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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"

28047 results found.

  1. GRB/XRF 020427, detection of an underlying system with the VLT
  2. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  3. AXP 1E2259+586 optical observations
  4. Fading Optical Source in the Field of GRB020531
  5. GRB 020531, INT+WFC deep optical upper limits
  6. SGR-like Bursts from the AXP 1E 2259+586
  7. GRB020405: polarimetric observations
  8. GRB 020531, simultaneous optical observations
  9. GRB 020531/Candidate Redshift
  10. GRB020531: Detection of Candidate Host Galaxy
  11. GRB020531: Second epoch Chandra observations
  12. GRB020604, optical observations
  13. GRB020604, BVRcIc field photometry
  14. GRB020603, BVRcIc field observations
  15. GRB020531, BVRcIc field photometry
  16. GRB020531 Optical Observations
  17. GRB020531: Observations with the Chandra X-ray Observatory
  18. GRB020531, optical observations
  19. GRB020531: optical observations
  20. GRB020531(=H2042): Optical Observations
  21. GRB020531(=H2042): Optical Observations
  22. GRB020531: Optical observations
  23. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  24. GRB020525, optical observations
  25. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  26. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  27. HST detection of the likely host galaxy of GRB 020124
  28. GRB020405 field photometry at ESO
  29. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  30. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  31. GRB020321 : Optical observations.
  32. XRF 020427
  33. GRB 020124: Optical observations
  34. IPN triangulation of GRB020418
  35. GRB020405: VLT observations of the OT environment
  36. IPN triangulation of GRB020413
  37. GRB020405: predicted break
  38. GRB 020409: No Evidence for an Optical Afterglow
  39. GRB 020331 Kyoto observation on March 31
  40. GRB020410: BeppoSAX NFI observation
  41. X-ray afterglow of GRB020321
  42. GRB020331 optical observations with RIMOTS
  43. GRB020124 optical observations with RIBOTS/RIMOTS
  44. GRB 020321: Candidate X-ray Counterparts
  45. GRB020406(?), optical observations
  46. GRB 020405: Decay index
  47. Short RXTE/ASM transient 020406; may be a GRB
  48. GRB020405, Radio Observations
  49. GRB 020405, U-band observations
  50. GRB011212: Optical Observations
  51. GRB 020331: NIR Observations
  52. GRB020331 NIR observation at KPNO (re-submission)
  53. GRB02033 NIR observation at KPNO
  54. GRB020331 field photometry
  55. GRB 020331, NIR observations
  56. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  57. GRB 020322: BeppoSAX observations of the X-ray afterglow
  58. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  59. Near-Infrared Observations of GRB020322 at TIRGO
  60. GRB 020321, Radio Observations
  61. GRB 020322: Optical Observations
  62. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  63. GRB 020321: Optical observations
  64. GRB020317 BVRI field photometry
  65. GRB011211 revised BVRI field photometry
  66. GRB020305 BVRI field photometry
  67. GRB020322 BVRI field photometry
  68. GRB 020322: Optical Sources and Improved Astrometry
  69. GRB020317: optical observations
  70. GRB020321 optical observations
  71. GRB020321: a faint BeppoSAX detection
  72. GRB 020317 : KISO Optical Observations
  73. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  74. GRB 020305: Optical Observations
  75. GRB020317, optical observations
  76. GRB 020317: Optical observations
  77. GRB 011121: Third HST Epoch
  78. GRB020305: Properties of the Candidate Optical Afterglow
  79. GRB 011121: HST Observations reveal an intermediate-time multicolor
  80. GRB011130 (XRF011130) Second Epoch Chandra Observations
  81. GRB020305: Subaru Optical Observations
  82. XRF/GRB 011030: Detection of the Probable Host Galaxy
  83. GRB 020305: Candidate optical afterglow
  84. GRB020305, optical observations
  85. IPN triangulation of GRB020305 (HETE 1939)
  86. GRB020305 (=H1939): Localization of a GRB by HETE
  87. HST Imaging of the afterglow and host of GRB 011121
  88. IPN detection and localization of Cygnus X-1 flares
  89. SGR1900+14 activity
  90. IPN Upper Limits to a GRB Associated With SN2002ap
  91. GRB020124 BVRI field photometry
  92. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  93. SN2002ap (SN/GRB?) Echelle spectra
  94. GRB020127 Optical Observations
  95. SN 2002ap in M74
  96. SN2002ap (SN/GRB?) UBVRI Field Photometry
  97. GRB020127: Chandra Observations and Prospective Counterparts
  98. pre-SN2002ap (SN/GRB?) imaging of M74
  99. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  100. GRB020124, optical observations

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