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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"

28124 results found.

  1. GRB040924 (H3564): Optical afterglow candidate
  2. XRF 040912: Radio Observations
  3. XRF 040916: Radio Observations
  4. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  5. TAROT Observations of GRB 040916 (HETE #3558)
  6. GRB040912(=H3557): Candidate Optical Afterglow
  7. XRF040912, BVRcIc field calibration
  8. XRF040916, BVRcIc field calibration
  9. GRB040916: Archival optical observations
  10. GRB 040912: Optical Observations
  11. GRB 040912, BVRI observations
  12. HETE 3557: Optical observations
  13. GRB040827: analysis of the XMM-Newton observation
  14. GRB040903, REM near-IR observation
  15. GRB 040827 - Radio Observations
  16. XMM-Newton Images of GRB 040827
  17. GRB040825A: Optical observations
  18. GRB040825A: Optical observations
  19. GRB 040827: optical and NIR observations at the VLT
  20. GRB 040827: UKIRT - 2nd epoch K-band imaging
  21. GRB 040827: 2nd epoch of Magellan K-band imaging
  22. GRB 040827: Detection of NIR afterglow
  23. GRB 040827: Possible detection of optical afterglow
  24. GRB040825B, BVRcIc field photometry
  25. GRB040825A, BVRcIc field photometry
  26. GRB 040825: Optical observations
  27. XRF040812: possible afterglow second Chandra observation
  28. GRB 040812: Second epoch CXO Observations
  29. XRF040812: possible afterglow
  30. CXO observation of GRB 040812
  31. GRB 040812: radio observations
  32. GRB 040810: Optical observations of a limited region
  33. GRB040624: optical monitoring at TNG
  34. XRF040701: Second-Epoch Chandra Observations
  35. XRF040701: VLA Observations
  36. XRF040701: First-Epoch Chandra Observations
  37. GRB 030329: Rebrightening of hyperluminal ejecta.
  38. GRB040511: Retraction of redshift identification
  39. GRB 040511, very fast decay?
  40. GRB 030324: Detection and Color of Host Galaxy
  41. GRB040511: Redshift identifcation
  42. GRB 040511: Optical limit
  43. GRB040511: Candidate optical/NIR afterglow
  44. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  45. GRB040422, BVRcIc field calibration
  46. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  47. GRB 040403: Optical Observations
  48. GRB 040323, a dark GRB ?
  49. GRB040223: Deep NIR NTT data re-analysis
  50. GRB 040223: XMM-Newton results
  51. GRB040223, improved XMM position
  52. GRB 031203, possible supernova
  53. MASTER: RXTE GRB040308 optical observation
  54. INTEGRAL detection of activity from SGR1806-20
  55. RXTE GRB040229 optical observation: no candidate
  56. GRB 040228 Optical observations
  57. GRB 040223 : Optical observation (non-detection)
  58. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  59. GRB031203: Chandra Observations
  60. GRB040106: refined X-ray transient position
  61. GRB040106, likely optical afterglow
  62. GRB040106: Second Epoch Optical Observations
  63. GRB 031220: Optical observations of Chandra X-ray sources
  64. GRB031220: Palomar Observations
  65. GRB031203, improved XMM position
  66. GRB 031203: Discovery of a dust echo
  67. GRB 021203: A Normal GRB viewed far off axis?
  68. GRB 031203: Variable Radio Source
  69. GRB 031203: Optical/IR Astrometry
  70. GRB031203: K' Photometry of the likely GRB host
  71. GRB 031203: Radio detection
  72. GRB 031203: IR NTTobservations do not confirm REM detection
  73. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  74. IPN detection of activity from SGR1806-20
  75. GRB 031111: Optical observations
  76. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  77. GRB030329: radio observations at RT-22 (CrAO)
  78. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  79. IPN detection of continued activity from SGR1806-20
  80. XRF 030723: Subaru Optical Observations
  81. XRF 030723: Detection of the likely host galaxy
  82. GRB030913: Subaru Optical Observations
  83. GRB030913, candidate afterglow observations
  84. GRB 030913, optical candidate
  85. GRB030913: AAVSO optical observations
  86. GRB030913 (=H2849): Confirmation of the Flight Localization
  87. Magellan Observations of GRB030725 (=H2779)
  88. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  89. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  90. IBAS detection of bursts from SGR 1806-20
  91. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  92. IPN detection of continued activity from SGR1806-20
  93. GRB 021206 Optical Observations
  94. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  95. XRF 030723: Detection of a rebrightening in the optical afterglow
  96. GRB030725: Optical observations
  97. XRF030723, BVRcIc field photometry update
  98. XRF030723: Re-analysis of ROTSE-III early images
  99. GRB 030725: optical observations.
  100. GRB030725, optical transient observations

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