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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"

27399 results found.

  1. GRB 021203: A Normal GRB viewed far off axis?
  2. XMM-Newton Observations of GRB031203: Preliminary Images
  3. GRB 031203: Variable Radio Source
  4. GRB 031203: Magellan spectrum of possible GRB host
  5. GRB 031203: Optical/IR Astrometry
  6. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  7. XMM-Newton Observation of GRB031203
  8. GRB031203: K' Photometry of the likely GRB host
  9. XMM-Newton Observation of GRB031203
  10. GRB 031203: IR NTTobservations do not confirm REM detection
  11. GRB031203 : Optical Observation of Lulin Observatory
  12. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  13. GRB 031203: Apparent Spectral Break
  14. GRB031203: Planned XMM-Newton observation II
  15. GRB 031203: IR REM Observations
  16. GRB031203: Optical Observations
  17. GRB 031203 XMM-Newton observation
  18. GRB031203: Planned XMM-Newton observation
  19. GRB 031203: further analysis of INTEGRAL data
  20. GRB 030329: Planned XMM-Newton Observation
  21. GRB 031111B (= H2925) : Kyoto Optical Observation
  22. IPN triangulation of GRB031114 (large error box)
  23. GRB 031111, optical observations
  24. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  25. GRB030929/SN2003jd association unlikely based on IPN localiztion
  26. IPN triangulation of GRB031027 (small error box)
  27. Lulin optical follow-up observations of GRB031026
  28. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  29. IPN triangulation of GRB031024 (single error box)
  30. IPN triangulation of GRB031024 (annulus)
  31. IPN triangulation of GRB031020 (large error box)
  32. XRF 030824: additional observations at CFHT
  33. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  34. XRF 030723: Subaru Optical Observations
  35. XRF 030824: Early follow-up observation at Kiso observatory
  36. XRF 030824: observations at CFHT
  37. IPN triangulation of GRB030922B (large error box)
  38. XRF 030723: Detection of the likely host galaxy
  39. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  40. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  41. IPN triangulation of GRB030921 (large error box)
  42. IPN triangulation of GRB030919 (large error box)
  43. GRB030913: Subaru Optical Observations
  44. GRB 030913, optical candidate
  45. GRB 030913, BOOTES observations
  46. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  47. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  48. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  49. XRF030824: Optical observations
  50. IPN triangulation of GRB030903 (large error box)
  51. IPN triangulation of GRB030827 (large error box)
  52. GRB030823: optical observations
  53. GRB030823: optical observation at Tokyo Tech
  54. Lulin follow-up observations of GRB030823
  55. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  56. IPN detection of continued activity from SGR1806-20
  57. GRB 030817 = H2808 TAROT optical observations
  58. SGR 1808-20 (=H2802): A Possible new SGR
  59. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  60. XRF 030723: Detection of a rebrightening in the optical afterglow
  61. XRF030723, BVRcIc field photometry update
  62. IPN triangulation of GRB030801 (large error box)
  63. GRB021206 optical counterpart upper limit
  64. IPN triangulation of GRB030726 (large error box)
  65. IPN triangulation of GRB030721 (large error box)
  66. XRF030723 Radio Observations
  67. XRF 030723: confirmation of fading optical counterpart
  68. XRF030723(=H2777): Chandra Observations
  69. GRB030723: Upper limits from historical observations
  70. XRF030723: Palomar observations and proposed counterpart
  71. GRB030725 (=H2779): A Bright GRB Localized by HETE
  72. XRF030723 (= H2777): Chandra Observations Scheduled
  73. XRF030723, BVRcIc field photometry correction
  74. XRF030723, ROTSE-III Early Observations
  75. XRF030723, BVRcIc field photometry
  76. XRF 030723, optical observations
  77. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  78. Konus-Wind detection of the bursts from SGR1806-20 region
  79. SGR 1806-20, submm observations
  80. RXTE PCA Observations of SGR1806-20 Region
  81. IPN triangulation of GRB030714 (two large error boxes)
  82. IPN triangulation of GRB030715 (two large error boxes)
  83. GRB030706 triangulation (single large error box)
  84. GRB030329, optical observation in May
  85. IPN triangulation of GRB030626 (single large error box)
  86. IPN triangulation of GRB030626 (two large error boxes)
  87. GRB030329: second XMM-Newton observation
  88. GRB030329 -- RATAN-600 data in April-May
  89. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  90. IPN triangulation of GRB030606 (two alternate error boxes)
  91. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  92. GRB 030528: tentative NIR counterpart
  93. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  94. GRB030528, BVRI field photometry
  95. GRB030329, SPM optical observations
  96. GRB030528: Chandra TOO Planned
  97. GRB030528(=H2724): Revised SXC Localization
  98. GRB 030528 Bisei optical observation
  99. GRB030528 (H2724): A long GRB localized by HETE
  100. GRB 030329: Correction to GCN 2254

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