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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"

20385 results found.

  1. GRB 020714, optical observations
  2. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  3. HST Imaging of the Host of GRB 011121
  4. GRB020801, optical afterglow candidate
  5. GRB020331: Late-time Optical Light Curve (re-submission)
  6. GRB020331: Late-time Optical Light Curve
  7. IPN triangulation of GRB020714
  8. IPN triangulation of GRB150702
  9. GRB 020410: Discovery of Probable OT by HST
  10. IPN triangulation of GRB020708
  11. IPN triangulation of GRB020708
  12. Correction to IPN error box for GRB020706
  13. IPN triangulation of GRB020706
  14. GRB 020705: Optical observations
  15. GRB 020625: Optical observations
  16. GRB 020531: optical photometry of Chandra sources
  17. The Probable Host Galaxy of GRB/XRF 020427
  18. GRB/XRF 020427, detection of an underlying system with the VLT
  19. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  20. AXP 1E2259+586 optical observations
  21. Fading Optical Source in the Field of GRB020531
  22. GRB 020531, INT+WFC deep optical upper limits
  23. GRB020405: polarimetric observations
  24. GRB 020531, simultaneous optical observations
  25. GRB020531: Second epoch Chandra observations
  26. GRB020604, optical observations
  27. GRB020604, BVRcIc field photometry
  28. GRB020603, BVRcIc field observations
  29. GRB020531, BVRcIc field photometry
  30. GRB 020531, Radio Observations
  31. IPN triangulation of GRB020604
  32. GRB020531 Optical Observations
  33. GRB020531: Observations with the Chandra X-ray Observatory
  34. GRB020531, optical observations
  35. GRB020531: optical observations
  36. GRB020531(=H2042): Optical Observations
  37. GRB020531(=H2042): Optical Observations
  38. GRB020525, optical observations
  39. IPN triangulation of GRB020525
  40. GRB020405 field photometry at ESO
  41. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  42. XRF 020427
  43. GRB 020124: Optical observations
  44. IPN triangulation of GRB020418
  45. GRB020405: VLT observations of the OT environment
  46. GRB020405: predicted break
  47. GRB 020409: No Evidence for an Optical Afterglow
  48. GRB 020331 Kyoto observation on March 31
  49. GRB 020409
  50. BeppoSAX ALERT: possible GRB020411
  51. X-ray afterglow of GRB020321
  52. GRB020331 optical observations with RIMOTS
  53. GRB020124 optical observations with RIBOTS/RIMOTS
  54. GRB 020321: Candidate X-ray Counterparts
  55. ASM GRB candidate 020406 refined error box
  56. GRB020406(?), optical observations
  57. Short RXTE/ASM transient 020406; may be a GRB
  58. GRB020405, Radio Observations
  59. GRB 020405, U-band observations
  60. IPN localization of GRB020405
  61. GRB020331 NIR observation at KPNO (re-submission)
  62. GRB02033 NIR observation at KPNO
  63. GRB020331 field photometry
  64. GRB 020331, NIR observations
  65. GRB 020322: BeppoSAX observations of the X-ray afterglow
  66. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  67. GRB 020322, Radio observations
  68. Near-Infrared Observations of GRB020322 at TIRGO
  69. GRB 020321, Radio Observations
  70. GRB 020322: Optical Observations
  71. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  72. GRB 020321: Optical observations
  73. GRB020317 BVRI field photometry
  74. GRB011211 revised BVRI field photometry
  75. GRB020305 BVRI field photometry
  76. GRB020322 BVRI field photometry
  77. GRB 020322: Optical Sources and Improved Astrometry
  78. GRB020317: optical observations
  79. GRB020321 optical observations
  80. GRB020321: a faint BeppoSAX detection
  81. GRB 020317 : KISO Optical Observations
  82. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  83. GRB 020305: Optical Observations
  84. GRB020317, optical observations
  85. GRB 020317: Optical observations
  86. GRB020305: Properties of the Candidate Optical Afterglow
  87. GRB 011121: HST Observations reveal an intermediate-time multicolor
  88. GRB011130 (XRF011130) Second Epoch Chandra Observations
  89. XRF/GRB 011030: Detection of the Probable Host Galaxy
  90. GRB020305, optical observations
  91. GRB020305 (=H1939): Localization of a GRB by HETE
  92. HST Imaging of the afterglow and host of GRB 011121
  93. SGR1900+14 activity
  94. IPN Upper Limits to a GRB Associated With SN2002ap
  95. GRB020124 BVRI field photometry
  96. SN2002ap (SN/GRB?) Echelle spectra
  97. SN2002ap (SN/GRB?) optical spectrographic observations
  98. GRB020127 Optical Observations
  99. SN 2002ap (SN/GRB?)
  100. SN2002ap (SN/GRB?) UBVRI Field Photometry

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