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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"

38018 results found.

  1. GRB 041218: Optical observations
  2. GRB 041219 : optical follow-up observations
  3. Deep RAPTOR observations during GRB 041219
  4. GRB 041218 Optical Observations
  5. GRB 041219 Optical Observations
  6. GRB041219c: Third Burst in One Day from Swift-BAT
  7. GRB041219: Optical Afterglow Detection
  8. GRB041219: Continued NIR Observations
  9. GRB 041219 ,optical observation
  10. GRB 041219: Radio Afterglow Detection
  11. GRB 041218 : Radio Observations
  12. GRB 041218: R-band optical observations
  13. GRB041219: Confirmed NIR Afterglow
  14. GRB041218: Continued P60 Optical Observations
  15. GRB 041218: Optical Observation
  16. GRB 041219: Infrared Afterglow Candidate
  17. GRB041219, BVRcIc field calibration
  18. GRB 041219: Infrared Afterglow Candidate
  19. GRB041218, BVRcIc field calibration
  20. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  21. GRB041219: P60 Optical Observations
  22. GRB 041219 - A long GRB detected by INTEGRAL
  23. GRB 041219: PAIRITEL IR Observations, < 3 minutes after trigger
  24. GRB 041217: PROMPT Observations
  25. GRB041218: optical observations
  26. GRB041217: optical limit 30 min after GRB
  27. GRB 041218; optical candidate
  28. GRB 041218: Optical observations
  29. GRB 041217: LCO40 Optical Observations and Possible Candidates
  30. GRB 041218 - A long GRB detected by integral
  31. GRB041217: Optical Observations
  32. GRB041217: P60 Optical Observations
  33. GRB041217: Infrared Observations
  34. GRB041217: The First GRB Located On-Board Swift
  35. GRB041211: Faulkes Telescope continued optical monitoring
  36. Optical Transient in Lynx not a GRB
  37. Optical transient (GRB?) in Lynx
  38. Optical transient (GRB?) in Lynx, UT Dec 11.4436
  39. GRB041211: Continued P60 Observations
  40. GRB041211: RAPTOR observations
  41. GRB041211: Ashra Prototype optical observation
  42. GRB041211, Faulkes Telescope optical observation
  43. GRB041211, BVRcIc field calibration
  44. GRB 041211: Infrared Observations
  45. GRB 041211: KAIT observations
  46. GRB 041211: Optical follow-up in East Asian region
  47. GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC
  48. GRB041211: P60 optical imaging
  49. GRB970815: Discovery of Optical Afterglow
  50. Distribution of IBAS Alerts for NON-GRB sources
  51. Triangulation of short GRB 041116 (large error box)
  52. GRB 040924: Afterglow Color
  53. GRB 041006: GETS Optical Afterglow Observation
  54. Summary of the recent bursts from SGR 1806-20
  55. GRB 041006: Optical Observations
  56. GRB041006, late-time optical photometry
  57. IBAS GRB Alert # 2034
  58. GRB041006: RTT150 Optical Observations
  59. Bright bursts from SGR1806-20
  60. GRB 041016: BOOTES-2 simultaneous observation
  61. GRB041006: RTT150 Optical Observations
  62. GRB 041016: Optical limits
  63. GRB 041016: Optical limits in V, R, I
  64. GRB 041016:Optical limit during first minute
  65. GRB041016: MASTER: Optical observations
  66. GRB 041015: Optical Observations at Rikubetsu
  67. GRB041006: Near Infrared observations
  68. GRB 041016: Optical limit
  69. GRB 041015 R band observations
  70. GRB040924, BVRcIc field calibration
  71. GRB041015: MASTER: Optical observations
  72. GRB041015,optical observation
  73. GRB 041015: Optical limit at Osaka University
  74. GRB041015 : Optical follow-up at Kiso
  75. GRB 041015 - A long GRB detected by INTEGRAL
  76. GRB 041006 R observations in Loiano
  77. GRB041006: VLT observations of the afterglow and host galaxy
  78. GRB041006: Optical observations and Potential host galaxy
  79. GRB041006, BVRcIc field calibration
  80. GRB 040924: VLT spectroscopy
  81. GRB 041006: SARA afterglow observations
  82. Search for SN light in XRF 040912 with MEGACAM
  83. GRB 040916: Afterglow Color at Early Times
  84. GRB 041006 Optical afterglow observations
  85. IBAS GRB Alert # 2010
  86. GRB 041006: BR observations with VATT
  87. GRB 041006: Redshift confirmed
  88. GRB041006: Liverpool Telescope optical observations
  89. GRB 041006: Colour measurement
  90. GRB041006: break in the light curve
  91. GRB 041006: Radio Observations
  92. GRB041006, further submilllimetre observations
  93. GRB 041006 : optical follow-up observation at Lulin Observatory
  94. GRB 041006 : Optical follow-up observation at TAROT
  95. GRB041006: Optical photometry and spectroscopy at TNG
  96. GRB 041006: presice astrometry
  97. GRB041006 (= H3570): Chandra Observations In Progress
  98. GRB 041006 : optical observation at Bisei
  99. GRB041006 (=HETE3570): optical observations
  100. ROTSE-IIIa Observations of GRB 041006

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