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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"

36203 results found.

  1. GRB 060202 : Kiso B and R band limit
  2. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  3. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  4. GRB 060202: Refined analysis of the Swift-BAT burst
  5. GRB 060202: Swift/UVOT upper limits
  6. GRB 060202: Swift XRT Team Refined Analysis
  7. GRB 060202 : Lulin R and I band limit
  8. GRB060202: Faulkes North observation
  9. GRB 060202: Swift detection of a burst
  10. GRB 060121: Gemini Late-time Observations
  11. Erratum: SDSS pre-burst observations of GRB fields
  12. GRB 060130: PROMPT Observations
  13. GRB 060130: Swift/XRT observation
  14. GRB 051211A: MDM Observations
  15. GRB 060123: Gemini spectroscopy of the putative host galaxy
  16. GRB 060123: VLA Radio Observations
  17. GRB060130: Optical imaging
  18. GRB060130: REM infrared observations
  19. GRB 060130, SMARTS optical observations
  20. GRB 060130: FRAM optical observations
  21. GRB 060130: further INTEGRAL IBIS results
  22. GRB 060130: a long GRB detected with INTEGRAL
  23. Possible GRB 051221B: MDM Correction
  24. GRB050121: optical observation
  25. GRB050121b: optical observation
  26. GRB 060121: Confirmation of NIR Afterglow
  27. GRB060124: optical observation
  28. GRB060124: optical observations
  29. GRB 060123: Swift refined analysis of an unusual GRB
  30. GRB060124, BVRcIc field calibration
  31. GRB060105: refined analysis of the Suzaku observation
  32. GRB060124 optical observations
  33. GRB 060121: Probable Detection of NIR Afterglow
  34. GRB060124: optical observation
  35. GRB 060116 HST observations
  36. GRB 060124: HETE detection and spectrum of the main peak
  37. Refined XRT Position for GRB 060123
  38. Konus-Wind observation of GRB 060124
  39. GRB060124: detailed XRT analysis
  40. GRB 060124 Optical Observations
  41. GRB 060124: ART optical limits during the burst
  42. GRB060123: Optical and IR Imaging
  43. GRB 060123: P200 Observations
  44. GRB 060124: Keck optical spectrum
  45. GRB 060124: Keck Absorption Redshift
  46. GRB 060124: MDM Optical Spectrum
  47. GRB 060124: XRT refined analysis
  48. GRB 060124: R band Observations
  49. GRB 060124 : Optical observation at Xinglong and Kiso
  50. GRB060124: optical observations at Asiago
  51. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  52. GRB060123: SDSS pre-burst observations
  53. GRB 060123: Swift detection of a very long, faint burst
  54. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  55. GRB 060121: OHP optical limits
  56. GRB 060124: TAROT optical limits
  57. GRB 060124: Swift/UVOT Observation
  58. GRB 060124: Confirmation of the Afterglow
  59. GRB 060124: XRT position
  60. GRB 060124: Optical Afterglow Candidate from Tautenburg
  61. GRB 050124 : Kiso Optical limit
  62. GRB 060124: Optical Observations at Tautenburg
  63. GRB 060117: Suzaku WAM observation of the prompt emission
  64. GRB060124:MASTER optical observation
  65. GRB 060111B: Suzaku WAM observation of the prompt emission
  66. GRB 060124: Swift-BAT detection of a burst
  67. GRB 060116: Radio Detection
  68. GRB 060116: MARGE optical observations
  69. GRB 060121: Swift/UVOT upper limits
  70. GRB 060121: Liverpool Telescopes optical limits
  71. GRB 060121: Swift XRT refined analysis
  72. Konus-Wind observation of GRB 060121
  73. GRB 060121: I-band Limits
  74. GRB 060121: Confirmation of Afterglow
  75. GRB 060121: candidate optical counterpart
  76. GRB 060121: Swift XRT refined position
  77. GRB060121: SARA Observations
  78. GRB 060121: optical observations
  79. GRB 060121: Infrared Observations
  80. GRB 060121: optical observations
  81. GRB 060121: Optical imaging
  82. GRB060121 - SDSS pre-burst observations
  83. GRB 060121: A short-hard GRB in a cluster?
  84. GRB 060121 (=H4010): Results of preliminary spectral analysis
  85. GRB 060121: A bright short/hard GRB localized by HETE-2 SXC
  86. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  87. HETE Alert 4006: MASTER promt optical limit
  88. GRB 060117: PROMPT Observations
  89. GRB060117 - ATCA 3/6cm radio limits - correction
  90. GRB060117 - ATCA 3/6cm radio limits
  91. GRB 060116: photometric redshift - the farthest GRB?
  92. GRB 060117: pseudo-z from spectral parameters of the prompt emission
  93. Correction to GCN 4542 on GRB 060117
  94. Konus-Wind observation of GRB 060117
  95. GRB 060116: possible I-J dropout
  96. GRB 060116: UKIRT IR Observations
  97. GRB 060117: Refined analysis of the Swift-BAT burst
  98. GRB 060116: PROMPT Observations
  99. GRB 060117: FRAM refined analysis
  100. GRB 060117: FRAM optical afterglow candidate

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