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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"

36148 results found.

  1. IPN error box for GRB020706
  2. IPN triangulation of GRB020706
  3. GRB 020705: Optical observations
  4. GRB 020625, optical observations
  5. GRB 020625: Optical observations
  6. GRB 020531: optical photometry of Chandra sources
  7. GRB020625 (=H2081): A Long Burst Localized by HETE
  8. The Probable Host Galaxy of GRB/XRF 020427
  9. GRB/XRF 020427, detection of an underlying system with the VLT
  10. GRB 020531, INT+WFC deep optical upper limits
  11. GRB020405: polarimetric observations
  12. GRB 020531, simultaneous optical observations
  13. GRB 020604, optical observations
  14. GRB 020531/Candidate Redshift
  15. GRB020531: Second epoch Chandra observations
  16. GRB020604, optical observations
  17. GRB020604, BVRcIc field photometry
  18. GRB020603, BVRcIc field observations
  19. GRB020531, BVRcIc field photometry
  20. GRB020531 Optical observations with TAROT
  21. GRB020531 Optical observations with TAROT
  22. GRB 020418, optical/near-IR observations
  23. GRB 020531, Radio Observations
  24. IPN triangulation of GRB020604
  25. GRB020531: Observations with the Chandra X-ray Observatory
  26. GRB 020603: Optical Observations
  27. GRB 020603, R-band observation
  28. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  29. GRB 020603: Optical observations
  30. IPN triangulation of GRB020603 (possible short/hard GRB)
  31. GRB 020531 optical observations with TAROT
  32. Refined IPN error box for GRB020531
  33. GRB020531, optical observations
  34. GRB020531(=H2042): Optical Observations
  35. IPN triangulation of the short, hard GRB020531 (=H2042)
  36. GRB020531(=H2042): Optical Observations
  37. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  38. GRB 020525: Optical Observations
  39. GRB020525, optical observations
  40. IPN detection of possible bursts from SGR1806-20
  41. IPN triangulation of GRB020525
  42. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  43. IPN triangulation of a burst from SGR1806-20
  44. GRB/XRF 020427, Radio Observations
  45. HST detection of the likely host galaxy of GRB 020124
  46. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  47. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  48. GRB020321 : Optical observations.
  49. GRB020427 BeppoSAX NFI Observation
  50. XRF 020427
  51. GRB020331: Third Epoch and Revised Second Epoch Optical
  52. The end of BSAX GRB activities
  53. GRB 020410, Radio Observations
  54. GRB 020418: Optical observations
  55. GRB 020124: Optical observations
  56. GRB 020418: Optical observations
  57. IPN triangulation of GRB020418
  58. GRB020405: VLT observations of the OT environment
  59. GRB020410: BeppoSAX NFI observations refined analysis
  60. GRB 020409: Optical Observations
  61. Mars Odyssey joins the IPN
  62. IPN triangulation of GRB020413
  63. GRB 020409, 2-nd epoch optical observations at Terskol.
  64. GRB 020409: Optical observations
  65. GRB 020409, No Optical Detection to R = 22
  66. GRB 020409: No Evidence for an Optical Afterglow
  67. GRB 020409, 2nd epoch optical observations
  68. GRB 020331 Kyoto observation on March 31
  69. GRB 020409
  70. GRB 020409 SARA Observations
  71. GRB "020411"
  72. GRB 020409, No Optical Detection to R = 20
  73. GRB020410: BeppoSAX NFI observation
  74. GRB 020409: Optical observations
  75. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  76. GRB 020410, optical observations
  77. BeppoSAX ALERT: possible GRB020411
  78. GRB 020409, optical observations
  79. GRB 020409: Optical Observations
  80. GRB020406(?), optical observations
  81. GRB020410, optical observations
  82. BeppoSAX ALERT: possible GRB020410
  83. X-ray afterglow of GRB020321
  84. BeppoSAX GRB : GRB020409
  85. GRB020405: VLT optical observations and V band decay slope
  86. GRB020331 optical observations with RIMOTS
  87. GRB020124 optical observations with RIBOTS/RIMOTS
  88. GRB 020321: Candidate X-ray Counterparts
  89. ASM GRB candidate 020406 refined error box
  90. GRB 020405: Moderate-resolution spectroscopy
  91. GRB020406(?), optical observations
  92. GRB020405: VLT optical observations
  93. Revised Photometry of the Optical Afterglow of GRB 020405
  94. GRB020405: OT observations
  95. GRB 020331: Candidate Optical Afterglow
  96. GRB 020405: Decay index
  97. Short RXTE/ASM transient 020406; may be a GRB
  98. GRB020405, Radio Observations
  99. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  100. GRB 020405, U-band observations

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