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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"

35431 results found.

  1. GRB020603, BVRcIc field observations
  2. GRB020531, BVRcIc field photometry
  3. GRB020531 Optical observations with TAROT
  4. GRB020531 Optical observations with TAROT
  5. GRB 020418, optical/near-IR observations
  6. GRB 020531, Radio Observations
  7. IPN triangulation of GRB020604
  8. GRB020531: Observations with the Chandra X-ray Observatory
  9. GRB 020603: Optical Observations
  10. GRB 020603, R-band observation
  11. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  12. GRB 020603: Optical observations
  13. IPN triangulation of GRB020603 (possible short/hard GRB)
  14. GRB 020531 optical observations with TAROT
  15. Refined IPN error box for GRB020531
  16. GRB020531, optical observations
  17. GRB020531(=H2042): Optical Observations
  18. IPN triangulation of the short, hard GRB020531 (=H2042)
  19. GRB020531(=H2042): Optical Observations
  20. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  21. GRB 020525: Optical Observations
  22. GRB020525, optical observations
  23. IPN detection of possible bursts from SGR1806-20
  24. IPN triangulation of GRB020525
  25. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  26. IPN triangulation of a burst from SGR1806-20
  27. GRB/XRF 020427, Radio Observations
  28. HST detection of the likely host galaxy of GRB 020124
  29. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  30. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  31. GRB020321 : Optical observations.
  32. GRB020427 BeppoSAX NFI Observation
  33. XRF 020427
  34. GRB020331: Third Epoch and Revised Second Epoch Optical
  35. The end of BSAX GRB activities
  36. GRB 020410, Radio Observations
  37. GRB 020418: Optical observations
  38. GRB 020124: Optical observations
  39. GRB 020418: Optical observations
  40. IPN triangulation of GRB020418
  41. GRB020405: VLT observations of the OT environment
  42. GRB020410: BeppoSAX NFI observations refined analysis
  43. GRB 020409: Optical Observations
  44. Mars Odyssey joins the IPN
  45. IPN triangulation of GRB020413
  46. GRB 020409, 2-nd epoch optical observations at Terskol.
  47. GRB 020409: Optical observations
  48. GRB 020409, No Optical Detection to R = 22
  49. GRB 020409: No Evidence for an Optical Afterglow
  50. GRB 020409, 2nd epoch optical observations
  51. GRB 020331 Kyoto observation on March 31
  52. GRB 020409
  53. GRB 020409 SARA Observations
  54. GRB "020411"
  55. GRB 020409, No Optical Detection to R = 20
  56. GRB020410: BeppoSAX NFI observation
  57. GRB 020409: Optical observations
  58. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  59. GRB 020410, optical observations
  60. BeppoSAX ALERT: possible GRB020411
  61. GRB 020409, optical observations
  62. GRB 020409: Optical Observations
  63. GRB020406(?), optical observations
  64. GRB020410, optical observations
  65. BeppoSAX ALERT: possible GRB020410
  66. X-ray afterglow of GRB020321
  67. BeppoSAX GRB : GRB020409
  68. GRB020405: VLT optical observations and V band decay slope
  69. GRB020331 optical observations with RIMOTS
  70. GRB020124 optical observations with RIBOTS/RIMOTS
  71. GRB 020321: Candidate X-ray Counterparts
  72. ASM GRB candidate 020406 refined error box
  73. GRB 020405: Moderate-resolution spectroscopy
  74. GRB020406(?), optical observations
  75. GRB020405: VLT optical observations
  76. Revised Photometry of the Optical Afterglow of GRB 020405
  77. GRB020405: OT observations
  78. GRB 020331: Candidate Optical Afterglow
  79. GRB 020405: Decay index
  80. Short RXTE/ASM transient 020406; may be a GRB
  81. GRB020405, Radio Observations
  82. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  83. GRB 020405, U-band observations
  84. GRB 020405: Optical afterglow candidate
  85. IPN localization of GRB020405
  86. GRB011212: Optical Observations
  87. GRB 020331: NIR Observations
  88. GRB 020331: NIR Observations
  89. GRB020331 NIR observation at KPNO (re-submission)
  90. GRB02033 NIR observation at KPNO
  91. GRB020331 field photometry
  92. GRB 020331 Optical Observations
  93. GRB 020331, NIR observations
  94. GRB 020331: Optical observations
  95. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  96. GRB 020321: Infrared observations
  97. GRB 020322: BeppoSAX observations of the X-ray afterglow
  98. SN 2002ap - peak brightness date (SN/GRB?)
  99. GRB 020322, Radio observations
  100. Near-Infrared Observations of GRB020322 at TIRGO

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