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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"

15264 results found.

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

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