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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"

20978 results found.

  1. MASTER: optical observation GRB030601
  2. GRB 030329: optical observations
  3. GRB 030329/SN 2003dh: Jitter Episode
  4. GRB 030329: Optical Observations
  5. GRB 030528: Optical observations at RIKEN
  6. GRB 030416: Optical Observations
  7. GRB030329, Optical observations
  8. GRB 030329/SN 2003dh: Possible increase in brightness
  9. GRB 030329: HST ACS Observations of the Host
  10. GRB 030329 Optical Observations
  11. GRB030329: XMM-Newton observation
  12. GRB 021004: HST observations
  13. GRB030324: Further Observations of the Candidate Optical Afterglow
  14. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  15. GRB 030418: Second Epoch Optical Observations with Magellan
  16. HETE GRB030329, correction to Rc Observations in Loiano
  17. GRB030329: RTT150 optical observations
  18. GRB030329, BVRI photometry
  19. GRB 030329: High-Resolution Spectroscopy of the Host
  20. GRB030429: RTT150 optical observations, a possible host galaxy
  21. GRB030329: RTT150 optical observations and upper limit for a host
  22. GRB030501, optical observation
  23. GRB030329: RTT150 optical observations and upper limit for a host
  24. GRB 030429: Radio Observations
  25. GRB 030429: IR photometry with IRSF/SIRIUS
  26. GRB 030329 Optical Observations
  27. GRB030429: Optical Observations
  28. GRB 030501: TAROT possible candidate counterpart
  29. GRB 030429: confirmation of afterglow candidate
  30. GRB030429, possible optical counterpart
  31. GRB 030329 Oprical observations in Rozhen observatory
  32. GRB 030429: ROTSE-III observations
  33. GRB 030324: Radio Observations
  34. GRB030329 observed as a sudden ionospheric disturbance (SID)
  35. GRB030329, SPM optical observations (Correction)
  36. GRB030329, SPM optical observations
  37. GRB 030329, the review of the sky area in plate archive (1950-1998)
  38. Optical Observations of GRB 030418 with Magellan
  39. GRB 030329: optical spectropolarimetry at VLT
  40. GRB030329: optical polarization
  41. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  42. MASTER:optical observations GRB030418
  43. MASTER:optical observations probable GRB030414
  44. GRB030329: 444 AAVSO Measurements
  45. MASTER:optical observations GRB030416
  46. ROTSE-III prompt optical detections of GRB 030418
  47. GRB030418: Upper limits from recent and historical observations.
  48. GRB030418: Kiso near infrared observations
  49. GRB 030418: Optical afterglow
  50. GRB 030418: Optical afterglow candidate
  51. GRB030329: Optical Observations
  52. OT GRB 030329: early UBVRcIc spectral evolution
  53. GRB030329, UBVRI polarimetry, R-polarization
  54. GRB 030329: SARA Optical Observations
  55. OT GRB 030329: early spectrum
  56. GRB030329: VR Photometry at TNG
  57. GRB 030413: Optical Observations
  58. GRB 030329 Rc observations
  59. GRB 030329 VLBA Observations
  60. GRB 030329: VLT V-band photometry
  61. GRB030329: RTT150 optical observations
  62. GRB030329: Near Infrared Observations at Gunma
  63. Kiso observation of the GRB030329 at April 6
  64. GRB030329: Optical observcations
  65. GRB030329: BV photographic observations
  66. GRB 030329 Optical observations
  67. GRB030329: RTT150 optical observations
  68. GRB030329: Kiso B and R band observations
  69. GRB030329: RTT150 optical observation
  70. GRB030329: More AAVSO VR obs
  71. GRB030328: R upper limit after 6 hours by MASTER
  72. GRB 030329: BV photographic observations
  73. GRB 030329: SARA Optical Observations
  74. GRB 030329: SARA Optical Observations
  75. GRB030329: Optical observations
  76. SDSS 0.5m PT observations of GRB030329 (correction)
  77. SDSS 0.5m PT observations of GRB030329
  78. GRB 030329, Optical observations
  79. GRB 030329, nearby galaxies
  80. GRB030329: final R-band light curve by MASTER
  81. GRB030329 - more 15 GHz radio data
  82. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  83. GRB 030329: Sub-millimeter detection
  84. GRB 030329: SARA Optical Observations
  85. GRB 030329: SARA Optical Observations
  86. GRB030329: optical observations at Tokyo Tech
  87. GRB 030329: optical observations
  88. GRB 030329, BRI photometry
  89. GRB 030329 , SPM optical observations
  90. GRB030329: Optical observations at Teramo
  91. GRB 030329: Radio observations at GMRT
  92. GRB030329: more 15GHz observations
  93. Further AAVSO V,B,R observations of GRB030329
  94. GRB 030329: Additional Mt. Laguna Optical Observations
  95. GRB 030329: SARA Optical Observations
  96. GRB 030329: Observations with ANDICAM
  97. GRB030329: Optical observations
  98. GRB030329: further optical photometry and evidence for a light curve discontinuity
  99. GRB 030329: Correction to GCN 2056
  100. GRB 030329: KAIT optical photometry

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