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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

32714 results found.

  1. GRB 040403 Optical Observations
  2. GRB 040403: Optical observations
  3. GRB 040403: optical observations
  4. GRB 040403: Optical Observations
  5. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  6. GRB040323: NIR Observations and Variable Object
  7. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  8. GRB 040323, a dark GRB ?
  9. GRB040223: Deep NIR NTT data re-analysis
  10. GRB 040223: XMM-Newton results
  11. GRB040223, improved XMM position
  12. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  13. GRB 031203, possible supernova
  14. IBAS results on a burst from SGR1806-20
  15. GRB 040228 Optical observations
  16. IPN triangulation of GRB040228 (H3066, H3067)
  17. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  18. GRB 040223: Deep NIR NTT observations
  19. GRB 040223 : Optical observation (non-detection)
  20. XMM-Newton Images of GRB 040223
  21. GRB 040223, VLA observations
  22. GRB 040223: REM IJK Observations
  23. GRB 040223 XMM-Newton observation ...
  24. GRB 031203 XMM-Newton observation
  25. GRB031111, optical observations
  26. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  27. GRB031203: Chandra Observations
  28. GRB040106, follow-up radio observations
  29. GRB040106: refined X-ray transient position
  30. Follow-up on IBAS GRB Alert 1379
  31. SN 2003dh/GRB030329 late-time optical spectroscopy
  32. GRB040106, Radio Observations
  33. GRB040106, likely optical afterglow
  34. GRB040106: Second Epoch Optical Observations
  35. GRB 031220: Optical observations of Chandra X-ray sources
  36. XMM-Newton Images of GRB 040106
  37. GRB040106: optical observations with REM+ROSS
  38. GRB031220: observation at Univercity of Miyazaki
  39. GRB 040106: Optical observations
  40. XMM-Newton observation of GRB040106
  41. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  42. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  43. GRB 031203 I-band monitoring
  44. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  45. GRB 2974 follow-up observations
  46. GRB031203, improved XMM position
  47. GRB 031203: SMARTS optical monitoring
  48. GRB 021203: A Normal GRB viewed far off axis?
  49. GRB 031203: Variable Radio Source
  50. GRB 031203: Magellan spectrum of possible GRB host
  51. GRB 031203: Optical/IR Astrometry
  52. GRB031203 K prime photometry: correction to galaxy coordinates
  53. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  54. XMM-Newton Observation of GRB031203
  55. GRB031203: K' Photometry of the likely GRB host
  56. XMM-Newton Observation of GRB031203
  57. GRB 031203: Radio detection
  58. GRB 031203: Further reports on December 4 observations
  59. GRB 031203: IR NTTobservations do not confirm REM detection
  60. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  61. GRB 031203: Apparent Spectral Break
  62. GRB031203: Planned XMM-Newton observation II
  63. GRB 031203: IR REM Observations
  64. GRB031203: Optical Observations
  65. GRB 031203 XMM-Newton observation
  66. GRB 031203: Optical/IR SMARTS Observations
  67. GRB031203: Planned XMM-Newton observation
  68. GRB031111A, prompt optical observations
  69. GRB 031111, Radio observations
  70. GRB 031111: Optical observations
  71. GRB 031111, optical observations
  72. SN 2003jd (SN/GRB?) -- X-ray Observations
  73. IPN triangulation of GRB031111 (=H2924): small error box
  74. XRF031109 (=H2919): A very long XRF localized by HETE
  75. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  76. GRB030929/SN2003jd association unlikely based on IPN localiztion
  77. Lulin optical follow-up observations of GRB031026
  78. SN 2003jd (SN/GRB?), Radio Observations
  79. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  80. GRB 031026: Further Ic Observations
  81. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  82. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  83. IPN triangulation of GRB031024 (single error box)
  84. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  85. XRF 030824: additional observations at CFHT
  86. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  87. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  88. XRF 030723: Subaru Optical Observations
  89. XRF 030824: Early follow-up observation at Kiso observatory
  90. XRF 030723: Detection of the likely host galaxy
  91. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  92. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  93. IPN triangulation of GRB030922A (large error box)
  94. IPN triangulation of GRB030921 (large error box)
  95. GRB030913: Subaru Optical Observations
  96. GRB 030913: ROTSE-3c Optical Observations
  97. GRB030913: OT's limit by MASTER
  98. GRB030913, candidate afterglow observations
  99. GRB030913: AAVSO optical observations
  100. GRB030913 (=H2849): Confirmation of the Flight Localization

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