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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"

36359 results found.

  1. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  2. GRB 020603: Optical observations
  3. IPN triangulation of GRB020603 (possible short/hard GRB)
  4. GRB 020531 optical observations with TAROT
  5. Refined IPN error box for GRB020531
  6. GRB020531, optical observations
  7. GRB020531(=H2042): Optical Observations
  8. IPN triangulation of the short, hard GRB020531 (=H2042)
  9. GRB020531(=H2042): Optical Observations
  10. GRB020531: Optical observations
  11. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  12. GRB 020525: Optical Observations
  13. GRB020525, optical observations
  14. IPN detection of possible bursts from SGR1806-20
  15. IPN triangulation of GRB020525
  16. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  17. IPN triangulation of a burst from SGR1806-20
  18. GRB/XRF 020427, Radio Observations
  19. HST detection of the likely host galaxy of GRB 020124
  20. GRB020405 field photometry at ESO
  21. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  22. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  23. GRB020321 : Optical observations.
  24. GRB020427 BeppoSAX NFI Observation
  25. XRF 020427
  26. GRB020331: Third Epoch and Revised Second Epoch Optical
  27. The end of BSAX GRB activities
  28. GRB 020410, Radio Observations
  29. GRB 020418: Optical observations
  30. GRB 020124: Optical observations
  31. GRB 020418: Optical observations
  32. IPN triangulation of GRB020418
  33. GRB020405: VLT observations of the OT environment
  34. GRB020410: BeppoSAX NFI observations refined analysis
  35. GRB 020409: Optical Observations
  36. Mars Odyssey joins the IPN
  37. IPN triangulation of GRB020413
  38. GRB 020409, 2-nd epoch optical observations at Terskol.
  39. GRB 020409: Optical observations
  40. GRB 020409, No Optical Detection to R = 22
  41. GRB020410: second BeppoSAX NFI observation
  42. GRB 020409: No Evidence for an Optical Afterglow
  43. GRB 020409, 2nd epoch optical observations
  44. GRB 020331 Kyoto observation on March 31
  45. GRB 020409
  46. GRB 020409 SARA Observations
  47. GRB "020411"
  48. GRB 020409, No Optical Detection to R = 20
  49. GRB020410: BeppoSAX NFI observation
  50. GRB 020409: Optical observations
  51. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  52. GRB 020410, optical observations
  53. BeppoSAX ALERT: possible GRB020411
  54. GRB 020409, optical observations
  55. GRB 020409: Optical Observations
  56. GRB020406(?), optical observations
  57. GRB020410, optical observations
  58. BeppoSAX ALERT: possible GRB020410
  59. X-ray afterglow of GRB020321
  60. BeppoSAX GRB : GRB020409
  61. GRB020331: Confirmation of Afterglow Candidate with Magellan
  62. GRB020405: VLT optical observations and V band decay slope
  63. GRB020331 optical observations with RIMOTS
  64. GRB020124 optical observations with RIBOTS/RIMOTS
  65. GRB 020321: Candidate X-ray Counterparts
  66. ASM GRB candidate 020406 refined error box
  67. GRB 020405: Moderate-resolution spectroscopy
  68. GRB020406(?), optical observations
  69. GRB020405: VLT optical observations
  70. Revised Photometry of the Optical Afterglow of GRB 020405
  71. GRB020405: OT observations
  72. GRB 020331: Candidate Optical Afterglow
  73. GRB 020405: Decay index
  74. Short RXTE/ASM transient 020406; may be a GRB
  75. GRB020405, Radio Observations
  76. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  77. GRB 020405, U-band observations
  78. GRB 020405: Optical afterglow candidate
  79. IPN localization of GRB020405
  80. GRB011212: Optical Observations
  81. GRB 020331: NIR Observations
  82. GRB 020331: NIR Observations
  83. GRB020331 NIR observation at KPNO (re-submission)
  84. GRB02033 NIR observation at KPNO
  85. GRB020331 field photometry
  86. GRB 020331 Optical Observations
  87. GRB 020331, NIR observations
  88. GRB 020331: Optical observations
  89. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  90. GRB 020321: Infrared observations
  91. GRB 020322: BeppoSAX observations of the X-ray afterglow
  92. SN 2002ap - peak brightness date (SN/GRB?)
  93. GRB 020322, Radio observations
  94. Near-Infrared Observations of GRB020322 at TIRGO
  95. GRB 020321, Radio Observations
  96. GRB 020322: Optical Observations
  97. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  98. GRB 020321: Optical observations
  99. GRB020317 BVRI field photometry
  100. GRB011211 revised BVRI field photometry

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