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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"

37950 results found.

  1. IPN triangulation of GRB020714
  2. IPN triangulation of GRB150702
  3. GRB 020410: Discovery of Probable OT by HST
  4. GRB 020124, HST observations of the fading afterglow
  5. IPN triangulation of GRB020708
  6. IPN triangulation of GRB020708
  7. IPN error box for GRB020706
  8. IPN triangulation of GRB020706
  9. GRB 020705: Optical observations
  10. GRB 020625, optical observations
  11. GRB 020625: Optical observations
  12. GRB 020531: optical photometry of Chandra sources
  13. GRB020625 (=H2081): A Long Burst Localized by HETE
  14. The Probable Host Galaxy of GRB/XRF 020427
  15. GRB/XRF 020427, detection of an underlying system with the VLT
  16. GRB 020531, INT+WFC deep optical upper limits
  17. GRB020405: polarimetric observations
  18. GRB 020531, simultaneous optical observations
  19. GRB 020604, optical observations
  20. GRB 020531/Candidate Redshift
  21. GRB020531: Second epoch Chandra observations
  22. GRB020604, optical observations
  23. GRB020604, BVRcIc field photometry
  24. GRB020603, BVRcIc field observations
  25. GRB020531, BVRcIc field photometry
  26. GRB020531 Optical observations with TAROT
  27. GRB020531 Optical observations with TAROT
  28. GRB 020418, optical/near-IR observations
  29. GRB 020531, Radio Observations
  30. IPN triangulation of GRB020604
  31. GRB020531: Observations with the Chandra X-ray Observatory
  32. GRB 020603: Optical Observations
  33. GRB 020603, R-band observation
  34. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  35. GRB 020603: Optical observations
  36. IPN triangulation of GRB020603 (possible short/hard GRB)
  37. GRB 020531 optical observations with TAROT
  38. Refined IPN error box for GRB020531
  39. GRB020531, optical observations
  40. GRB020531(=H2042): Optical Observations
  41. IPN triangulation of the short, hard GRB020531 (=H2042)
  42. GRB020531(=H2042): Optical Observations
  43. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  44. GRB 020525: Optical Observations
  45. GRB020525, optical observations
  46. IPN detection of possible bursts from SGR1806-20
  47. IPN triangulation of GRB020525
  48. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  49. IPN triangulation of a burst from SGR1806-20
  50. GRB/XRF 020427, Radio Observations
  51. HST detection of the likely host galaxy of GRB 020124
  52. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  53. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  54. GRB020321 : Optical observations.
  55. GRB020427 BeppoSAX NFI Observation
  56. XRF 020427
  57. GRB020331: Third Epoch and Revised Second Epoch Optical
  58. The end of BSAX GRB activities
  59. GRB 020410, Radio Observations
  60. GRB 020418: Optical observations
  61. GRB 020124: Optical observations
  62. GRB 020418: Optical observations
  63. IPN triangulation of GRB020418
  64. GRB020405: VLT observations of the OT environment
  65. GRB020410: BeppoSAX NFI observations refined analysis
  66. GRB 020409: Optical Observations
  67. Mars Odyssey joins the IPN
  68. IPN triangulation of GRB020413
  69. GRB 020409, 2-nd epoch optical observations at Terskol.
  70. GRB 020409: Optical observations
  71. GRB 020409, No Optical Detection to R = 22
  72. GRB 020409: No Evidence for an Optical Afterglow
  73. GRB 020409, 2nd epoch optical observations
  74. GRB 020331 Kyoto observation on March 31
  75. GRB 020409
  76. GRB 020409 SARA Observations
  77. GRB "020411"
  78. GRB 020409, No Optical Detection to R = 20
  79. GRB020410: BeppoSAX NFI observation
  80. GRB 020409: Optical observations
  81. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  82. GRB 020410, optical observations
  83. BeppoSAX ALERT: possible GRB020411
  84. GRB 020409, optical observations
  85. GRB 020409: Optical Observations
  86. GRB020406(?), optical observations
  87. GRB020410, optical observations
  88. BeppoSAX ALERT: possible GRB020410
  89. X-ray afterglow of GRB020321
  90. BeppoSAX GRB : GRB020409
  91. GRB020405: VLT optical observations and V band decay slope
  92. GRB020331 optical observations with RIMOTS
  93. GRB020124 optical observations with RIBOTS/RIMOTS
  94. GRB 020321: Candidate X-ray Counterparts
  95. ASM GRB candidate 020406 refined error box
  96. GRB 020405: Moderate-resolution spectroscopy
  97. GRB020406(?), optical observations
  98. GRB020405: VLT optical observations
  99. Revised Photometry of the Optical Afterglow of GRB 020405
  100. GRB020405: OT observations

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