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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"

15265 results found.

  1. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  2. XMM-Newton observation of GRB060510b
  3. GRB060522: z = 5.11 Keck-LRIS Redshift
  4. GRB 060522: Swift/XRT Team refined analysis
  5. GRB 060522: REM NIR observations
  6. GRB 060522: TNG optical observations
  7. GRB 060516: Refined analysis of the Swift-BAT burst
  8. GRB 060512: TNG optical spectroscopy
  9. GRB060515: P200 NIR Observations
  10. GRB 060505 BAT refined analysis
  11. GRB 060515 BAT refined analysis
  12. GRB 060515: Super-LOTIS Observations
  13. VLT optical spectroscopy of GRB 060512
  14. GRB 060512: Subaru NIR observation
  15. GRB060512: Swift XRT Team refined analysis
  16. GRB 060512: 1.54m Kuiper Observations
  17. GRB 060512: P60 Observations
  18. GRB 060512: REM NIR observations
  19. GRB060512 - SDSS Pre-Burst Observations
  20. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  21. GRB 060505: X-ray afterglow - Correction -
  22. GRB 060505: X-ray afterglow
  23. Konus-Wind observation of GRB 060510A
  24. GRB 060428a, SMARTS optical/IR afterglow detection
  25. GRB060510B: Swift XRT refined analysis
  26. GRB 060510B: Swift-BAT Refined Analysis
  27. GRB060510 - SDSS Pre-Burst Observations
  28. GRB060510B : Faulkes North Telescope detection
  29. GRB 060510B: Super-LOTIS Observations
  30. GRB 060510B: Coordinate correction
  31. GRB 060510B: MDM Observations and candidate OT
  32. GRB 060510B: Swift detection of a burst
  33. GRB060507: optical afterglow detection
  34. GRB060502B: improvement in the XRT afterglow position
  35. GRB 060507: Swift-BAT Refined Analysis
  36. GRB060507: Swift XRT position
  37. GRB 060429: Suzaku WAM observation
  38. GRB 060505: Swift XRT Team Refined Analysis
  39. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  40. GRB 060505: Swift XRT afterglow canditate position
  41. GRB 060502A: Swift/UVOT source detection
  42. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  43. GRB 060427B Milagro GeV/TeV Observations
  44. GRB 060502B: MASTER optical observations
  45. GRB 060502: APO Spectroscopic Observations
  46. GRB060502: Super-LOTIS Observations
  47. GRB 060501: MDM Observations
  48. GRB060501: Super-LOTIS observations
  49. GRB 060501: ROTSE-III Optical Limits
  50. Konus-Wind observation of GRB 060427B
  51. GRB060428B - SDSS Pre-Burst Observations
  52. GRB 060428B: KAIT observations
  53. GRB060428B, optical observation
  54. GRB 060427: NIR observations
  55. GRB060418: Swift XRT Team Further Refined Analysis
  56. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  57. GRB060424: optical afterglow detection
  58. No OT 060420 in MASCOT images
  59. GRB 060418: prediction of t_break
  60. Konus-Wind observation of GRB 060418
  61. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  62. GRB060418, BVRcIc field calibration
  63. GRB060418: Swift/UVOT Observations
  64. GRB060418: Optical Observations
  65. GRB 060418: FRAM early afterglow observation
  66. GRB 060418, SMARTS optical/IR afterglow observations
  67. GRB060418: Magellan/MIKE Spectroscopic Redshift
  68. GRB060418 : LT optical afterglow observation
  69. GRB 060413: Watcher UBVR observations
  70. GRB060403: XRT refined analysis
  71. Correction to Circular 4938, =H4043, an unusual high energy transient observed by HETE
  72. H4043, an unusual high-energy transient observed by HETE
  73. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  74. GRB 060323: Early optical observation at Xinglong
  75. GRB060218, optical observations
  76. GRB 060322: Confirmation of Swift XRT afterglow
  77. GRB 060211A: optical observation
  78. SGR 1900+14: CORRECTION to GCN 4923
  79. GRB 060322: IAC80 optical observations
  80. GRB 060322: Swift XRT afterglow candidate
  81. GRB 060323: optical afterglow confirmed
  82. GRB060323: NOT observations
  83. GRB 060323: Tautenburg OT candidate retraction
  84. GRB 060323: optical observations at TNG
  85. GRB 060323: Swift XRT refined analysis
  86. GRB 060323: Swift/XRT position
  87. GRB060323 - SDSS Pre-Burst Observations
  88. GRB 060218/SN 2006aj, LNA optical observation
  89. GRB 060319: WHT K-band candidate afterglow
  90. GRB 060319: IAC-80 optical observations
  91. GRB 060319: Re-analysis of TNG data
  92. GRB060319: MASTER limit
  93. GRB060319 : Liverpool Telescope optical limit
  94. GRB060319 - SDSS Pre-burst Observations
  95. GRB 060313: early afterglow NIR upper limits with REM
  96. Konus-Wind observation of GRB 060313
  97. GRB 060313: PROMPT Observations
  98. GRB 060313: Swift/UVOT Observations
  99. GRB 060313: Swift-XRT team refined analysis
  100. GRB060313: optical observations of the afterglow candidate

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