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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"

41628 results found.

  1. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  2. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  3. AXP 1E2259+586: quasi-simultaneous optical observation
  4. AXP 1E2259+586 optical observations
  5. Fading Optical Source in the Field of GRB020531
  6. GRB 020531, INT+WFC deep optical upper limits
  7. SGR-like Bursts from the AXP 1E 2259+586
  8. GRB020405: polarimetric observations
  9. GRB 020531, simultaneous optical observations
  10. GRB 020604, optical observations
  11. GRB 020531/Candidate Redshift
  12. GRB020531: Detection of Candidate Host Galaxy
  13. GRB020531: Second epoch Chandra observations
  14. GRB020604, optical observations
  15. GRB020604, BVRcIc field photometry
  16. GRB020603, BVRcIc field observations
  17. GRB020531, BVRcIc field photometry
  18. GRB020531 Optical observations with TAROT
  19. GRB020531 Optical observations with TAROT
  20. GRB 020418, optical/near-IR observations
  21. GRB 020531, Radio Observations
  22. GRB020531 Optical Observations
  23. GRB020531: Observations with the Chandra X-ray Observatory
  24. GRB 020603: Optical Observations
  25. GRB 020603, R-band observation
  26. GRB020531: Upper Limit for Detection of Two TAROT Sources
  27. GRB 020603: Optical observations
  28. GRB 020531 optical observations with TAROT
  29. Refined IPN error box for GRB020531
  30. GRB020531, optical observations
  31. GRB020531: optical observations
  32. GRB020531(=H2042): Optical Observations
  33. GRB020531(=H2042): Optical Observations
  34. GRB020531: Optical observations
  35. GRB 020525: Optical Observations
  36. GRB020525, optical observations
  37. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  38. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  39. IPN triangulation of a burst from SGR1806-20
  40. GRB/XRF 020427, Radio Observations
  41. HST detection of the likely host galaxy of GRB 020124
  42. GRB020405 field photometry at ESO
  43. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  44. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  45. GRB020321 : Optical observations.
  46. GRB020427 BeppoSAX NFI Observation
  47. XRF 020427
  48. GRB020331: Third Epoch and Revised Second Epoch Optical
  49. The end of BSAX GRB activities
  50. GRB 020410, Radio Observations
  51. GRB 020418: Optical observations
  52. GRB 020124: Optical observations
  53. GRB 020418: Optical observations
  54. IPN triangulation of GRB020418
  55. GRB020405: VLT observations of the OT environment
  56. GRB020410: BeppoSAX NFI observations refined analysis
  57. GRB 020409: Optical Observations
  58. Mars Odyssey joins the IPN
  59. IPN triangulation of GRB020413
  60. GRB 020409, 2-nd epoch optical observations at Terskol.
  61. GRB020405: predicted break
  62. GRB 020409: Optical observations
  63. GRB020410: second BeppoSAX NFI observation
  64. GRB 020409, 2nd epoch optical observations
  65. GRB 020331 Kyoto observation on March 31
  66. GRB 020409
  67. GRB 020409 SARA Observations
  68. GRB "020411"
  69. GRB 020409, No Optical Detection to R = 20
  70. GRB 020409: Optical observations
  71. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  72. GRB 020410, optical observations
  73. GRB 020409, optical observations
  74. GRB 020409: Optical Observations
  75. GRB020406(?), optical observations
  76. GRB020410, optical observations
  77. BeppoSAX GRB : GRB020409
  78. GRB020331: Confirmation of Afterglow Candidate with Magellan
  79. GRB020405: VLT optical observations and V band decay slope
  80. GRB020331 optical observations with RIMOTS
  81. GRB020124 optical observations with RIBOTS/RIMOTS
  82. GRB 020321: Candidate X-ray Counterparts
  83. ASM GRB candidate 020406 refined error box
  84. GRB 020405: Moderate-resolution spectroscopy
  85. GRB020331: Optical Observations of Afterglow Candidate
  86. GRB020406(?), optical observations
  87. GRB020405: VLT optical observations
  88. Revised Photometry of the Optical Afterglow of GRB 020405
  89. GRB020405: OT observations
  90. GRB 020331: Candidate Optical Afterglow
  91. GRB 020405: Decay index
  92. Short RXTE/ASM transient 020406; may be a GRB
  93. GRB020405, Radio Observations
  94. GRB020405: VLT spectroscopy
  95. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  96. V band observations of GRB020405
  97. GRB 020405, U-band observations
  98. GRB 020405: Optical afterglow candidate
  99. IPN localization of GRB020405
  100. GRB011212: Optical Observations

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