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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"

32711 results found.

  1. GRB 040403: Optical Observations
  2. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  3. GRB040323: NIR Observations and Variable Object
  4. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  5. GRB 040323, a dark GRB ?
  6. GRB040223: Deep NIR NTT data re-analysis
  7. GRB 040223: XMM-Newton results
  8. GRB040223, improved XMM position
  9. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  10. GRB 031203, possible supernova
  11. IBAS results on a burst from SGR1806-20
  12. GRB 040228 Optical observations
  13. IPN triangulation of GRB040228 (H3066, H3067)
  14. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  15. GRB 040223: Deep NIR NTT observations
  16. GRB 040223 : Optical observation (non-detection)
  17. XMM-Newton Images of GRB 040223
  18. GRB 040223, VLA observations
  19. GRB 040223: REM IJK Observations
  20. GRB 040223 XMM-Newton observation ...
  21. GRB 031203 XMM-Newton observation
  22. GRB031111, optical observations
  23. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  24. GRB031203: Chandra Observations
  25. GRB040106, follow-up radio observations
  26. GRB040106: refined X-ray transient position
  27. Follow-up on IBAS GRB Alert 1379
  28. SN 2003dh/GRB030329 late-time optical spectroscopy
  29. GRB040106, Radio Observations
  30. GRB040106, likely optical afterglow
  31. GRB040106: Second Epoch Optical Observations
  32. GRB 031220: Optical observations of Chandra X-ray sources
  33. XMM-Newton Images of GRB 040106
  34. GRB040106: optical observations with REM+ROSS
  35. GRB031220: observation at Univercity of Miyazaki
  36. GRB 040106: Optical observations
  37. XMM-Newton observation of GRB040106
  38. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  39. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  40. GRB 031203 I-band monitoring
  41. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  42. GRB 2974 follow-up observations
  43. GRB031203, improved XMM position
  44. GRB 031203: SMARTS optical monitoring
  45. GRB 021203: A Normal GRB viewed far off axis?
  46. GRB 031203: Variable Radio Source
  47. GRB 031203: Magellan spectrum of possible GRB host
  48. GRB 031203: Optical/IR Astrometry
  49. GRB031203 K prime photometry: correction to galaxy coordinates
  50. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  51. XMM-Newton Observation of GRB031203
  52. GRB031203: K' Photometry of the likely GRB host
  53. XMM-Newton Observation of GRB031203
  54. GRB 031203: Radio detection
  55. GRB 031203: Further reports on December 4 observations
  56. GRB 031203: IR NTTobservations do not confirm REM detection
  57. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  58. GRB 031203: Apparent Spectral Break
  59. GRB031203: Planned XMM-Newton observation II
  60. GRB 031203: IR REM Observations
  61. GRB031203: Optical Observations
  62. GRB 031203 XMM-Newton observation
  63. GRB 031203: Optical/IR SMARTS Observations
  64. GRB031203: Planned XMM-Newton observation
  65. GRB031111A, prompt optical observations
  66. GRB 031111, Radio observations
  67. GRB 031111: Optical observations
  68. GRB 031111, optical observations
  69. SN 2003jd (SN/GRB?) -- X-ray Observations
  70. IPN triangulation of GRB031111 (=H2924): small error box
  71. XRF031109 (=H2919): A very long XRF localized by HETE
  72. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  73. GRB030929/SN2003jd association unlikely based on IPN localiztion
  74. Lulin optical follow-up observations of GRB031026
  75. SN 2003jd (SN/GRB?), Radio Observations
  76. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  77. GRB 031026: Further Ic Observations
  78. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  79. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  80. IPN triangulation of GRB031024 (single error box)
  81. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  82. XRF 030824: additional observations at CFHT
  83. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  84. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  85. XRF 030723: Subaru Optical Observations
  86. XRF 030824: Early follow-up observation at Kiso observatory
  87. XRF 030723: Detection of the likely host galaxy
  88. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  89. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  90. IPN triangulation of GRB030922A (large error box)
  91. IPN triangulation of GRB030921 (large error box)
  92. GRB030913: Subaru Optical Observations
  93. GRB 030913: ROTSE-3c Optical Observations
  94. GRB030913: OT's limit by MASTER
  95. GRB030913, candidate afterglow observations
  96. GRB030913: AAVSO optical observations
  97. GRB030913 (=H2849): Confirmation of the Flight Localization
  98. GRB030913 (=H2849): TAROT Observations
  99. Magellan Observations of GRB030725 (=H2779)
  100. GRB030913 (=H2849): A GRB Possibly Localized by HETE

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