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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"

37676 results found.

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

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