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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"

36074 results found.

  1. GRB 060210: Swift detection of a burst
  2. GRB 060206: Swift/UVOT Observations
  3. Swift-BAT trigger 180931 is not a GRB
  4. GRB060209: RTT150 optical observations
  5. GRB 060209 : TAROT optical observation
  6. GRB060209A: MASTER optical observation
  7. GRB 060209(?): Swift-BAT detection of a possible burst
  8. GRB 060206: near-infrared observations (JK' imaging)
  9. GRB 060206: WSRT Radio Observations
  10. GRB 060203: Swift/UVOT upper limits
  11. GRB 060206: TTT Observations
  12. GRB 060206: More PROMPT Detections
  13. GRB 060121 : WIDGET Pre-trigger limit
  14. GRB 060206: Tenagra II Observations
  15. GRB 060206: PROMPT Detections
  16. Retraction of orphan GRB afterglow candidate
  17. GRB060204a: Swift XRT Source is not GRB Afterglow
  18. GRB 060206: optical observations at Asiago
  19. Orphan GRB Afterglow candidate
  20. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  21. GRB 060206: Subaru/FOCAS optical spectroscopy
  22. GRB 060206: IR Detection of the Afterglow
  23. GRB 060206: Lick 3m Spectroscopy
  24. GRB 060204A: ROSAT Pointing
  25. GRB 060206: Super-LOTIS observations
  26. GRB060204A: Swift/UVOT observations
  27. GRB 060206: Swift-BAT refined analysis
  28. GRB 060206 : Lulin optical observations
  29. GRB060206: SDSS Pre-Burst Observations
  30. GRB060206: Swift XRT Refined Analysis
  31. GRB060206: Liverpool Telescope observation
  32. GRB 060206: Spectroscopic Redshift
  33. GRB060206: P60 Optical Observations
  34. GRB 060206: KAIT observations
  35. GRB060206: Swift XRT Position
  36. GRB060206: SARA Detection
  37. GRB 060206: RAPTOR observations of afterglow candidate variability.
  38. GRB 060206: High redshift burst
  39. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  40. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  41. BAT GRB 060204C is probably not a GRB
  42. GRB060204C: optical observation
  43. GRB 060204B: BVRi-band detections of optical afterglow
  44. GRB 060204A: Swift XRT upper limit
  45. GRB 060204A: FRAM optical observations
  46. GRB060204B: Swift/UVOT refined analysis
  47. GRB 060204C: optical observations
  48. Swift XRT Observation of GRB 060204C
  49. GRB 060204B: Swift-BAT refined analysis
  50. GRB 060204B: ART early limit
  51. GRB060204B: Swift XRT Team Refined Analysis
  52. GRB 060204C: OSN limits
  53. GRB 060204b: Keck/LRIS Afterglow Confirmation
  54. GRB 060204C: BOOTES-IR optical limits
  55. GRB 060204C: Liverpool Telescopes optical limit
  56. GRB 060204C: ROTSE-III Optical Limits
  57. GRB 060204C: Swift-BAT detection of a burst
  58. GRB 060124: Radio Observations
  59. GRB060204B: Faulkes OT candidate
  60. GRB 060204B: ART optical limit
  61. GRB 060204A: further INTEGRAL results
  62. GRB060204B - SDSS pre-burst observations
  63. GRB 060203: Swift-BAT refined analysis
  64. GRB 060204B: Swift detection of a burst
  65. GRB 060204: a long GRB detected by INTEGRAL
  66. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  67. GRB 060203: RTT150 optical observations
  68. GRB060203: Swift XRT Team Refined Analysis
  69. Swift-BAT trigger is GRB 060203
  70. GRB 060203: IR Counterpart
  71. GRB060203: Observations with SARA
  72. GRB 060203: P60 Confirmation of Optical Afterglow
  73. Possible GRB 060203: candidate optical counterpart
  74. Possible GRB 060203: optical observations at Asiago
  75. GRB 060202: PROMPT Observations
  76. GRB 060202: GETS observation
  77. GRB 060202: Gemini-N J, H, K_s observations
  78. GRB 060202 : Kiso B and R band limit
  79. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  80. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  81. GRB 060202: Refined analysis of the Swift-BAT burst
  82. GRB 060202: Swift/UVOT upper limits
  83. GRB 060202: Swift XRT Team Refined Analysis
  84. GRB 060202 : Lulin R and I band limit
  85. GRB060202: Faulkes North observation
  86. GRB 060202: Swift detection of a burst
  87. GRB 060121: Gemini Late-time Observations
  88. Erratum: SDSS pre-burst observations of GRB fields
  89. GRB 060130: PROMPT Observations
  90. GRB 060130: Swift/XRT observation
  91. GRB 051211A: MDM Observations
  92. GRB 060123: Gemini spectroscopy of the putative host galaxy
  93. GRB 060123: VLA Radio Observations
  94. GRB060130: Optical imaging
  95. GRB060130: REM infrared observations
  96. GRB 060130, SMARTS optical observations
  97. GRB 060130: FRAM optical observations
  98. GRB 060130: further INTEGRAL IBIS results
  99. GRB 060130: a long GRB detected with INTEGRAL
  100. Possible GRB 051221B: MDM Correction

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