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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"

35258 results found.

  1. GRB060204a: Swift XRT Source is not GRB Afterglow
  2. GRB 060206: optical observations at Asiago
  3. Orphan GRB Afterglow candidate
  4. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  5. GRB 060206: Subaru/FOCAS optical spectroscopy
  6. GRB 060206: IR Detection of the Afterglow
  7. GRB 060206: Lick 3m Spectroscopy
  8. GRB 060204A: ROSAT Pointing
  9. GRB 060206: Super-LOTIS observations
  10. GRB060204A: Swift/UVOT observations
  11. GRB 060206: Swift-BAT refined analysis
  12. GRB 060206 : Lulin optical observations
  13. GRB060206: SDSS Pre-Burst Observations
  14. GRB060206: Swift XRT Refined Analysis
  15. GRB060206: Liverpool Telescope observation
  16. GRB 060206: Spectroscopic Redshift
  17. GRB060206: P60 Optical Observations
  18. GRB 060206: KAIT observations
  19. GRB060206: Swift XRT Position
  20. GRB060206: SARA Detection
  21. GRB 060206: RAPTOR observations of afterglow candidate variability.
  22. GRB 060206: High redshift burst
  23. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  24. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  25. BAT GRB 060204C is probably not a GRB
  26. GRB060204C: optical observation
  27. GRB 060204B: BVRi-band detections of optical afterglow
  28. GRB 060204A: Swift XRT upper limit
  29. GRB 060204A: FRAM optical observations
  30. GRB060204B: Swift/UVOT refined analysis
  31. GRB 060204C: optical observations
  32. Swift XRT Observation of GRB 060204C
  33. GRB 060204B: Swift-BAT refined analysis
  34. GRB 060204B: ART early limit
  35. GRB060204B: Swift XRT Team Refined Analysis
  36. GRB 060204C: OSN limits
  37. GRB 060204b: Keck/LRIS Afterglow Confirmation
  38. GRB 060204C: BOOTES-IR optical limits
  39. GRB 060204C: Liverpool Telescopes optical limit
  40. GRB 060204C: ROTSE-III Optical Limits
  41. GRB 060204C: Swift-BAT detection of a burst
  42. GRB 060124: Radio Observations
  43. GRB060204B: Faulkes OT candidate
  44. GRB 060204B: ART optical limit
  45. GRB 060204A: further INTEGRAL results
  46. GRB060204B - SDSS pre-burst observations
  47. GRB 060203: Swift-BAT refined analysis
  48. GRB 060204B: Swift detection of a burst
  49. GRB 060204: a long GRB detected by INTEGRAL
  50. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  51. GRB 060203: RTT150 optical observations
  52. GRB060203: Swift XRT Team Refined Analysis
  53. Swift-BAT trigger is GRB 060203
  54. GRB 060203: IR Counterpart
  55. GRB060203: Observations with SARA
  56. GRB 060203: P60 Confirmation of Optical Afterglow
  57. Possible GRB 060203: candidate optical counterpart
  58. Possible GRB 060203: optical observations at Asiago
  59. GRB 060202: PROMPT Observations
  60. GRB 060202: GETS observation
  61. GRB 060202: Gemini-N J, H, K_s observations
  62. GRB 060202 : Kiso B and R band limit
  63. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  64. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  65. GRB 060202: Refined analysis of the Swift-BAT burst
  66. GRB 060202: Swift/UVOT upper limits
  67. GRB 060202: Swift XRT Team Refined Analysis
  68. GRB 060202 : Lulin R and I band limit
  69. GRB060202: Faulkes North observation
  70. GRB 060202: Swift detection of a burst
  71. GRB 060121: Gemini Late-time Observations
  72. Erratum: SDSS pre-burst observations of GRB fields
  73. GRB 060130: PROMPT Observations
  74. GRB 060130: Swift/XRT observation
  75. GRB 051211A: MDM Observations
  76. GRB 060123: Gemini spectroscopy of the putative host galaxy
  77. GRB 060123: VLA Radio Observations
  78. GRB060130: Optical imaging
  79. GRB060130: REM infrared observations
  80. GRB 060130, SMARTS optical observations
  81. GRB 060130: FRAM optical observations
  82. GRB 060130: further INTEGRAL IBIS results
  83. GRB 060130: a long GRB detected with INTEGRAL
  84. Possible GRB 051221B: MDM Correction
  85. GRB050121: optical observation
  86. GRB050121b: optical observation
  87. GRB 060121: Confirmation of NIR Afterglow
  88. GRB060124: optical observation
  89. GRB060124: optical observations
  90. GRB 060123: Swift refined analysis of an unusual GRB
  91. GRB060124, BVRcIc field calibration
  92. GRB060105: refined analysis of the Suzaku observation
  93. GRB060124 optical observations
  94. GRB 060121: Probable Detection of NIR Afterglow
  95. GRB060124: optical observation
  96. GRB 060116 HST observations
  97. GRB 060124: HETE detection and spectrum of the main peak
  98. Refined XRT Position for GRB 060123
  99. Konus-Wind observation of GRB 060124
  100. GRB060124: detailed XRT analysis

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