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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

35988 results found.

  1. GRB 060121: Gemini Late-time Observations
  2. Erratum: SDSS pre-burst observations of GRB fields
  3. GRB 060130: PROMPT Observations
  4. GRB 060130: Swift/XRT observation
  5. GRB 051211A: MDM Observations
  6. GRB 060123: Gemini spectroscopy of the putative host galaxy
  7. GRB 060123: VLA Radio Observations
  8. GRB060130: Optical imaging
  9. GRB060130: REM infrared observations
  10. GRB 060130, SMARTS optical observations
  11. GRB 060130: FRAM optical observations
  12. GRB 060130: further INTEGRAL IBIS results
  13. GRB 060130: a long GRB detected with INTEGRAL
  14. Possible GRB 051221B: MDM Correction
  15. GRB050121: optical observation
  16. GRB050121b: optical observation
  17. GRB 060121: Confirmation of NIR Afterglow
  18. GRB060124: optical observation
  19. GRB060124: optical observations
  20. GRB 060123: Swift refined analysis of an unusual GRB
  21. GRB060124, BVRcIc field calibration
  22. GRB060105: refined analysis of the Suzaku observation
  23. GRB060124 optical observations
  24. GRB 060121: Probable Detection of NIR Afterglow
  25. GRB060124: optical observation
  26. GRB 060116 HST observations
  27. GRB 060124: HETE detection and spectrum of the main peak
  28. Refined XRT Position for GRB 060123
  29. Konus-Wind observation of GRB 060124
  30. GRB060124: detailed XRT analysis
  31. GRB 060124 Optical Observations
  32. GRB 060124: ART optical limits during the burst
  33. GRB060123: Optical and IR Imaging
  34. GRB 060123: P200 Observations
  35. GRB 060124: Keck optical spectrum
  36. GRB 060124: Keck Absorption Redshift
  37. GRB 060124: MDM Optical Spectrum
  38. GRB 060124: XRT refined analysis
  39. GRB 060124: R band Observations
  40. GRB 060124 : Optical observation at Xinglong and Kiso
  41. GRB060124: optical observations at Asiago
  42. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  43. GRB060123: SDSS pre-burst observations
  44. GRB 060123: Swift detection of a very long, faint burst
  45. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  46. GRB 060121: OHP optical limits
  47. GRB 060124: TAROT optical limits
  48. GRB 060124: Swift/UVOT Observation
  49. GRB 060124: Confirmation of the Afterglow
  50. GRB 060124: XRT position
  51. GRB 060124: Optical Afterglow Candidate from Tautenburg
  52. GRB 050124 : Kiso Optical limit
  53. GRB 060124: Optical Observations at Tautenburg
  54. GRB 060117: Suzaku WAM observation of the prompt emission
  55. GRB060124:MASTER optical observation
  56. GRB 060111B: Suzaku WAM observation of the prompt emission
  57. GRB 060124: Swift-BAT detection of a burst
  58. GRB 060116: Radio Detection
  59. GRB 060116: MARGE optical observations
  60. GRB 060121: Swift/UVOT upper limits
  61. GRB 060121: Liverpool Telescopes optical limits
  62. GRB 060121: Swift XRT refined analysis
  63. Konus-Wind observation of GRB 060121
  64. GRB 060121: I-band Limits
  65. GRB 060121: Confirmation of Afterglow
  66. GRB 060121: candidate optical counterpart
  67. GRB 060121: Swift XRT refined position
  68. GRB060121: SARA Observations
  69. GRB 060121: optical observations
  70. GRB 060121: Infrared Observations
  71. GRB 060121: optical observations
  72. GRB 060121: Optical imaging
  73. GRB060121 - SDSS pre-burst observations
  74. GRB 060121: A short-hard GRB in a cluster?
  75. GRB 060121 (=H4010): Results of preliminary spectral analysis
  76. GRB 060121: A bright short/hard GRB localized by HETE-2 SXC
  77. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  78. HETE Alert 4006: MASTER promt optical limit
  79. GRB 060117: PROMPT Observations
  80. GRB060117 - ATCA 3/6cm radio limits - correction
  81. GRB060117 - ATCA 3/6cm radio limits
  82. GRB 060116: photometric redshift - the farthest GRB?
  83. GRB 060117: pseudo-z from spectral parameters of the prompt emission
  84. Correction to GCN 4542 on GRB 060117
  85. Konus-Wind observation of GRB 060117
  86. GRB 060116: possible I-J dropout
  87. GRB 060116: UKIRT IR Observations
  88. GRB 060117: Refined analysis of the Swift-BAT burst
  89. GRB 060116: PROMPT Observations
  90. GRB 060117: FRAM refined analysis
  91. GRB 060117: FRAM optical afterglow candidate
  92. GRB 060117: nearby galaxy
  93. GRB 060117: Swift-BAT detection of a bright burst
  94. GRB 060116: VLT optical observations
  95. GRB 060116: Refined analysis of the Swift-BAT burst
  96. GRB 060115: PROMPT Observations
  97. GRB 060116: XRT refined analysis
  98. GRB 060116: IR Candidate Afterglow
  99. GRB 060116: Swift/UVOT upper limits
  100. GRB060115: REM observations

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