041006: GETS Optical Afterglow Observation
  18. Summary of the recent bursts from SGR 1806-20
  19. GRB 041006: Optical Observations
  20. GRB041006, late-time optical photometry
  21. IBAS GRB Alert # 2034
  22. GRB041006: RTT150 Optical Observations
  23. Bright bursts from SGR1806-20
  24. GRB 041016: BOOTES-2 simultaneous observation
  25. GRB041006: RTT150 Optical Observations
  26. GRB 041016: Optical limits
  27. GRB 041016: Optical limits in V, R, I
  28. GRB 041016:Optical limit during first minute
  29. GRB041016: MASTER: Optical observations
  30. GRB 041015: Optical Observations at Rikubetsu
  31. GRB041006: Near Infrared observations
  32. GRB 041016: Optical limit
  33. GRB 041015 R band observations
  34. GRB040924, BVRcIc field calibration
  35. GRB041015: MASTER: Optical observations
  36. GRB041015,optical observation
  37. GRB 041015: Optical limit at Osaka University
  38. GRB041015 : Optical follow-up at Kiso
  39. GRB 041015 - A long GRB detected by INTEGRAL
  40. GRB 041006 R observations in Loiano
  41. GRB041006: VLT observations of the afterglow and host galaxy
  42. GRB041006: Optical observations and Potential host galaxy
  43. GRB041006, BVRcIc field calibration
  44. GRB 040924: VLT spectroscopy
  45. GRB 041006: SARA afterglow observations
  46. Search for SN light in XRF 040912 with MEGACAM
  47. GRB 040916: Afterglow Color at Early Times
  48. GRB 041006 Optical afterglow observations
  49. IBAS GRB Alert # 2010
  50. GRB 041006: BR observations with VATT
  51. GRB 041006: Redshift confirmed
  52. GRB041006: Liverpool Telescope optical observations
  53. GRB 041006: Colour measurement
  54. GRB041006: break in the light curve
  55. GRB 041006: Radio Observations
  56. GRB041006, further submilllimetre observations
  57. GRB 041006 : optical follow-up observation at Lulin Observatory
  58. GRB 041006 : Optical follow-up observation at TAROT
  59. GRB041006: Optical photometry and spectroscopy at TNG
  60. GRB 041006: presice astrometry
  61. GRB041006 (= H3570): Chandra Observations In Progress
  62. GRB 041006 : optical observation at Bisei
  63. GRB041006 (=HETE3570): optical observations
  64. ROTSE-IIIa Observations of GRB 041006
  65. GRB041006, submillimetre observations
  66. GRB041006: MASTER optical observations
  67. GRB 041006: Optical decay
  68. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  69. GRB 041006 : Optical follow-up observation at KISO
  70. GRB 041006: Finding chart
  71. GRB 041006: Optical afterglow candidate
  72. XRF 020903: Observations of the Host Galaxy (authors)
  73. GRB 040924: Second Epoch WSRT Radio Observations
  74. radio observations, GRB 040924
  75. IBAS Alert 1991. Not a real GRB
  76. GRB040929,optical observation
  77. GRB040924,optical observation
  78. GRB040924, RTT150 optical observation
  79. GRB 040924: detection of possible host galaxy by Subaru
  80. GRB040924, RTT150 optical observation
  81. GRB040924: KAIT observations
  82. GRB040924: Afterglow magnitude at t=17.5hr
  83. GRB 040924: WSRT Radio Observations
  84. GRB 040924: NIR finding chart
  85. GRB040924 : Optical candidate observations at Lulin observatory
  86. GRB040924 : Optical candidate observations at Lulin observatory
  87. GRB 040924: Subaru NIR observation
  88. GRB 040924: RTT150 optical observations
  89. GRB 040924, optical follow-up
  90. IPN triangulation of GRB040924 (H3564)
  91. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  92. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  93. XRF040916: continuing decay of OT
  94. TAROT Observations of GRB 040916 (HETE #3558)
  95. XRF040916, optical observations
  96. XRF040916: Optical Transient Candidate by Subaru
  97. GRB040916 optical limits 17 min after GRB
  98. XRF 040912 (=H3557): Spectral and Temporal Properties
  99. XRF040916, Ic observations
  100. XRF040912, BVRcIc field calibration

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