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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"

26370 results found.

  1. GRB050410: MASTER optical observations
  2. GRB 050408: Inconsistency of host galaxy identification
  3. GRB 050408: Subaru Observations
  4. GRB 050408: WIDGET simultaneous optical observations
  5. GRB 050408: SOAR UBVRc Observations
  6. GRB 050408: Properties of the Host Galaxy
  7. GRB 050408: Mercator Optical Observations
  8. GRB 050408, SMARTS optical/IR afterglow observations
  9. GRB 050408,optical observation
  10. GRB 050408 Optical Observations
  11. GRB 050408: Mercator Optical Observations
  12. GRB 050408: Magellan astrometry and photometry
  13. GRB 050408: steepening of the optical decay
  14. GRB 050408 optical candidate
  15. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  16. GRB050408: MASTER optical observations
  17. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  18. GRB 050406 BAT refined analysis
  19. Konus-Wind observation of GRB 050401
  20. GRB050401: Radio observation at 610 MHz with GMRT
  21. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  22. GRB 050401 Optical Observations
  23. GRB 050401 BAT refined analysis
  24. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  25. GRB 050401: Prompt XRT position
  26. GRB 050331: Swift XRT Position
  27. Konus-Wind observation of GRB 050326
  28. GRB050326: optical limit
  29. GRB050326: optical limit 33min before GRB
  30. GRB 050326 BAT refined analysis
  31. GRB050326: delayed XRT observation
  32. GRB050319, optical observations
  33. GRB050319, color indices
  34. GRB 050319: ROTSE-III Refined Analysis
  35. GRB 050319 R band observations
  36. GRB 050319: Swift-UVOT detection of the afterglow
  37. GRB 050319: NIR afterglow candidate
  38. GRB 050319:Near IR afterglow
  39. GRB 050319: Optical observation
  40. GRB050319,optical observation
  41. Swift Detection of GRB 050319
  42. GRB 050318: Swift/UVOT detection of afterglow emission
  43. GRB050318: Swift XRT position
  44. GRB050223: analysis of the XMM-Newton observation
  45. GRB050316: MASTER before, simultanious and follow up optical
  46. GRB 050306: ROTSE-III early limits
  47. GRB050316: MASTER optical observations
  48. GRB 050315: Swift-BAT further refined analysis
  49. GRB 050315, SMARTS optical/IR afterglow observations
  50. GRB050315: Radio afterglow
  51. GRB 050315: Swift XRT Position
  52. GRB 050315: Early Observations with Swift/UVOT
  53. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  54. GRB 050306: optical afterglow
  55. Swift-BAT trigger 107873: No Swift XRT counterpart
  56. GRB 050306: Confirmation of X-ray afterglow
  57. GRB 050309, Early optical limits from RAPTOR
  58. GRB 050306: further TAROT optical data
  59. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  60. GRB 050306: TAROT optical observations
  61. Ongoing activity of SGR 1806-20 after the giant flare
  62. GRB050215B: Late-Time Swift UVOT Observations
  63. GRB 050126: Confirmation of the NIR afterglow candidate
  64. PROMPT VRcIc Observations of GRB 050223
  65. GRB 050219b: candidate NIR afterglow
  66. IBAS GRB Alert #2321
  67. GRB 050223: optical observations
  68. INTEGRAL detection of GRB 050223
  69. GRB050223: ROTSE-III Optical Observations
  70. GRB050219b: CORRECTION to time of UVOT observations
  71. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  72. GRB 050219b: Swift-BAT detection of a burst
  73. GRB 050219b: CORRECTION: Swift XRT Position
  74. GRB 050219b: Swift XRT Position
  75. GRB 050219a, optical observations
  76. GRB050215b: Swift UVOT Detection of Afterglow Emission
  77. GRB 050215b: XRT confirmation of IR afterglow candidate
  78. GRB050215b: P60 Optical Observations
  79. GRB 050215B: candidate afterglow
  80. GRB 050215b : Lulin follow-up observation
  81. GRB 050215B: UKIRT K-band imaging
  82. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  83. GRB050215A: ROTSE-III Optical Observations
  84. GRB 050209(=U11568): Duration and spectrum
  85. short/hard GRB 050202, optical observations
  86. GRB050209: REM optical observations
  87. GRB 050209 Optical observations
  88. GRB050209: P60 Optical Observations
  89. GRB050209 (=U11568): A Long GRB Detected by HETE
  90. GRB 050202: Second epoch radio observations
  91. GRB050202: Radio Observations
  92. GRB 050202: Short burst detected by Swift-BAT
  93. GRB 050128 Optical observation with REM
  94. GRB 050129: a weak long GRB detected with INTEGRAL
  95. GRB050128: Faulkes Telescope South observations
  96. GRB 050124: Radio Observations
  97. GRB050126: Updated Swift XRT Position
  98. SGR 1806-20: GMRT results at 240 MHz band.
  99. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  100. GRB 050126: Radio Observations

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