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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"

32532 results found.

  1. GRB 040511: Optical limit
  2. GRB040511: Candidate optical/NIR afterglow
  3. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  4. GRB 040511: Second Epoch Optical Observations
  5. GRB 040511: Optical observations
  6. GRB 040511: Optical Observations
  7. GRB040511: Optical Observations
  8. GRB040511: Optical Observations
  9. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  10. IPN triangulation of GRB040425 (=H3183)
  11. On Line Availability of Archival HETE Fregate Data and Lightcurves
  12. GRB040422, optical observations at Loiano
  13. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  14. GRB040422, BVRcIc field calibration
  15. GRB040422: optical and NIR observations at the VLT
  16. GRB 040403, deep optical observations
  17. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  18. GRB 040403: Optical Observations
  19. GRB 040403 Optical Observations
  20. GRB 040403: Optical observations
  21. GRB 040403: optical observations
  22. GRB 040403: Optical Observations
  23. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  24. GRB040323: NIR Observations and Variable Object
  25. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  26. GRB 040323, a dark GRB ?
  27. GRB040223: Deep NIR NTT data re-analysis
  28. GRB 040223: XMM-Newton results
  29. GRB040223, improved XMM position
  30. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  31. GRB 031203, possible supernova
  32. IBAS results on a burst from SGR1806-20
  33. GRB 040228 Optical observations
  34. IPN triangulation of GRB040228 (H3066, H3067)
  35. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  36. GRB 040223: Deep NIR NTT observations
  37. GRB 040223 : Optical observation (non-detection)
  38. XMM-Newton Images of GRB 040223
  39. GRB 040223, VLA observations
  40. GRB 040223: REM IJK Observations
  41. GRB 040223 XMM-Newton observation ...
  42. GRB 031203 XMM-Newton observation
  43. GRB031111, optical observations
  44. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  45. GRB031203: Chandra Observations
  46. GRB040106, follow-up radio observations
  47. GRB040106: refined X-ray transient position
  48. Follow-up on IBAS GRB Alert 1379
  49. SN 2003dh/GRB030329 late-time optical spectroscopy
  50. GRB040106, Radio Observations
  51. GRB040106, likely optical afterglow
  52. GRB040106: Second Epoch Optical Observations
  53. GRB 031220: Optical observations of Chandra X-ray sources
  54. XMM-Newton Images of GRB 040106
  55. GRB040106: optical observations with REM+ROSS
  56. GRB031220: observation at Univercity of Miyazaki
  57. GRB 040106: Optical observations
  58. XMM-Newton observation of GRB040106
  59. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  60. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  61. GRB 031203 I-band monitoring
  62. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  63. GRB 2974 follow-up observations
  64. GRB031203, improved XMM position
  65. GRB 031203: SMARTS optical monitoring
  66. GRB 021203: A Normal GRB viewed far off axis?
  67. GRB 031203: Variable Radio Source
  68. GRB 031203: Magellan spectrum of possible GRB host
  69. GRB 031203: Optical/IR Astrometry
  70. GRB031203 K prime photometry: correction to galaxy coordinates
  71. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  72. XMM-Newton Observation of GRB031203
  73. GRB031203: K' Photometry of the likely GRB host
  74. XMM-Newton Observation of GRB031203
  75. GRB 031203: Radio detection
  76. GRB 031203: Further reports on December 4 observations
  77. GRB 031203: IR NTTobservations do not confirm REM detection
  78. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  79. GRB 031203: Apparent Spectral Break
  80. GRB031203: Planned XMM-Newton observation II
  81. GRB 031203: IR REM Observations
  82. GRB031203: Optical Observations
  83. GRB 031203 XMM-Newton observation
  84. GRB 031203: Optical/IR SMARTS Observations
  85. GRB031203: Planned XMM-Newton observation
  86. GRB031111A, prompt optical observations
  87. GRB 031111, Radio observations
  88. GRB 031111: Optical observations
  89. GRB 031111, optical observations
  90. SN 2003jd (SN/GRB?) -- X-ray Observations
  91. IPN triangulation of GRB031111 (=H2924): small error box
  92. XRF031109 (=H2919): A very long XRF localized by HETE
  93. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  94. GRB030929/SN2003jd association unlikely based on IPN localiztion
  95. Lulin optical follow-up observations of GRB031026
  96. SN 2003jd (SN/GRB?), Radio Observations
  97. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  98. GRB 031026: Further Ic Observations
  99. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  100. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum

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