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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"

32536 results found.

  1. GRB 040511, very fast decay?
  2. GRB 030324: Detection and Color of Host Galaxy
  3. GRB 040511: NIR observations with REM
  4. GRB040511: Redshift identifcation
  5. GRB 040511: Optical limit
  6. GRB040511: Candidate optical/NIR afterglow
  7. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  8. GRB 040511: Second Epoch Optical Observations
  9. GRB 040511: Optical observations
  10. GRB 040511: Optical Observations
  11. GRB040511: Optical Observations
  12. GRB040511: Optical Observations
  13. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  14. IPN triangulation of GRB040425 (=H3183)
  15. On Line Availability of Archival HETE Fregate Data and Lightcurves
  16. GRB040422, optical observations at Loiano
  17. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  18. GRB040422, BVRcIc field calibration
  19. GRB040422: optical and NIR observations at the VLT
  20. GRB 040403, deep optical observations
  21. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  22. GRB 040403: Optical Observations
  23. GRB 040403 Optical Observations
  24. GRB 040403: Optical observations
  25. GRB 040403: optical observations
  26. GRB 040403: Optical Observations
  27. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  28. GRB040323: NIR Observations and Variable Object
  29. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  30. GRB 040323, a dark GRB ?
  31. GRB040223: Deep NIR NTT data re-analysis
  32. GRB 040223: XMM-Newton results
  33. GRB040223, improved XMM position
  34. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  35. GRB 031203, possible supernova
  36. IBAS results on a burst from SGR1806-20
  37. GRB 040228 Optical observations
  38. IPN triangulation of GRB040228 (H3066, H3067)
  39. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  40. GRB 040223: Deep NIR NTT observations
  41. GRB 040223 : Optical observation (non-detection)
  42. XMM-Newton Images of GRB 040223
  43. GRB 040223, VLA observations
  44. GRB 040223: REM IJK Observations
  45. GRB 040223 XMM-Newton observation ...
  46. GRB 031203 XMM-Newton observation
  47. GRB031111, optical observations
  48. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  49. GRB031203: Chandra Observations
  50. GRB040106, follow-up radio observations
  51. GRB040106: refined X-ray transient position
  52. Follow-up on IBAS GRB Alert 1379
  53. SN 2003dh/GRB030329 late-time optical spectroscopy
  54. GRB040106, Radio Observations
  55. GRB040106, likely optical afterglow
  56. GRB040106: Second Epoch Optical Observations
  57. GRB 031220: Optical observations of Chandra X-ray sources
  58. XMM-Newton Images of GRB 040106
  59. GRB040106: optical observations with REM+ROSS
  60. GRB031220: observation at Univercity of Miyazaki
  61. GRB 040106: Optical observations
  62. XMM-Newton observation of GRB040106
  63. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  64. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  65. GRB 031203 I-band monitoring
  66. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  67. GRB 2974 follow-up observations
  68. GRB031203, improved XMM position
  69. GRB 031203: SMARTS optical monitoring
  70. GRB 021203: A Normal GRB viewed far off axis?
  71. GRB 031203: Variable Radio Source
  72. GRB 031203: Magellan spectrum of possible GRB host
  73. GRB 031203: Optical/IR Astrometry
  74. GRB031203 K prime photometry: correction to galaxy coordinates
  75. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  76. XMM-Newton Observation of GRB031203
  77. GRB031203: K' Photometry of the likely GRB host
  78. XMM-Newton Observation of GRB031203
  79. GRB 031203: Radio detection
  80. GRB 031203: Further reports on December 4 observations
  81. GRB 031203: IR NTTobservations do not confirm REM detection
  82. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  83. GRB 031203: Apparent Spectral Break
  84. GRB031203: Planned XMM-Newton observation II
  85. GRB 031203: IR REM Observations
  86. GRB031203: Optical Observations
  87. GRB 031203 XMM-Newton observation
  88. GRB 031203: Optical/IR SMARTS Observations
  89. GRB031203: Planned XMM-Newton observation
  90. GRB031111A, prompt optical observations
  91. GRB 031111, Radio observations
  92. GRB 031111: Optical observations
  93. GRB 031111, optical observations
  94. SN 2003jd (SN/GRB?) -- X-ray Observations
  95. IPN triangulation of GRB031111 (=H2924): small error box
  96. XRF031109 (=H2919): A very long XRF localized by HETE
  97. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  98. GRB030929/SN2003jd association unlikely based on IPN localiztion
  99. Lulin optical follow-up observations of GRB031026
  100. SN 2003jd (SN/GRB?), Radio Observations

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