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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"

27401 results found.

  1. GRB 2974 follow-up observations
  2. GRB031203, improved XMM position
  3. GRB 021203: A Normal GRB viewed far off axis?
  4. XMM-Newton Observations of GRB031203: Preliminary Images
  5. GRB 031203: Variable Radio Source
  6. GRB 031203: Magellan spectrum of possible GRB host
  7. GRB 031203: Optical/IR Astrometry
  8. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  9. XMM-Newton Observation of GRB031203
  10. GRB031203: K' Photometry of the likely GRB host
  11. XMM-Newton Observation of GRB031203
  12. GRB 031203: IR NTTobservations do not confirm REM detection
  13. GRB031203 : Optical Observation of Lulin Observatory
  14. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  15. GRB 031203: Apparent Spectral Break
  16. GRB031203: Planned XMM-Newton observation II
  17. GRB 031203: IR REM Observations
  18. GRB031203: Optical Observations
  19. GRB 031203 XMM-Newton observation
  20. GRB031203: Planned XMM-Newton observation
  21. GRB 031203: further analysis of INTEGRAL data
  22. GRB 030329: Planned XMM-Newton Observation
  23. GRB 031111B (= H2925) : Kyoto Optical Observation
  24. IPN triangulation of GRB031114 (large error box)
  25. GRB 031111, optical observations
  26. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  27. GRB030929/SN2003jd association unlikely based on IPN localiztion
  28. IPN triangulation of GRB031027 (small error box)
  29. Lulin optical follow-up observations of GRB031026
  30. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  31. IPN triangulation of GRB031024 (single error box)
  32. IPN triangulation of GRB031024 (annulus)
  33. IPN triangulation of GRB031020 (large error box)
  34. XRF 030824: additional observations at CFHT
  35. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  36. XRF 030723: Subaru Optical Observations
  37. XRF 030824: Early follow-up observation at Kiso observatory
  38. XRF 030824: observations at CFHT
  39. IPN triangulation of GRB030922B (large error box)
  40. XRF 030723: Detection of the likely host galaxy
  41. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  42. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  43. IPN triangulation of GRB030921 (large error box)
  44. IPN triangulation of GRB030919 (large error box)
  45. GRB030913: Subaru Optical Observations
  46. GRB 030913, optical candidate
  47. GRB 030913, BOOTES observations
  48. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  49. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  50. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  51. XRF030824: Optical observations
  52. IPN triangulation of GRB030903 (large error box)
  53. IPN triangulation of GRB030827 (large error box)
  54. GRB030823: optical observations
  55. GRB030823: optical observation at Tokyo Tech
  56. Lulin follow-up observations of GRB030823
  57. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  58. IPN detection of continued activity from SGR1806-20
  59. GRB 030817 = H2808 TAROT optical observations
  60. SGR 1808-20 (=H2802): A Possible new SGR
  61. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  62. XRF 030723: Detection of a rebrightening in the optical afterglow
  63. XRF030723, BVRcIc field photometry update
  64. IPN triangulation of GRB030801 (large error box)
  65. GRB021206 optical counterpart upper limit
  66. IPN triangulation of GRB030726 (large error box)
  67. IPN triangulation of GRB030721 (large error box)
  68. XRF030723 Radio Observations
  69. XRF 030723: confirmation of fading optical counterpart
  70. XRF030723(=H2777): Chandra Observations
  71. GRB030723: Upper limits from historical observations
  72. XRF030723: Palomar observations and proposed counterpart
  73. GRB030725 (=H2779): A Bright GRB Localized by HETE
  74. XRF030723 (= H2777): Chandra Observations Scheduled
  75. XRF030723, BVRcIc field photometry correction
  76. XRF030723, ROTSE-III Early Observations
  77. XRF030723, BVRcIc field photometry
  78. XRF 030723, optical observations
  79. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  80. Konus-Wind detection of the bursts from SGR1806-20 region
  81. SGR 1806-20, submm observations
  82. RXTE PCA Observations of SGR1806-20 Region
  83. IPN triangulation of GRB030714 (two large error boxes)
  84. IPN triangulation of GRB030715 (two large error boxes)
  85. GRB030706 triangulation (single large error box)
  86. GRB030329, optical observation in May
  87. IPN triangulation of GRB030626 (single large error box)
  88. IPN triangulation of GRB030626 (two large error boxes)
  89. GRB030329: second XMM-Newton observation
  90. GRB030329 -- RATAN-600 data in April-May
  91. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  92. IPN triangulation of GRB030606 (two alternate error boxes)
  93. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  94. GRB 030528: tentative NIR counterpart
  95. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  96. GRB030528, BVRI field photometry
  97. GRB030329, SPM optical observations
  98. GRB030528: Chandra TOO Planned
  99. GRB030528(=H2724): Revised SXC Localization
  100. GRB 030528 Bisei optical observation

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