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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"

5386 results found.

  1. GRB021104: possible optical afterglow
  2. GRB021016, optical observations
  3. GRB021004: Optical Observations
  4. GRB021004: BVRc photometry
  5. GRB021004 radio observation
  6. GRB 021004: Optical Decay
  7. GRB 021004: Optical Observations
  8. GRB 021004: Optical Observations
  9. GRB 021004, optical observations
  10. GRB 021004 radio search
  11. INTEGRAL GRBs added to GCN
  12. GRB 020812: early time optical observation at Ouda Station
  13. Early Time Limits for GRB020813
  14. GRB 020813 Afterglow Observations; Possible break
  15. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  16. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  17. IPN triangulation of GRB020714
  18. IPN triangulation of GRB020714
  19. GRB 020625, optical observations
  20. AXP 1E2259+586 optical observations
  21. IPN detection of possible bursts from SGR1806-20
  22. GRB 020409: No Evidence for an Optical Afterglow
  23. GRB020331 optical observations with RIMOTS
  24. Short RXTE/ASM transient 020406; may be a GRB
  25. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  26. GRB011212: Optical Observations
  27. Bepposax GRB020322 The second springtime BSAX GRB
  28. GRB 020317 : KISO Optical Observations
  29. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  30. GRB020127 Optical Observations
  31. GRB011212: Optical observations at Gunma
  32. GRB 011211, Optical Observations
  33. GRB 011130: Optical Observations of Chandra Sources
  34. GRB 011130 I-band Observation
  35. GRB011130 (XRF011130) SDSS PT i-band observations
  36. XRF011130: Infrared Observations
  37. GRB011130, Radio Observations
  38. GRB010921, optical observation
  39. GRB010921 Optical Observations
  40. SGR1900+14 burst seen by HETE: BeppoSAX data
  41. GRB 010629 Optical Observations
  42. SGR1900+14: High Fluence Burst Localized by HETE
  43. GRB010326: Localization by HETE
  44. Sub-millimeter Excess/GRB 010222
  45. GRB010222: Sub-millimeter detection
  46. GRB010214 Optical Observation
  47. CORRECTION to XMM-Newton observation of GRB001025
  48. XMM-Newton observation of GRB001025
  49. CORRECTION TO IPN/RXTE ERROR BOX FOR GRB001025
  50. ASM Localization of GRB 001025
  51. GRB 001007, BVR-band observations
  52. GRB000926 - Amateur Optical Observations
  53. GRB000926 optical observations
  54. GRB 000615, near-infrared observations
  55. IPN triangulation of GRB000516
  56. GRB 000418, Optical Observation
  57. GRB000418, near-infrared observations
  58. GRB000301C: RXTE/ASM and IPN localizations
  59. SAX_WFC_GRB_NOTICE
  60. GRB 000201: TAROT optical observations
  61. IPN annulus for GRB000115
  62. Second RXTE Observation of GRB 000115
  63. GRB991216, UBVRIJHK field photometry
  64. GCN resumes full operations
  65. IPN error box for GRB991216
  66. GRB991216, optical observations
  67. IPN localization of GRB991105
  68. GRB 990806, Optical Observations
  69. GRB990704 radio and optical observations
  70. GRB 990704, optical observations
  71. Identification of a possible optical counterpart for GRB990704
  72. IPN error box for GRB990527
  73. GRB 990506 optical observations
  74. IPN localization for GRB990506
  75. GRB990321 REFINED IPN ANNULUS
  76. GRB990321 IPN TRIANGULATION
  77. ASM/IPN error box for GRB 990308 (BATSE #7457)
  78. GRB990123, Upcoming HST Service Observations
  79. GRB990123, optical observation
  80. GRB 981220 Optical observations
  81. GRB 981220:Optical Observations
  82. GRB981226 Optical Observation
  83. BeppoSAX NFI Observation of GRB980425
  84. GRB980326 X-ray Observations
  85. GRB980329 Keck K-band observations
  86. GRB980329 infrared observations

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