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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"

21954 results found.

  1. GRB 060203: P60 Confirmation of Optical Afterglow
  2. Possible GRB 060203: candidate optical counterpart
  3. Possible GRB 060203: optical observations at Asiago
  4. GRB 060202: PROMPT Observations
  5. GRB 060202: Gemini-N J, H, K_s observations
  6. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  7. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  8. GRB 060202: Refined analysis of the Swift-BAT burst
  9. GRB 060121: Gemini Late-time Observations
  10. Erratum: SDSS pre-burst observations of GRB fields
  11. GRB 060130: PROMPT Observations
  12. GRB 051211A: MDM Observations
  13. GRB 060123: Gemini spectroscopy of the putative host galaxy
  14. GRB 060123: VLA Radio Observations
  15. GRB060130: REM infrared observations
  16. GRB 060130, SMARTS optical observations
  17. GRB 060130: FRAM optical observations
  18. Possible GRB 051221B: MDM Correction
  19. GRB050121: optical observation
  20. GRB 060121: Confirmation of NIR Afterglow
  21. GRB060124: optical observations
  22. GRB 060123: Swift refined analysis of an unusual GRB
  23. GRB060124 optical observations
  24. GRB 060121: Probable Detection of NIR Afterglow
  25. GRB 060116 HST observations
  26. Refined XRT Position for GRB 060123
  27. GRB 060124 Optical Observations
  28. GRB 060124: ART optical limits during the burst
  29. GRB060123: Optical and IR Imaging
  30. GRB 060123: P200 Observations
  31. GRB 060124: Keck optical spectrum
  32. GRB 060124: MDM Optical Spectrum
  33. GRB 060124: R band Observations
  34. GRB060124: optical observations at Asiago
  35. GRB060123: SDSS pre-burst observations
  36. GRB 060124: Optical Observations at Tautenburg
  37. GRB 060116: Radio Detection
  38. GRB 060116: MARGE optical observations
  39. GRB 060121: Liverpool Telescopes optical limits
  40. GRB 060121: Swift XRT refined analysis
  41. GRB 060121: Confirmation of Afterglow
  42. GRB060121: SARA Observations
  43. GRB 060121: optical observations
  44. GRB 060121: Infrared Observations
  45. GRB 060121: optical observations
  46. GRB 060121: Optical imaging
  47. GRB060121 - SDSS pre-burst observations
  48. GRB 060121: A short-hard GRB in a cluster?
  49. GRB 060117: PROMPT Observations
  50. GRB060117 - ATCA 3/6cm radio limits - correction
  51. GRB060117 - ATCA 3/6cm radio limits
  52. GRB 060116: photometric redshift - the farthest GRB?
  53. GRB 060116: possible I-J dropout
  54. GRB 060116: UKIRT IR Observations
  55. GRB 060116: PROMPT Observations
  56. GRB 060117: FRAM optical afterglow candidate
  57. GRB 060117: nearby galaxy
  58. GRB 060117: Swift-BAT detection of a bright burst
  59. GRB 060116: VLT optical observations
  60. GRB 060115: PROMPT Observations
  61. GRB 060116: IR Candidate Afterglow
  62. GRB060115: REM observations
  63. GRB 060116 : Lulin optical limit
  64. GRB060116: Faulkes North observation
  65. GRB 060115: absorption redshift
  66. GRB 060114: REM observations
  67. GRB 060114: Swift/UVOT Observations
  68. GRB 060114: Swift XRT upper limit
  69. GRB060114: Faulkes North observation
  70. GRB 060108: IR observations of afterglow
  71. GRB 060108: Evidence for an XRT Position Offset
  72. GRB 060110: KAIT observations
  73. GRB 060111B: MITSuME detection of optical afterglow
  74. GRB060111A: RTT150 optical observations
  75. GRB060111B: RTT150, possible host galaxy
  76. GRB 060110: MARGE observations
  77. GRB 060111(a): P60 Observations
  78. GRB 060111B: Gualba observatory limit
  79. GRB 060108: VLT K-band observations
  80. GRB 060111: TAROT optical observation
  81. GRB060111 : XRT refined analysis
  82. GRB 060110: Mitsume optical observations
  83. GRB 060110: UKIRT K-band observations
  84. GRB 060110: IR Candidate Afterglow
  85. GRB 060110: Super-LOTIS observations
  86. GRB 060110: Correction
  87. GRB 050110: IR Observations
  88. GRB 060108: ISAS early observations and near IR upper limit
  89. GRB060108: P200 Ks Observations
  90. GRB 060108: early UKIRT K-band observations
  91. GRB 060108: a dark burst?
  92. GRB 060108: VLT J-band observations
  93. GRB 060108: Mitsume optical observations
  94. GRB060108: SDSS pre-burst observations
  95. GRB060108: Faulkes Telescope observation
  96. GRB 060105: Radio observations
  97. GRB 060105: ISAS observations and near IR upper limit
  98. GRB 060105: Mitsume optical observations
  99. GRB 060102 - no XRT afterglow
  100. GRB051211B: optical observations

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