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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"

23685 results found.

  1. IPN Summary of SGR1806-20 Activity in 2004
  2. SGR 1806-20: no IR variability of the proposed counterparts
  3. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  4. SGR 1806-20, potential NIR counterpart
  5. MASTER: HETE Alert 3274 optical observation
  6. Activivty of SGR 1806-20
  7. GRB 040511: NIR observations with REM
  8. GRB040511: Candidate optical/NIR afterglow
  9. IBAS GRB Alerts n.1785 to 1791
  10. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  11. IBAS GRB Alerts 1781-4
  12. GRB 040511: Optical observations
  13. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  14. IBAS GRB Alert number 1774: NOT a real GRB
  15. IBAS Alerts 1771 and 1772: NOT a real GRB
  16. GRB040422: optical observations at Xinglong Observatory
  17. GRB 040423 (=H3175): A Long GRB Localized by HETE
  18. GRB040422 : I-band follow-up observation at Lulin Observatory
  19. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  20. GRB 040422,optical observation
  21. GRB 040422: a long GRB detected with INTEGRAL
  22. MASTER: HETE Alert 3163, 3167 technical optical observation
  23. INTEGRAL-SPI/ACS GRB data: timing correction
  24. IBAS GRB alerts 1739, 1740, 1741
  25. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  26. GRB 040403: Optical Observations
  27. GRB 040403: Optical observations
  28. GRB 040403: a long GRB detected with INTEGRAL
  29. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  30. IBAS GRB Alert 1694
  31. GRB040323: NIR Observations and Variable Object
  32. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  33. GRB 040323, a dark GRB ?
  34. GRB 040323: a long GRB detected with INTEGRAL
  35. IBAS GRB alerts 1679, 1680, 1681
  36. IBAS Alert 1678: not a GRB
  37. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  38. GRB 031203, possible supernova
  39. IBAS results on a burst from SGR1806-20
  40. INTEGRAL detection of activity from SGR1806-20
  41. RXTE GRB040229 optical observation: no candidate
  42. GRB 040228 Optical observations
  43. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  44. GRB 040223: further offline analysis
  45. GRB 040223: a long GRB detected with INTEGRAL
  46. GRB031111, optical observations
  47. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  48. Follow-up on IBAS GRB Alert 1379
  49. IBAS GRB alert 1379
  50. SN 2003dh/GRB030329 late-time optical spectroscopy
  51. GRB040106: Second Epoch Optical Observations
  52. GRB040106: optical observations with REM+ROSS
  53. GRB031220: observation at Univercity of Miyazaki
  54. GRB 040106 : peak flux
  55. GRB 040106 : a long GRB detected with INTEGRAL
  56. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  57. IPN triangulation of GRB031219 (large error box)
  58. GRB031220: Palomar Observations
  59. GRB 031220: Optical observation at Tokyo Tech
  60. GRB031220: ROTSE-IIIb Optical Limits
  61. GRB 031203: SMARTS optical monitoring
  62. GRB 031203: Optical/IR Astrometry
  63. IPN/HETE localization of GRB031203B (=H2949; large error box)
  64. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  65. XMM-Newton Observation of GRB031203
  66. XMM-Newton Observation of GRB031203
  67. GRB 031203: Radio detection
  68. GRB031203 : Optical Observation of Lulin Observatory
  69. GRB 031203: Apparent Spectral Break
  70. GRB031203: Planned XMM-Newton observation II
  71. GRB 031203: Optical/IR SMARTS Observations
  72. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  73. GRB 031203: further analysis of INTEGRAL data
  74. GRB 031203: A long GRB detected with INTEGRAL
  75. IPN triangulation of GRB031201 (large error box)
  76. IPN triangulation of GRB031130 (large error box)
  77. GRB031111A, prompt optical observations
  78. IPN triangulation of GRB031120 (two large error boxes)
  79. IPN/HETE localization of GRB031109 (=H2917; large error box)
  80. IPN triangulation of GRB031107 (two large error boxes)
  81. GRB 031111, optical observations
  82. HETE Prompt GRB Spectral Analyses
  83. XRF031109 (=H2919): A very long XRF localized by HETE
  84. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  85. GRB030929/SN2003jd association unlikely based on IPN localiztion
  86. Lulin optical follow-up observations of GRB031026
  87. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  88. GRB 031026: Further Ic Observations
  89. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  90. IPN triangulation of GRB031024 (single error box)
  91. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  92. GRB 031026: Ic Observations
  93. IPN triangulation of GRB031024 (annulus)
  94. IBAS alert 1180 refers to a burst from SGR 1806-20
  95. HETE Prompt GRB Light Curves and Color-Color Diagrams
  96. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  97. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  98. IPN detection of continued activity from SGR1806-20
  99. IPN triangulation of GRB031007 (two large error boxes)
  100. A burst from SGR 1806-20 detected with IBAS

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