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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"

28236 results found.

  1. GRB060219: SDSS pre-burst observations
  2. GRB 060219: Swift-BAT detection of a weak burst
  3. Oddball GRB 060218, transient or GRB?
  4. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  5. GRB 060218: Pre-burst detection of a possible host galaxy
  6. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  7. GRB 060211B: Swift/UVOT Upper Limits
  8. GRB060218 : SDSS pre-burst observations
  9. GRB 060218: Swift-BAT detection of a possible burst
  10. GRB 060213: optical afterglow not confirmed
  11. Swift UVOT observations of GRB060213
  12. GRB 060211B: Skynet Observations
  13. GRB060213: Swift XRT observations and possible afterglow candidate
  14. GRB 060213: IPN localization
  15. GRB060211B: REM optical and NIR observations
  16. GRB 060211A: Further refined analysis of the Swift burst
  17. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  18. GRB 060211b: P60 Observations
  19. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  20. GRB 050826: Optical Afterglow and Host Galaxy
  21. GRB 060210: Further refined analysis of the Swift-BAT burst
  22. GRB 060211B: Swift/BAT refined analysis
  23. GRB060210: Swift/UVOT Upper Limits
  24. GRB 060211B: Swift-XRT Team refined analysis
  25. GRB 060210: Optical Observations
  26. GRB 060211: Swift detection of a long burst
  27. GRB 060210: Refined analysis of the Swift-BAT burst
  28. GRB060210: Swift XRT Refined Analysis
  29. GRB 060210 : Xinglong and Lulin optical limit
  30. GRB 060210: optical evolution
  31. GRB 060210: Swift detection of a burst
  32. GRB060210: Optical afterglow
  33. GRB 060209 : TAROT optical observation
  34. GRB 060203: Swift/UVOT upper limits
  35. GRB 060121 : WIDGET Pre-trigger limit
  36. GRB060204a: Swift XRT Source is not GRB Afterglow
  37. GRB 060206: optical observations at Asiago
  38. GRB 060206: IR Detection of the Afterglow
  39. GRB 060206: Super-LOTIS observations
  40. GRB060204A: Swift/UVOT observations
  41. GRB 060206: Swift-BAT refined analysis
  42. GRB060206: SDSS Pre-Burst Observations
  43. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  44. GRB060206: Swift-BAT detection of a burst
  45. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  46. GRB060204C: optical observation
  47. GRB 060204A: Swift XRT upper limit
  48. GRB 060204A: FRAM optical observations
  49. GRB060204B: Swift/UVOT refined analysis
  50. GRB 060204C: optical observations
  51. Swift XRT Observation of GRB 060204C
  52. GRB 060204B: Swift-BAT refined analysis
  53. GRB 060204B: ART early limit
  54. GRB 060204b: Keck/LRIS Afterglow Confirmation
  55. GRB 060204C: Liverpool Telescopes optical limit
  56. GRB 060204C: Swift-BAT detection of a burst
  57. GRB 060204A: further INTEGRAL results
  58. GRB060204B, optical observation
  59. GRB060204B - SDSS pre-burst observations
  60. GRB 060203: Swift-BAT refined analysis
  61. GRB 060204B: Swift detection of a burst
  62. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  63. GRB 060203: RTT150 optical observations
  64. GRB 060203: IR Counterpart
  65. Possible GRB 060203: optical observations at Asiago
  66. GRB 060202: PROMPT Observations
  67. GRB 060202: GETS observation
  68. GRB 060202: Gemini-N J, H, K_s observations
  69. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  70. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  71. GRB 060202: Refined analysis of the Swift-BAT burst
  72. GRB060202, optical observation
  73. GRB 060202: Swift/UVOT upper limits
  74. GRB 060121: Gemini Late-time Observations
  75. GRB 060130: PROMPT Observations
  76. GRB060130: Further R-band imaging
  77. GRB 060130: Swift/XRT observation
  78. GRB 060123: Gemini spectroscopy of the putative host galaxy
  79. GRB060130: Optical imaging
  80. GRB060130: REM infrared observations
  81. GRB 060130, SMARTS optical observations
  82. GRB 060130: FRAM optical observations
  83. GRB 060130: further INTEGRAL IBIS results
  84. GRB 060121: Confirmation of NIR Afterglow
  85. GRB 060123: Swift refined analysis of an unusual GRB
  86. GRB060124, BVRcIc field calibration
  87. GRB 060121: Probable Detection of NIR Afterglow
  88. GRB 060116 HST observations
  89. GRB 060124: HETE detection and spectrum of the main peak
  90. GRB060124: detailed XRT analysis
  91. GRB 060124: ART optical limits during the burst
  92. GRB060123: Optical and IR Imaging
  93. GRB 060123: P200 Observations
  94. GRB 060124: XRT refined analysis
  95. GRB 060124: R band Observations
  96. GRB 060124 : Optical observation at Xinglong and Kiso
  97. GRB060124: optical observations at Asiago
  98. GRB060123: SDSS pre-burst observations
  99. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  100. GRB 060121: OHP optical limits

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